- Research article
- Open Access
The C3HC type zinc-finger protein (ZFC3) interacting with Lon/MAP1 is important for mitochondrial gene regulation, infection hypha development and longevity of Magnaporthe oryzae
BMC Microbiology volume 20, Article number: 23 (2020)
The rice blast is a typical fungal disease caused by Magnaporthe oryzae, and the mitochondrial ATP-dependent Lon protease (MAP1) has been proven to be involved in blast development. We previously screened a C3HC type Zinc-finger domain protein (ZFC3), which is interacted with MAP1. The purpose of this research was to study the biological function of ZFC3 protein in M. oryzae.
We first confirmed that the ZFC3-RFP fusion protein is localized within the mitochondria. The deleted mutant strains of ZFC3 (∆ZFC3) showed the enhanced expression level of mtATP6, particularly mtATP8, and almost unchanged nATP9. ΔZFC3 produces more conidia and more tolerance to multiple stressors. The knock-out strain shows more melanin accumulation suggests the susceptibility to aging. ΔZFC3 displays faster early-stage hypha infiltration involved in MAP1-mediated pathogenicity in host rice.
These results support the view that ZFC3 is a key regulator involved in gene regulation, stress response, cell wall integrity, longevity, conidiation, infection hypha development and MAP1-mediated pathogenicity in M. oryzae.
Magnaporthe oryzae is the best-studied phytopathogenic fungus, which can cause severe blast disease in rice [1, 2]. The disease can lead to a great loss of the yield of grain production during epidemics . The rice blast fungus has a variety of life cycle pathways. It is better to understand the specific function in each pathway, to provide biological evidence in eukaryotic development and pathogenesis with feasible molecular genetic manipulation methods. Since a large number of genes have been well investigated in this pathogen, they supply potential targets for rice blast disease control [4,5,6].
Transcription factors (TFs) are proteins that bind to specific DNA sequences, which can control the rate of transcription from DNA to mRNA [7, 8]. TFs turn genes on or off to ensure that they are expressed in the right cell at the right time. This TF-controlled regulation occurs throughout the life of the cell and the organism [9,10,11]. Many putative TFs that specifically associate nuclear matrix and some other related transcriptional factors have been confirmed to globally affect gene activation and repression in the rice blast fungus, and further functional analyses indicated that several TF genes are important for fungal development, pathogenesis, and environmental stress tolerance. For example, in hyphal growth [12, 13], conidiogenesis [14, 15], plant infection , response to oxidative stress [17, 18] and longevity [19, 20]. However, fungal cytoplasm transcription factors, particularly mitochondrial gene transcription factors are actually unknown in M. oryzae. Therefore, it is necessary to further probe functions of these TFs.
In filamentous fungi, aging research in the early 1950s described that cultures of the filamentous ascomycete Podosprora anserine did not grow indefinitely but senesce after a strain specific period of growth . The vital phenotype is characterized by an age-related decrease in the growth rate of mycelium and an increase in the pigmentation of aging cultures . Here are several factors can affect life span: i. The life span of P. anserina was affected after adding different metabolic inhibitors to the medium .
Kanamycin and neomycin act as inhibitors of mitochondrial ribosomes could lead to an increased life span ; ii. Age-related reorganization of the mitochondrial DNA, nuclear genes and extrachromosomal genetic traits (mitochondrial DNA) can control the onset of senescence [25,26,27]; iii. Mitochondrial oxidative stress and compensation of mitochondrial dysfunctions [28, 29].
Mitochondria are maternally inherited multifunctional organelles, which can form a comprehensive network in many cells to maintain an intricate balance between fission and fusion, mitochondrial biogenesis, and mitophagy [30,31,32]. Somatic mitochondrial DNA (mtDNA) mutations and respiratory chain dysfunction accompany normal aging , and fungal aging and longevity are highly dependent on mitochondrial integrity and functions [34,35,36,37]. Better communication between the nucleus and mitochondria is the basis of different mitochondrial stress signals as well as the nuclear stress response pathways to handle these stressors maintain bioenergetic homeostasis in most cases.
In fungal pathogens, mitochondria play major roles in developmental and morphogenetic switches such as hyphal differentiation and biofilm formation, adaptation to stress, cell wall biosynthesis, and structure, innate immune cell interaction and susceptibility to antifungal drugs [38,39,40,41,42]. Therefore, the mitochondrion is considered a prime target for treating fungal diseases [41, 43].
The ATP-dependent Lon protease is the most highly conserved member of the energy-dependent proteases in a myriad of organisms, which vary across different systems and circumstances . Lon proteases play important biological roles in the cell cycle, differentiation, sporulation, motility, and development during stress [45,46,47,48]. MAP1, a Lon-like protease of fungal phytopathogens, shares common functions in response to environmental stressors with fungal pathogens. For example, MAP1 is involved in cell wall integrity and maintains pathogenicity and development of M. oryzae [49, 50]. The involvement of MAP1 in pathogenesis is through the regulation of specific interacting proteins . Previous research showed that ZFC3 is one of the interacting proteins with MAP1 . The function of nuclear transcription factors have been investigated in mammalian mitochondria and may directly regulate mitochondrial gene expression . There is increasing concern about nuclear transcription factors as a direct regulator of mitochondrial gene expression [52, 53].
In this study, we demonstrate ZFC3 is a TF protein which interacts with MAP1 and localizes to the mitochondria to regulate the relative expression of ATP synthesis genes. ∆ZFC3 knock-out strain is tolerant to stressors and accelerates the aging process of fungi. With the fast infiltration speed in host rice plants, it fails to change the symptoms of the disease. Our findings provide new insights into ZFC3 mediation of the development and metabolism of the fungal pathogen.
The structure of the zfc3 gene in M. oryzae
In different species, the ZFC3 protein contains two conserved domains, namely, the C3HC zinc finger domains and the Rsm1 superfamily domain (Fig. 1a). Based on the conserved amino acid sequence of the M. oryzae ZFC3 protein, C3HC zinc fingers conserved domain is common in different species (M. oryzae, Fusarium oxysporum, Gaeumannomyces graminis, Nectria haematococca and Togninia minima).
The nucleotide sequence of zfc3 gene (MGG_04317) was aligned and compared with several reported sequences of ZFC3 proteins in other species (Additional file 1: Figure S1a). Phylogenetic analyses of ZFC3 within the eukaryotic tree indicated that this protein was closely related to the other fungal proteins (Additional file 1: Figure S1b).
Subcellular localization of ZFC3-RFP protein
ZFC3 subcellular localization was determined with a red fluorescent protein (RFP) fusion strategy, then the binary vector was introduced into the wild-type strain. The obtained mutants were used to investigate the cellular localization of ZFC3-RFP fusion protein. The fusion protein was distributed throughout the mitochondria (Fig. 1b) by confocal laser scanning microscopy examination. Indicating that ZFC3 protein mainly localizes to mitochondria in M. oryzae.
Relative expression of ATP synthesis genes increased
Since the ZFC3 protein localizes to the mitochondria and interacts with the MAP1 protein (Additional file 1: Figure S1c), nuclear and mitochondrial DNA (mtDNA) are thought to be of separate evolutionary origin. Mitochondrial DNA is only a small portion of the DNA and is common in a eukaryotic cell, 15 mtDNA-encoded genes are available in M. oryzae (Additional file 2). It has been reported that mtDNA-encoded genes involved in energy metabolism  in the process of development. Thus, ATP synthesis gene expression was checked by qRT-PCR. Our data demonstrated that expression level of mtATP6 (GenBank: MGG_21007), particularly mtATP8 (GenBank: MGG_21008) maintained an up-regulated level. The target nATP9 (GenBank: MGG_00892) remained unchanged level (Fig. 2) in comparison with WT and complemented ZFC3-C strains. We concluded that ZFC3 involved in ATP synthesis and as a negative regulator of mitochondria.
Oxidative adaptation and cell wall integrity test
To check the response to oxidative stress in M. oryzae, the WT, ΔZFC3 and ZFC3-C strains were cultured on CM agar containing the oxidative-stress regents H2O2 at 28 °C for 10 days. ΔZFC3 mutant strains displayed increased tolerance to oxidative stress (Fig. 3a). Congo Red (CR) and sodium dodecyl sulfate (SDS) are both typical inhibitors against cell wall synthesis [55,56,57], and the cell wall disturbing agent’s CR and SDS were used for the cell wall integrity test. The results demonstrated that after 10 days of incubation, there is no significant difference in the growth of CR treatment (Fig. 3b) among different strains. The WT, ΔZFC3 and ZFC3-C strains also inoculated on CM agar containing the indicated stress-mimetic agent’s SDS, ΔZFC3 mutant strains displayed a significant difference to SDS control treatment (Fig. 3c). These data suggest ZFC3 is involved in oxidative-stress adaptation as well as cell wall integrity in M. oryzae.
The absent of ZFC3 accelerates aging
Since mitochondrial metabolism increased ATP synthesis, the speed of respiration was enhanced. Normally, the fast respiration rate is appropriately proportional to an increase in metabolic rate. The previous study indicated that differences in metabolic rate have an important effect on the adult lifespan . Traditionally the lowest metabolic rates lived longer and reproduced more often . In order to determine the biological function of zfc3 gene on lifespan, the wild-type and mutant strains were also inoculated on CM solid plates and CM liquid medium. The extent of melanin production was observed in both different mediums. ΔZFC3 mutant showed more accumulation of melanin in both different mediums (Fig. 4a and b). The aging process always accompanied by numerous pigmentary changes, e.g., melanin or lipofuscin may increase with time of age . The result is consistent with the conclusion that the accumulation of melanin means the aging of the organism.
Life span analysis among WT, ΔZFC3 and ZFC3-C strains was also carried out based on Geydan et al. and Cui et al. [61, 62]. Each strain was separately inoculated on the edge of 150-mm solid plates and cultured in climate chamber for 20 days, then the explants were inoculated on fresh medium again for the next culture cycle. The growth of the ΔZFC3 strain quit at the10th day of the fouth culture cycle, indicating the life span of fungi was less than 70 days (Fig. 4c). On the contrary, the WT and ZFC3-C strains can grow until the fifth culture cycle. We thus speculated that ZFC3 has a positive effect on fungal lifespan.
Increased the production of conidia
To investigate the role of ZFC3 in the pathogen conidiation and conidial morphogenesis, we inoculated mycelia on the OM medium and SDC medium. The analysis of conidial morphology revealed that there is no significant difference between ΔZFC3 mutant conidia and those of the WT and complemented strains conidia (Fig. 5a). Further analysis of the conidia production, ΔZFC3 mutant revealed an increased number of conidia (2.2 ± 0.02 × 106/mL) in comparison to WT (1.8 ± 0.03 × 106/mL) and ZFC3-C (1.9 ± 0.05 × 106/mL) (Fig. 5b and c). Taken together, our data demonstrate that ZFC3 controls the production of conidia and as a regulator of the pathogen conidiation.
The infection hypha of knock-out strains developed earlier than WT and complemented strains, but symptoms remained unchanged
To comprehensively evaluate the virulence role of ΔZFC3 in M. oryzae. we inoculated intact host rice leaves (compatible cultivar JJ88) and barley cultivar Golden Promise with conidial suspension (4 mL, 5 × 104 spores/mL) by the spraying inoculation method . Lesions caused by the WT and mutant strains were observed at 7 d (rice) and 5 d (barley). The control and ΔZFC3 mutant strains produced obvious lesions on rice as well as barley leaves and displayed the same infection symptom of all strains (Fig. 6a and b).
To elucidate the difference in the process of infection, we performed an infection assay to examine the early infectious hyphae growth on rice leaf sheaths. Infectious hyphae growth was assayed on rice tissues at 12, 24 and 48 hpi post-inoculation using spore suspensions. ΔZFC3 displayed faster infection speed compared to WT and complemented strains (Fig. 6c and d). These results suggested that zfc3 was essential for early penetration and infectious growth in M. oryzae. The production of melanin significantly enhances the virulence of many important human and plant pathogenic fungi, so fungal melanin also plays an important role in disease spreading [64,65,66], thus explaining why ΔZFC3 mutant with more melanin accumulation displayed faster hypha infiltration in host rice.
The rice blast fungus M. oryzae is a typical model between fungal-plant interaction. A large number of important genes have been characterized for functional analysis. They are mostly involved in the process of fungi’s development and physiology. TF protein ZFC3 is an interacting protein of Lon protease. MAP1 is a member of Lon protease involved fungal pathogenesis. In this study, we set out to explore the role of ZFC3 mediated by MAP1 in the development and pathogenicity of the fungus M. oryzae, to provide the evidence of TF roles in Mitochondria.
A large number of ZFC3 orthologs have been characterized in the fungal pathogen. Moreover, many studies have confirmed that ZFC3 can act as mitochondrion protein (Fig. 1b) and play an important role in the fungi’s development and metabolism. Bioinformatics analysis revealed that ZFC3 protein is present in several filamentous fungi, including GgZFC3 (Gaeumannomyces graminis, XP_009223819.1), CoZFC3 (Colletotrichum orbiculare, TDZ25575.1), FgZFC3 (Fusarium oxysporum, EXL95675.1), VmZFC3 (Valsa mali KUI69614.1), BbZFC3 (Beauveria bassiana XP_008599184.1), VdZFC3 (Verticillium dahlia XP_009650679.1). These filamentous fungi share the conserved C3HC zinc finger domains which are a vital part of the genome. To clarify the biological function of ZFC3, we generated gene deletion mutant with the gene homologous recombination method and complemented mutant, as well as the red fluorescent protein-tagged mutant to determine the subcellular location of ZFC3 in M. oryzae. Confocal results showed that ZFC3 localized within the mitochondria. The interacting protein MAP1 was also localized in the mitochondria . A previous study showed that MAP1 was also important in maintaining the healthy lifespan of the filamentous fungus Thermomyces lanuginosus . Thus, we speculate ZFC3 works in conjunction with MAP1 to maintain mitochondrial integrity and functions in fungi. In the ΔZFC3 mutant, the relative expression of ATP-synthesis related genes is up-regulated (Fig. 2). ZFC3 involves the metabolic of organism mediated by bioenergetics and biosynthetic pathways to maintain the function of mitochondria to keep the organism in healthy condition for growth and development.
Mitochondria is a major organelle to generate oxidative stress. Due to its role in converting oxygen and nutrients into adenosine triphosphate (ATP), it is generally reported to be involved in oxidative-stress adaption [33, 49]. The tolerance of M. oryzae increased when the WT and knock-out strains were exposed to different concentrations of H2O2 (Fig. 3a). Additionally, the ΔZFC3 strain was also tolerant to SDS treatment (Fig. 3c) in comparison with WT and complemented strains. These results indicate that ZFC3 has a specific role in dealing with oxidation stress as well as cell wall integrity.
Melanin ranks as one of the important natural pigments, as it is synthesized by members of all biological kingdoms. It is normal in a variety of species, such as fungi, bacteria, and helminths. Melanin is a sign of aging with the accumulation of pigment. Besides, it has broad contributions to fungal pathogenesis [67,68,69]. Therefore, the increased production of melanin in ΔZFC3 mutant (Fig. 4a and b) indicates the accelerated aging and the enhanced early stage of pathogenicity in M. oryzae.
For pathogen inoculation experiments, we observed that the ΔZFC3 mutant exhibited the same symptom of the infection leaves. It did not change the virulence of M. oryzae, but the increased amount of the conidia production (Fig. 6a and b) and the fast hypha infection rate (Fig. 6c and d) are different from the WT and complemented strains. The increased ATP synthesis suggests a high energy consumption for hypha infiltration. Higher metabolic rates increased free radical formation, which in turn may accelerate aging and lead to early mortality [70, 71]. ΔZFC3 mutant exhibited enhanced development phenotypes, such as increased hyphal growth rates and conidium production (Fig. 5b and c). Indicating that zfc3 is involved in the regulation of conidiation and infection-related development. It also highlights the importance of the transcription factors for pathogenicity [12, 18].
We further will clarify the function and regulation mechanisms of the zinc-finger protein, to confirm the transcription activity of ZFC3 protein and to identify the promoter or non-specific mtDNA sequences, and mtRNA sequences by ChIP and RIP (RNA-IP) approaches. These may constitute a research direction to reveal the mysterious veil of this transcription factor.
In short, this study provides many new insights into ZFC3 on the regulation of asexual development, growth, conidiation, pathogenicity, and especially aging in M. oryzae. Moreover, this study establishes a solid basis in M. oryzae to further explore the specific mitochondrial metabolism process as regulated by ZFC3.
Strains and culture conditions
The M. oryzae JL0910 strain used as the wild-type (WT) was isolated and purified from Oryza sativa cultivar Jijing88 (a widely planted variety in Jilin Province, China), the spring barley (Hordeum vulgare L.) cv. Golden Promise was used in the experiment, the rice and barley plants were grown in a climate chamber under 16 h light photoperiod (240 μmol m− 2 s− 1 photon flux density) at 18 °C/14 °C (day/night). All fungal strains were kept on paper filters at − 20 °C in our lab. An oatmeal agar medium (OM, 4% (w/v) oatmeal, 2.0% (w/v) agar) and corn agar media (SDC: 100 g of straw, 40 g of corn powder, 15 g of agar in 1 L of distilled water) at 25 °C under bright light [63, 72] was used for sporulation analysis and conidia harvesting, genomic DNA isolation, transformation, measurements of vegetative growth rate and conidiation as described . For testing sensitivities to various stresses, fungal growth was determined after culturing at 22 °C on complete medium (CM:10 g/L glucose, 2 g/L peptone, 1 g/L yeast extract, 1 g/L casamino acids, 0.1% (V/V) trace elements, 0.1% (V/V) vitamin supplement, 0.5 g/L MgSO4, 6 g/L NaNO3, 0.5 g/L KCl, 1.5 g/L KH2PO4, pH 6.5) plates. Each test was repeated three times.
Nucleic acid manipulation
For generating the zfc3 gene replacement construct pXEH20, the upstream and downstream fragments of the zfc3 gene were respectively amplified with primers CL-S/CL-A and CR-S / CR-A (Additional file 3). The resulting PCR products were cloned into the XhoI - EcoRI and BamHI - HindIII sites of vector pXEH20. The knockout vector was introduced into Agrobacterium tumefaciens strain AGL-1 and then do transformation with M. oryzae JL0910 by the ATMT method as described , Transformants cultured in hygromycin at 200 μg/mL were screened, then they were identified by PCR with primers HYG-F/HYG-R (Additional file 3). To generate complemented vector, a fragment containing 1800 bp upstream of the coding region of zfc3 was amplified by PCR with primers pZFC3-S/pZFC3-A (Additional file 3) and cloned into vector pCB1532 . The complementary vector was transformed into A. tumefaciens strain AGL-1 and the resultant transformants generated by the ATMT method were screened on chlorimuron-ethyl containing DCM medium. Selected transformants were determined by diagnostic PCR to confirm the integration cases, so ZFC3-C mutant strains were also taken as control.
RT-PCR and qRT-PCR analysis
Total RNAs were isolated from mycelia harvested from 2-day-old CM media with TRIzol reagent (Invitrogen) and purified with the DNA-free kit (Ambion). The first-strand cDNA was synthesized from one microgram of total RNA using the Improm II RT-PCR kit (Promega, Madison, WI). The designed PCR and RT-PCR primers (Additional file 3) were used for amplifying the full length of zfc3 DNA and cDNA from reverse transcription. The ABI Prism 7500 Sequence Detection System (Applied Biosystems) and SYBR® premix EX taq™ II (TliRNaseH Plus) Kit (Takara, Dalian, China) were used for qRT-PCR analysis with primers (Additional file 3). The M. oryzae actin gene (MGG_03982.6) was taken as a reference gene for normalization.
Generation of gene fluorescent fusion sub-cellular localization mutants
The pKD7 plasmid vector (a kind gift from Dr. Wang Hongkai and Dr. Jianping Lu, Zhejiang University, China) including DsRed gene was applied for transformation. The localized fragments, which contained the entire targeted gene was amplified by PCR with primers (DSRED-F/DSRED-R) (Additional file 3) and integrated into pKD7 vector. The localized vector was introduced into A. tumefaciens strain AGL-1 and then do transformation with M. oryzae JL0910 by the ATMT method . Transformants cultured in G418 at 200 μg/mL were screened. To detect mutants by PCR with primers NEO-pl/NEO-p2 (Additional file 3).
Lifespan test was based on the method of [61, 62] with suitable optimization. In a word, lifespan was determined in time (days) and in length (cm) of continuous growth on Petri dishes (150 mm × 25 mm) filled with 65 mL CM medium. Each experiment was carried out at least two replications. The stains were incubated under an angle of 30°–45° and to record the growth every 2 days. Explants were transferred to fresh medium for further measurement form the edge of over-grown Petri dishes. The observation was done until the growth rate declined significantly. They were classified as non-senescent when the growth rate did not slow down and when there were no morphological changes. Fast senescing cultures displayed a decline in the growth rate and morphological changes and accompanied by a cessation of growth.
Sporulation formation, rice sheath penetration assays and plant infection assays
Quantitative measurement of condition was assayed on OM medium and SDC medium, while the aerial hyphal and conidial development was monitored as described previously .
Plant infection assays were performed on 4-week-old rice seedlings (Oryza sativa cv. JJ88) and barley cultivar Golden Promise by spraying 4 mL of the conidial suspensions (5 × 104 conidia/mL in 0.2% gelatin). Inoculated plants were placed in a moist chamber at 28 °C for the first 24 h in darkness, and then placed in another moist chamber with a photoperiod of 12 h under the light. The disease severity was assessed after inoculation.
Conidial suspensions were injected into seedling leaf sheaths by a 1-mL syringe, 100 μL of conidial suspension (5 × 104 spores/mL) on the inner leaf sheath cuticle cells. and the inoculated plants were placed in a moist chamber. Lesion formation and necrosis around the inoculation sites were examined when the injection-wounded leaves unfolded at different time points after injection. Mean IH growth rates and movement to adjacent cells at 12, 24 and 48 hpi were determined from 50 appressoria per treatment, repeated in triplicate, as previously described .
Live-cell imaging was performed as described previously using 3 cm-long leaf sheaths segments from around 3-week-old rice plants and injecting one end of the sheath with a spore suspension of 1 × 105 spores/mL in 0.2% gelatin. At the indicated time points, leaf sheaths were trimmed and observed using a Nikon Eclipse 80i microscope.
In order to examine the subcellular localization of the ZFC3 protein, subcellular localization mutants were cultured with CM medium and the hypha was harvested 5 days later. The hyphae were washed 3 times with ddH2O and placed in100 nM Mito-green solution for 30 min. Mito-Green (Invitrogen, Ltd., Paisley, United Kingdom) is a carbocyanine-based and mitochondrion-selective green fluorescence regent, which can be used for staining and tracking the presence of mitochondrion location under the 488 nm laser wavelength with Olympus Xa21 microscope (Olympus, Tokyo, Japan).
All experiments were performed three times. The means ± SD of the growth rate and relative expression were decided using SPSS statistics 22 software, P < 0.05 was considered statistically significant. Error bars mean standard deviation.
Availability of data and materials
All data generated and/or analyzed during the current study are included in this published article (and in its supplementary files). The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
ATP-dependent Lon protease
- OM medium:
Quantitative reverse transcription polymerase chain reaction
- SDC medium:
Straw decoction and corn powder medium
C3HC type Zinc-Finger Protein
Kadotani N, Nakayashiki H, Tosa Y, Mayama S. RNA silencing in the phytopathogenic fungus Magnaporthe oryzae. Mol Plant-Microbe Interact. 2003;16(9):769–76.
Dean R, Van Kan JA, Pretorius ZA, Hammond-Kosack KE, Di Pietro A, Spanu PD, Rudd JJ, Dickman M, Kahmann R, Ellis J, et al. The top 10 fungal pathogens in molecular plant pathology. Mol Plant Pathol. 2012;13(4):414–30.
Oerke EC: Rice blast disease: Edited by R. S. Zeigler, S. A. Leong and P. S. Teng. CAB International, Wallingford, UK, in association with the International Rice Research Institute, Los Baños, 1994. 626 pp. Price: US$135 (hardback). ISBN 0 85198 935 7. Agricultural Systems 1996, 51(3):367–369.
Talbot NJ. On the trail of a cereal killer: exploring the biology of Magnaporthe grisea. Annu Rev Microbiol. 2003;57:177–202.
Khush GS, Jena KK. Current Status and Future Prospects for Research on Blast Resistance in Rice (Oryza sativa L.). In: Advances in Genetics, Genomics and Control of Rice Blast Disease. Dordrecht: Springer; 2009: p. 1–10.
Jeon J, Choi J, Park J, Lee Y-H. Functional genomics in the rice blast fungus to unravel the fungal pathogenicity. J Zhejiang Univ Sci B. 2008;9(10):747–52.
Karin M. Too many transcription factors: positive and negative interactions. New Biol. 1990;2(2):126–31.
Latchman DS. Transcription factors: an overview. Int J Biochem Cell Biol. 1997;29(12):1305–12.
Lee TI, Young RA. Transcription of eukaryotic protein-coding genes. Annu Rev Genet. 2000;34:77–137.
Li B, Carey M, Workman JL. The role of chromatin during transcription. Cell. 2007;128(4):707–19.
Yin WB, Reinke AW, Szilagyi M, Emri T, Chiang YM, Keating AE, Pocsi I, Wang CC, Keller NP. bZIP transcription factors affecting secondary metabolism, sexual development and stress responses in Aspergillus nidulans. Microbiology (Reading, England). 2013;159(Pt 1):77–88.
Kim S, Park S-Y, Kim KS, Rho H-S, Chi M-H, Choi J, Park J, Kong S, Park J, Goh J, et al. Homeobox transcription factors are required for Conidiation and Appressorium development in the Rice blast fungus Magnaporthe oryzae. PLoS Genet. 2009;5(12):e1000757.
Nishimura M, Fukada J, Moriwaki A, Fujikawa T, Ohashi M, Hibi T, Hayashi N. Mstu1, an APSES transcription factor, is required for Appressorium-mediated infection inMagnaporthe grisea. Biosci Biotechnol Biochem. 2014;73(8):1779–86.
Odenbach D, Breth B, Thines E, Weber RW, Anke H, Foster AJ. The transcription factor Con7p is a central regulator of infection-related morphogenesis in the rice blast fungus Magnaporthe grisea. Mol Microbiol. 2007;64(2):293–307.
Lu J, Cao H, Zhang L, Huang P, Lin F. Systematic analysis of Zn2Cys6 transcription factors required for development and pathogenicity by high-throughput gene knockout in the Rice blast fungus. PLoS Pathog. 2014;10(10):e1004432.
Mehrabi R, Kema GHJ. Genes controlling the infection process of the wheat septoria tritici blotch pathogen Mycosphaerella graminicola (session 3: pathogen genetics and genomics); 2008.
Nuruzzaman M, Sharoni AM, Kikuchi S. Roles of NAC transcription factors in the regulation of biotic and abiotic stress responses in plants. Front Microbiol. 2013;4:248.
Guo M, Chen Y, Du Y, Dong Y, Guo W, Zhai S, Zhang H, Dong S, Zhang Z, Wang Y, et al. The bZIP transcription factor MoAP1 mediates the oxidative stress response and is critical for pathogenicity of the Rice blast fungus Magnaporthe oryzae. PLoS Pathog. 2011;7(2):e1001302.
Tepper RG, Ashraf J, Kaletsky R, Kleemann G, Murphy CT, Bussemaker HJ. PQM-1 complements DAF-16 as a key transcriptional regulator of DAF-2-mediated development and longevity. Cell. 2013;154(3):676–90.
Lin X-X, Sen I, Janssens GE, Zhou X, Fonslow BR, Edgar D, Stroustrup N, Swoboda P, Yates JR, Ruvkun G, et al. DAF-16/FOXO and HLH-30/TFEB function as combinatorial transcription factors to promote stress resistance and longevity. Nat Commun. 2018;9(1):4400.
Rizet G. Multiplicity of genetic mechanisms leading to barring in Podospora anseria. Comptes Rendus Hebdomadaires Des Seances De l’Academie Des Sci. 1953;237(13):666–8.
Osiewacz HD. Genes, mitochondria and aging in filamentous fungi. Ageing Res Rev. 2002;1(3):425–42.
Tudzynski P, Esser K. Chromosomal and extrachromosomal control of senescence in the ascomycete Podospora anserina. Mol Gen Genet MGG. 1979;173(1):71–84.
Tudzynski P, Esser K. Inhibitors of mitochondrial function prevent senescence in the ascomycete Podosprora anserina. Mol Gen Genet. 1977;153(1):111–3.
Esser K, Keller W. Genes inhibiting senescence in the ascomycete Podospora anserina. Mol Gen Genet MGG. 1976;144(1):107–10.
Cummings TG, Cooper CL. A cybernetic framework for studying occupational stress. Hum Relat. 1979;32(5):395–418.
Stahl U, Lemke PA, Tudzynski P, Kück U, Esser K. Evidence for plasmid like DNA in a filamentous fungus, the ascomycete Podospora anserina. Mol Gen Genet MGG. 1978;162(3):341–3.
Borghouts C, Kimpel E, Osiewacz HD. Mitochondrial DNA rearrangements of <em> Podospora anserina </em> are under the control of the nuclear gene grisea. Proc Natl Acad Sci. 1997;94(20):10768–73.
Silar P, Koll F, Rossignol M. Cytosolic ribosomal mutations that abolish accumulation of circular intron in the mitochondria without preventing senescence of Podospora anserina. Genetics. 1997;145(3):697–705.
Chan DC. Fusion and fission: interlinked processes critical for mitochondrial health. Annu Rev Genet. 2012;46:265–87.
Hoitzing H, Johnston IG, Jones NS. What is the function of mitochondrial networks? A theoretical assessment of hypotheses and proposal for future research. BioEssays. 2015;37(6):687–700.
Suarez-Rivero JM, Villanueva-Paz M, de la Cruz-Ojeda P, de la Mata M, Cotan D, Oropesa-Avila M, de Lavera I, Alvarez-Cordoba M, Luzon-Hidalgo R, Sanchez-Alcazar JA. Mitochondrial Dynamics in Mitochondrial Diseases. Diseases. 2016;5:1.
Bratic A, Larsson NG. The role of mitochondria in aging. J Clin Invest. 2013;123(3):951–7.
Osiewacz HD. Mitochondrial quality control in aging and lifespan control of the fungal aging model Podospora anserina. Biochem Soc Trans. 2011;39(5):1488–92.
Osiewacz HD, Scheckhuber CQ. Impact of ROS on ageing of two fungal model systems: Saccharomyces cerevisiae and Podospora anserina. Free Radic Res. 2006;40(12):1350–8.
Ugidos A, Nyström T, Caballero A. Perspectives on the mitochondrial etiology of replicative aging in yeast. Exp Gerontol. 2010;45(7):512–5.
Osiewacz HD, Bernhardt D. Mitochondrial quality control: impact on aging and life span - a mini-review. Gerontology. 2013;59(5):413–20.
Bambach A, Fernandes MP, Ghosh A, Kruppa M, Alex D, Li D, Fonzi WA, Chauhan N, Sun N, Agrellos OA, et al. Goa1p of Candida albicans localizes to the mitochondria during stress and is required for mitochondrial function and virulence. Eukaryot Cell. 2009;8(11):1706–20.
Shingu-Vazquez M, Traven A. Mitochondria and fungal pathogenesis: drug tolerance, virulence, and potential for antifungal therapy. Eukaryot Cell. 2011;10(11):1376–83.
Qu Y, Jelicic B, Pettolino F, Perry A, Lo TL, Hewitt VL, Bantun F, Beilharz TH, Peleg AY, Lithgow T, et al. Mitochondrial sorting and assembly machinery subunit Sam37 in Candida albicans: insight into the roles of mitochondria in fitness, cell wall integrity, and virulence. Eukaryot Cell. 2012;11(4):532–44.
Morales DK, Grahl N, Okegbe C, Dietrich LE, Jacobs NJ, Hogan DA. Control of Candida albicans metabolism and biofilm formation by Pseudomonas aeruginosa phenazines. mBio. 2013;4(1):e00526–12.
Calderone R, Li D, Traven A. System-level impact of mitochondria on fungal virulence: to metabolism and beyond. FEMS Yeast Res. 2015;15(4):fov027.
She X, Zhang L, Chen H, Calderone R, Li D. Cell surface changes in the Candida albicans mitochondrial mutant goa1Delta are associated with reduced recognition by innate immune cells. Cell Microbiol. 2013;15(9):1572–84.
Venkatesh S, Lee J, Singh K, Lee I, Suzuki CK. Multitasking in the mitochondrion by the ATP-dependent Lon protease. Biochim Biophys Acta. 2012;1823(1):56–66.
Su S, Stephens BB, Alexandre G, Farrand SK. Lon protease of the alpha-proteobacterium Agrobacterium tumefaciens is required for normal growth, cellular morphology and full virulence. Microbiology (Reading, England). 2006;152(Pt 4):1197–207.
Lan L, Deng X, Xiao Y, Zhou JM, Tang X. Mutation of Lon protease differentially affects the expression of Pseudomonas syringae type III secretion system genes in rich and minimal media and reduces pathogenicity. Mol Plant-Microbe Interact. 2007;20(6):682–96.
Adam C, Picard M, Dequard-Chablat M, Sellem CH, Hermann-Le Denmat S, Contamine V. Biological roles of the Podospora anserina mitochondrial Lon protease and the importance of its N-domain. PLoS One. 2012;7(5):e38138.
Takeuchi K, Tsuchiya W, Noda N, Suzuki R, Yamazaki T, Haas D. Lon protease negatively affects GacA protein stability and expression of the Gac/Rsm signal transduction pathway in Pseudomonas protegens. Environ Microbiol. 2014;16(8):2538–49.
Li J, Liang X, Wei Y, Liu J, Lin F, Zhang S-H. An ATP-dependent protease homolog ensures basic standards of survival and pathogenicity for Magnaporthe oryzae. Eur J Plant Pathol. 2014;141(4):703–16.
Cui X, Wei Y, Wang YH, Li J, Wong FL, Zheng YJ, Yan H, Liu SS, Liu JL, Jia BL, et al. Proteins interacting with mitochondrial ATP-dependent Lon protease (MAP1) in Magnaporthe oryzae are involved in rice blast disease. Mol Plant Pathol. 2015;16(8):847–59.
Leigh-Brown S, Enriquez JA, Odom DT. Nuclear transcription factors in mammalian mitochondria. Genome Biol. 2010;11(7):215.
Falkenberg M, Larsson NG, Gustafsson CM. DNA replication and transcription in mammalian mitochondria. Annu Rev Biochem. 2007;76:679–99.
Woodson JD, Chory J. Coordination of gene expression between organellar and nuclear genomes. Nat Rev Genet. 2008;9(5):383–95.
Thorslund T, Sunesen M, Bohr VA, Stevnsner T. Repair of 8-oxoG is slower in endogenous nuclear genes than in mitochondrial DNA and is without strand bias. DNA Repair. 2002;1(4):261–73.
Woldringh CL, van Iterson W. Effects of treatment with sodium dodecyl sulfate on the ultrastructure of Escherichia coli. J Bacteriol. 1972;111(3):801–13.
Roncero C, Duran A. Effect of Calcofluor white and Congo red on fungal cell wall morphogenesis: in vivo activation of chitin polymerization. J Bacteriol. 1985;163(3):1180–5.
Bruno VM, Kalachikov S, Subaran R, Nobile CJ, Kyratsous C, Mitchell AP. Control of the C. albicans Cell Wall Damage Response by Transcriptional Regulator Cas5. PLoS Pathog. 2006;2(3):e21.
Askari Seyahooei M, Alphen J, Kraaijeveld K. Metabolic rate affects adult life span independently of developmental rate in parasitoid wasps. Biol J Linn Soc. 2011;103:45–56.
Pettersen Amanda K, White Craig R, Marshall Dustin J. Metabolic rate covaries with fitness and the pace of the life history in the field. Proc R Soc B Biol Sci. 2016;283(1831):20160323.
Porta EA. Pigments in Aging: An Overview. Ann N Y Acad Sci. 2002;959(1):57–65.
Geydan TD, Debets AJ, Verkley GJ, van Diepeningen AD. Correlated evolution of senescence and ephemeral substrate use in the Sordariomycetes. Mol Ecol. 2012;21(11):2816–28.
Cui X, Wei Y, Xie XL, Chen LN, Zhang SH. Mitochondrial and peroxisomal Lon proteases play opposing roles in reproduction and growth but co-function in the normal development, stress resistance and longevity of Thermomyces lanuginosus. Fungal Genet Biol. 2017;103:42–54.
Yang J, Zhao X, Sun J, Kang Z, Ding S, Xu JR, Peng YL. A novel protein Com1 is required for normal conidium morphology and full virulence in Magnaporthe oryzae. Mol Plant-Microbe Interact. 2010;23(1):112–23.
Langfelder K, Streibel M, Jahn B, Haase G, Brakhage AA. Biosynthesis of fungal melanins and their importance for human pathogenic fungi. Fungal Genet Biol. 2003;38(2):143–58.
Howard RJ, Valent B. Breaking and entering: host penetration by the fungal rice blast pathogen Magnaporthe grisea. Annu Rev Microbiol. 1996;50:491–512.
Griffiths SA, Cox RJ, Overdijk EJR, Mesarich CH, Saccomanno B, Lazarus CM, de Wit PJGM, Collemare J. Assignment of a dubious gene cluster to melanin biosynthesis in the tomato fungal pathogen Cladosporium fulvum. PLoS One. 2019;13(12):e0209600.
Gomez BL, Nosanchuk JD. Melanin and fungi. Curr Opin Infect Dis. 2003;16(2):91–6.
Nosanchuk JD, Casadevall A. The contribution of melanin to microbial pathogenesis. Cell Microbiol. 2003;5(4):203–23.
Nosanchuk JD, Casadevall A. Impact of melanin on microbial virulence and clinical resistance to antimicrobial compounds. Antimicrob Agents Chemother. 2006;50(11):3519–28.
Ruggiero C, Metter EJ, Melenovsky V, Cherubini A, Najjar SS, Ble A, Senin U, Longo DL, Ferrucci L. High basal metabolic rate is a risk factor for mortality: the Baltimore longitudinal study of aging. J Gerontol Ser A Biol Med Sci. 2008;63(7):698–706.
Jumpertz R, Hanson RL, Sievers ML, Bennett PH, Nelson RG, Krakoff J. Higher energy expenditure in humans predicts natural mortality. J Clin Endocrinol Metab. 2011;96(6):E972–6.
Xu JR, Hamer JE. MAP kinase and cAMP signaling regulate infection structure formation and pathogenic growth in the rice blast fungus Magnaporthe grisea. Genes Dev. 1996;10(21):2696–706.
Chen XL, Yang J, Peng YL. Large-scale insertional mutagenesis in Magnaporthe oryzae by Agrobacterium tumefaciens-mediated transformation. Methods Mol Biol (Clifton, NJ). 2011;722:213–24.
Rho H-S, Kang S, Lee Y-H. Agrobacterium tumefaciens-mediated transformation of the plant pathogenic fungus, Magnaporthe grisea. Mol Cells (Springer Science & Business Media BV). 2001;12:3.
Lau GW, Hamer JE. Acropetal: a genetic locus required for conidiophore architecture and pathogenicity in the rice blast fungus. Fungal Genet Biol. 1998;24(1–2):228–39.
The authors wish to thank the reviewers for their valuable comments.
The research was financially supported by the Natural Science Foundation of China (grant nos. 31670141, 31671972) and a project of the Ministry of Science and Technology of China (grant no. 2016YFD0300703). The funding bodies play the role in providing funding for research. They don’t have roles in the design of the study,
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Additional file 1: Figure S1. Phylogenetic and structural analysis of ZFC3 and its homologs. (a) Sequence alignment of zfc3 in different species of fungi. (b) The phylogenic tree was drawn using MEGA7. GgZFC3 (Gaeumannomyces graminis, XP_009223819.1), CoZFC3 (Colletotrichum orbiculare, TDZ25575.1), FgZFC3 (Fusarium oxysporum, EXL95675.1), VmZFC3 (Valsa mali KUI69614.1), BbZFC3(Beauveria bassiana XP_008599184.1), VdZFC3(Verticillium dahlia, XP_009650679.1). Phylogenetic tree based on the C3HC zinc fingers domain from different eukaryotic organisms indicating that ZFC3 has a relatively close relationship with the fungi group. (c) Protein-Protein interaction between MAP1 and ZFC3. Yeast two-hybrid analysis of MAP1and ZFC3 interaction. Test: interaction between MAP1 and ZFC3 candidate; CK0: self-activation controls; CK+: positive controls; CK−: negative controls.
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Liu, S., Wei, Y. & Zhang, S. The C3HC type zinc-finger protein (ZFC3) interacting with Lon/MAP1 is important for mitochondrial gene regulation, infection hypha development and longevity of Magnaporthe oryzae. BMC Microbiol 20, 23 (2020). https://doi.org/10.1186/s12866-020-1711-4
- C3HC type zinc-finger protein
- Mitochondrial Lon/MAP1
- Infection hypha development
- Mycelia longevity
- Magnaporthe oryzae