Microarray analysis of the transcriptional responses of Porphyromonas gingivalis to polyphosphate

BMC Microbiology

Table 1 Differentially expressed genes related to iron/hemin aquisition and oxidative stress

Locus no.^a	Putative identification^a	Cellular role^a	Avg fold difference^b
PG1551	hmuY protein	Transport and binding proteins: Cations and iron carrying compounds	−1.19^c
PG1552	TonB-dependent receptor HmuR	Transport and binding proteins: Cations and iron carrying compounds	−2.28
PG1553	HmuS^d	Hemin acquisition^d	−2.77
PG1554	HmuT^d	Hemin acquisition^d	−3.44
PG1555	HmuU^d	Hemin acquisition^d	−3.29
PG1556	HmuV^d	Hemin acquisition^d	−2.15
PG1729	thiol peroxidase	Cellular processes : Detoxification	3.12
PG1421	Ferredoxin, 4Fe-4S	Energy metabolism : Electron transport	28.54
PG0195	Rubrerythrin	Energy metabolism : Electron transport	15.49
PG0034	Thioredoxin	Energy metabolism : Electron transport	2.76
PG1286	Ferritin	Transport and binding proteins:	2.59
PG1286	Ferritin	Cations and iron carrying compounds	2.59
PG0090	Dps family protein	Cellular processes:	2.45
PG0090	Dps family protein	Adaptations to atypical conditions	2.45
PG1545	Superoxide dismutase, Fe-Mn	Cellular processes : Detoxification	2.34
PG1089	DNA-binding response regulator RprY	Regulatory functions : DNA interactions	2.00
PG1089	DNA-binding response regulator RprY	Signal transduction: Two-component systems	2.00
PG0593	htrA protein heat induced serine protease	Protein fate: Degradation of proteins, peptides, and glycopeptides	4.20

^aLocus number, putative identification, and cellular role are according to the TIGR genome database.
^bAverage fold difference indicates the expression of the gene by polyP addition versus no polyP addition.
^cThe cut off ratio for the fold difference was < 1.5.
^dPutative identification and cellular role are according to Lewis [24].

ISSN: 1471-2180