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Table 3 Genes expression regulated by saeRS in S. epidermidis

From: Role of the SaeRS two-component regulatory system in Staphylococcus epidermidisautolysis and biofilm formation

Genbank accession no. Genes/ORF Description Expression ratio mutant/WT P-valueb Functions References
    Microarraya RT-qPCR    
Autolysis-related genes    
AAW52842 lytS two-component sensor histidine kinase LytS 3.87 2.33 ± 0.35 0.0097 Negatively modulating the expression of murein hydrolases and positively regulates the expression of the lrgAB operon in S. aureus [27, 43, 44]
AAW52844 lrgA holin-like protein LrgA 2.28 2.75 ± 0.05 < 0.0001 Encoding a murein hydrolase exporter similar to bacteriophage holin proteins; may be required for the activity or transport of this cell wall-associated murein hydrolase in S. aureus [44]
AAW53428 serp0043 1,4-beta-N-acetylmuramidase 4.86 2.25 ± 0.20 0.0016 Having lysozyme activity in peptidoglycan catabolic process in S. aureus [14]
AAW53918 glpQ glycerophosphoryl diester phosphodiesterase GlpQ, putative 2.98 1.80 ± 0.20 0.0080 Having glycerophosphodiester phosphodiesterase activity in lipid and glycerol metabolic process in S. aureus [55]
AAW54343 arlR DNA-binding response regulator 8.30 3.20 ± 0.45 0.0015 Regulating extracellular proteolytic activity; may be involved in the modulation of expression of genes associated with growth and cell division; positively regulating a two-component system lytRS in S. aureus [18, 25, 26, 5658]
AAW53968 atlE S. epidermidis autolysin UDc 1.45 ± 0.10 0.0053 Having amidase activity to cleave the amide bond between N-acetyl muramic acid and L-alanine; mediating lysis of a subpopulation of the bacteria and extracellular DNA release in S. epidermidis [7, 29, 46]
AJ250905 aae S. epidermidis autolysin/adhesin UD 2.32 ± 0.38 0.0088 Having bacteriolytic activity and binding to fibrinogen, fibronectin and vitronectin in S. epidermidis [8]
Biofilm-forming related genes    
AAW53175 icaA a gene of ica operon UD 1.22 ± 0.13 0.20 Encoding N-acetyglucosaminyltransferase for synthesis of polysaccharide intercellular adhesin (PIA) which is important for biofilm formation of S. epidermidis [2, 31, 59]
AAW53239 aap accumulation-associated protein UD 1.62 ± 0.06 0.0008 Contributing to intercellular adhesion and biofilm formation of S. epidermidis [4, 60, 61]
sae operon    
AAW53762 saeS sensor histidine kinase SaeS 0.26 UD   Encoding a histidine kinase; involving in the tight temporal control of virulence factor expression in S. aureus [18, 47, 62]
AAW53763 saeR DNA-binding response regulator SaeR 0.14 UD   The response regulator SaeR binding to a direct repeat sequence in S. aureus; involving in anaerobic growth and nitrate utilization in S. epidermidis [11, 48]
AAW53764 saeQ conserved hypothetical protein UD UD   Encoding a membrane protein, function unknown in S. epidermidis [62]
AAW53765 saeP lipoprotein, putative UD UD   Encoding a lipoprotein, function unknown in S. epidermidis [62]
  1. a The complete raw microarray dataset has been posted on the Gene Expression Omnibus database (, accession number GPL13532 for the platform design and GSE29309 for the original dataset.
  2. b P-values of RT-qPCR results were caculated using Student's t-test.
  3. c UD: under detection level in microarray analysis or by RT-qPCR.