Functional role category classification of alternative σ factor dependent proteins. Functional role category classification of σH positively-regulated (blue), σH negatively-regulated (red), σC positively-regulated (green), σC negatively-regulated (purple), σL positively-regulated (turquoise), and σL negatively-regulated (gray) proteins; and proteins with higher levels in L. monocytogenes parent strain 10403S (PAR.) compared to ΔBCHL (yellow) and lower levels in PAR. compared to ΔBCHL (orange). Role category numbers correspond to: (1) Amino acid biosynthesis; (2) Biosynthesis of cofactors, prosthetic groups, and carriers; (3) Cell envelope; (4) Cellular processes; (5) Central intermediary metabolism; (6) Energy metabolism; (7) Fatty acid and phospholipid metabolism; (8) Hypothetical proteins; (9) Protein fate; (10) Protein synthesis; (11) Purines, pyrimidines, nucleosides, and nucleotides; (12) Regulatory functions; (13) Transcription; (14) Transport and binding proteins; (15) Unclassified; (16) Unknown function; (17) Viral functions. One protein may be classified into more than one role category. Statistical analysis of contingency tables for regulons with > 10 proteins (i.e., proteins positively regulated by σH; proteins negatively regulated by σL; proteins with higher or lower levels in the parent strain) found that role categories were not randomly distributed among proteins negatively regulated by σL and proteins with lower levels in the parent strain.
Mujahid et al. BMC Microbiology 2013 13:156 doi:10.1186/1471-2180-13-156