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virulence, detoxification, adaptation
information pathways
cell wall and cell processes
stable RNAs
insertion seqs and phages
PE/PPE
intermediary metabolism and respiration
unknown
regulatory proteins
conserved hypotheticals
lipid metabolism
pseudogenes
General annotation
TypeCDS
FunctionThe sigma factor is an initiation factor that promotes attachment of the RNA polymerase to specific initiation sites and then is released. May control the regulons of stationary phase and general stress resistance. Seems to be regulated by sigh (Rv3223c product) and SIGE (Rv1221 product). Seems to regulate KATG|Rv1908c and the heat-shock response.
ProductRNA polymerase sigma factor SigB
CommentsRv2710, (MTCY05A6.31), len: 323 aa. SigB (formerly known as mysB), RNA polymerase sigma factor (see citations below), equivalent to Q59531|ML1014 RNA polymerase sigma factor from Mycobacterium leprae (319 aa), FASTA scores: opt: 1935, E(): 1.9e-109, (96.2% identity in 316 aa overlap). Also highly similar to others e.g. Q59553|MYSB from Mycobacterium smegmatis (319 aa), FASTA scores: opt: 1874, E(): 9.1e-106, (92.4% identity in 316 aa overlap); Q9ANT6|SIGB from Brevibacterium flavum (331 aa), FASTA scores: opt: 1525, E(): 9.9e-85, (78.9% identity in 303 aa overlap); Q60158|RPOV from Mycobacterium bovis (528 aa), FASTA scores: opt: 1246, E(): 9.3e-68, (62.85% identity in 315 aa overlap); etc. Contains sigma-70 factors family signatures 1 and 2 (PS00715 and PS00716). And contains possible helix-turn-helix motif at aa 282-303 (Score 1887, +5.61 SD). Belongs to the sigma-70 factor family.
Functional categoryInformation pathways
ProteomicsIdentified in the cytosol and cell membrane fraction of M. tuberculosis H37Rv using 2DLC/MS (See Mawuenyega et al., 2005). Identified by mass spectrometry in Triton X-114 extracts of M. tuberculosis H37Rv (See Malen et al., 2010). Identified by mass spectrometry in the membrane protein fraction of M. tuberculosis H37Rv but not the culture filtrate or membrane protein fraction (See de Souza et al., 2011).
TranscriptomicsmRNA identified by SCOTS method, during infection of cultured human primary macrophages (see Graham & Clark-Curtiss 1999). mRNA also identified by real-time quantitative RT-PCR during exponential growing cultures. mRNA level increased under stress conditions (0.05% SDS) and after heat shock (see Manganelli et al., 1999; Stewart et al., 2002). mRNA also identified by RT-PCR in stationary-phase and persistent bacteria (see Hu et al., 2000). DNA microarrays and qRT-PCR indicate regulation by MprA (See He et al., 2006).
MutantEssential gene for in vitro growth of H37Rv in a MtbYM rich medium, by Himar1 transposon mutagenesis (see Minato et al. 2019). Non-essential gene for in vitro growth of H37Rv, by analysis of saturated Himar1 transposon libraries (see DeJesus et al. 2017). Essential gene by Himar1 transposon mutagenesis in H37Rv strain (see Sassetti et al., 2003). Non-essential gene for in vitro growth of H37Rv, but essential for in vitro growth on cholesterol; by sequencing of Himar1-based transposon mutagenesis (See Griffin et al., 2011).
Check for mutants available at TARGET website
Coordinates
TypeStartEndOrientation
CDS30224613023432+
Genomic sequence
Feature type Upstream flanking region (bp) Downstream flanking region (bp) Update
       
Protein sequence
>Mycobacterium tuberculosis H37Rv|Rv2710|sigB
MADAPTRATTSRVDSDLDAQSPAADLVRVYLNGIGKTALLNAAGEVELAKRIEAGLYAEHLLETRKRLGENRKRDLAAVVRDGEAARRHLLEANLRLVVSLAKRYTGRGMPLLDLIQEGNLGLIRAMEKFDYTKGFKFSTYATWWIRQAITRGMADQSRTIRLPVHLVEQVNKLARIKREMHQHLGREATDEELAAESGIPIDKINDLLEHSRDPVSLDMPVGSEEEAPLGDFIEDAEAMSAENAVIAELLHTDIRSVLATLDEREHQVIRLRFGLDDGQPRTLDQIGKLFGLSRERVRQIERDVMSKLRHGERADRLRSYAS
      
Bibliography