Protein
ECF RNA polymerase sigma factor SigG
Organism
Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh)
Function
Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. Extracytoplasmic function (ECF) sigma factors are held in an inactive form by a cognate anti-sigma factor until released, although no anti-sigma factor is known for this protein. May be involved in host intracellular survival after infection (strains H37Rv and CDC 1551). A role in the SOS response is controversial; it has been seen in strain CDC 1551 (PubMed:18039768) but not in H37Rv (PubMed:21169493).
Similarity
Belongs to the sigma-70 factor family. ECF subfamily.
Sequence
MRTSPMPAKFRSVRVVVITGSVTAAPVRVSETLRRLIDVSVLAENSGREPADERRGDFSAHTEPYRRELLAHCYRMTGSLHDAEDLVQETLLRAWKAYEGFAGKSSLRTWLHRIATNTCLTALEGRRRRPLPTGLGRPSADPSGELVERREVSWLEPLPDVTDDPADPSTIVGNRESVRLAFVAALQHLSPRQRAVLLLRDVLQWKSAEVADAIGTSTVAVNSLLQRARSQLQTVRPSAADRLSAPDSPEAQDLLARYIAAFEAYDIDRLVELFTAEAIWEMPPYTGWYQGAQAIVTLIHQQCPAYSPGDMRLISLIANGQPAAAMYMRAGDVHLPFQLHVLDMAADRVSHVVAFLDTTLFPKFGLPDSL