Protein Family Models

Region 4 of sigma-70 like sigma-factors are involved in binding to the -35 promoter element via a helix-turn-helix motif [1]. [1]. 11931761. Structure of the bacterial RNA polymerase promoter specificity. sigma subunit.. Campbell EA, Muzzin O, Chlenov M, Sun JL, Olson CA, Weinman O,. Trester-Zedlitz ML, Darst SA;. Mol Cell 2002;9:527-539. (from Pfam)

Date:

2024-08-14

This HMM hits a core region shared by multiple sigma factors, interchangeable subunits that complete the RNA polymerase holoenzyme and allow transcription to start. In E. coli K-12 alone, this HMM hits RpoD (sigma-70), RpoH (sigma-32), FliA (sigma-28), FecI (sigma-19), RpoS, and RpoE.

Date:

2024-08-14

sigma-70 family RNA polymerase sigma factor such as RNA polymerase sporulation sigma factor SigH, which is involved in the transition to post-exponential phase in the beginning of sporulation and is also required for the transcription of several stationary phase genes

Date:

2019-07-12

This model encompasses all varieties of the sigma-70 type sigma factors including the ECF subfamily. A number of sigma factors have names with a different number than 70 (i.e. sigma-38), but in fact, all except for the Sigma-54 family (TIGR02395) are included within this family. Several PFAM models hit segments of these sequences including Sigma-70 region 2 (PF04542) and Sigma-70, region 4 (PF04545), but not always above their respective trusted cutoffs.

Date:

2024-06-27

Members of this protein family are RNA polymerase sigma-H factor for sporulation in endospore-forming bacteria. This protein is also called Sigma-30 and SigH. Although rather close homologs in Listeria score above the noise cutoff to this HMM, Listeria does not form spores and the role of the related sigma factor in that genus is in doubt.

Gene:

sigH

Date:

2024-05-16

Gene:

sigH

Date:

2021-10-18

Date:

2021-03-12

Gene:

sigH

Date:

2020-10-26