POP-OUT | CLOSE
 

RNA polymerase sigma factor SigA - P0A0J0 (SIGA_STAA8)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Number of PDB entries for P0A0J0: 3
 
Function
Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. This sigma factor is the primary sigma factor during exponential growth. (data source: UniProt  )
Subunit structure
Interacts transiently with the RNA polymerase catalytic core formed by RpoA, RpoB, RpoC and RpoZ (2 alpha, 1 beta, 1 beta' and 1 omega subunit) to form the RNA polymerase holoenzyme that can initiate transcription (By similarity). Interacts (via sigma-70 factor domain 4) with the phage G1 protein gp67; this inhibits rRNA synthesis. Interaction with phage G1 protein gp67 does not inhibit transcription in general, but selectively inhibits transcription from promoters that require interaction of the RNA polymerase alpha subunit with DNA sequences upstream of the -35 promoter element. (data source: UniProt  )
Domain
The sigma-70 factor domain-4 contains a helix-turn-helix (H-T-H) motif that mediates interaction with the -35 element in promoter DNA. The domain also mediates interaction with the RNA polymerase subunit RpoA. Interactions between sigma-70 factor domain-4 and anti-sigma factors prevents interaction of sigma factors with the RNA polymerase catalytic core (By similarity). (data source: UniProt  )
UniProtKB:
Species: 
Gene names: sigA plaC rpoD SAOUHSC_01662
Length:
Display Options
Zoom
min
max
Sort by
Color by
 
Legend

The Protein Feature View requires a browser that supports SVG (Scalable Vector Graphics). Mouse over tracks and labels for more information.

Data origin/color codes
The vertical color bar on the left side indicates data provenance.
Data in green originates from UniProtKB  
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  

The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).