Search Ontology:
GO: Molecular Function

sigma factor activity

Term ID
GO:0016987
Synonyms
  • bacterial sigma factor activity
  • core DNA-dependent RNA polymerase binding promoter specificity activity
  • DNA-dependent RNA polymerase promoter selection factor
  • plastid sigma factor activity
  • promoter selection factor activity
  • sigma transcription factor
Definition
Sigma factors act as the promoter specificity subunit of eubacterial and plant plastid multisubunit RNA polymerases, whose core subunit composition is often described as alpha(2)-beta-beta-prime. Although sigma does not bind DNA on its own, when combined with the core to form the holoenzyme, the sigma factor binds specifically to promoter elements. The sigma subunit is released once elongation begins.
References
Ontology
GO: Molecular Function    QuickGO    AmiGO
Relationships
is part of
is a type of
has_part
Phenotype
Phenotype caused by Genes