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Sigma2 domain of RNA polymerase sigma factors superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All alpha proteins [ 46456] (284)
Fold:   Sigma2 domain of RNA polymerase sigma factors [ 88945]
Superfamily:   Sigma2 domain of RNA polymerase sigma factors [ 88946]
Families:   Sigma2 domain of RNA polymerase sigma factors [ 88947] (5)


Superfamily statistics
Genomes (2,674) Uniprot 2018_03 genome PDB chains (SCOP 1.75)
Domains 26,067 282,118 9
Proteins 26,054 282,074 9


Functional annotation
General category Other
Detailed category Unknown function

Document:
Function annotation of SCOP domain superfamilies

Arabidopsis Plant Ontology (AP)

(show details)
AP termFDR (all)SDAP levelAnnotation (direct or inherited)
Plant ANatomical entity (PAN)collective phyllome structure0Least InformativeDirect
Plant ANatomical entity (PAN)shoot axis0Least InformativeDirect
Plant ANatomical entity (PAN)guard cell0Least InformativeDirect
Plant ANatomical entity (PAN)megasporophyll0Least InformativeDirect
Plant ANatomical entity (PAN)portion of meristem tissue0Least InformativeDirect
Plant ANatomical entity (PAN)cardinal part of multi-tissue plant structure0Least InformativeDirect
Plant ANatomical entity (PAN)microsporophyll0Least InformativeDirect
Plant ANatomical entity (PAN)whole plant0Least InformativeDirect
Plant ANatomical entity (PAN)seed0Least InformativeDirect
Plant ANatomical entity (PAN)flower0Least InformativeDirect
Plant ANatomical entity (PAN)leaf0Least InformativeDirect
Plant ANatomical entity (PAN)inflorescence0Least InformativeDirect
Plant ANatomical entity (PAN)cotyledon0Moderately InformativeDirect
Plant ANatomical entity (PAN)inflorescence meristem0Moderately InformativeDirect
Plant structure DEvelopment stage (PDE)C globular stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.10 ten leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)E expanded cotyledon stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.04 four leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.06 six leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.12 twelve leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)F mature embryo stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)D bilateral stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.02 two leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)LP.08 eight leaves visible stage0Least InformativeDirect
Plant structure DEvelopment stage (PDE)4 leaf senescence stage0Least InformativeDirect

Document: AP annotation of SCOP domains

InterPro annotation
Cross references IPR013325 SSF88946 Protein matches
Abstract

The bacterial core RNA polymerase complex, which consists of five subunits, is sufficient for transcription elongation and termination but is unable to initiate transcription. Transcription initiation from promoter elements requires a sixth, dissociable subunit called a sigma factor, which reversibly associates with the core RNA polymerase complex to form a holoenzyme [PubMed3052291]. RNA polymerase recruits alternative sigma factors as a means of switching on specific regulons. Most bacteria express a multiplicity of sigma factors. Two of these factors, Sigma70 (gene rpoD; major sigma factor) and Sigma54 (gene rpoN or ntrA) direct the transcription of a wide variety of genes. The other sigma factors, known as alternative sigma factors, are required for the transcription of specific subsets of genes.

This entry represents region 2 (sigma2 domain) found in several sigma factors, often in conjunction with sigma3 and sigma4 domains . This region is present in Sigma70 [PubMed8858155], Sigma28 (FliA), SigA [PubMed11931761], SigR and RpoE. The sigma2 domain has a conserved 4-helical core, and often a variable insert subdomain.


InterPro database


PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Arabidopsis Plant Ontology (AP) ]

Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.


Alignments of sequences to 6 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.


Browse and view proteins in genomes which have different domain combinations including a Sigma2 domain of RNA polymerase sigma factors domain.


Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.


Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 6 hidden Markov models representing the Sigma2 domain of RNA polymerase sigma factors superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.


Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Arabidopsis Plant Ontology (AP) · Internal database links ]