2M6O

The actinobacterial transcription factor RbpA binds to the principal sigma subunit of RNA polymerase


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The actinobacterial transcription factor RbpA binds to the principal sigma subunit of RNA polymerase.

Tabib-Salazar, A.Liu, B.Doughty, P.Lewis, R.A.Ghosh, S.Parsy, M.L.Simpson, P.J.O'Dwyer, K.Matthews, S.J.Paget, M.S.

(2013) Nucleic Acids Res 41: 5679-5691

  • DOI: 10.1093/nar/gkt277
  • Primary Citation of Related Structures:  
    2M6O, 2M6P

  • PubMed Abstract: 
  • RbpA is a small non-DNA-binding transcription factor that associates with RNA polymerase holoenzyme and stimulates transcription in actinobacteria, including Streptomyces coelicolor and Mycobacterium tuberculosis. RbpA seems to show specificity for the vegetative form of RNA polymerase as opposed to alternative forms of the enzyme ...

    RbpA is a small non-DNA-binding transcription factor that associates with RNA polymerase holoenzyme and stimulates transcription in actinobacteria, including Streptomyces coelicolor and Mycobacterium tuberculosis. RbpA seems to show specificity for the vegetative form of RNA polymerase as opposed to alternative forms of the enzyme. Here, we explain the basis of this specificity by showing that RbpA binds directly to the principal σ subunit in these organisms, but not to more diverged alternative σ factors. Nuclear magnetic resonance spectroscopy revealed that, although differing in their requirement for structural zinc, the RbpA orthologues from S. coelicolor and M. tuberculosis share a common structural core domain, with extensive, apparently disordered, N- and C-terminal regions. The RbpA-σ interaction is mediated by the C-terminal region of RbpA and σ domain 2, and S. coelicolor RbpA mutants that are defective in binding σ are unable to stimulate transcription in vitro and are inactive in vivo. Given that RbpA is essential in M. tuberculosis and critical for growth in S. coelicolor, these data support a model in which RbpA plays a key role in the σ cycle in actinobacteria.


    Organizational Affiliation

    School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized proteinA48Streptomyces coelicolor A3(2)Mutation(s): 0 
Gene Names: SCO1421rbpA
UniProt
Find proteins for Q9RKY0 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q9RKY0 
Go to UniProtKB:  Q9RKY0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9RKY0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-06-26
    Changes: Database references
  • Version 1.2: 2013-07-03
    Changes: Database references
  • Version 1.3: 2018-01-24
    Changes: Structure summary