2M4V

Mycobacterium tuberculosis RNA polymerase binding protein A (RbpA) and its interactions with sigma factors


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 35 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mycobacterium tuberculosis RNA polymerase-binding protein A (RbpA) and its interactions with sigma factors.

Bortoluzzi, A.Muskett, F.W.Waters, L.C.Addis, P.W.Rieck, B.Munder, T.Schleier, S.Forti, F.Ghisotti, D.Carr, M.D.O'Hare, H.M.

(2013) J.Biol.Chem. 288: 14438-14450

  • DOI: 10.1074/jbc.M113.459883

  • PubMed Abstract: 
  • RNA polymerase-binding protein A (RbpA), encoded by Rv2050, is specific to the actinomycetes, where it is highly conserved. In the pathogen Mycobacterium tuberculosis, RbpA is essential for growth and survival. RbpA binds to the β subunit of the RNA ...

    RNA polymerase-binding protein A (RbpA), encoded by Rv2050, is specific to the actinomycetes, where it is highly conserved. In the pathogen Mycobacterium tuberculosis, RbpA is essential for growth and survival. RbpA binds to the β subunit of the RNA polymerase where it activates transcription by unknown mechanisms, and it may also influence the response of M. tuberculosis to the current frontline anti-tuberculosis drug rifampicin. Here we report the solution structure of RbpA and identify the principle sigma factor σ(A) and the stress-induced σ(B) as interaction partners. The protein has a central ordered domain with a conserved hydrophobic surface that may be a potential protein interaction site. The N and C termini are highly dynamic and are involved in the interaction with the sigma factors. RbpA forms a tight complex with the N-terminal domain of σ(B) via its N- and C-terminal regions. The interaction with sigma factors may explain how RbpA stabilizes sigma subunit binding to the core RNA polymerase and thereby promotes initiation complex formation. RbpA could therefore influence the competition between principal and alternative sigma factors and hence the transcription profile of the cell.


    Organizational Affiliation

    Department of Biochemistry, University of Leicester, Leicester LE1 9HN, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative uncharacterized protein
A
80Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)N/A
Find proteins for O53492 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  O53492
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 35 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2M4V Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-05-08
    Type: Database references
  • Version 1.2: 2013-08-07
    Type: Database references