2GWR

Crystal structure of the response regulator protein mtrA from Mycobacterium Tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Domain orientation in the inactive response regulator Mycobacterium tuberculosis MtrA provides a barrier to activation.

Friedland, N.Mack, T.R.Yu, M.Hung, L.W.Terwilliger, T.C.Waldo, G.S.Stock, A.M.

(2007) Biochemistry 46: 6733-6743

  • DOI: https://doi.org/10.1021/bi602546q
  • Primary Citation of Related Structures:  
    2GWR

  • PubMed Abstract: 

    The structure of MtrA, an essential gene product for the human pathogen Mycobacterium tuberculosis, has been solved to a resolution of 2.1 A. MtrA is a member of the OmpR/PhoB family of response regulators and represents the fourth family member for which a structure of the protein in its inactive state has been determined. As is true for all OmpR/PhoB family members, MtrA possesses an N-terminal regulatory domain and a C-terminal winged helix-turn-helix DNA-binding domain, with phosphorylation of the regulatory domain modulating the activity of the protein. In the inactive form of MtrA, these two domains form an extensive interface that is composed of the alpha4-beta5-alpha5 face of the regulatory domain and the C-terminal end of the positioning helix, the trans-activation loop, and the recognition helix of the DNA-binding domain. This domain orientation suggests a mechanism of mutual inhibition by the two domains. Activation of MtrA would require a disruption of this interface to allow the alpha4-beta5-alpha5 face of the regulatory domain to form the intermolecule interactions that are associated with the active state and to allow the recognition helix to interact with DNA. Furthermore, the interface appears to stabilize the inactive conformation of MtrA, potentially reducing the rate of phosphorylation of the N-terminal domain. This combination of effects may form a switch, regulating the activity of MtrA. The domain orientation exhibited by MtrA also provides a rationale for the variation in linker length that is observed within the OmpR/PhoB family of response regulators.


  • Organizational Affiliation

    Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-binding response regulator mtrA238Mycobacterium tuberculosisMutation(s): 0 
Gene Names: MT3344MTCY20B11.21cmtrARv3246c
UniProt
Find proteins for P9WGM7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGM7 
Go to UniProtKB:  P9WGM7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WGM7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.916α = 90
b = 56.598β = 90
c = 135.069γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-05-23
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Advisory, Refinement description
  • Version 1.4: 2024-10-16
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary