2OQR

The structure of the response regulator RegX3 from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Structure of a Full-length Response Regulator from Mycobacterium tuberculosis in a Stabilized Three-dimensional Domain-swapped, Activated State.

King-Scott, J.Nowak, E.Mylonas, E.Panjikar, S.Roessle, M.Svergun, D.I.Tucker, P.A.

(2007) J.Biol.Chem. 282: 37717-37729

  • DOI: 10.1074/jbc.M705081200

  • PubMed Abstract: 
  • The full-length, two-domain response regulator RegX3 from Mycobacterium tuberculosis is a dimer stabilized by three-dimensional domain swapping. Dimerization is known to occur in the OmpR/PhoB subfamily of response regulators upon activation but has ...

    The full-length, two-domain response regulator RegX3 from Mycobacterium tuberculosis is a dimer stabilized by three-dimensional domain swapping. Dimerization is known to occur in the OmpR/PhoB subfamily of response regulators upon activation but has previously only been structurally characterized for isolated receiver domains. The RegX3 dimer has a bipartite intermolecular interface, which buries 2357 A(2) per monomer. The two parts of the interface are between the two receiver domains (dimerization interface) and between a composite receiver domain and the effector domain of the second molecule (interdomain interface). The structure provides support for the importance of threonine and tyrosine residues in the signal transduction mechanism. These residues occur in an active-like conformation stabilized by lanthanum ions. In solution, RegX3 exists as both a monomer and a dimer in a concentration-dependent equilibrium. The dimer in solution differs from the active form observed in the crystal, resembling instead the model of the inactive full-length response regulator PhoB.


    Organizational Affiliation

    EMBL-Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603, Hamburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sensory transduction protein regX3
A
230Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Gene Names: regX3
Find proteins for P9WGL9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WGL9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LA
Query on LA

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Download CCD File 
A
LANTHANUM (III) ION
La
CZMAIROVPAYCMU-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
BME
Query on BME

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Download CCD File 
A
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.177 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 124.351α = 90.00
b = 124.351β = 90.00
c = 44.824γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
Auto-Rickshawphasing
REFMACrefinement
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-02-01 
  • Released Date: 2007-10-16 
  • Deposition Author(s): King-Scott, J.

Revision History 

  • Version 1.0: 2007-10-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description