2FBK

The Crystal Structure of HucR from Deinococcus radiodurans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Crystal Structure of the Transcriptional Regulator HucR from Deinococcus radiodurans Reveals a Repressor Preconfigured for DNA Binding.

Bordelon, T.Wilkinson, S.P.Grove, A.Newcomer, M.E.

(2006) J.Mol.Biol. 360: 168-177

  • DOI: 10.1016/j.jmb.2006.05.005

  • PubMed Abstract: 
  • We report here the 2.3 A resolution structure of the hypothetical uricase regulator (HucR) from Deinococcus radiodurans R1. HucR, a member of the MarR family of DNA-binding proteins, was previously shown to repress its own expression as well as that ...

    We report here the 2.3 A resolution structure of the hypothetical uricase regulator (HucR) from Deinococcus radiodurans R1. HucR, a member of the MarR family of DNA-binding proteins, was previously shown to repress its own expression as well as that of a uricase, a repression that is alleviated both in vivo and in vitro upon binding uric acid, the substrate for uricase. As uric acid is a potent scavenger of reactive oxygen species, and as D. radiodurans is known for its remarkable resistance to DNA-damaging agents, these observations indicate a novel oxidative stress response mechanism. The crystal structure of HucR in the absence of ligand or DNA reveals a dimer in which the DNA recognition helices are preconfigured for DNA binding. This configuration of DNA-binding domains is achieved through an apparently stable dimer interface that, in contrast to what is observed in other MarR homologs for which structures have been determined, shows little conformational heterogeneity in the absence of ligand. An additional amino-terminal segment, absent from other MarR homologs, appears to brace the principal helix of the dimerization interface. However, although HucR is preconfigured for DNA binding, the presence of a stacked pair of symmetry-related histidine residues at a central pivot point in the dimer interface suggests a mechanism for a conformational change to attenuate DNA binding.


    Organizational Affiliation

    Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
transcriptional regulator, MarR family
A, B
181Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422)Mutation(s): 0 
Find proteins for Q9RV71 (Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422))
Go to UniProtKB:  Q9RV71
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.239 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 44.991α = 90.00
b = 44.991β = 90.00
c = 284.500γ = 120.00
Software Package:
Software NamePurpose
CNSphasing
PDB_EXTRACTdata extraction
DENZOdata reduction
HKL-2000data reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-07-04
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description