1STZ

Crystal structure of a hypothetical protein at 2.2 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of a heat-inducible transcriptional repressor HrcA from Thermotoga maritima: structural insight into DNA binding and dimerization.

Liu, J.Huang, C.Shin, D.H.Yokota, H.Jancarik, J.Kim, J.S.Adams, P.D.Kim, R.Kim, S.H.

(2005) J.Mol.Biol. 350: 987-996

  • DOI: 10.1016/j.jmb.2005.04.021

  • PubMed Abstract: 
  • All cells have a defense mechanism against a sudden heat-shock stress. Commonly, they express a set of proteins that protect cellular proteins from being denatured by heat. Among them, GroE and DnaK chaperones are representative defending systems, an ...

    All cells have a defense mechanism against a sudden heat-shock stress. Commonly, they express a set of proteins that protect cellular proteins from being denatured by heat. Among them, GroE and DnaK chaperones are representative defending systems, and their transcription is regulated by a heat-shock repressor protein HrcA. HrcA repressor controls the transcription of groE and dnaK operons by binding the palindromic CIRCE element, presumably as a dimer, and the activity of HrcA repressor is modulated by GroE chaperones. Here, we report the first crystal structure of a heat-inducible transcriptional repressor, HrcA, from Thermotoga maritima at 2.2A resolution. The Tm_HrcA protein crystallizes as a dimer. The monomer is composed of three domains: an N-terminal winged helix-turn-helix domain (WH), a GAF-like domain, and an inserted dimerizing domain (IDD). The IDD shows a unique structural fold with an anti-parallel beta-sheet composed of three beta-strands sided by four alpha-helices. The Tm_HrcA dimer structure is formed through hydrophobic contact between the IDDs and a limited contact that involves conserved residues between the GAF-like domains. In the overall dimer structure, the two WH domains are exposed, but the conformation of these two domains seems to be incompatible with DNA binding. We suggest that our structure may represent an inactive form of the HrcA repressor. Structural implication on how the inactive form of HrcA may be converted to the active form by GroEL binding to a conserved C-terminal sequence region of HrcA is discussed.


    Organizational Affiliation

    Berkeley Structural Genomics Center, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat-inducible transcription repressor hrcA homolog
A, B, C
338Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: hrcA
Find proteins for Q9WZV5 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9WZV5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 115.295α = 90.00
b = 115.295β = 90.00
c = 185.148γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXphasing
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-24
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description