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Crystal structure of the protease domain of an ATP-independent heat shock protease HtrA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.228 

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This is version 1.2 of the entry. See complete history. 

Literature

Crystal Structure of the Protease Domain of a Heat-shock Protein HtrA from Thermotoga maritima

Kim, D.Y., Kim, D.R., Ha, S.C., Lokanath, N.K., Lee, C.J., Hwang, H.Y., Kim, K.K.

(2003) J.BIOL.CHEM. 278: 6543-6551

  • DOI: 10.1074/jbc.M208148200

  • PubMed Abstract: 

    • HtrA (high temperature requirement A), a periplasmic heat-shock protein, functions as a molecular chaperone at low temperatures, and its proteolytic activity is turned on at elevated temperatures. To investigate the mechanism of functional switch to ...

    HtrA (high temperature requirement A), a periplasmic heat-shock protein, functions as a molecular chaperone at low temperatures, and its proteolytic activity is turned on at elevated temperatures. To investigate the mechanism of functional switch to protease, we determined the crystal structure of the NH(2)-terminal protease domain (PD) of HtrA from Thermotoga maritima, which was shown to retain both proteolytic and chaperone-like activities. Three subunits of HtrA PD compose a trimer, and multimerization architecture is similar to that found in the crystal structures of intact HtrA hexamer from Escherichia coli and human HtrA2 trimer. HtrA PD shares the same fold with chymotrypsin-like serine proteases, but it contains an additional lid that blocks access the of substrates to the active site. A corresponding lid found in E. coli HtrA is a long loop that also blocks the active site of another subunit. These results suggest that the activation of the proteolytic function of HtrA at elevated temperatures might occur by a conformational change, which includes the opening of the helical lid to expose the active site and subsequent rearrangement of a catalytic triad and an oxyanion hole.

    Organizational Affiliation: 

    Department of Molecular Cell Biology, Center for Molecular Medicine, SBRI, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
heat shock protease HtrA
A, B
239Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Find proteins for Q9WZ41 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9WZ41
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.228 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 120.550α = 90.00
b = 120.550β = 90.00
c = 120.550γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-01
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance