1MTP

The X-ray crystal structure of a serpin from a thermophilic prokaryote


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The 1.5 A crystal structure of a prokaryote serpin: controlling conformational change in a heated environment

Irving, J.A.Cabrita, L.D.Rossjohn, J.Pike, R.N.Bottomley, S.P.Whisstock, J.C.

(2003) Structure 11: 387-397


  • PubMed Abstract: 
  • Serpins utilize conformational change to inhibit target proteinases; the price paid for this conformational flexibility is that many undergo temperature-induced polymerization. Despite this thermolability, serpins are present in the genomes of thermo ...

    Serpins utilize conformational change to inhibit target proteinases; the price paid for this conformational flexibility is that many undergo temperature-induced polymerization. Despite this thermolability, serpins are present in the genomes of thermophilic prokaryotes, and here we characterize the first such serpin, thermopin. Thermopin is a proteinase inhibitor and, in comparison with human alpha(1)-antitrypsin, possesses enhanced stability at 60 degrees C. The 1.5 A crystal structure reveals novel structural features in regions implicated in serpin folding and stability. Thermopin possesses a C-terminal "tail" that interacts with the top of the A beta sheet and plays an important role in the folding/unfolding of the molecule. These data provide evidence as to how this unusual serpin has adapted to fold and function in a heated environment.


    Organizational Affiliation

    The Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, 3800, Clayton, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine Proteinase Inhibitor (SERPIN), Chain A
A
323Thermobifida fusca (strain YX)N/A
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Go to UniProtKB:  Q47NK3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine Proteinase Inhibitor (SERPIN), Chain B
B
43Thermobifida fusca (strain YX)N/A
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Go to UniProtKB:  Q47NK3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.936α = 90.00
b = 65.595β = 90.00
c = 124.737γ = 90.00
Software Package:
Software NamePurpose
ARP/wARPmodel building
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description