1MTP

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.195 

Starting Model: experimental
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This is version 1.4 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

  • DOI: https://doi.org/10.1016/s0969-2126(03)00057-1
  • Primary Citation of Related Structures:  
    1MTP

  • 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 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
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine Proteinase Inhibitor (SERPIN), Chain A323Thermobifida fuscaMutation(s): 0 
UniProt
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Explore Q47NK3 
Go to UniProtKB:  Q47NK3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47NK3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Serine Proteinase Inhibitor (SERPIN), Chain B43Thermobifida fuscaMutation(s): 0 
UniProt
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Explore Q47NK3 
Go to UniProtKB:  Q47NK3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47NK3
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 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
b = 65.595β = 90
c = 124.737γ = 90
Software Package:
Software NamePurpose
ARP/wARPmodel building
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Refinement description