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 

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

  • DOI: 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 ...

    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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine Proteinase Inhibitor (SERPIN), Chain AA323Thermobifida fuscaMutation(s): 0 
UniProt
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Explore Q47NK3 
Go to UniProtKB:  Q47NK3
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Serine Proteinase Inhibitor (SERPIN), Chain BB43Thermobifida fuscaMutation(s): 0 
UniProt
Find proteins for Q47NK3 (Thermobifida fusca (strain YX))
Explore Q47NK3 
Go to UniProtKB:  Q47NK3
Protein Feature View
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