4HZH

Structure of recombinant Gla-domainless prothrombin mutant S525A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.295 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of prothrombin reveals conformational flexibility and mechanism of activation.

Pozzi, N.Chen, Z.Gohara, D.W.Niu, W.Heyduk, T.Di Cera, E.

(2013) J.Biol.Chem. 288: 22734-22744

  • DOI: 10.1074/jbc.M113.466946

  • PubMed Abstract: 
  • The zymogen prothrombin is composed of fragment 1 containing a Gla domain and kringle-1, fragment 2 containing kringle-2, and a protease domain containing A and B chains. The prothrombinase complex assembled on the surface of platelets converts proth ...

    The zymogen prothrombin is composed of fragment 1 containing a Gla domain and kringle-1, fragment 2 containing kringle-2, and a protease domain containing A and B chains. The prothrombinase complex assembled on the surface of platelets converts prothrombin to thrombin by cleaving at Arg-271 and Arg-320. The three-dimensional architecture of prothrombin and the molecular basis of its activation remain elusive. Here we report the first x-ray crystal structure of prothrombin as a Gla-domainless construct carrying an Ala replacement of the catalytic Ser-525. Prothrombin features a conformation 80 Å long, with fragment 1 positioned at a 36° angle relative to the main axis of fragment 2 coaxial to the protease domain. High flexibility of the linker connecting the two kringles suggests multiple arrangements for kringle-1 relative to the rest of the prothrombin molecule. Luminescence resonance energy transfer measurements detect two distinct conformations of prothrombin in solution, in a 3:2 ratio, with the distance between the two kringles either fully extended (54 ± 2 Å) or partially collapsed (≤34 Å) as seen in the crystal structure. A molecular mechanism of prothrombin activation emerges from the structure. Of the two sites of cleavage, Arg-271 is located in a disordered region connecting kringle-2 to the A chain, but Arg-320 is well defined within the activation domain and is not accessible to proteolysis in solution. Burial of Arg-320 prevents prothrombin autoactivation and directs prothrombinase to cleave at Arg-271 first. Reversal of the local electrostatic potential then redirects prothrombinase toward Arg-320, leading to thrombin generation via the prethrombin-2 intermediate.


    Related Citations: 
    • Crystal structure of prethrombin-1.
      Chen, Z.,Pelc, L.A.,Di Cera, E.
      (2010) Proc.Natl.Acad.Sci.USA 107: 19278


    Organizational Affiliation

    Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, Missouri 63104, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Prothrombin
A, B
533Homo sapiensMutation(s): 1 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to Gene View: F2
Go to UniProtKB:  P00734
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.295 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 82.584α = 90.00
b = 103.136β = 90.00
c = 149.549γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
MOLREPphasing
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-08-21
    Type: Database references