3HK3

Crystal structure of murine thrombin mutant W215A/E217A (one molecule in the asymmetric unit)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mechanism of the Anticoagulant Activity of Thrombin Mutant W215A/E217A.

Gandhi, P.S.Page, M.J.Chen, Z.Bush-Pelc, L.Di Cera, E.

(2009) J Biol Chem 284: 24098-24105

  • DOI: 10.1074/jbc.M109.025403
  • Primary Citation of Related Structures:  
    3HK3, 3HKI, 3HKJ, 3HK6

  • PubMed Abstract: 
  • The thrombin mutant W215A/E217A (WE) is a potent anticoagulant both in vitro and in vivo. Previous x-ray structural studies have shown that WE assumes a partially collapsed conformation that is similar to the inactive E* form, which explains its drastically reduced activity toward substrate ...

    The thrombin mutant W215A/E217A (WE) is a potent anticoagulant both in vitro and in vivo. Previous x-ray structural studies have shown that WE assumes a partially collapsed conformation that is similar to the inactive E* form, which explains its drastically reduced activity toward substrate. Whether this collapsed conformation is genuine, rather than the result of crystal packing or the mutation introduced in the critical 215-217 beta-strand, and whether binding of thrombomodulin to exosite I can allosterically shift the E* form to the active E form to restore activity toward protein C are issues of considerable mechanistic importance to improve the design of an anticoagulant thrombin mutant for therapeutic applications. Here we present four crystal structures of WE in the human and murine forms that confirm the collapsed conformation reported previously under different experimental conditions and crystal packing. We also present structures of human and murine WE bound to exosite I with a fragment of the platelet receptor PAR1, which is unable to shift WE to the E form. These structural findings, along with kinetic and calorimetry data, indicate that WE is strongly stabilized in the E* form and explain why binding of ligands to exosite I has only a modest effect on the E*-E equilibrium for this mutant. The E* --> E transition requires the combined binding of thrombomodulin and protein C and restores activity of the mutant WE in the anticoagulant pathway.


    Related Citations: 
    • The anticoagulant thrombin mutant W215A/E217A has a collapsed primary specificity pocket.
      Pineda, A.O., Chen, Z.W., Caccia, S., Cantwell, A.M., Savvides, S.N., Waksman, G., Mathews, F.S., Di Cera, E.
      (2004) J Biol Chem 279: 39824

    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thrombin light chainA44Mus musculusMutation(s): 0 
Gene Names: F2Cf2
EC: 3.4.21.5
UniProt & NIH Common Fund Data Resources
Find proteins for P19221 (Mus musculus)
Explore P19221 
Go to UniProtKB:  P19221
IMPC:  MGI:88380
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Thrombin heavy chainB258Mus musculusMutation(s): 2 
Gene Names: F2Cf2
EC: 3.4.21.5
UniProt & NIH Common Fund Data Resources
Find proteins for P19221 (Mus musculus)
Explore P19221 
Go to UniProtKB:  P19221
IMPC:  MGI:88380
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.647α = 90
b = 63.939β = 90
c = 95.024γ = 90
Software Package:
Software NamePurpose
StructureStudiodata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-07-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance