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Screening the molecular surface of human anticoagulant protein C: a search for interaction sites

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Author

Summary, in English

Protein C (PC), a 62 kDa multi-modular zymogen, is activated to an anticoagulant serine protease (activated PC or APC) by thrombin bound to thrombomodulin on the surface of endothelial cells. PC/APC interacts with many proteins and the characterisation of these interactions is not trivial. However, molecular modelling methods help to study these complex biological processes and provide basis for rational experimental design and interpretation of the results. PC/APC consists of a Gla domain followed by two EGF modules and a serine protease domain. In this report, we present two structural models for full-length APC and two equivalent models for full-length PC, based on the X-ray structures of Gla-domainless APC and of known serine protease zymogens. The overall elongated shape of the models is further cross-validated using size exclusion chromatography which allows evaluation of the Stokes radius (rs for PC = 33.15 A; rs for APC = 34.19 A), frictional ratio and axial ratio. We then propose potential binding sites at the surface of PC/APC using surface hydrophobicity as a determinant of the preferred sites of intermolecular recognition. Most of the predicted binding sites are consistent with previously reported experimental data, while some clusters highlight new regions that should be involved in protein-protein interactions.

Publishing year

2001

Language

English

Pages

13-27

Publication/Series

Journal of Computer-Aided Molecular Design

Volume

15

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Other Basic Medicine
  • Medicinal Chemistry

Keywords

  • coagulation
  • protein C
  • protein interaction
  • protein modelling
  • thrombin

Status

Published

Research group

  • Protein Chemistry, Malmö
  • Clinical Chemistry, Malmö

ISBN/ISSN/Other

  • ISSN: 1573-4951