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Effects of gamma-carboxyglutamic acid and epidermal growth factor-like modules of factor IX on factor X activation. Studies using proteolytic fragments of bovine factor IX

In English

Författare

Summary, in English

Factor IX is a vitamin K-dependent zymogen of a serine protease. The NH2-terminal half of the molecule consists of a Ca(2+)-binding gamma-carboxyglutamic acid (Gla)-containing module and two modules homologous to the epidermal growth factor (EGF) precursor. To elucidate the role of these non-catalytic modules of factor IXa beta in factor X activation, we have isolated and characterized fragments of bovine factor IX, containing one or both of the EGF-like modules as well as these modules linked to the Gla module. The fragments were used as inhibitors of factor IXa beta-mediated factor X activation in a plasma clotting system and in systems with purified components of the Xase complex. Fragments consisting of either the two EGF-like modules of factor IX linked together or the NH2-terminal EGF-like module alone were found to inhibit factor Xa generation both in the presence and absence of the cofactor, factor VIIIa. Moreover, a fragment consisting of the corresponding modules of factor X had a similar effect. We therefore propose that factor IXa beta and factor X interact directly through their EGF-like modules on or in the vicinity of a phospholipid surface. We have also found that the isolated Gla module of factor IX inhibits the formation of factor Xa both in the presence and absence of phospholipid but not in the absence of factor VIIIa. Our results are compatible with a model of the Xase complex, in which both the serine protease part and the Gla module of factor IXa beta interact with factor VIIIa.

Publiceringsår

1992

Språk

Engelska

Sidor

3249-3256

Publikation/Tidskrift/Serie

Journal of Biological Chemistry

Volym

267

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

American Society for Biochemistry and Molecular Biology

Ämne

  • Clinical Medicine
  • Medicinal Chemistry

Status

Published

Forskningsgrupp

  • Clinical Chemistry, Malmö

ISBN/ISSN/Övrigt

  • ISSN: 1083-351X