Thromb Haemost 1975; 33(03): 553-563
DOI: 10.1055/s-0038-1647849
Original Article
Schattauer GmbH

The Activation of Human Factor IX

B Østerud
1   Institute of Medical Biology, University of Tromsø and Department of Pharmacology, Institute of Pharmacy, University of Oslo, Norway
,
K Laake
1   Institute of Medical Biology, University of Tromsø and Department of Pharmacology, Institute of Pharmacy, University of Oslo, Norway
,
H Prydz
1   Institute of Medical Biology, University of Tromsø and Department of Pharmacology, Institute of Pharmacy, University of Oslo, Norway
› Author Affiliations
Further Information

Publication History

Received 03 September 1974

Accepted 29 November 1974

Publication Date:
02 July 2018 (online)

Summary

The activation of factor IX purified from human plasma has been studied. Factor XIa and kallikrein separately activated factor IX to factor IXa. In both cases factor IX a had an apparent molecular weight of about 42–45000 in sodium dodecyl sul-phate-polyacrylamide disc gel electrophoresis compared with a molecular weight of about 70000 for the native factor IX. The activation by XIa required Ca2+-ions whereas Ca2+-ions did not influence the activation by kallikrein. A mixture of tissue thromboplastin and factor VII or RusselPs-viper venom alone did not activate factor IX. Trypsin activated and plasmin inactivated factor IX.

 
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