alexa beta 2-Glycoprotein I: a plasma inhibitor of the contact activation of the intrinsic blood coagulation pathway.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Proteomics & Bioinformatics

Author(s): Schousboe I

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Abstract The general hypothesis for the biological function of beta 2-glycoprotein I is that it neutralizes all negatively charged macromolecules that might enter the bloodstream and diminishes unwanted activation of the blood coagulation. In the present study we report that beta 2-glycoprotein I inhibits the activation of the contact phase system of the intrinsic pathway of blood coagulation. Activation was accomplished by an ellagic acid-phospholipid suspension (Cephotest) and measured by the appearance of amidolytic activity using the chromogenic substrate H-D-Pro-Phe-Arg-p-nitroanilide (S-2302). This inhibitory effect of beta 2-glycoprotein I was observed both when Cephotest was preincubated with beta 2-glycoprotein I and when the amount of beta 2-glycoprotein I in plasma was increased by addition of beta 2-glycoprotein I to either normal or beta 2-glycoprotein I-deficient plasma. The inhibitory effect of beta 2-glycoprotein I on the contact phase activation could be one of the physiological functions of this protein.
This article was published in Blood and referenced in Journal of Proteomics & Bioinformatics

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