Gly74Ser mutation in protein C causes thrombosis due to a defect in protein S-dependent anticoagulant function

Changming Chen; Likui Yang; Bruno O. Villoutreix; Xuefeng Wang; Qiulan Ding; Alireza R. Rezaie

doi:10.1160/TH17-01-0043

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2017; 117(07): 1358-1369
DOI: 10.1160/TH17-01-0043

Coagulation and Fibrinolysis

Schattauer GmbH

Gly74Ser mutation in protein C causes thrombosis due to a defect in protein S-dependent anticoagulant function

Authors

Changming Chen

¹State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
Likui Yang

²Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma, USA
Bruno O. Villoutreix

³Inserm U973, Université Paris Diderot, Sorbonne Paris Cité, Molécules Thérapeutiques In Silico, Paris, France
Xuefeng Wang

⁴Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
Qiulan Ding

⁴Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
Alireza R. Rezaie

²Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma, USA

Abstract

Summary

Protein C is a vitamin K–dependent serine protease zymogen in plasma which upon activation by thrombin in complex with thrombomodulin (TM) down-regulates the clotting cascade by a feedback loop inhibition mechanism. Activated protein C (APC) exerts its anticoagulant function through protein S-dependent degradation of factors Va and VIIIa. We recently identified a venous thrombosis patient whose plasma level of protein C antigen is normal, but its anticoagulant activity is only 34% of the normal level. Genetic analysis revealed that the proband and her younger brother carry a novel heterozygous mutation c.346G>A, p.Gly74Ser (G74S) in PROC. Thrombin generation assay indicated that the TM-dependent anticoagulant activity of the proband’s plasma has been significantly impaired. We expressed protein C-G74S in mammalian cells and characterised its properties in established coagulation assays. We demonstrate that the protein C variant can be normally activated by the thrombin-TM complex and the resulting APC mutant also exhibits normal amidolytic and proteolytic activities toward both FVa and FVIIIa. However, it was discovered the protein S-dependent catalytic activity of APC variant toward both procoagulant cofactors has been significantly impaired. Protein S concentration-dependence of FVa degradation revealed that the capacity of APC variant to interact with the cofactor has been markedly impaired. The same results were obtained for inactivation of FVa-Leiden suggesting that the protein S-dependent activity of APC variant toward cleavage of Arg-306 site has been adversely affected. These results provide insight into the mechanism through which G74S substitution in APC causes thrombosis in the proband carrying this mutation.

Keywords

Protein C - protein S - factor Va - factor VIIIa - thrombosis

Full Text

References

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