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Thromb Haemost 2013; 110(01): 31-38
DOI: 10.1160/TH12-10-0780
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Molecular basis of coagulation factor V deficiency caused by the R1698W inter-domain mutation

Sara Calzavarini   §
1   Department of Life Science and Biotechnology, University of Ferrara, Ferrara, Italy
2   Inserm UMR-S 973, University Paris Diderot, Paris, France
3   Department of Laboratory Medicine, Clinical Chemistry, University of Lund, University Hospital, Malmö, Sweden
,
Bruno O. Villoutreix
2   Inserm UMR-S 973, University Paris Diderot, Paris, France
,
Barbara Lunghi
1   Department of Life Science and Biotechnology, University of Ferrara, Ferrara, Italy
,
Ruzica Livaja
3   Department of Laboratory Medicine, Clinical Chemistry, University of Lund, University Hospital, Malmö, Sweden
,
Francesco Bernardi
1   Department of Life Science and Biotechnology, University of Ferrara, Ferrara, Italy
,
Björn Dahlbäck
3   Department of Laboratory Medicine, Clinical Chemistry, University of Lund, University Hospital, Malmö, Sweden
› Author Affiliations
Further Information

Publication History

Received: 31 October 2012

Accepted after major revision: 22 March 2013

Publication Date:
30 November 2017 (online)

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Summary

Coagulation factor V (FV) deficiency is characterised by variable bleeding phenotypes and heterogeneous mutations. To add new insights into the FV genotype-phenotype relationship, we characterised the R1698W change in the A3 domain, at the poorly investigated interface with the A2 domain. The FV R1698W mutation was responsible for a markedly reduced expression level (10% of FV-WT) and specific activity in thrombin generation (0.39). Interestingly, the FVa1698W showed rapid activity decay upon activation due to increased dissociation rate between the heavy and light chains. The importance of the size and charge of the residue at position 1698 was investigated by three additional recombinant mutants, FVR1698A, FVR1698Q, and FVR1698E. FVR1698A and FVR1698Q expression (30 and 45% of FV-WT), specific activity (both 0.57) and stability were all reduced. Noticeably, FVR1698E showed normal activity and stability despite poor expression (10% of FV-WT). These data indicate the essential role of R1698 for normal biosynthetic process and support local flexibility for positively or negatively charged residues to produce stable and functional A3-A2 domain interactions. Their experimental alteration produces a gradient of FV defects, which help to interpret the wide spectrum of phenotypes in FV-deficient patients.

Keywords

Factor V deficiency - factor V structure - A domains - genotype-phenotype relationship

§ Present address: Service and Central Laboratory of Hematology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Rue du Bugnon 46, CH-1011 Lausanne, Switzerland.


 

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