Thromb Haemost 2000; 84(06): 989-997
DOI: 10.1055/s-0037-1614161
Review Article
Schattauer GmbH

Identification and Three-dimensional Structural Analysis of Nine Novel Mutations in Patients with Prothrombin Deficiency

Sepideh Akhavan
1   From Angelo Bianchi Bonomi Hemophilia and Thrombosis Center and Fondazione Luigi Villa, IRCCS Maggiore Hospital and University of Milan, Italy
,
Pier M. Mannucci
1   From Angelo Bianchi Bonomi Hemophilia and Thrombosis Center and Fondazione Luigi Villa, IRCCS Maggiore Hospital and University of Milan, Italy
,
Manijeh Lak
2   Department of Hematology, Iman Khomeini Hospital, University of Tehran, Iran
,
Giacomo Mancuso
3   Hemophilia Center, University of Palermo, Italy
,
Maria G. Mazzucconi
4   Institute of Hematology, University of Rome, Italy
,
Angiola Rocino
5   Department of Hematology, Nuovo Pellegrini Hospital, Naples, Italy
,
P. Vincent Jenkins
6   Haemophilia Center and Haemostasis Unit, Department of Haematology, Royal Free and University College Medical School, Royal Free Campus, London United Kingdom
,
Stephen J. Perkins
7   Department of Biochemistry and Molecular Biology, Royal Free and University College Medical School, Royal Free Campus, London, United Kingdom
› Author Affiliations

The financial support of the Katharine Dormandy Trust for Haemophilia and Allied Disorders, the Foundation Luigi Villa “Centro Studi di Patologia Molecolare applicata alla Clinica” and the Foundation Angelo Bianchi Bonomi is gratefully acknowledged. We would like to thank Ms. Veena Chantarangkul who did the prothrombin assays and Dr. Sirous Zeinali and the staff of the Pasteur Institute of Iran for their help in the collection and storage of blood samples.
Further Information

Publication History

Received 12 April 2000

Accepted after revision 01 August 2000

Publication Date:
13 December 2017 (online)

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Summary

Prothrombin deficiency is an autosomal recessive disorder associated with a moderately severe bleeding tendency. In this study, 13 patients with prothrombin deficiency were screened for the presence of alterations in the prothrombin gene, and nine novel candidate mutations were identified. Of 11 patients with hypoprothrombinemia, ten are homozygous for five mutations and one patient is a compound heterozygote. The two patients with dysprothrombinemia are homozygous for two mutations. Eight of nine mutations are missense ones associated with single amino acid substitutions in the propeptide (Arg-1Gln, Arg-2Trp), the kringle-1 (Asp118Try) and kringle-2 (Arg220Cys) domains and the catalytic serine protease domain (Gly330Ser, Ser354Arg, Arg382His and Arg538Cys). The ninth mutation is an in-frame deletion of 3 bp that results in the omission of one amino acid (del Lys 301/302). The combination of these missense mutations with crystal structures for α-thrombin and the prothrombin fragments 1 and 2 resulted in new insight into the function of α-thrombin. The hypoprothrombinemia mutations were inferred to affect either the cleavage of the propeptide from the Gla domain, the stability of the kringle-1 and −2 domains, or the close association of the A and B chains of the serine protease domain. The dysprothrombinemia mutations were inferred to directly affect catalytic function through their location at the active site crevice or exosite 1 within the serine protease domain.