Thromb Haemost 2001; 85(01): 108-113
DOI: 10.1055/s-0037-1612912
Review Article
Schattauer GmbH

Fibrinogen Matsumoto V: a Variant with Aα19 Arg → Gly (AGG → GGG)

Comparison between Fibrin Polymerization Stimulated by Thrombin or Reptilase and Fibrin Monomer Polymerization
Hitoshi Tanaka
1  Second Department of Internal Medicine, Shinshu University School of Medicine, Nagano, Nagano, Japan
,
Fumiko Terasawa
2  Laboratory of Clinical Chemistry, Department of Medical Technology, School of Allied Medical Sciences, Shinshu University, Matsumoto, Nagano, Japan
,
Toshiro Ito
3  Department of Internal Medicine, Nagano Red Cross Hospital, Nagano, Nagano, Japan
,
Shin-ichi Tokunaga
3  Department of Internal Medicine, Nagano Red Cross Hospital, Nagano, Nagano, Japan
,
Fumihiro Ishida
1  Second Department of Internal Medicine, Shinshu University School of Medicine, Nagano, Nagano, Japan
,
Kiyoshi Kitano
1  Second Department of Internal Medicine, Shinshu University School of Medicine, Nagano, Nagano, Japan
,
Kendo Kiyosawa
1  Second Department of Internal Medicine, Shinshu University School of Medicine, Nagano, Nagano, Japan
,
Nobuo Okumura
2  Laboratory of Clinical Chemistry, Department of Medical Technology, School of Allied Medical Sciences, Shinshu University, Matsumoto, Nagano, Japan
› Author Affiliations
Further Information

Publication History

Received 18 May 2000

Accepted 24 August 2000

Publication Date:
08 December 2017 (online)

Summary

Fibrinogen Matsumoto V (M-V) is a dysfibrinogen identified in a 52-year-old woman with systemic lupus erythematous. The triplet AGG encoding the amino acid residue Aα19 was replaced by GGG, resulting in the substitution of Arg→Gly. Residue Aα19 has been shown to be one of the most important amino acids in the so-called ‘A’ site or α-chain knob. The thrombin-catalyzed release of fibrinopeptide A from M-V fibrinogen was only slightly delayed yet release of fibrinopeptide B was significantly delayed. Both thrombin-catalyzed fibrin polymerization and fibrin monomer polymerization were markedly impaired compared to normal fibrinogen. In addition, reptilase-catalyzed fibrin polymerization of M-V was much more impaired than thrombin-catalyzed fibrin polymerization. These results indicate ‘B’ and/or ‘b’ site of M-V fibrinogen play a more important role in thrombin- catalyzed fibrin polymerization than that of normal control fibrinogen.