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

Authors

  • 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
Further Information

Publication History

Received 18 May 2000

Accepted 24 August 2000

Publication Date:
08 December 2017 (online)

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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.