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.
Keywords
Fibrinogen - dysfibrinogenemia polymerizationion - thrombin - reptilase