Functional and sequence characterization of agkicetin, a new glycoprotein Ib antagonist isolated from Agkistrodon acutus venom. offf2p4.
Biochem Biophys Res Commun
; 210(2): 472-7, 1995 May 16.
Article
em En
| MEDLINE
| ID: mdl-7755623
ABSTRACT
A new glycoprotein Ib (GPIb) antagonist, agkicetin, was purified from the venom of Agkistrodon acutus and characterized. It is a disulfide-linked heterodimer consisting subunits of 15 and 14 kDa. The subunits are homologous to each other and to other snake venom proteins of the C-type (Ca(2+)-dependent) lectin superfamily. Agkicetin behaved as a potent antagonist of von Willebrand Factor (vWF)-induced platelet agglutination (IC50 = 12.5 nM) and bound specifically to GPIb of fixed platelets with high affinity (Kd = 38 nM). It did not bind coagulation factor IX and thrombin. Monoclonal antibody against epitope on the N-terminal domain of GPIb competed the binding of agkicetin with platelets. Reduced and alkylated agkicetin lost most of its inhibitory efficacy toward vWF-induced platelet agglutination.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Glicoproteínas da Membrana de Plaquetas
/
Venenos de Crotalídeos
/
Lectinas Tipo C
/
Lectinas
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Biochem Biophys Res Commun
Ano de publicação:
1995
Tipo de documento:
Article
País de afiliação:
China