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  • 1
    ISSN: 1573-8221
    Keywords: thrombin ; thymosin ; platelets ; blood coagulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A pentapeptide (EEAEN), which is the 24–28 fragment of the COOH-terminal sequence in the thymosinα1 molecule highly homologous with the 54–58 region of hirudin (with the complementary anion-binding exosite in the thrombin molecule), was synthesized by a solid-phase method. Preincubation of α-thrombin with EEAEN in concentrations of 0.1 pM to 1 nM reduced its clotting activity while preincubation of this enzyme with EEAEN in concentrations of 0.01 to 1 nM reduced its platelet-aggregating activity. The reaction of EEAEN with thrombin is shown to be similar to the reaction of the entire thymosinα1 molecule. It is concluded that the COOH-terminal thymosinα1 peptide EEAEN may be the reactive site responsible for the antithrombin activity of thymosinα1.
    Type of Medium: Electronic Resource
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