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New chromogenic substrates for thrombin with increased specificity.

H J Kolde, R Eberle, H Heber

    Thrombosis and Haemostasis
    |October 21, 1986
    PubMed
    Summary
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    New chromogenic substrates using 5-amino-2-nitro benzoic acid (ANBA) enhance thrombin specificity for assays like PT and APTT. These substrates reduce hydrolysis by other enzymes, improving selective thrombin measurement.

    Area of Science:

    • Biochemistry
    • Analytical Chemistry

    Background:

    • Specific chromogenic substrates are crucial for functional assays like photometric prothrombin time (PT) and activated partial thromboplastin time (APTT).
    • Existing substrates may lack the high specificity required for accurate thrombin activity measurement in complex biological mixtures.

    Purpose of the Study:

    • To develop novel chromogenic peptide substrates with improved specificity for thrombin.
    • To evaluate the utility of these new substrates in functional coagulation assays.

    Main Methods:

    • Synthesized tripeptide sequences selective for thrombin coupled to 5-amino-2-nitro benzoic acid (ANBA) derivatives.
    • Compared hydrolysis rates and Michaelis-Menten (KM) values of ANBA-based substrates with para-nitroanilide (pNA) substrates using thrombin and other proteases (kallikrein, plasmin, factor Xa).

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    Main Results:

    • ANBA-substituted chromogenic substrates demonstrated significantly decreased hydrolysis rates by kallikrein, plasmin, and factor Xa compared to pNA-based substrates.
    • These ANBA peptide substrates remained sensitive to thrombin, with KM values comparable to pNA-peptides.
    • The modified substrates showed potential for selective thrombin detection.

    Conclusions:

    • Coupling thrombin-selective tripeptides to ANBA derivatives enhances chromogenic substrate specificity.
    • ANBA peptide substrates offer a promising tool for selective thrombin measurement in the presence of other proteases.
    • These substrates are suitable for colorimetric determination of PT and APTT assays.