Substrate binding by nonactivated papain

L.A.A.E. Sluyterman

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Samenvatting

The rate of activation of papain (EC 3.4.4.10) by cysteine was studied in the presence of various concentrations of a substrate, benzoylarginine ethyl ester. The activation rate was found to decrease with increasing substrate concentration. This was interpreted as due to binding of the substrate to the non-activated enzyme. From the data obtained, the dissociation constant Ks of the complex of substrate and non-activated papain could be calculated. Ks was found to be virtually equal to Km, the Michaelis-Menten constant of the active enzyme, both at pH 6 and pH 4. One of the conclusions of this investigation is that the thiol group of active papain is not essential for substrate binding.
Originele taal-2Engels
Pagina's (van-tot)577-586
TijdschriftBiochimica et Biophysica Acta, Enzymology
Volume113
Nummer van het tijdschrift3
DOI's
StatusGepubliceerd - 1966

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