Abstract
The specificity of porcine elastase (EC 3.4.4.7) has been studied. Ethyl esters derived from benzoyl amino acids with straight side chains are better substrates than those with branched side chains; the best substrate is norvaline ester. In the series of benzoylalanine alkyl esters the alcohol moiety markedly affects the susceptibility. The benzyl ester was found to be the best nonactivated substrate derived from monomeric amino acid. With elastase acylation is rate limiting, in contrast to chymotrypsin and trypsin where deacylation is generally the rate determining step with specific ester substrates.
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