Add time:08/03/2019         Source:sciencedirect.com

Tryptic activity was competitively inhibited by cationic detergents which contain a cetyl group or longer hydrocarbon chains. Since the cetyl group is much longer than the side chains of lysine or arginine residues of substrates for trypsin, the nature of inhibition by cetyldimethylbenzylammonium (cas 10328-34-4) chloride was examined using Na-benzoyl-l-arginine-p-nitroanilide as substrate and compared to that by butylamine. The inhibition by cetyldimethylbenzylammonium chloride occurred instantaneously and was completely reversible. The inhibitory effect of cetyldimethylbenzylammonium chloride was strongly dependent on both pH and salt concentration, contrasting with inhibition by butylamine which was relatively indifferent to these changes. The Ki value of cetyldimethylbenzylammonium chloride at pH 7.5 and 25 °C was calculated to be 2.0 ± 0.3 mM, which is equal to that of butylamine within experimental errors. The standard entropy change of binding of cetyldimethylbenzylammonium chloride (44 ± 2 cal/mol/degree) was much larger than for butylamine, indicating the formation of an efficient hydrophobic bond between the cetyl group and the enzyme.

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