Studies on chymotrypsin-like catalysis by synthetic peptides |
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Authors: | Michael J Corey Eva Hallakova Kathleen Pugh John M Stewart |
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Institution: | (1) Department of Biochemistry, University of Colorado School of Medicine, 80262 Denver, CO |
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Abstract: | The synthetic peptide Chymohelizyme-1 (CHZ-1) exhibits esterase activity against carbobenzoxytyrosinep-nitrophenyl ester (ZTONP), carbobenzoxyalaninep-nitrophenyl ester (ZAONP), andt-butyloxycarbonyltyrosinep-nitrophenyl ester (BocTONP). However, earlier reports of catalytic activity against less labile esters and amides have proven
to be incorrect. The major reason for the errors appears to have been the omission of certain controls in the previous work.
Although the catalytic triad does not appear to be functioning as designed, the catalytic activity of CHZ-1 does depend on
the integrity of its primary structure. The pH dependence of hydrolysis of ZTONP points to general-base catalysis, whereas
a preference for hydrophobic substrates suggest that the structure of CHZ-1 is performing some other role in assisting catalysis. |
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Keywords: | Chymohelizyme enzyme synthetic peptide synthesis |
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