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. 1974 Dec;143(3):663–668. doi: 10.1042/bj1430663

An examination of the utility of photogenerated reagents by using α-chymotrypsin

Alex J Bridges 1, Jeremy R Knowles 1,*
PMCID: PMC1168435  PMID: 4462748

Abstract

As a test of the labelling characteristics of photogenerated reagents, an aryl azide was photolysed in the aromatic-binding locus of a protein of known tertiary structure. The acyl-enzyme derived from the reaction of α-chymotrypsin with the p-nitrophenyl ester of p-azido[14C]cinnamate was isolated and photolysed. About 60% of the acyl group is covalently bound to the protein after photolysis and deacylation, and labelled enzyme is inactive. The covalently attached label is localized in the C chain of chymotrypsin, and there are firm indications that the major labelled tryptic fragment of the C chain is that which constitutes the aromatic-binding locus of the enzyme. The high degree of labelling of that portion of the protein molecule predicted on the basis of the known chemistry and structure of α-chymotrypsin, provides gratifying confirmation of the utility of the photo-labelling method.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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