Kitano H, Maeda Y, Furukawa K, Yamamoto T, Izumida R, Matsugo S. Modification of alpha-chymotrypsin using a water-soluble photo-Fenton reagent.
Photochem Photobiol 1995;
62:809-12. [PMID:
8570717 DOI:
10.1111/j.1751-1097.1995.tb09140.x]
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Abstract
Modification of an enzyme, alpha-chymotrypsin, was examined by using a water-soluble photo-Fenton reagent. By photoirradiation of the enzyme with the reagent, which can occupy a binding site of the enzyme, a tryptophan residue in the vicinity of the active site was oxidized to N-formylkynurenine. Concurrently, the catalytic properties of the enzyme were largely changed: the Km was increased and the kcat was decreased. The decrease in kcat for a specific amide substrate was the most significant among the esters and amides examined. The water-soluble photo-Fenton reagent would be useful to chemically modify relatively limited regions in biomolecules.
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