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- W1990092958 abstract "Human glutathione transferase A1-1 (hGST A1-1) can be reengineered by rational design into a catalyst for thiolester hydrolysis with a catalytic proficiency of 1.4 × 107 M−1. The thiolester hydrolase, A216H that was obtained by the introduction of a single histidine residue at position 216 catalyzed the hydrolysis of a substrate termed GSB, a thiolester of glutathione and benzoic acid. Here we investigate the substrate requirements of this designed enzyme by screening a thiolester library. We found that only two thiolesters out of 18 were substrates for A216H. The A216H-catalyzed hydrolysis of GS-2 (thiolester of glutathione and naphthalenecarboxylic acid) exhibits a kcat of 0.0032 min−1 and a KM of 41 µM. The previously reported catalysis of GSB has a kcat of 0.00078 min−1 and KM of 5 µM. The kcat for A216H-catalyzed hydrolysis of GS-2 is thus 4.1 times higher than for GSB. The catalytic proficiency (kcat/KM)/kuncat for GS-2 is 3 × 106 M−1. The promiscuous feature of the wt protein towards a range of different substrates has not been conserved in A216H but we have obtained a selective enzyme with high demands on the substrate." @default.
- W1990092958 created "2016-06-24" @default.
- W1990092958 creator A5000988865 @default.
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- W1990092958 date "2006-01-01" @default.
- W1990092958 modified "2023-09-26" @default.
- W1990092958 title "A promiscuous glutathione transferase transformed into a selective thiolester hydrolase" @default.
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- W1990092958 doi "https://doi.org/10.1039/b510115h" @default.
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