Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.2.1.21 (beta-glucosidase)
 3,280 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Thioglycoligases are recently introduced variants of retaining glycosidases in which the acid-base catalyst has been mutated, rendering them capable of thioglycoside synthesis. The original acid-base mutant of Agrobacterium sp. beta-glucosidase (E170A) was previously shown to be an effective thioglycoligase carrying out glycosyltransfer from 2,4-dinitrophenyl glycosides to several different thio sugar acceptors. Here we report the generation of a screen for improved thioglycoligases, randomized mutagenesis of the acid-base catalyst E170 and identification of variants superior to E170A. Furthermore we have established a coupled assay allowing kinetic analysis of isolated variants and found that Abg E170Q is 5-fold faster than Abg E170A when 2,4-dinitrophenyl glucoside is used as donor and 100-fold faster when glucosyl azide is used. To demonstrate its utility, different acceptor and donor sugar combinations were employed to produce thio-linked di- or trisaccharides in high yields, showing the considerable versatility of the system for the synthesis of carbohydrate mimetics.
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PMID:Engineering of a thioglycoligase: randomized mutagenesis of the acid-base residue leads to the identification of improved catalysts. 1579 May 78