Stereochemical course of hydrolysis catalyzed by arabinofuranosyl hydrolases

FEBS Letters
S M PitsonGerrit Beldman

Abstract

The stereochemical course of hydrolysis catalyzed by various enzymes acting on arabinofuranosyl linkages has been determined. 1H-NMR analysis of the action of endo-(1-->5)-alpha-L-arabinanases from Aspergillus niger and Aspergillus aculeatus showed that both hydrolyze linear arabinan with inversion of configuration, and may therefore act via a single displacement mechanism. This is consistent with the A. niger enzyme's classification in glycosyl hydrolase family 43. The catalytic mechanisms of alpha-L-arabinofuranosidases from A. niger, A. aculeatus, Aspergillus awamori, Humicola insolens, Penicillium capsulatum and Bacillus subtilis were investigated using both 1H-NMR and high performance anion exchange chromatography to follow glycosyl transfer reactions to methanol. In all cases these enzymes catalyzed the reaction with retention of configuration, and therefore probably operate via double displacement hydrolytic mechanisms. From the results with arabinofuranosidase A and B from A. niger we predict that all members of glycosyl hydrolase family 51 and 54 catalyze hydrolysis with net retention of anomeric configuration. Similar studies with (1-->4)-beta-D-arabinoxylan arabinohydrolases from A. awamori, Trichoderma reesei and Bi...Continue Reading

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Citations

Aug 10, 2006·Applied Microbiology and Biotechnology·Issam SmaaliMichael J O'Donohue
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