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Vinod Vathipadiekal, Anamika Verma, Mala Rao

Glycine-assisted enhancement of 1,4-?-d-xylan xylanohydrolase activity at alkaline pH with a pH optimum shift

Keywords: enzyme catalysis, OPTA, Thermomonospora sp, xylanase

This is the first report describing the enhancement of xylanase activity by the neutral amino acid glycine. Xylanase activity is increased seven-fold at alkaline pH in the presence of glycine and its pH optimum is shifted from pH 7 to 8 without using any protein engineering techniques. Analysis of the steady-state kinetics revealed that glycine in the reaction mixture increases the K_m and k_cat values of the enzyme. Chemoaffinity labeling and studies using glycine esters indicate an involvement of the carboxylate ion of glycine in enhancing xylanase catalytic activity. A novel possible mechanism for the glycine-assisted catalytic action of xylanase is proposed.

Biological Chemistry, Walter de Gruyter

Print ISSN: 1431-6730
Volume: 388, 01/2007
Pages: 61 - 65

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