Abstract
Glucuronoyl esterase is a novel carbohydrate esterase recently discovered in the cellulolytic system of the wood-rotting fungus Schizophyllum commune on the basis of its ability to hydrolyze methyl ester of 4-O-methyl-d-glucuronic acid. This substrate was not fully corresponding to the anticipated function of the enzyme to hydrolyze esters between xylan-bound 4-O-methyl-d-glucuronic acid and lignin alcohols occurring in plant cell walls. In this work we showed that the enzyme was capable of hydrolyzing two synthetic compounds that mimic the ester linkages described in lignin-carbohydrate complexes, esters of 4-O-methyl-d-glucuronic and d-glucuronic acid with 3-(4-methoxyphenyl)propyl alcohol. A comparison of kinetics of hydrolysis of methyl and 3-(4-methoxyphenyl)propyl esters indicated that the glucuronoyl esterase recognizes the uronic acid part of the substrates better than the alcohol type. The catalytic efficiency of the enzyme was much higher with the ester of 4-O-methyl-d-glucuronic acid than with that of d-glucuronic acid. Examination of the action of glucuronoyl esterase on a series of methyl esters of 4-O-methyl-d-glucopyranuronosyl residues α-1,2-linked to xylose and several xylooligosaccharides suggested that the rate of deesterification is independent of the character of the carbohydrate part glycosylated by the 4-O-methyl-d-glucuronic acid.
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Acknowledgments
This work was supported by a Grant 2/6130/26 from the Slovak Grant Agency VEGA, a Grant from the Slovak Academy of Sciences to the Center of Excellence GLYCOBIOS and by a grant from the Slovak Research and Development Agency under the Contract No. APVV-51-003805.
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Communicated by Geoffrey Turner.
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Špániková, S., Poláková, M., Joniak, D. et al. Synthetic esters recognized by glucuronoyl esterase from Schizophyllum commune . Arch Microbiol 188, 185–189 (2007). https://doi.org/10.1007/s00203-007-0241-x
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DOI: https://doi.org/10.1007/s00203-007-0241-x