Action of acetylxylan esterase from Trichoderma reesei on acetylated methyl glycosides

Peter Biely (Corresponding Author), G. Cote, L. Kremnicky, R. Greene, Maija Tenkanen

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Substrate specificity of purified acetylxylan esterase (AcXE) from Trichoderma reesei was investigated on partially and fully acetylated methyl glycopyranosides. Methyl 2,3,4-tri-O-acetyl-β-d-xylopyranoside was deacetylated at positions 2 and 3, yielding methyl 4-O-acetyl-β-d-xylopyranoside in almost 90% yield. Methyl 2,3-di-O-acetyl β-d-xylopyranoside was deacetylated at a rate similar to the fully acetylated derivative. The other two diacetates (2,4- and 3,4-), which have a free hydroxyl group at either position 3 or 2, were deacetylated one order of magnitude more rapidly. Thus the second acetyl group is rapidly released from position 3 or 2 after the first acetyl group is removed from position 2 or 3. The results strongly imply that in degradation of partially acetylated β-1,4-linked xylans, the enzyme deacetylates monoacetylated xylopyranosyl residues more readily than di-O-acetylated residues. The T. reesei AcXE attacked acetylated methyl β-d-glucopyranosides and β-d-mannopyranosides in a manner similar to the xylopyranosides.

Original languageEnglish
Pages (from-to)121-124
JournalFEBS Letters
Volume420
Issue number2-3
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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