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Pubmed ID :27600355
Publication Date : //

Functional expression and characterization of a glucuronoyl esterase from the fungus Neurospora crassa: identification of novel consensus sequences containing the catalytic triad.


The complete hydrolysis of lignocellulose requires the actions of a variety of enzymes, including those that cleave the linkage between lignin and hemicellulose. The enzyme glucuronoyl esterase (GE) that constitutes a novel family of carbohydrate esterases, CE15, has been shown to display a unique ability to cleave the ester linkage between lignin alcohols and xylan-bound 4-O-methyl-D-glucuronic acid of hemicellulose. We herein report identification, expression, and functional characterization of a new GE, NcGE, from the filamentous fungus Neurospora crassa. C-terminally c-myc and hexahistidine-tagged NcGE was heterologously expressed in the methylotrophic yeast Pichia pastoris. NcGE purified from the culture supernatant through Ni-NTA and anion exchange chromatographies showed the ability to hydrolyze the substrate 3-(4-methoxyphenyl) propyl methyl 4-O-methyl-α-D-glucopyranosiduronate, which mimics the ester linkage of 4-O-methyl-D-glucuronic acid in lignin-carbohydrate complexes (LCCs). This esterase showed the characteristic of a mesophilic enzyme with the temperature optimum at 40-50°C, and displayed the optimal activity at pH 7 and broad pH stability. Based on the alignment of NcGE with other GEs so far characterized, we propose novel consensus sequences for GEs containing the catalytic triad.

Authors : Huynh Hung Hiep , Arioka Manabu ,

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