Improved Transglycosylation by a Xyloglucan-Active α-l-Fucosidase from Fusarium graminearum

Journal of Fungi
Birgitte ZeunerAnne S Meyer

Abstract

Fusarium graminearum produces an α-l-fucosidase, FgFCO1, which so far appears to be the only known fungal GH29 α-l-fucosidase that catalyzes the release of fucose from fucosylated xyloglucan. In our quest to synthesize bioactive glycans by enzymatic catalysis, we observed that FgFCO1 is able to catalyze a transglycosylation reaction involving transfer of fucose from citrus peel xyloglucan to lactose to produce 2'-fucosyllactose, an important human milk oligosaccharide. In addition to achieving maximal yields, control of the regioselectivity is an important issue in exploiting such a transglycosylation ability successfully for glycan synthesis. In the present study, we aimed to improve the transglycosylation efficiency of FgFCO1 through protein engineering by transferring successful mutations from other GH29 α-l-fucosidases. We investigated several such mutation transfers by structural alignment, and report that transfer of the mutation F34I from BiAfcB originating from Bifidobacterium longum subsp. infantis to Y32I in FgFCO1 and mutation of D286, near the catalytic acid/base residue in FgFCO1, especially a D286M mutation, have a positive effect on FgFCO1 transfucosylation regioselectivity. We also found that enzymatic depolymer...Continue Reading

References

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Datasets Mentioned

BETA
AFR68935.1
AAD35394.1
ACJ53394.1

Methods Mentioned

BETA
transglycosylation
size exclusion chromatography
PCR

Software Mentioned

PyMOL
ESPript
md
YASARA
MUSCLE
JMP Pro

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