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Engineering of pyranose 2-oxidase from Peniophora gigantea towards improved thermostability and catalytic efficiency.

Abstract：

:To improve the stability and catalytic efficiency of pyranose 2-oxidase (P2Ox) by molecular enzyme evolution, we cloned P2Ox cDNA by RACE-PCR from a cDNA library derived from the basidiomycete Peniophora gigantea. The P2Ox gene was expressed in Escherichia coli BL21(DE3), yielding an intracellular and enzymatically active P2OxB with a volumetric yield of 500 units/l. Site-directed mutagenesis was employed to construct the P2Ox variant E540K (termed P2OxB1), which exhibited increased thermo- and pH-stability compared with the wild type, concomitantly with increased catalytic efficiencies (k(cat)/K(m)) for D-xylose and L-sorbose. P2OxB1 was provided with a C-terminal His(6)-tag (termed P2OxB1H) and subjected to directed evolution using error-prone PCR. Screening based on a chromogenic assay yielded the new P2Ox variant K312E (termed P2OxB2H) that showed significant improvements with respect to k(cat)/K(m) for D-glucose (5.3-fold), methyl-beta-D-glucoside (2.0-fold), D-galactose (4.8-fold), D-xylose (59.9-fold), and L-sorbose (69.0-fold), compared with wild-type P2Ox. The improved catalytic performance of P2OxB2H was demonstrated by bioconversions of L-sorbose that initially was a poor substrate for wild-type P2Ox. This is the first report on the improvement of a pyranose 2-oxidase by a dual approach of site-directed mutagenesis and directed evolution, and the application of the engineered P2Ox in bioconversions.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Bastian S,Rekowski MJ,Witte K,Heckmann-Pohl DM,Giffhorn F

doi

10.1007/s00253-004-1813-1

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

654-63

issue

5

eissn

0175-7598

issn

1432-0614

journal_volume

67

pub_type

杂志文章

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