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• W2900047097 abstract "Xylan saccharification is a key step in many important biotechnological applications. Xylose is the main product of xylan degradation and is a major xylanase inhibitor in a bioreactor; however, xylose-binding site of xylanase is not discovered yet. Evolving of xylose-tolerant xylanase variants will reduce the cost of xylanases in industry. Glycoside hydrolase family-10 thermostable Geobacillus stearothermophilus xylanase XT6 is non-competitively inhibited by xylose with inhibition constant ki equals to 12.2 mM. In the absence of X-ray crystallography of xylanase–xylose complex, unbiased random mutagenesis of the whole xylanase gene was done by error-prone polymerase chain reaction constructing a huge library. Screening a part of the library revealed xylose-tolerant mutants having three mutations, M116I, L131P and L133V, clustered in the N-terminus of α-helix 3. The best xylose-tolerant mutant showed higher ki and catalytic capability than that of the parent by 3.5- and 3-fold, respectively. In addition, kcat increased 4.5-fold and KM decreased 2-fold. The molecular docking of xylose into xylanase XT6 structure showed that xylose binds into a small pocket between N-terminus of α-helices 3 and 4 and close to the three mutations. Mobility of α-helices 3 and 4, which controls catalysis rate, is restricted by xylose binding and increased by these mutations." @default.
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• W2900047097 date "2018-11-08" @default.
• W2900047097 modified "2023-09-26" @default.
• W2900047097 title "Revealing of a novel xylose-binding site of <i>Geobacillus stearothermophilus</i> xylanase by directed evolution" @default.
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• W2900047097 doi "https://doi.org/10.1093/jb/mvy092" @default.
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