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• W2891714892 abstract "Carbohydrate binding modules (CBMs) are non-catalytic domains within larger multidomain polypeptides. The CelH from Ruminoclostridium (Clostridium) thermocellum contains a family 11 CBM (RtCBM11) with high binding affinity for the linear polysaccharide β-glucan, and low affinity for the branched xyloglucan. Screening a random RtCBM11 mutant phage library created by error prone PCR for xyloglucan binding identified RtCBM11 mutants with enhanced xyloglucan affinity. Subsequent recombination of the selected variants by site-directed mutagenesis generated the H102L/Y152F and Y46N/G52D/H102L/Y152F mutants. Fusion of the quadruple RtCBM11 mutant with the xyloglucanase from Aspergillus niveus increased the catalytic efficiency of the enzyme by 38%. Isothermal titration calorimetry demonstrated increased xyloglucan affinity for both mutants and reduced affinity for β-glucan in the H102L/Y152F mutant. Molecular dynamics simulations indicated that the increased xyloglucan specificity results both from formation of a xylosyl binding pocket in the carbohydrate binding cleft, and via modulation of a hydrogen bond network between the oligosaccharide ligand and the protein. These results explain the improved xyloglucan binding in the RtCBM11 H102L/Y152F mutant and advance the understanding of the structural determinants of CBMs binding that discriminate between branched and unbranched polysaccharides." @default.
• W2891714892 created "2018-09-27" @default.
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• W2891714892 date "2018-12-01" @default.
• W2891714892 modified "2023-09-23" @default.
• W2891714892 title "Engineering the affinity of a family 11 carbohydrate binding module to improve binding of branched over unbranched polysaccharides" @default.
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• W2891714892 doi "https://doi.org/10.1016/j.ijbiomac.2018.09.022" @default.
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