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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of the catalytic nucleophile in the cellulase from Schizophyllum commune and assignment of the enzyme to Family 5, subtype 5 of the glycosidases.

Differential chemical modification of the cellulase from Schizophyllum commune with [N-methyl-3H]1-ethyl-3(4-azonia-4,4-dimethylpentyl)-carbodiimide in the presence and absence of substrate identified an active site glutamate residue within the peptide: Leu-Gln-Ala-Ala-Thr-Glu-Trp-Leu-(Lys). This Glu residue is proposed to participate in binding of substrate as amino acid sequence homology studies combined with mechanism-based inhibition of the cellulase with 4',5'-epoxypentyl-beta-D-cellobioside identified a neighboring Glu residue, which conforms to the Glu-X-Gly motif of Family 5 glycosidases, as the catalytic nucleophile. These data allow the assignment of the S. commune cellulase to Family 5, subtype 5 of the glycosidases.[1]


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