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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/318

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dc.contributor.authorPandey, Manjula-
dc.contributor.authorMishra, Saroj-
dc.identifier.citationGene,190(1), 45-51en
dc.description.abstractThe B-glucosidase enzyme is important as the terminal enzyme involved in hydrolysis of cellobiose and short-chain cellodextrins generated during enzymatic cellulose degradation. Under controlled reaction conditions the enzyme also displays cello-oligosaccha-ride synthesizing ability (based on either the thermodynamic or kinetic approach). We present here the purification of the enzyme P-glucosidase (BGL) of Pichia etchellsii from recombinant pBG55 Escherichia coli clone. The kinetic parameters, substrate specificity and oligosaccharide synthesizing ability of the purified enzyme are also reported. The purified 200-kDa protein (tetramer of 50 kDa) was identified as a broad-substrate-specificity enzyme exhibiting increased temperature and glucose tolerance compared to the native yeast enzyme. Temperature directed substrate specificity for aryl fl,l-4 linkage, and B( l-2), j3( l-4), fl( l-6) and 8(2-1) linkages in various natural disaccharides was observed. Glycosylation of the enzyme was found to be unimportant for enzyme activity. With both cellobiose and glucose, oligosaccharide synthesis was detected. The implications of this information with regard to cellulose hydrolysis and oligosaccharide synthesis are discussed.en
dc.format.extent724539 bytes-
dc.subjectCellulose hydrolysisen
dc.subjectOligosaccharide biosynthesisen
dc.subjectYeast enzyme expressionen
dc.subjectBroad-substrate-specificity enzymeen
dc.titleExpression and characterization of Pichia etchellsii B-glucosidase in Escherichia colien
Appears in Collections:Biochemical Engg. and Biotechnology

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