Abstract
cDNAs encoding two glycoside hydrolase family 1 β-glucosidases (BGL1A and BGL1B) were cloned from the basidiomycete Phanerochaete chrysosporium, and the substrate specificities of the recombinant enzymes and the expression patterns of the two genes were investigated in relation to cellobiose metabolism by the fungus. The cDNA sequences contained open reading frames of 1,389 base pairs (bp) (bgl1A) and 1,623 bp (bgl1B), encoding 462 and 530 amino acids, respectively. Although high sequence identity (65%) was observed between the deduced amino acid sequences of the two enzymes, an apparent difference was observed at the C-terminal region: BGL1B has a 63-amino acid extension, which has no similarity with any known protein. Both recombinant enzymes expressed in Escherichia coli showed hydrolytic activity towards several β-glycosidic compounds. However, the substrate recognition patterns of the two enzymes were quite different from each other. In particular, cellobiose was hydrolyzed more effectively by BGL1B than by BGL1A. The expression of the two genes in the fungus was monitored by reverse transcription-PCR, which showed that bgl1A was expressed constitutively in both glucose- and cellobiose-containing culture, whereas bgl1B was expressed in cellobiose culture but was repressed in glucose culture, possibly because of carbon catabolite repression. We conclude that BGL1B contributes to cellobiose metabolism during cellulose degradation by P. chrysosporium.
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Acknowledgements
The authors are grateful to Dr. Shinya Fushinobu (Department of Biotechnology, University of Tokyo) for valuable discussions about the kinetics of GH family 1 BGL. This research was supported by a Grant-in-Aid for Scientific Research to M. Samejima (number 17380102) from the Japanese Ministry of Education, Culture, Sports and Technology.
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Tsukada, T., Igarashi, K., Yoshida, M. et al. Molecular cloning and characterization of two intracellular β-glucosidases belonging to glycoside hydrolase family 1 from the basidiomycete Phanerochaete chrysosporium . Appl Microbiol Biotechnol 73, 807–814 (2006). https://doi.org/10.1007/s00253-006-0526-z
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DOI: https://doi.org/10.1007/s00253-006-0526-z