Abstract
When Phanerochaete chrysosporium was grown with laminarin (a β-1,3/1,6-glucan) as the sole carbon source, a β-1,3-glucanase with a molecular mass of 36 kDa was produced as a major extracellular protein. The cDNA encoding this enzyme was cloned, and the deduced amino acid sequence revealed that this enzyme belongs to glycoside hydrolase family 16; it was named Lam16A. Recombinant Lam16A, expressed in the methylotrophic yeast Pichia pastoris, randomly hydrolyzes linear β-1,3-glucan, branched β-1,3/1,6-glucan, and β-1,3-1,4-glucan, suggesting that the enzyme is a typical endo-1,3(4)-β-glucanase (EC 3.2.1.6) with broad substrate specificity for β-1,3-glucans. When laminarin and lichenan were used as substrates, Lam16A produced 6-O-glucosyl-laminaritriose (β-d-Glcp-(1–>6)-β-d-Glcp-(1–>3)-β-d-Glcp-(1–>3)-d-Glc) and 4-O-glucosyl-laminaribiose (β-d-Glcp-(1–>4)-β-d-Glcp-(1–>3)-d-Glc), respectively, as one of the major products. These results suggested that the enzyme strictly recognizes β-d-Glcp-(1–>3)-d-Glcp at subsites −2 and −1, whereas it permits 6-O-glucosyl substitution at subsite +1 and a β-1,4-glucosidic linkage at the catalytic site. Consequently, Lam16A generates non-branched oligosaccharide from branched β-1,3/1,6-glucan and, thus, may contribute to the effective degradation of such molecules in combination with other extracellular β-1,3-glucanases.
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Acknowledgement
This research was supported by a Grants-in-Aid for Scientific Research to M.S. (no. 17380102) and K.I. (no. 15780206) from the Japanese Ministry of Education, Culture, Sports and Technology, and a Research Fellowship to R.K. (No. 11536) from the Japan Society for the Promotion of Science.
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Kawai, R., Igarashi, K., Yoshida, M. et al. Hydrolysis of β-1,3/1,6-glucan by glycoside hydrolase family 16 endo-1,3(4)-β-glucanase from the basidiomycete Phanerochaete chrysosporium . Appl Microbiol Biotechnol 71, 898–906 (2006). https://doi.org/10.1007/s00253-005-0214-4
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DOI: https://doi.org/10.1007/s00253-005-0214-4