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Addition of α-1,3-glucan-binding domains to α-1,3-glucanase Agn1p from  Schizosaccharomyces pombe enhances hydrolytic activity of insoluble α-1,3-glucan. | LitMetric

AI Article Synopsis

Article Abstract

The glycoside hydrolase (GH) 71 α-1,3-glucanase (Agn1p) from Schizosaccharomyces pombe consists of an N-terminal signal sequence and a catalytic domain. Meanwhile, the GH87 α-1,3-glucanase (Agl-KA) from Bacillus circulans KA-304 consists of an N-terminal signal sequence, a first discoidin domain (DS1), a carbohydrate-binding module family 6 (CBM6), a threonine and proline repeat linker (TP), a second discoidin domain (DS2), an uncharacterized domain, and a catalytic domain. DS1, CBM6, and DS2 exhibit α-1,3-glucan binding activity. This study involved genetically fusing TP, DS1, CBM6, TP, and DS2 to the C-terminus of Agn1p, generating the fusion enzyme Agn1p-DCD. The fusion enzyme was then expressed in Escherichia coli and purified from the cell-free extract. Agn1p-DCD and Agn1p exhibited similar characteristics, such as optimal pH, optimal temperature, pH stability, and thermostability. Insoluble α-1,3-glucan (1%) hydrolyzing assay showed that Agn1p-DCD and Agn1p released approximately 7.6 and 5.0 mM of reducing sugars, respectively, after 48 h of reaction. Kinetic analysis and an α-1,3-glucan binding assay indicated that the addition of DS1, CBM6, and DS2 enhanced the affinity of Agn1p for α-1,3-glucan. Moreover, Agn1p-DCD contributed to enhancing the fungal growth inhibition activity when combined with a mixture of GH19 chitinase and GH16 β-1,3-glucanase.

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http://dx.doi.org/10.2323/jgam.2024.02.001DOI Listing

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