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- W2400697989 abstract "A novel ginsenoside-hydrolyzing beta-glucosidase was purified from Paecilomyces Bainier sp. 229 by a combination of QSepharose FF, phenyl-Sepharose CL-4B, and CHT ceramic hydroxyapatite column chromatographies. The purified enzyme was a monomeric protein with a molecular mass estimated to be 115 kDa. The optimal enzyme activity was observed at pH 3.5 and 60oC. It was highly stable within pH 3-9 and at temperatures lower than 55oC. The enzyme was specific to beta-glucoside. The order of enzyme activities against different types of beta-glucosidic linkages was beta-(1- 6)>beta-(1-2)>beta-(1-4). The enzyme converted ginsenoside Rb1 to CK specifically and efficiently. An 84.3% amount of ginsenoside Rb1, with an initial concentration of 2 mM, was converted into CK in 24 h by the enzyme at 45 degrees and pH 3.5. The hydrolysis pathway of ginsenoside Rb1 by the enzyme was Rb1-->Rd-->F2-->CK. Five tryptic peptide fragments of the enzyme were identified by a newly developed de novo sequencing method of post-source decay (PSD) matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. By comparing the five identified peptide sequences with the NCBI database, this purified beta-glucosidase proves to be a new protein that has not been reported before." @default.
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- W2400697989 date "2008-06-01" @default.
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- W2400697989 title "Purification and properties of a novel beta-glucosidase, hydrolyzing ginsenoside Rb1 to CK, from Paecilomyces Bainier." @default.
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