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- W1964025228 abstract "Human seminal plasma contain two forms of beta-glucuronidase (beta-D-glucuronidase glucuronosohydrolase, EC 3.2.1.31) which are present in the ratio of 4:1. The major form of beta-glucuronidase with a slow moving band in electrophoresis was purified to homogeneity as revealed by polyacrylamide gel electrophoresis, double immunodiffusion and immunoelectrophoresis. The major form of beta-glucuronidase shows dual optimum pH at 4.3 and 4.7 with a dip in the activity at pH 4.5. The Km of this form of beta-glucuronidase is dependent on pH and was found to be 0.95, 3.08 and 0.67 mM at pH 4.4, 4.5 and 4.7, respectively. The major form of beta-glucuronidase from seminal plasma is stable at 55 degrees C for 30 min but it denatures at 65 degrees C. Heat denaturation is faster at acidic pH (4.7) than at alkaline pH (7.8). However, the activity of enzyme increased linearly with increase in temperature up to 70 degrees C during incubation with substrate. Cu, Ag, Hg and Ni salts inhibited enzyme activity significantly at 0.1 and 1.0 mM concentration, but the inhibition of HgCl2 was protected by cysteine. 1,4-D-Saccharic acid lactone and ascorbic acid inhibited seminal beta-glucuronidase competitively, yielding Ki values of 1.7 . 10(-3) mM and 10.3 mM, respectively. Though fructose and mannose also showed significant inhibition of beta-glucuronidase at 10-100 mM, glucose did not show any effect. The molecular weight of the major form of beta-glucuronidase was found to be 279 000, and it appears to be composed of four subunits each having a molecular weight of 74 000." @default.
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- W1964025228 date "1983-11-01" @default.
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- W1964025228 title "Isolation and characterization of the major form of β-glucuronidase from human seminal plasma" @default.
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- W1964025228 doi "https://doi.org/10.1016/0167-4838(83)90185-1" @default.
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