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• W2000122018 abstract "The 17 beta-hydroxy-C19-steroid dehydrogenase activity of adult male guinea pig kidney was separated into one isolated and two contiguous enzymatically pure fractions by submitting the cytosol to (NH4)2SO4 (40-80% saturation) precipitation, Sephadex G-75 filtration, and DEAE-Sephadex A-50 and CM-Sephadex C-50 chromatography. Further DEAE-Sephadex A-50 and CM-Sephadex C-50 chromatography separated eight isozymes, which were divided into four groups in accordance with their behavior on chromatography and mobility on gel electrophoresis. The molecular weights of the purified enzymes were identical by Sephadex filtration (33,000) and SDS gel electrophoresis (34,000). Two of the enzymes were separated by SDS gel electrophoresis into two subcomponents of 23,000 and 11,000 daltons. The amino acid composition, Km values, and coenzyme and substrate specificities of the enzymes (except one) were very similar. The pI values varied from 5.1-6.4 HgCl2 and PCMB inhibited enzyme activity, but prior addition of cysteine prevented the inhibition. The presence of phosphate or pyrophosphate greatly enhanced the trace of DPN+ -linked activity. The heterogeneity was due to at least two factors. Rapid (within 3 h) preparation of the cytosol in 7 mM 2-mercaptoethanol yielded one intense and one minor enzyme band on gel electrophoresis. Omission of the mercaptoethanol resulted in the appearance of three enzyme bands, which were reversible on the addition of 2-mercaptoethanol. Storage of the cytosol at 4 or -20 C in the absence or presence of 7 mM 2-mercaptoethanol and of the kidney before extraction also resulted in the exhibition of enzyme bands which were not reversible on addition of 2-mercaptoethanol. The purified enzymes exhibited only a single form on storage at -20 C with 2-mercaptoethanol, but multiple forms appeared when the mercaptoethanol was removed by dialysis. The multiple forms were reverted to a single form on addition of mercaptoethanol." @default.
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• W2000122018 date "1978-12-01" @default.
• W2000122018 modified "2023-09-27" @default.
• W2000122018 title "Purification and Properties of 17β-Hydroxy-C19-Steroid Dehydrogenases of Adult Male Guinea Pig Kidney*" @default.
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• W2000122018 doi "https://doi.org/10.1210/endo-103-6-2040" @default.
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