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Biochem J. Feb 1, 1977; 161(2): 279–283.
PMCID: PMC1164505

Properties of the multiple forms of the soluble 17alpha-hydroxy steroid dehydrogenase of rabbit liver.

Abstract

The six forms of the 17alpha-hydroxy steroid dehydrogenase purified from rabbit liver cytosol have very similar physical properties. The molecular weights of all the enzymes were within 3% of the average mol.wt of 39 600. Only one of the six enzymes showed a significant difference in amino acid composition. All but one form of the 17alpha-hydroxy steroid dehydrogenases exhibited greater activities towards the androgen, epitestosterone, than towards oestrogen substrates. With oestrogen substrates one enzyme displayed a high specificity towards the substrate oestradiol-17alpha 3-glucuronide. This high activity was lost if the glucuronic acid moiety was removed or replaced by glucose or galacturonic acid. The other enzyme forms had approximately equal activity toward oestradiol-17alpha and its glucuronide or glucoside derivative. However, substitution of galacturonic acid at C-3 of oestradiol-17alpha substantially decreased the activity of all but one enzyme form.

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Selected References

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