The supernatant obtained by centrifugation of Triton N-101-treated freeze-dried rat testicular microsomal fraction at 105000gav. for 2h transformed progesterone into testosterone via 17-hydroxypregn-4-ene-3,20-dione and androst-4-ene-3,17-dione. Hydroxylation at C-17 of 3β-hydroxypregn-5-en-20-one and deoxycorticosterone was not observed. Non-haem iron protein, cytochrome P-450 and material with NADPH dehydrogenase activity were precipitated by 40% saturation of the supernatant with ammonium sulphate; however, it was not possible to establish the participation of these substances in the 17α-hydroxylase and side-chain-cleavage activities also present in the precipitate. The results of gel-filtration chromatography indicated that the Triton N-101 extract consisted primarily of a suspension of small particles of microsomes and that the progesterone 17-hydroxylase and the 17-hydroxypregn-4-ene-3,20-dione side-chain-cleavage enzyme were not in true solution.
Studies on an extract of rat testicular microsomal fraction that catalyses the transformation of progesterone into 17-hydroxyprogesterone and androgens
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Henry C. Ford, Vincent J. O'Donnell; Studies on an extract of rat testicular microsomal fraction that catalyses the transformation of progesterone into 17-hydroxyprogesterone and androgens. Biochem J 1 June 1971; 123 (1): 105–116. doi: https://doi.org/10.1042/bj1230105
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