title: The lipoidal derivatives of steroids as biosynthetic intermediates.
abstract: The lipoidal derivatives of [3H]pregnenolone, prepared biosynthetically, were converted, by incubation with a mitochondrial-microsomal fraction from adrenal cortical tissue, into lipoidal derivatives of 17-hydroxy-pregnenolone and of dehydroisoandrosterone, thus proving that these pregnenolone derivatives can serve as substrates for 17-hydroxylase and for the lyase enzyme that converts a C21-17-hydroxy-20-ketol into a C19-17-ketosteroid. Three synthetically prepared esters of pregnenolone, the oleate, the linoleate, and the arachidonate, were also hydroxylated at C-17 by a similar adrenal preparation. With the synthetic substrates, however, the corresponding esters of dehydroisoandrosterone were not formed.
mesh_terms: D000311:Adrenal Glands / Q000378:metabolism*; D000818:Animals; D002417:Cattle; D003460:Crystallization; D008861:Microsomes / Q000378:metabolism*; D008928:Mitochondria / Q000378:metabolism*; D011284:Pregnenolone / Q000031:analogs & derivatives* / Q000378:metabolism; D013254:Steroid 17-alpha-Hydroxylase / Q000378:metabolism*; D013250:Steroid Hydroxylases / Q000378:metabolism*
chemical_list: D011284:Pregnenolone; D013250:Steroid Hydroxylases; D013254:Steroid 17-alpha-Hydroxylase