Steroids excreted in urine by neonates with 21-hydroxylase deficiency: Characterization, using GC–MS and GC–MS/MS, of the D-ring and side chain structure of pregnanes and pregnenes
作者:Sofia Christakoudi、David A. Cowan、Norman F. Taylor
DOI:10.1016/j.steroids.2009.09.011
日期:2010.1
conditions, were used together to determine the structure of the D-ring and the sidechain of 20-oxo and 20-hydroxy pregnane(ene)s without oxo groups on the A-, B-, and C-ring. All possible combinations of D-ring and sidechain configuration were considered. Most fragmentations could be interpreted as partial or complete D-ring cleavages with loss of the sidechain, aided by comparison with spectra of deuterated
Mechanism of 17α,20-Lyase and New Hydroxylation Reactions of Human Cytochrome P450 17A1
作者:Francis K. Yoshimoto、Eric Gonzalez、Richard J. Auchus、F. Peter Guengerich
DOI:10.1074/jbc.m116.732966
日期:2016.8
(P450) reactions can involve C-C bond cleavage, and several of these are critical in steroid and sterol biosynthesis. The mechanisms of P450s 11A1, 17A1, 19A1, and 51A1 have been controversial, in the context of the role of ferric peroxide (FeO2-) vs. perferryl (FeO3+, Compound I) chemistry. We reinvestigated the 17alpha-hydroxyprogesterone and 17alpha-hydroxypregnenolone 17alpha,20-lyase reactions of