Inhibition of pyridine-nucleotide-dependent enzymes by pyrazoles. Synthesis and enzymology of A novel A-ring pyrazole steroid
作者:Dennis A. Holt、Mark A. Levy、Martin Brandt、Brian W. Metcalf
DOI:10.1016/0039-128x(86)90004-8
日期:1986.9
A novel A-ring pyrazole steroid, 2,3-bisaza-A-nor-1,5(10)-estradien-17 beta-ol (3), was synthesized as a potential inhibitor of steroidal NAD(P)H-dependent oxidoreductases. Compound 3 proved to be a potent inhibitor of 3(17)beta-hydroxysteroid dehydrogenase (from P. testosteroni) exhibiting a Ki of 90 +/- 20 nM. The activities of 3 alpha,20 beta-hydroxysteroid dehydrogenase (from S. hydrogenans), steroid-5 alpha-reductase (from rat prostate), and 3 alpha-hydroxysteroid dehydrogenase (from rat liver) were unaffected by pyrazole 3. Dead end inhibition studies indicate an ordered binding of cofactor prior to substrate or pyrazole inhibitor.