TY - JOUR
T1 - Characterization of the 3α-hydroxysteroid dehydrogenase of dog prostate
AU - Jacobi, Günther H.
AU - Moore, Ronald J.
AU - Wilson, Jean D.
N1 - Funding Information:
Acknowledgements-JDarc.o bi was the recipienot f doc-toralf ellowshiJpa 277/lf romt heD eutschFeo rschungsge-meinschaHft.is presenat ddresiss Departmenotf Urology, Schoolo f Medicine,J ohannesG utenberg-Universiotyf MainzD -6500M ainz,L angenbeckstra1ss,G ee rmanyT.h e work was aidedb y grant AM03892f rom the National In-stituteso f Health. Mary B. Neal provided able technical assistance.
PY - 1977/7
Y1 - 1977/7
N2 - The effects of 31 different steroids on the formation of 3α-androstanediol from [1,2-3H]-dihydrotestosterone were assessed in both microsomal and cytosolic fractions of dog prostate. Several features of the substrate specificity of the reaction were deduced from these studies. First, 4-ene-3-keto steroids and 5β-reduced steroids were weak or inactive inhibitors of the reaction. Second, oxo substitution at C6 or C11 abolished the inhibitory ability of 5α-reduced steroids. Third, 2α-halogenated androstanes were good inhibitors, and, in particular, the 2α-bromo steroids (2α-bromo-androstanedione and -dihydrotestosterone) were at least five fold more inhibitory than the parent androstane. Fourth, the 3-keto function of the steroid nucleus is critical whereas a 17-oxo-group (hydroxyl or keto) is not essential. Fifth, the relative inhibition of the microsomal and cytosolic enzyme correlated closely, a finding compatible with enzymic identity of the two intracellular fractions.
AB - The effects of 31 different steroids on the formation of 3α-androstanediol from [1,2-3H]-dihydrotestosterone were assessed in both microsomal and cytosolic fractions of dog prostate. Several features of the substrate specificity of the reaction were deduced from these studies. First, 4-ene-3-keto steroids and 5β-reduced steroids were weak or inactive inhibitors of the reaction. Second, oxo substitution at C6 or C11 abolished the inhibitory ability of 5α-reduced steroids. Third, 2α-halogenated androstanes were good inhibitors, and, in particular, the 2α-bromo steroids (2α-bromo-androstanedione and -dihydrotestosterone) were at least five fold more inhibitory than the parent androstane. Fourth, the 3-keto function of the steroid nucleus is critical whereas a 17-oxo-group (hydroxyl or keto) is not essential. Fifth, the relative inhibition of the microsomal and cytosolic enzyme correlated closely, a finding compatible with enzymic identity of the two intracellular fractions.
UR - http://www.scopus.com/inward/record.url?scp=0017625299&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0017625299&partnerID=8YFLogxK
U2 - 10.1016/0022-4731(77)90002-4
DO - 10.1016/0022-4731(77)90002-4
M3 - Article
C2 - 592799
AN - SCOPUS:0017625299
SN - 0022-4731
VL - 8
SP - 719
EP - 723
JO - Journal of Steroid Biochemistry
JF - Journal of Steroid Biochemistry
IS - 7
ER -