5-ene-3beta-hydroxysteroid dehydrogenase ( 5-ene-3beta-hsd ) was found to have a different michaelis-menten constant ( km ) for each of three 5-ene-3beta-hydroxysteroids , ( pregnenolone ( p5 ) , 17alpha-hydroxypregnenolone ( 17alpha-p5 ) , and dehydroepiandrosterone ( dha ) but the constant for 17beta-hydroxysteroid dehydrogenase ( 17beta-hsd ) was similar for both the substrates androstendione ( a-dione ) and estradiol-17beta ( e2 ) .
C0373704
pregnenolone
C0376260
17alpha-hydroxypregnenolone