a steroid monooxygenase of cylindrocarpon radicicola was found to catalyze oxygenative lactonization of 17-ketosteroid , androstenedione , to yield d-homo-17 alpha-oxasteroid , testololactone , i.e. , the androstenedione monooxygenase reaction , in addition to catalyzing the progesterone monooxygenase reaction .
C0000167
17-ketosteroid
C0002860
androstenedione