title: Microbial transformation of dihydrosarsasapogenin with Mycobacterium sp.
abstract: Microbial transformation of sarsasapogenin (1) with Mycobacterium sp. (NRRL B-3805) gave 25(S)-neospirost-4-en-3-one (2) as the sole product in 62% yield. Incubation of dihydrosarsasapogenin (3) led to the isolation of seven products in 0.5 (4), 6.6 (5), 5 (6), 16 (7), 1 (8), 1 (9), and 4.5% (10) yields, respectively, while 15% of 3 was recovered. Among these products, 8 and 9 were C22 steroids, and 10 was a C19 steroid. Isolation of these C19 and C22 steroids indicated that this microorganism is capable of cleaving the ether linkage between C-16 and C-22 in 3. In addition, 12 alpha-hydroxylation was also observed in all these three metabolites.
authors.affiliation: School of Pharmacy, College of Medicine, National Taiwan University, Taipei, Republic of China.
authors.forename: S S
authors.initials: SS
authors.lastname: Lee
authors.forename: J L
authors.initials: JL
authors.lastname: Yan
authors.forename: G Y
authors.initials: GY
authors.lastname: Lin
authors.forename: K C
authors.initials: KC
authors.lastname: Wang
mesh_terms: D001711:Biotransformation; D006900:Hydroxylation; D009682:Magnetic Resonance Spectroscopy; D009161:Mycobacterium / Q000378:metabolism*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013150:Spirostans / Q000378:metabolism*
chemical_list: D013150:Spirostans; C046297:sarsasapogenin