title: Mixed culture bioconversion of 16-dehydropregnenolone acetate to androsta-1,4-diene-3,17-dione: optimization of parameters.
abstract: Bioconversion of 16-dehydropregnenolone acetate (16-DPA) to androsta-1,4-diene-3,17-dione (ADD), an intermediate for the production of female sex hormones, by mixed culture of Pseudomonas diminuta MTCC 3361 and Comamonas acidovorans MTCC 3362 is reported. Various physicochemical parameters for the bioconversion of 16-DPA to ADD have been optimized in shake flask cultures. Nutrient broth inoculated with actively growing co-culture proved ideal for bacterial growth and bioconversion. A temperature range of 35-40 degrees C was most suitable; higher or lower temperatures adversely affected the bioconversion. Dimethylformamide below 2% concentration was the most suitable carrier solvent. Maximum conversion was recorded at 0.5 mg mL(-1) 16-DPA. A pH of 5.0 yielded a peak conversion of 62 mol % in 120 h incubation period. Addition of 9alpha-hydroxylase inhibitors failed to prevent further breakdown of ADD to nonsteroidal products. 16-DPA conversion in a 5 L fermenter followed a similar trend.
authors.affiliation: Applied Microbiology Laboratory, School of Life Sciences, Devi Ahilya University, Takshashila Campus, Khandwa Road, Indore 452 017, India.
authors.forename: Tushar
authors.initials: T
authors.lastname: Banerjee
authors.forename: Aniruddha
authors.initials: A
authors.lastname: Shukla
authors.forename: Kirti
authors.initials: K
authors.lastname: Shinde
authors.forename: Shridhar
authors.initials: S
authors.lastname: Patil
mesh_terms: D000730:Androstadienes / Q000378:metabolism*; D001711:Biotransformation; D018929:Cell Culture Techniques / Q000379:methods; D018920:Coculture Techniques / Q000379:methods*; D020605:Delftia acidovorans / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D004126:Dimethylformamide / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D011282:Pregnenediones / Q000378:metabolism*; D011549:Pseudomonas / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D011786:Quality Control
chemical_list: C469666:3-acetoxypregna-5,16-diene-20-one; D000730:Androstadienes; D011282:Pregnenediones; C006573:1,4-androstadiene-3,17-dione; D004126:Dimethylformamide