title: Biosynthetic origin of the carbon skeleton and oxygen atoms of the LL-F28249 alpha, a potent antiparasitic macrolide.
abstract: The biosynthesis of LL-F28249 alpha in a culture of Streptomyces cyaneogriseus has been studied using 13C, 14C and 18O labeled precursors. A complete 13C NMR spectrum of F28249 alpha has been assigned. Incorporation studies using 13C labeled precursors indicate that the carbon skeleton of F28249 alpha is derived from seven acetate, six propionate and one 2-methylpropionate units. The origin of the oxygen atoms of F28249 alpha has been examined by feeding [1-13C,18O2]acetate, [1-13C,18O2]propionate, [2-13C]acetate/18O2 and 18O2 separately to the fermentation culture and analyzing the resulting labeled LL-F28249 alpha samples by 13C NMR, electron impact MS and chemical ionization MS. Out of a total of eight oxygen atoms in LL-F28249 alpha, four oxygen atoms are derived from acetate, three from propionate and one from molecular oxygen.
authors.affiliation: Agricultural Research Division, American Cyanamid Company, Princeton, New Jersey 08540.
authors.forename: H R
authors.initials: HR
authors.lastname: Tsou
authors.forename: Z H
authors.initials: ZH
authors.lastname: Ahmed
authors.forename: R R
authors.initials: RR
authors.lastname: Fiala
authors.forename: M W
authors.initials: MW
authors.lastname: Bullock
authors.forename: G T
authors.initials: GT
authors.lastname: Carter
authors.forename: J J
authors.initials: JJ
authors.lastname: Goodman
authors.forename: D B
authors.initials: DB
authors.lastname: Borders
mesh_terms: D000900:Anti-Bacterial Agents; D000969:Antinematodal Agents / Q000378:metabolism*; D005285:Fermentation; D007783:Lactones / Q000096:biosynthesis*; D018942:Macrolides; D009682:Magnetic Resonance Spectroscopy; D013302:Streptomyces / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D000969:Antinematodal Agents; D007783:Lactones; D018942:Macrolides; C056041:nemadectin