title: Control of misincorporation of de novo synthesized norleucine into recombinant interleukin-2 in E. coli.
abstract: Interleukin-2 produced from a recombinant E. coli was found to contain as much as 19% norleucine in place of methionine in a minimal medium fermentation. Medium supplementation experiments and use of a leucine-requiring mutant host strain indicated the origin of norleucine to be de novo biosynthesis by reactions involving the enzymes of the leucine biosynthetic pathway. The misincorporation was highly suppressed by addition of either L-leucine or L-methionine to the fermentation and completely suppressed by adding both amino acids.
authors.affiliation: Amgen, Inc., Thousands Oaks, CA 91320.
authors.forename: L B
authors.initials: LB
authors.lastname: Tsai
authors.forename: H S
authors.initials: HS
authors.lastname: Lu
authors.forename: W C
authors.initials: WC
authors.lastname: Kenney
authors.forename: C C
authors.initials: CC
authors.lastname: Curless
authors.forename: M L
authors.initials: ML
authors.lastname: Klein
authors.forename: P H
authors.initials: PH
authors.lastname: Lai
authors.forename: D M
authors.initials: DM
authors.lastname: Fenton
authors.forename: B W
authors.initials: BW
authors.lastname: Altrock
authors.forename: M B
authors.initials: MB
authors.lastname: Mann
mesh_terms: D000614:Aminocaproates / Q000378:metabolism*; D003488:Cyanogen Bromide; D004926:Escherichia coli / Q000187:drug effects / Q000378:metabolism*; D005246:Feedback; D005285:Fermentation; D007370:Interferon Type I / Q000378:metabolism; D007376:Interleukin-2 / Q000096:biosynthesis*; D007930:Leucine / Q000378:metabolism / Q000494:pharmacology; D008715:Methionine / Q000378:metabolism / Q000494:pharmacology; D009154:Mutation; D009646:Norleucine / Q000096:biosynthesis / Q000378:metabolism*; D011994:Recombinant Proteins / Q000096:biosynthesis*
chemical_list: D000614:Aminocaproates; D007370:Interferon Type I; D007376:Interleukin-2; D011994:Recombinant Proteins; D009646:Norleucine; D008715:Methionine; D007930:Leucine; D003488:Cyanogen Bromide