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. 1973 Dec;116(3):1191–1198. doi: 10.1128/jb.116.3.1191-1198.1973

Role of Methionine in Biosynthesis of Prodigiosin by Serratia marcescens

S M Hussain Qadri 1, Robert P Williams 1
PMCID: PMC246475  PMID: 4201771

Abstract

Methionine alone did not allow biosynthesis of prodigiosin (2-methyl-3-amyl-6-methoxyprodigiosene) in nonproliferating cells (NPC) of Serratia marcescens strain Nima. However, when methionine was added to NPC synthesizing prodigiosin in the presence of other amino acids, the lag period for synthesis of prodigiosin was shortened, an increased amount of the pigment was formed, and the optimal concentrations of the other amino acids were reduced. Less prodigiosin was synthesized when addition of methionine was delayed beyond 4 h. The specific activity of prodigiosin synthesized by addition of 14CH3-methionine was 40 to 50 times greater than that synthesized from methionine-2-14C or 14COOH-methionine. NPC of mutant OF of S. marcescens synthesized norprodigiosin (2-methyl-3-amyl-6-hydroxyprodigiosene), and the specific activity of this pigment synthesized in the presence of 14CH3-methionine was only 5 to 13 times greater than that synthesized from methionine-2-14C or 14COOH-methionine. A particulate, cell-free extract of mutant WF of S. marcescens methylated norprodigiosin to form prodigiosin. When the extract was added to NPC of mutant OF synthesizing norprodigiosin in the presence of 14CH3-methionine, the prodigiosin formed had 80% greater specific activity than the norprodigiosin synthesized in the absence of the extract. The C6 hydroxyl group of norprodigiosin was methylated in the presence of the extract and methionine. Biosynthesis of prodigiosin by NPC of strain Nima also was augmented by addition of S-adenosylmethionine. Various analogues of methionine such as norleucine, norvaline, ethionine, and α-methylmethionine did not affect biosynthesis of prodigiosin by NPC either in the presence or absence of methionine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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