Volume 220, Issue 1 pp. 67-73

Novel pyrazine metabolites found in polymyxin biosynthesis by Paenibacillus polymyxa

Hans C Beck

Corresponding Author

Hans C Beck

CelCom, Department of Biochemistry and Molecular Biology, University of Southern Denmark-Odense, DK-5230 Odense M, Denmark

Biotechnological Institute, Holbergsvej 10, DK-6000 Kolding, Denmark

*Corresponding author. Tel.: +45 75520433; Fax: +45 75529989, E-mail address: [email protected]Search for more papers by this author
Anne M Hansen

Anne M Hansen

Biotechnological Institute, Holbergsvej 10, DK-6000 Kolding, Denmark

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Frants R Lauritsen

Frants R Lauritsen

CelCom, Department of Biochemistry and Molecular Biology, University of Southern Denmark-Odense, DK-5230 Odense M, Denmark

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First published: 09 January 2006
Citations: 14

Abstract

A complex mixture of methyl-branched alkyl-substituted pyrazines was found in the growth medium of the polymyxin-producing bacterium Paenibacillus polymyxa, and of these, seven are new natural compounds. A total of 19 pyrazine metabolites were identified. The dominant metabolite was 2,5-diisopropylpyrazine as identified using a combination of high-resolution mass spectrometry, 1H- and 13C-nuclear magnetic resonance, gas chromatography-mass spectrometry as well as co-elution with an authentic standard. Its biosynthesis was correlated with growth and production was strongly stimulated by valine supplementation. The other pyrazine metabolites, all related pyrazines with either one, two or three alkyl substituents, were identified by means of their mass spectral data and/or co-elution with authentic standards.

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