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Title: Biosynthesis of the 3,4-dihydroxybenzoate moieties of petrobactin by Bacillus anthracis
Authors: Koppisch, A.T.
Hotta, K. 
Fox, D.T.
Ruggiero, C.E.
Kim, C.-Y. 
Sanchez, T.
Iyer, S.
Browder, C.C.
Unkefer, P.J.
Unkefer, C.J.
Issue Date: 1-Aug-2008
Citation: Koppisch, A.T., Hotta, K., Fox, D.T., Ruggiero, C.E., Kim, C.-Y., Sanchez, T., Iyer, S., Browder, C.C., Unkefer, P.J., Unkefer, C.J. (2008-08-01). Biosynthesis of the 3,4-dihydroxybenzoate moieties of petrobactin by Bacillus anthracis. Journal of Organic Chemistry 73 (15) : 5759-5765. ScholarBank@NUS Repository.
Abstract: (Chemical Equation Presented) The biosynthesis of the 3,4-dihydroxybenzoate moieties of the siderophore petrobactin, produced by B. anthracis str. Sterne, was probed by isotopic feeding experiments in iron-deficient media with a mixture of unlabeled and D-[13C6]glucose at a ratio of 5:1 (w/w). After isolation of the labeled siderophore, analysis of the isotopomers was conducted via one-dimensional 1H and 13C NMR spectroscopy, as well as 13C-13C DQFCOSY spectroscopy. Isotopic enrichment and 13C-13C coupling constants in the aromatic ring of the isolated siderophore suggested the predominant route for the construction of the carbon backbone of 3,4-DHB (1) involved phosphoenol pyruvate and erythrose-4-phosphate as ultimate precursors. This observation is consistent with that expected if the shikimate pathway is involved in the biosynthesis of these moieties. Enrichment attributable to phosphoenol pyruvate precursors was observed at C1 and C6 of the aromatic ring, as well as into the carboxylate group, while scrambling of the label into C2 was not. This pattern suggests 1 was biosynthesized from early intermediates of the shikimate pathway and not through later shikimate intermediates or aromatic amino acid precursors. © 2008 American Chemical Society.
Source Title: Journal of Organic Chemistry
ISSN: 00223263
DOI: 10.1021/jo800427f
Appears in Collections:Staff Publications

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