Journal
CHEMISTRY & BIOLOGY
Volume 18, Issue 9, Pages 1102-1112Publisher
CELL PRESS
DOI: 10.1016/j.chembiol.2011.07.009
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Funding
- United States National Institutes of Health [R01 GM49338-18, R01 GM086258]
- Damon Runyon Cancer Research Foundation [DRG-2002-09]
- National Institutes of Health [1K99 GM097096-01]
- NCI Cancer Center [NIH 5 P30 CA06516]
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2,5-Dihydrophenylalanine (H(2)Phe) is a multipotent nonproteinogenic amino acid produced by various Actinobacteria and Gammaproteobacteria. Although the metabolite was discovered over 40 years ago, details of its biosynthesis have remained largely unknown. We show here that L-H(2)Phe is a secreted metabolite in Photorhabdus luminescens cultures and a precursor of a recently described 2,5-dihydrostilbene. Bioinformatic analysis suggested a candidate gene cluster for the processing of prephenate to H(2)Phe, and gene knockouts validated that three adjacent genes plu3042-3044 were required for H(2)Phe production. Biochemical experiments validated Plu3043 as a nonaromatizing prephenate decarboxylase generating an endocyclic dihydro-hydroxyphenylpyruvate. Plu3042 acted next to transaminate the Plu3043 product, precluding spontaneous exocyclic double-bond isomerization and yielding 2,5-dihydrotyrosine. The enzymatic products most plausibly on path to H(2)Phe illustrate the versatile metabolic rerouting of prephenate from aromatic amino acid synthesis to antibiotic synthesis.
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