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Precursors and proposed pathway for roseobacticide biosynthesis. (A) Roseobacticide A may be synthesized from two algal molecules (1 and 4) and from the algal growth promoter (3) used during mutualism. (B) Phe may be converted to 3 and 5-cycloheptene-1,3-dione (14) via pathway (a), previously described.17 Tyr may be provided by a putative TAL (PGA1_c36340, reaction b) or from Phe (reaction c). See text for a description.
