Biosynthetic convergence of salinosporamides A and B in the marine actinomycete Salinispora tropica.


[structure: see text] Feeding experiments with stable isotopes established that the potent 20S-proteasome inhibitors salinosporamide A and B are biosynthesized in the marine bacterium Salinispora tropica from three biosynthetic building blocks, namely, acetate, beta-hydroxy-2'-cyclohexenylalanine, and either butyrate or a tetrose-derived chlorinated… (More)


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