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(A) Proposed biosynthetic pathway of fusaric acid. Fub7 is a PLP-dependent enzyme that catalyzes 𝛾-replacement C-C bond formation. The mechanism is similar to CndF. (B) Simplified biosynthetic pathway of curvulamine, highlighting a bifunctional PLP-dependent enzyme, CauB, that can catalyze Claisen condensation to release PKS product as well as hydroxylation on the substrate.
