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. 2019 Oct 22;17(10):594. doi: 10.3390/md17100594

Figure 5.

Figure 5

Two mechanisms of pendant alkylation of polyketides. (A) The upper reaction uses methylmalonic acid as a building block, while the lower one shows a methyl group derived from SAM. (B) A proposed mechanism for the introduction of a methyl side chain from a malonate unit via an HMG-CoA based enzyme.