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Radical-SAM-enzymes catalyze Cα-epimerization and C-methylation. A) The proteusins are a family of Cα-epimerized peptides.21 B) Bottromycin A2 contains multiple C-methylations, an O-methylation, and a nonenzymatic Cα-epimerization.24 C) Chemical38 and solution structure (PDB ID 2RQO)30 of polytheonamide B.
