Mismethylate

We did find that one of tbe Salmonella genes, cbiF, was capable of 'mismethylating' precorrin-3 at the 1 l-position, ie out of the natural order, to yield a tetramethyl pyrrocorphin

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CysG is a homodimer with a subunit Mᵣ of 50,000, which, in addition to catalyzing methylation at C-2 and C-7, can also mismethylate precorrin 2 at C-12 to afford a trimethylpyrrocorphin derailment product.

Source: wiktionary

M. jannaschii Nep mismethylates T-arm resembling RNAs.

Source: wiktionary

Biosynthesis of Mismethylated Analogs of Cobalamin

Source: wiktionary