Capped and gowned: A two-step approach can be used to site-specifically modify the 5'-cap of eukaryotic mRNAs. First, a trimethylguanosinesynthase variant recognizes the m(7)G cap structure and introduces bioorthogonal groups using S-adenosyl-L-methionine-based cosubstrates. Then, the enzymatically introduced reporter groups are further modified by thiol-ene or CuAAC click chemistry (see scheme).
Keywords: AdoMet analogues; click chemistry; mRNA; trimethylguanosinesynthase.
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