In vitro evolution of a self-alkylatlng ribozyme

RNA enzymes are postulated to have catalysed all chemical reactions in the earliest living cells. This idea is now investigated in a search for alkyl transferases from a pool of random sequence RNAs. Selection for self-biotinylation yields a transfer RNA-like ribozyme that efficiently catalyses carbon–nitrogen bond formation. Ribozymes can thus promote reactions other than those involving the RNA sugar–phosphate backbone, suggesting that RNA may be capable of a broad range of catalytic activities.

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