Protein splicing: evidence for an N-O acyl rearrangement as the initial step in the splicing process.

Abstract excerpt

Protein splicing involves the self-catalyzed formation of a branched intermediate, which then resolves into the excised intervening sequence and the spliced protein. A possible mechanism for branched intermediate formation is an N-O rearrangement of the peptide bond involving the amino group of the conserved serine/cysteine residue at the upstream splice junction to yield a linear peptide ester intermediate. This...

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