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Class 1 or classical (canonical) intein splicing (Figure 5a) involves (1) an (N-S/N-O) acyl shift converting the peptide bond of N-terminal splice junction to a (thio)ester linkage, (2) a transesterification reaction to form a branched intermediate, (3) Asn cyclization to resolve the branched intermediate by cleavage of C-terminal splice junction and (4) a second (S-N/O-N) acyl shift to ligate the two extein segments by an amide bond formation [3,79]

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Structural and mechanistic insights into the oxy form of tyrosinase from molecular dynamics simulations