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REMOVAL OF THE FORMYL GROUP AND THE N-TERMINAL METHIONINE

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Normally, polypeptides do not have a formyl group attached to their N termini. In fact, they usually do not even have methionine as their N-terminal amino acid. The formyl group is removed from the completed polypeptide by a special enzyme called peptide deformylase (Figure 2.31). The N-terminal methionine or entire N-formylmethionine is also often removed by an enzyme called methionine aminopeptidase, so that methionine is usually not the N-terminal amino acid in a mature polypeptide.

Snyder and Champness Molecular Genetics of Bacteria

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