Читать книгу Snyder and Champness Molecular Genetics of Bacteria - Tina M. Henkin - Страница 194

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.