Method for removing n-terminal methionine

C - Chemistry – Metallurgy – 07 – K

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C07K 1/12 (2006.01) C12N 15/09 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2346064

A process for freeing a peptide having an optionally oxidized diketomethionine residue at the N-terminal or a salt thereof from the diketomethionine residue, characterized by reacting the peptide or salt with 3,4-diaminobenzoic acid or a salt thereof in the presence of acetic acid and sodium formate, formic acid and sodium formate, or formic acid and sodium acetate; and a process for preparing peptides free from N-terminal methionine residues or salts thereof.

L'invention concerne un procédé permettant de détacher un peptide comprenant un résidu dicétométhionine éventuellement oxydé sur l'extrémité N-terminale ou un sel de ce dernier, de ce résidu dicétométhionine. Ce procédé est caractérisé en ce qu'on fait réagir le peptide ou le sel avec un acide 3,4-diaminobenzoïque ou un sel de ce dernier en présence d'acide acétique et de formate de sodium, d'acide formique et de formate de sodium ou d'acide formique et d'acétate de sodium. L'invention concerne en outre un procédé permettant de préparer des peptides exempts de résidus de méthionine N-terminaux ou de sels de ces derniers.

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