Free Modifications: N-Terminal Acetylation and C-Terminal Amidation

Chemically synthesized peptides have free amino and carboxy termini. Please state any need for N-terminal acetylation or C-terminal amidation during the ordering process. It is impossible to perform these modifications after synthesis.

N-terminal acetylation and C-terminal amidation reduce the overall charge of a peptide so that the solubility may decrease. But the stability of the peptide could be increased because the terminal acetylation/amidation will generate a closer mimic of the native protein. Thus these modifications may increase the biological activity of a peptide.

Advantages:

• The altered peptide ends are uncharged, so modified peptides more closely mimic the native protein. This increases their ability to enter cells. We recommend modification for intracellular, in-vivo assays and in-vitro functional studies.
• The modifications increase the metabolic stability of the peptides and their ability to resist enzymatic degradation by aminopetidases, exopeptidases, and synthetase. The modified peptides can then be used as substrates in enzyme assays.
• Amidation not only enhances the activity of peptide hormones, it also prolongs their shelf life.
• The changes reduce the influence of charged C- or N-termini during ELISA binding assays.

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