OptiOral CareBioregulator Dental System

Dual-Terminus Modification: Why Ac-X-NH₂ for Oral Delivery

The oral environment contains aminopeptidases and carboxypeptidases that rapidly cleave native peptide sequences from both the N- and C-termini, limiting therapeutic exposure to minutes. The Ac-X-NH₂ analogs in OptiOral Care formulations carry N-terminal acetylation and C-terminal amidation — modifications that block both proteolytic attack points and extend active compound half-life from minutes to hours. This is the key innovation enabling therapeutic tissue exposure from a non-injectable oral format.

The proteolytic problem

Salivary aminopeptidases cleave peptide bonds at the N-terminus. Salivary carboxypeptidases cleave at the C-terminus. Native peptide sequences exposed to the oral environment have measured half-lives in the range of minutes — insufficient for therapeutic tissue exposure. This is why injectable peptide bioregulators have historically been the only viable delivery format.

N-terminal acetylation

Acetylation of the alpha-amino group at the N-terminus replaces the free amine with an acetyl group, blocking the substrate recognition pocket of aminopeptidases. The peptide becomes a non-substrate for the most active class of N-terminal proteases in saliva.

C-terminal amidation

Amidation of the alpha-carboxyl group at the C-terminus replaces the free carboxyl with a primary amide, blocking carboxypeptidase recognition. Combined with N-terminal acetylation, both proteolytic attack vectors are blocked simultaneously.

Net result and OptiOral Care application

The Ac-X-NH₂ analogs — Ac-AEDG-NH₂ and Ac-KE-NH₂ — exhibit measured half-life extension from minutes to hours in oral environment exposure. This enables sustained therapeutic peptide concentration during a 60–90 second mucosal contact window followed by extended subepithelial tissue exposure. Without dual-terminus modification, oral peptide bioregulator delivery would not be feasible at therapeutic concentrations.

Citations

  1. Salivary protease and peptidase characterization. Oral biology and proteomics literature.
  2. N-acetylation and C-amidation as proteolytic stability modifications: peptide chemistry literature on stability strategies.
Back to LibraryJoin the Early Access List