Vilon: Molecular Structure

Molecular Structure#

Vilon is among the simplest possible bioactive peptides, consisting of just two amino acid residues connected by a single peptide bond.

Primary Structure#

Amino Acid Composition#

Vilon consists of two complementary amino acids:

• L-Lysine (K): A basic amino acid with a positively charged epsilon-amino group at physiological pH. Lysine is essential in human nutrition and is involved in protein synthesis, collagen cross-linking, and carnitine synthesis.

• L-Glutamic acid (E): An acidic amino acid with a negatively charged gamma-carboxyl group at physiological pH. Glutamate is the most abundant excitatory neurotransmitter in the brain and plays central roles in intermediary metabolism.

The combination of a basic and acidic residue creates a zwitterionic molecule with both positive and negative charges, resulting in good water solubility and potential for electrostatic interactions with nucleic acids and proteins.

Chemical Properties#

Charge Distribution#

At physiological pH (~7.4), vilon carries:

• Positive charge from the lysine epsilon-amino group (pKa ~10.5)
• Negative charge from the glutamate gamma-carboxyl group (pKa ~4.1)
• The N-terminal amino group and C-terminal carboxyl provide additional ionizable groups

This amphoteric character has been proposed to facilitate interactions with DNA and chromatin components, which may be relevant to vilon's reported epigenetic effects.

Size Considerations#

At 275 Da, vilon is remarkably small for a proposed bioactive peptide. For comparison:

The extremely small size is both an advantage (potential oral bioavailability, cell membrane penetration) and a challenge (rapid proteolytic degradation, questionable receptor specificity at this size).

Stability and Degradation#

As a simple dipeptide, vilon is susceptible to rapid hydrolysis by ubiquitous dipeptidases and aminopeptidases in blood and tissues. No formal stability or pharmacokinetic studies have been published. The in vivo half-life is expected to be very short (minutes) based on the general behavior of unprotected dipeptides in biological fluids.

The lack of published pharmacokinetic data is a significant gap in vilon research, as it raises fundamental questions about whether administered vilon reaches target tissues in intact form or whether its effects (if real) might be mediated by the constituent amino acids lysine and glutamic acid.

Relationship to Other Khavinson Peptides#

Vilon is part of a larger family of short peptide bioregulators developed by the Khavinson group, each proposed to target specific tissues:

The theoretical framework proposes that specific di- and tetrapeptide sequences can selectively regulate gene expression in target tissues, though the molecular basis for this tissue selectivity has not been definitively demonstrated.

Related Reading#

• Vilon overview and research guide
• Peptides similar to Vilon
• Vilon research evidence