Melting of DNA double strand after binding to geroprotective tetrapeptide.

Mechanism / theoretical grounding — not clinical validation.

Khavinson VKh, Solovyov AY, Shataeva LK. Bull Exp Biol Med. 2008.

Organ: pineal-circadian · Type: in-vitro · Peptides: Epitalon

PMID: 19526107

Binding of Ala-Glu-Asp-Gly to poly(dA-dT) duplex DNA lowered the reported melting temperature from 69.5 °C to 28 °C on a saturation isotherm — biophysical melting, not a cell or clinical study.

Editorial summary of a 2008 original article in Bulletin of Experimental Biology and Medicine. Thermodynamics of a synthetic DNA duplex with Ala-Glu-Asp-Gly. Public pages cite PubMed only. Read the paper: PMID 19526107.

Methods

The authors present a saturation isotherm for the hyperchromic effect of DNA [poly(dA-dT):poly(dA-dT)] interacting with Ala-Glu-Asp-Gly (Epitalon). They compare melting temperature and enthalpy of the free duplex with those of the DNA–peptide complex. Instrument settings belong in the primary text.

Findings

This paper is mechanistic or modeling evidence, not a clinical trial. They report that the free DNA double strand melts (strands separate) at 69.5 °C with a larger enthalpy increase (976.4 kJ/mol b.p.) than the DNA–peptide complex (28 °C and 444.6 kJ/mol b.p.). They interpret those thermodynamic parameters as a natural mechanism of DNA–regulatory-peptide interaction.

Synthetic poly(dA-dT) melting is not a gene-expression result in cells or in people. Follow the PMID.