Melting of oligodeoxynucleotides with various structures

D. B. Naritsin, Yu L. Lyubchenko

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Effects of DNA fragments end structures on their melting profiles were studied experimentally and theoretically. We examined melting of hairpins and dumbbells obtained from 62- bp-long linear DNA duplex which is a perfect palindromic sequence. To fit theoretical melting profile to experimental ones additional theoretical parameters were incorporated into the standard statistical mechanical helix-coil transition theory. From comparison theoretical and experimental melting profiles theoretical parameters connected with end- structure effects were evaluated. Analysis revealed the stabilization effect of the hairpin loops and helix ends with respect to DNA duplex melting. Both type of ends make melting these oligodeoxynucleotides more cooperative than predicted by the standard helix-coil transition theory. At low ionic strength ([Na+] < 0.04 M) this effect becomes so pronounced that melting of the DNA duplexes 30-40 bp-long conforms to the two state model.From the analysis experimental data obtained for dumbbell structures loop-weighting factor for single-stranded loop consisting of 132 nucleotides was determined. This parameter decreases 10 times with the ionic strength decreasing by an order of magnitude from 0.2 to 0.02 M Na+.

Original languageEnglish (US)
Pages (from-to)813-825
Number of pages13
JournalJournal of Biomolecular Structure and Dynamics
Volume8
Issue number4
DOIs
Publication statusPublished - Feb 1991

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ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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