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Updated: Jul 20, 2026
11:42
Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes
Published on: November 1, 2012
Stacking and hydrogen bonding: DNA cooperativity at melting.
Vladimir F Morozov1, Artem V Badasyan, Arsen V Grigoryan
1Department of Molecular Physics, Yerevan State University, A. Manougian Str.1, 375025, Yerevan, Armenia. morozov@ysu.am
Biopolymers
|October 7, 2004
Summary
We enhanced the Generalized Model of Polypeptide Chain (GMPC) by including base-base stacking interactions. This improves understanding of helix-coil transitions, showing increased stability but decreased cooperativity in polypeptides and polynucleotides.
Area of Science:
- Biophysics
- Computational Biology
- Polymer Science
Background:
- The Generalized Model of Polypeptide Chain (GMPC) describes helix-coil transitions.
- Existing models often focus on hydrogen bonding, potentially overlooking other interactions.
Purpose of the Study:
- To improve the GMPC by incorporating base-base stacking interactions.
- To analyze the impact of stacking on helix-coil transitions in polypeptides and polynucleotides.
Main Methods:
- Utilized a one-dimensional Potts-like model with many-particle interactions.
- Introduced nearest-neighbor stacking interactions into the GMPC framework.
Main Results:
- Incorporating stacking interactions increased the stability (melting temperature) of the helix-coil transition.
- Unexpectedly, stacking interactions decreased cooperativity (maximal correlation length).
Conclusions:
- Nearest-neighbor stacking interactions enhance the stability of polypeptides and polynucleotides.
- The observed decrease in cooperativity arises from the interplay between hydrogen bonding and stacking interactions.
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