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2022-01-10

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cc-by (c) Martín Martínez, Benjamín et al., 2022
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/187393

Molecular basis or arginine and lysine DNA sequence-dependent thermo-stability modulation

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https://doi.org/10.1371/journal.pcbi.1009749

Abstract

We have used a variety of theoretical and experimental techniques to study the role of four basic amino acids-Arginine, Lysine, Ornithine and L-2,4-Diaminobutyric acid-on the structure, flexibility and sequence-dependent stability of DNA. We found that the presence of organic ions stabilizes the duplexes and significantly reduces the difference in stability between AT- and GC-rich duplexes with respect to the control conditions. This suggests that these amino acids, ingredients of the primordial soup during abiogenesis, could have helped to equalize the stability of AT- and GC-rich DNA oligomers, facilitating a general noncatalysed self-replication of DNA. Experiments and simulations demonstrate that organic ions have an effect that goes beyond the general electrostatic screening, involving specific interactions along the grooves of the double helix. We conclude that organic ions, largely ignored in the DNA world, should be reconsidered as crucial structural elements far from mimics of small inorganic cations.

Subject

ADN, Biologia molecular, Termodinàmica, Aminoàcids

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DNA, Molecular biology, Thermodynamics, Amino acids

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Articles publicats en revistes (Química Inorgànica i Orgànica)
Articles publicats en revistes (Institut de Recerca Biomèdica (IRB Barcelona))

Citation

MARTÍN MARTÍNEZ, Benjamín, et al. Molecular basis or arginine and lysine DNA sequence-dependent thermo-stability modulation. PLoS Computational Biology. 2022. Vol. 18, num. 1, pags. e1009749. ISSN 1553-734X. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/187393

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