[Modélisation théorique des expériences de molécules uniques sur l'ADN et l'ARN : de l'élasticité au dégraffage des bases]
Les travaux théoriques portant sur les expériences sur molécules uniques sont ici passés en revue. Tout d'abord, nous introduisons les modèles simples de polymères élastiques. Ensuite, nous expliquons comment ces modèles peuvent être utilisés pour interpréter les mesures de force-extension effectuées sur une molécule unique d'ADN (simple brin ou double brin), mesures qui mettent en évidence tantôt le caractère élastique de cette molécule, tantôt des transitions structurelles brutales. Dans une troisième partie, nous montrons qu'en associant les propriétes élastiques des brins d'acides nucléiques à une description de leurs interactions d'appariement, l'essentiel de la phénomènologie et de la cinétique de dégraffage de l'ARN et l'ADN peut être expliqué.
We review statistical-mechanical theories of single-molecule micromanipulation experiments on nucleic acids. Firstly, models for describing polymer elasticity are introduced. We then review how these models are used to interpret single-molecule force-extension experiments on single-stranded and double-stranded DNA. Depending on the force and the molecules used, both smooth elastic behavior and abrupt structural transitions are observed. Thirdly, we show how combining the elasticity of two single nucleic acid strands with a description of the base-pairing interactions between them explains much of the phenomenology and kinetics of RNA and DNA ‘unzipping’ experiments.
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Mot clés : micromanipulation, élasticité des polymères, ADN, ARNs
Simona Cocco 1 ; John F. Marko 2 ; Rémi Monasson 3
@article{CRPHYS_2002__3_5_569_0, author = {Simona Cocco and John F. Marko and R\'emi Monasson}, title = {Theoretical models for single-molecule {DNA} and {RNA} experiments: from elasticity to unzipping}, journal = {Comptes Rendus. Physique}, pages = {569--584}, publisher = {Elsevier}, volume = {3}, number = {5}, year = {2002}, doi = {10.1016/S1631-0705(02)01345-2}, language = {en}, }
TY - JOUR AU - Simona Cocco AU - John F. Marko AU - Rémi Monasson TI - Theoretical models for single-molecule DNA and RNA experiments: from elasticity to unzipping JO - Comptes Rendus. Physique PY - 2002 SP - 569 EP - 584 VL - 3 IS - 5 PB - Elsevier DO - 10.1016/S1631-0705(02)01345-2 LA - en ID - CRPHYS_2002__3_5_569_0 ER -
Simona Cocco; John F. Marko; Rémi Monasson. Theoretical models for single-molecule DNA and RNA experiments: from elasticity to unzipping. Comptes Rendus. Physique, Volume 3 (2002) no. 5, pp. 569-584. doi : 10.1016/S1631-0705(02)01345-2. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(02)01345-2/
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