Morin, Jose A.Cao García, Francisco JavierLazaro, Jose M.Ricardo Arias-Gonzalez, J.Valpuesta, Jose M.Carrascosa, Jose L.Salas, MargaritaIbarra, Borja2024-07-022024-07-022012-05-22Morin, J. A., Cao, F. J., Lázaro, J. M., Arias-Gonzalez, J. R., Valpuesta, J. M., Carrascosa, J. L., ... & Ibarra, B. (2012). Active DNA unwinding dynamics during processive DNA replication. Proceedings of the National Academy of Sciences, 109(21), 8115-8120.0027-842410.1073/pnas.1204759109https://hdl.handle.net/20.500.14352/105439Se deposita la versión postprint del artículoDuplication of double-stranded DNA (dsDNA) requires a fine-tuned coordination between the DNA replication and unwinding reactions. Using optical tweezers, we probed the coupling dynamics between these two activities when they are simultaneously carried out by individual Phi29 DNA polymerase molecules replicating a dsDNA hairpin. We used the wild-type and an unwinding deficient polymerase variant and found that mechanical tension applied on the DNA and the DNA sequence modulate in different ways the replication, unwinding rates, and pause kinetics of each polymerase. However, incorporation of pause kinetics in a model to quantify the unwinding reaction reveals that both polymerases destabilize the fork with the same active mechanism and offers insights into the topological strategies that could be used by the Phi29 DNA polymerase and other DNA replication systems to couple unwinding and replication reactions.engjournal article1091-6490https://doi.org.10.1073/pnas.1204759109https://www.pnas.org/doi/full/10.1073/pnas.1204759109restricted access577molecular motorssingle-moleculestrand displacementreplicative DNA polymeraseGenéticaQuímica física (Física)2409 Genética2307 Química Física2406 Biofísica