Structural basis of human PCNA sliding on DNA.De March, M., Merino, N., Barrera-Vilarmau, S., Crehuet, R., Onesti, S., Blanco, F.J., De Biasio, A.
(2017) Nat Commun 8: 13935-13935
- PubMed: 28071730
- DOI: 10.1038/ncomms13935
- Primary Citation of Related Structures:
- Also Cited By: 6EHT
- PubMed Abstract:
- Structure of p15(PAF)-PCNA complex and implications for clamp sliding during DNA replication and repair.
De Biasio, A.,de Opakua, A.I.,Mortuza, G.B.,Molina, R.,Cordeiro, T.N.,Castillo, F.,Villate, M.,Merino, N.,Delgado, S.,Gil-Carton, D.,Luque, I.,Diercks, T.,Bernado, P.,Montoya, G.,Blanco, F.J.
(2015) Nat Commun 6: 6439
Sliding clamps encircle DNA and tether polymerases and other factors to the genomic template. However, the molecular mechanism of clamp sliding on DNA is unknown. Using crystallography, NMR and molecular dynamics simulations, here we show that the hu ...
Sliding clamps encircle DNA and tether polymerases and other factors to the genomic template. However, the molecular mechanism of clamp sliding on DNA is unknown. Using crystallography, NMR and molecular dynamics simulations, here we show that the human clamp PCNA recognizes DNA through a double patch of basic residues within the ring channel, arranged in a right-hand spiral that matches the pitch of B-DNA. We propose that PCNA slides by tracking the DNA backbone via a 'cogwheel' mechanism based on short-lived polar interactions, which keep the orientation of the clamp invariant relative to DNA. Mutation of residues at the PCNA-DNA interface has been shown to impair the initiation of DNA synthesis by polymerase δ (pol δ). Therefore, our findings suggest that a clamp correctly oriented on DNA is necessary for the assembly of a replication-competent PCNA-pol δ holoenzyme.
Institute of Advanced Chemistry of Catalonia (IQAC), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.,Structural Biology Laboratory, Elettra-Sincrotrone Trieste S.C.p.A., 34149 Trieste, Italy.,CIC bioGUNE, Parque Tecnologico de Bizkaia Edificio 800, 48160 Derio, Spain.,IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain.