5FKU

cryo-EM structure of the E. coli replicative DNA polymerase complex in DNA free state (DNA polymerase III alpha, beta, epsilon, tau complex)

Summary for 5FKU

• Entry DOI: 10.2210/pdb5fku/pdb
• Related: 5FKV 5FKW
• EMDB information: 3201
• Descriptor: DNA POLYMERASE III SUBUNIT ALPHA, DNA POLYMERASE III SUBUNIT BETA, DNA POLYMERASE III SUBUNIT EPSILON, ... (4 entities in total)
• Functional Keywords: transferase, dna replication, dna polymerase iii alpha, dna polymerase iii beta, dna polymerase iii epsilon, dna polymerase iii tau
• Biological source: ESCHERICHIA COLI K-12; More
• Total number of polymer chains: 5
• Total formula weight: 254752.70

Authors

Fernandez-Leiro, R.,Conrad, J.,Scheres, S.H.W.,Lamers, M.H. (deposition date: 2015-10-20, release date: 2015-11-25, Last modification date: 2024-05-08)

Primary citation

Fernandez-Leiro, R.,Conrad, J.,Scheres, S.H.,Lamers, M.H.
cryo-EM structures of theE. colireplicative DNA polymerase reveal its dynamic interactions with the DNA sliding clamp, exonuclease andtau.
Elife, 4:-, 2015

PubMed Abstract: The replicative DNA polymerase PolIIIα from is a uniquely fast and processive enzyme. For its activity it relies on the DNA sliding clamp β, the proofreading exonuclease ε and the C-terminal domain of the clamp loader subunit τ. Due to the dynamic nature of the four-protein complex it has long been refractory to structural characterization. Here we present the 8 Å resolution cryo-electron microscopy structures of DNA-bound and DNA-free states of the PolIII-clamp-exonuclease-τ complex. The structures show how the polymerase is tethered to the DNA through multiple contacts with the clamp and exonuclease. A novel contact between the polymerase and clamp is made in the DNA bound state, facilitated by a large movement of the polymerase tail domain and τ. These structures provide crucial insights into the organization of the catalytic core of the replisome and form an important step towards determining the structure of the complete holoenzyme.

PubMed: 26499492
DOI: 10.7554/eLife.11134

Experimental method

ELECTRON MICROSCOPY (8.34 Å)