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Cryo-EM structure of the E. coli replicative DNA polymerase-clamp-exonuclase-theta complex bound to DNA in the editing mode
ELECTRON MICROSCOPY
Sample
DNA polymerase III alpha, beta, epsilon, theta complex with mismatched DNA duplex
Sample Components
DNA polymerase III alpha, beta, epsilon, theta complex with mismatched DNA duplex
mismatched DNA duplex
Specimen Preparation
Sample Aggregation State
PARTICLE
Vitrification Instrument
FEI VITROBOT MARK IV
Cryogen Name
ETHANE
Sample Vitrification Details
Prior to sample preparation 0.1 volumes of 0.05% Tween 20 were added to the sample 3 microliters were pipetted onto the grid and blotted for 4 seconds ...
Prior to sample preparation 0.1 volumes of 0.05% Tween 20 were added to the sample 3 microliters were pipetted onto the grid and blotted for 4 seconds
3D Reconstruction
Reconstruction Method
SINGLE PARTICLE
Number of Particles
15616
Reported Resolution (Å)
6.7
Resolution Method
FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type
POINT
Point Symmetry
C1
Map-Model Fitting and Refinement
Id
1
Refinement Space
Refinement Protocol
OTHER
Refinement Target
Overall B Value
Fitting Procedure
Details
The cryo-EM structure of the PolIIIalpha-clamp-exonuclease complex in the polymerase mode (PDB code: 5FKW) was used as a starting model, and the NMR s ...
The cryo-EM structure of the PolIIIalpha-clamp-exonuclease complex in the polymerase mode (PDB code: 5FKW) was used as a starting model, and the NMR structure of theta bound to the exonuclease catalytic domain (PDB code: 2XY8) was used to place theta into the cryo-EM map. The model was manually adjusted in Coot and geometry of the protein optimized in Refmac5 using DNA-specific restraints generated in LibG