1IG9 image
Deposition Date 2001-04-17
Release Date 2001-06-11
Last Version Date 2023-08-16
Entry Detail
PDB ID:
1IG9
Keywords:
TRANSFERASE/DNA
Title:
Structure of the Replicating Complex of a Pol Alpha Family DNA Polymerase
Biological Source:
Source Organism:
Enterobacteria phage RB69 (Taxon ID: 12353)
Host Organism:
Escherichia coli BL21(DE3)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.60 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
1IG9 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA POLYMERASE
Gene (Uniprot):43
Mutations:Exonuclease-deficient (D222A/D327A) mutant
Chain IDs:C (auth: A)
Chain Length:903
Number of Molecules:1
Biological Source:Enterobacteria phage RB69
UniProt ID:Q38087 Pfam ID:PF03104, PF00136 EC:2.7.7.7
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
DOC B DC 2',3'-DIDEOXYCYTIDINE-5'-MONOPHOSPHATE
Ligand Molecules
CA
TTP
Primary Citation
Structure of the Replicating Complex of a Pol Alpha Family DNA Polymerase
Cell(Cambridge,Mass.) 105 657 667 (2001)
PMID: 11389835 DOI: 10.1016/S0092-8674(01)00367-1

Abstact

We describe the 2.6 A resolution crystal structure of RB69 DNA polymerase with primer-template DNA and dTTP, capturing the step just before primer extension. This ternary complex structure in the human DNA polymerase alpha family shows a 60 degrees rotation of the fingers domain relative to the apo-protein structure, similar to the fingers movement in pol I family polymerases. Minor groove interactions near the primer 3' terminus suggest a common fidelity mechanism for pol I and pol alpha family polymerases. The duplex product DNA orientation differs by 40 degrees between the polymerizing mode and editing mode structures. The role of the thumb in this DNA motion provides a model for editing in the pol alpha family.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
1WAJ
1CLQ