2VYE image
Deposition Date 2008-07-23
Release Date 2008-12-30
Last Version Date 2023-12-13
Entry Detail
PDB ID:
2VYE
Keywords:
Title:
Crystal Structure of the DnaC-ssDNA complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
4.10 Å
R-Value Free:
0.37
R-Value Work:
0.30
R-Value Observed:
0.30
Space Group:
P 63
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:REPLICATIVE DNA HELICASE
Gene (Uniprot):GK3476
Chain IDs:A, B
Chain Length:454
Number of Molecules:2
Biological Source:GEOBACILLUS KAUSTOPHILUS HTA426
Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*TP*TP*TP*TP*TP*TP*TP*TP*TP)-3'
Chain IDs:C
Chain Length:9
Number of Molecules:1
Biological Source:ESCHERICHIA COLI
Ligand Molecules
Primary Citation
The Crystal Structure of a Replicative Hexameric Helicase Dnac and its Complex with Single-Stranded DNA.
Nucleic Acids Res. 37 804 ? (2009)
PMID: 19074952 DOI: 10.1093/NAR/GKN999

Abstact

DNA helicases are motor proteins that play essential roles in DNA replication, repair and recombination. In the replicative hexameric helicase, the fundamental reaction is the unwinding of duplex DNA; however, our understanding of this function remains vague due to insufficient structural information. Here, we report two crystal structures of the DnaB-family replicative helicase from Geobacillus kaustophilus HTA426 (GkDnaC) in the apo-form and bound to single-stranded DNA (ssDNA). The GkDnaC-ssDNA complex structure reveals that three symmetrical basic grooves on the interior surface of the hexamer individually encircle ssDNA. The ssDNA-binding pockets in this structure are directed toward the N-terminal domain collar of the hexameric ring, thus orienting the ssDNA toward the DnaG primase to facilitate the synthesis of short RNA primers. These findings provide insight into the mechanism of ssDNA binding and provide a working model to establish a novel mechanism for DNA translocation at the replication fork.

Legend

Protein

Chemical

Disease

Primary Citation of related structures