2WVR image
Deposition Date 2009-10-19
Release Date 2009-10-27
Last Version Date 2024-05-08
Entry Detail
PDB ID:
2WVR
Keywords:
Title:
Human Cdt1:Geminin complex
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.30 Å
R-Value Free:
0.30
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:GEMININ
Gene (Uniprot):GMNN
Chain IDs:A, B
Chain Length:209
Number of Molecules:2
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Molecule:DNA REPLICATION FACTOR CDT1
Gene (Uniprot):CDT1
Chain IDs:C
Chain Length:546
Number of Molecules:1
Biological Source:HOMO SAPIENS
Ligand Molecules
Primary Citation
Quaternary Structure of the Human Cdt1-Geminin Complex Regulates DNA Replication Licensing.
Proc.Natl.Acad.Sci.USA 106 19807 ? (2009)
PMID: 19906994 DOI: 10.1073/PNAS.0905281106

Abstact

All organisms need to ensure that no DNA segments are rereplicated in a single cell cycle. Eukaryotes achieve this through a process called origin licensing, which involves tight spatiotemporal control of the assembly of prereplicative complexes (pre-RCs) onto chromatin. Cdt1 is a key component and crucial regulator of pre-RC assembly. In higher eukaryotes, timely inhibition of Cdt1 by Geminin is essential to prevent DNA rereplication. Here, we address the mechanism of DNA licensing inhibition by Geminin, by combining X-ray crystallography, small-angle X-ray scattering, and functional studies in Xenopus and mammalian cells. Our findings show that the Cdt1:Geminin complex can exist in two distinct forms, a "permissive" heterotrimer and an "inhibitory" heterohexamer. Specific Cdt1 residues, buried in the heterohexamer, are important for licensing. We postulate that the transition between the heterotrimer and the heterohexamer represents a molecular switch between licensing-competent and licensing-defective states.

Legend

Protein

Chemical

Disease

Primary Citation of related structures