Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 16.67 kDa 
• Atom Count: 1173 
• Modelled Residue Count: 143 
• Deposited Residue Count: 143 
• Unique protein chains: 2

2LE8

The protein complex for DNA replication

• PDB DOI: 10.2210/pdb2LE8/pdb
• BMRB: 17702

• Classification: REPLICATION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2011-06-14 Released: 2012-12-19 
• Deposition Author(s): Liu, C., Wei, Z., Zhu, G.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 19 
• Selection Criteria: structures with the least restraint violations 

Literature

Structural insights into the Cdt1-mediated MCM2-7 chromatin loading

Liu, C., Wu, R., Zhou, B., Wang, J., Wei, Z., Tye, B.K., Liang, C., Zhu, G.

(2012) Nucleic Acids Res 40: 3208-3217

• PubMed: 22140117 
• DOI: 10.1093/nar/gkr1118
• Primary Citation of Related Structures:  
  2LE8


• PubMed Abstract: 
  

Initiation of DNA replication in eukaryotes is exquisitely regulated to ensure that DNA replication occurs exactly once in each cell division. A conserved and essential step for the initiation of eukaryotic DNA replication is the loading of the mini-chromosome maintenance 2-7 (MCM2-7) helicase onto chromatin at replication origins by Cdt1. To elucidate the molecular mechanism of this event, we determined the structure of the human Cdt1-Mcm6 binding domains, the Cdt1(410-440)/MCM6(708-821) complex by NMR. Our structural and site-directed mutagenesis studies showed that charge complementarity is a key determinant for the specific interaction between Cdt1 and Mcm2-7. When this interaction was interrupted by alanine substitutions of the conserved interacting residues, the corresponding yeast Cdt1 and Mcm6 mutants were defective in DNA replication and the chromatin loading of Mcm2, resulting in cell death. Having shown that Cdt1 and Mcm6 interact through their C-termini, and knowing that Cdt1 is tethered to Orc6 during the loading of MCM2-7, our results suggest that the MCM2-7 hexamer is loaded with its C terminal end facing the ORC complex. These results provide a structural basis for the Cdt1-mediated MCM2-7 chromatin loading.

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Organizational Affiliation: 

Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA replication licensing factor MCM6	A	114	Homo sapiens	Mutation(s): 1  Gene Names: MCM6 EC: 3.6.4.12
UniProt & NIH Common Fund Data Resources
Find proteins for Q14566 (Homo sapiens) Explore Q14566  Go to UniProtKB:  Q14566
PHAROS:  Q14566 GTEx:  ENSG00000076003

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA replication factor Cdt1	B	29	Homo sapiens	Mutation(s): 0  Gene Names: CDT1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H211 (Homo sapiens) Explore Q9H211  Go to UniProtKB:  Q9H211
PHAROS:  Q9H211 GTEx:  ENSG00000167513

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 19 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 2LE8 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-06-14 
• Released Date: 2012-12-19 
Deposition Author(s): Liu, C., Wei, Z., Zhu, G.

Revision History  

• Version 1.0: 2012-12-19
  Type: Initial release
  
• Version 1.1: 2017-06-21
  Changes: Database references