2LE8
The protein complex for DNA replication
Summary for 2LE8
| Entry DOI | 10.2210/pdb2le8/pdb |
| NMR Information | BMRB: 17702 |
| Descriptor | DNA replication licensing factor MCM6, DNA replication factor Cdt1 (2 entities in total) |
| Functional Keywords | dna replication, replication |
| Biological source | Homo sapiens (human) More |
| Cellular location | Nucleus: Q14566 Q9H211 |
| Total number of polymer chains | 2 |
| Total formula weight | 16665.79 |
| Authors | |
| Primary citation | Liu, C.,Wu, R.,Zhou, B.,Wang, J.,Wei, Z.,Tye, B.K.,Liang, C.,Zhu, G. Structural insights into the Cdt1-mediated MCM2-7 chromatin loading Nucleic Acids Res., 40:3208-3217, 2012 Cited by 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. PubMed: 22140117DOI: 10.1093/nar/gkr1118 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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