6MII image
Entry Detail
PDB ID:
6MII
Keywords:
Title:
Crystal structure of minichromosome maintenance protein MCM/DNA complex
Biological Source:
PDB Version:
Deposition Date:
2018-09-19
Release Date:
2019-07-24
Method Details:
Experimental Method:
Resolution:
3.15 Å
R-Value Free:
0.24
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Minichromosome maintenance protein MCM
Mutations:UNP residues 2-265, GGSGGS linker, UNP residues 275-612
Chain IDs:A, B, C, D, E, F
Chain Length:610
Number of Molecules:6
Biological Source:Sulfolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')
Chain IDs:G (auth: X)
Chain Length:12
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
DNA translocation mechanism of the MCM complex and implications for replication initiation.
Nat Commun 10 3117 3117 (2019)
PMID: 31308367 DOI: 10.1038/s41467-019-11074-3

Abstact

The DNA translocation activity of the minichromosome maintenance (MCM) complex powers DNA strand separation of the replication forks of eukaryotes and archaea. Here we illustrate an atomic level mechanism for this activity with a crystal structure of an archaeal MCM hexamer bound to single-stranded DNA and nucleotide cofactors. Sequence conservation indicates this rotary mechanism is fully possible for all eukaryotes and archaea. The structure definitively demonstrates the ring orients during translocation with the N-terminal domain leading, indicating that the translocation activity could also provide the physical basis of replication initiation where a double-hexamer idly encircling double-stranded DNA transforms to single-hexamers that encircle only one strand. In this mechanism, each strand binds to the N-terminal tier of one hexamer and the AAA+ tier of the other hexamer such that one ring pulls on the other, aligning equivalent interfaces to enable each hexamer to pull its translocation strand outside of the opposing hexamer.

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Primary Citation of related structures