期刊
EMBO JOURNAL
卷 27, 期 16, 页码 2250-2258出版社
WILEY
DOI: 10.1038/emboj.2008.135
关键词
AAA plus ATPase; archaea; DNA topology; electron microscopy; MCM2-7
资金
- Department of Life Science, Imperial College
- ELETTRA
- National Science Foundation [MCB-0815646]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1048394] Funding Source: National Science Foundation
The eukaryotic MCM2-7 complex is recruited at origins of replication during the G1 phase and acts as the main helicase at the replication fork during the S phase of the cell cycle. To characterize the interplay between the MCM helicase and DNA prior to the melting of the double helix, we determined the structure of an archaeal MCM orthologue bound to a 5.6-kb double-stranded DNA segment, using cryo-electron microscopy. DNA wraps around the N-terminal face of a single hexameric ring. This interaction requires a conformational change within the outer belt of the MCM N-terminal domain, exposing a previously unrecognized helix-turn-helix DNA-binding motif. Our findings provide novel insights into the role of the MCM complex during the initiation step of DNA replication.
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