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Synergism between CMG helicase and leading strand DNA polymerase at replication fork

Author

Listed:
  • Zhichun Xu

    (The University of Hong Kong)

  • Jianrong Feng

    (The Hong Kong University of Science & Technology)

  • Daqi Yu

    (The Hong Kong University of Science & Technology)

  • Yunjing Huo

    (The University of Hong Kong)

  • Xiaohui Ma

    (The Hong Kong University of Science & Technology)

  • Wai Hei Lam

    (The University of Hong Kong)

  • Zheng Liu

    (The University of Hong Kong)

  • Xiang David Li

    (The University of Hong Kong)

  • Toyotaka Ishibashi

    (The Hong Kong University of Science & Technology)

  • Shangyu Dang

    (The Hong Kong University of Science & Technology
    Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
    HKUST-Shenzhen Research Institute)

  • Yuanliang Zhai

    (The University of Hong Kong)

Abstract

The replisome that replicates the eukaryotic genome consists of at least three engines: the Cdc45-MCM-GINS (CMG) helicase that separates duplex DNA at the replication fork and two DNA polymerases, one on each strand, that replicate the unwound DNA. Here, we determined a series of cryo-electron microscopy structures of a yeast replisome comprising CMG, leading-strand polymerase Polε and three accessory factors on a forked DNA. In these structures, Polε engages or disengages with the motor domains of the CMG by occupying two alternative positions, which closely correlate with the rotational movement of the single-stranded DNA around the MCM pore. During this process, the polymerase remains stably coupled to the helicase using Psf1 as a hinge. This synergism is modulated by a concerted rearrangement of ATPase sites to drive DNA translocation. The Polε-MCM coupling is not only required for CMG formation to initiate DNA replication but also facilitates the leading-strand DNA synthesis mediated by Polε. Our study elucidates a mechanism intrinsic to the replisome that coordinates the activities of CMG and Polε to negotiate any roadblocks, DNA damage, and epigenetic marks encountered during translocation along replication forks.

Suggested Citation

  • Zhichun Xu & Jianrong Feng & Daqi Yu & Yunjing Huo & Xiaohui Ma & Wai Hei Lam & Zheng Liu & Xiang David Li & Toyotaka Ishibashi & Shangyu Dang & Yuanliang Zhai, 2023. "Synergism between CMG helicase and leading strand DNA polymerase at replication fork," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41506-0
    DOI: 10.1038/s41467-023-41506-0
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    References listed on IDEAS

    as
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