4.8 Article

Multiple, short protein binding motifs in ORC1 and CDC6 control the initiation of DNA replication

Journal

MOLECULAR CELL
Volume 81, Issue 9, Pages 1951-+

Publisher

CELL PRESS
DOI: 10.1016/j.molcel.2021.03.003

Keywords

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Funding

  1. National Cancer Institute [P01CA013106]
  2. National Institute of General Medical Sciences [R01GM045436]

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The initiation of DNA replication involves the assembly and disassembly of protein complexes, multiple short linear protein motifs in ORC1 and CDC6 mediate cell cycle-dependent protein-protein interactions, with different mechanisms at different cell cycle phases, ultimately promoting the assembly of the ORC1-CDC6 complex.
The initiation of DNA replication involves cell cycle-dependent assembly and disassembly of protein complexes, including the origin recognition complex (ORC) and CDC6 AAA(+) ATPases. We report that multiple short linear protein motifs (SLiMs) within intrinsically disordered regions (IDRs) in ORC1 and CDC6 mediate cyclin-CDK-dependent and independent protein-protein interactions, conditional on the cell cycle phase. A domain within the ORC1 IDR is required for interaction between the ORC1 and CDC6 AAA+ domains in G1, whereas the same domain prevents CDC6-ORC1 interaction during mitosis. Then, during late G1, this domain facilitates ORC1 destruction by a SKP2-cyclin A-CDK2-dependent mechanism. During G1, the CDC6 Cy motif cooperates with cyclin E-CDK2 to promote ORC1-CDC6 interactions. The CDC6 IDR regulates self-interaction by ORC1, thereby controlling ORC1 protein levels, Protein phosphatase 1 binds directly to a SLiM in the ORC1 IDR, causing ORC1 de-phosphorylation upon mitotic exit, increasing ORC1 protein, and promoting pre-RC assembly.

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