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

Hossain, Manzar, Bhalla, Kuhulika, Stillman, Bruce (March 2021) Multiple, short protein binding motifs in ORC1 and CDC6 control the initiation of DNA replication. Molecular Cell. ISSN 1097-2765

URL: https://www.ncbi.nlm.nih.gov/pubmed/33761311
DOI: 10.1016/j.molcel.2021.03.003

Abstract

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.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > DNA replication
organs, tissues, organelles, cell types and functions > cell types and functions > cell functions > cell cycle
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > origin recognition complex
CSHL Authors:
Communities: CSHL labs > Stillman lab
SWORD Depositor: CSHL Elements
Highlight: Stillman, Bruce W.
Depositing User: CSHL Elements
Date: 13 March 2021
Date Deposited: 05 May 2021 18:54
Last Modified: 21 Jun 2021 14:04
PMCID: PMC8106667
URI: https://repository.cshl.edu/id/eprint/39990

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