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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...

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Related Experiment Video

Updated: May 30, 2026

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

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Ub-family modifications at the replication fork: Regulating PCNA-interacting components.

Ann L Kirchmaier¹

¹Department of Biochemistry and Purdue University Center for Cancer Research, Purdue University, 175 S. University St., West Lafayette, IN 47907, USA. kirchmaier@purdue.edu

|August 18, 2011

Summary

This summary is machine-generated.

Ubiquitin modifications orchestrate protein interactions with Proliferating Cell Nuclear Antigen (PCNA) at DNA replication forks. This regulation is crucial for DNA synthesis, repair, and chromatin assembly during cell division.

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Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Proliferating Cell Nuclear Antigen (PCNA) is a key scaffold protein at the DNA replication fork.
PCNA interacts with numerous proteins to coordinate DNA replication, repair, and chromatin assembly.
The dynamic recruitment and turnover of PCNA-interacting proteins are essential for genome stability.

Purpose of the Study:

To review the roles of ubiquitin-related modifications in regulating PCNA-interacting proteins.
To explore how these modifications control protein dynamics at the replication fork.
To understand the implications for DNA replication, repair, and epigenetic processes.

Main Methods:

Literature review of studies investigating PCNA interactions and ubiquitin modifications.
Analysis of molecular mechanisms governing protein recruitment and turnover at replication forks.
Synthesis of findings related to DNA replication, chromatin dynamics, and epigenetic regulation.

Main Results:

Ubiquitin modifications play a critical role in the dynamic exchange of PCNA-binding partners.
These modifications influence the recruitment and dissociation of proteins involved in replication and repair.
Ubiquitination impacts chromatin assembly, DNA methylation, and histone modification at replication sites.

Conclusions:

Ubiquitin-related modifications are central regulators of PCNA-dependent processes at the replication fork.
Understanding these mechanisms is vital for comprehending DNA replication fidelity and epigenetic maintenance.
Further research into ubiquitin signaling pathways offers insights into genome stability and cell cycle control.