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Functions of Multiple Clamp and Clamp-Loader Complexes in Eukaryotic DNA Replication.
Eiji Ohashi1, Toshiki Tsurimoto2
1Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.
Advances in Experimental Medicine and Biology
|January 23, 2018
Summary
Proliferating cell nuclear antigen (PCNA) and replication factor C (RFC) are crucial for DNA replication and genome integrity. Alternative clamp-loader complexes regulate PCNA function, ensuring proper DNA repair and cell cycle progression.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Proliferating cell nuclear antigen (PCNA) and replication factor C (RFC) were initially identified as essential for DNA replication elongation.
- PCNA functions beyond replication, acting as a hub for protein interactions crucial for maintaining genome integrity in proliferating cells.
- Eukaryotes possess multiple paralogs of PCNA and RFC, forming alternative clamp-loader complexes.
Purpose of the Study:
- To elucidate the diverse roles of PCNA and its associated loader complexes in DNA replication and repair.
- To highlight the function of alternative clamp-loader systems, such as the 9-1-1 complex and CTF18-RFC and ELG1-RFC, in genomic regulation.
Main Methods:
- Review and synthesis of existing literature on PCNA, RFC, and related clamp-loader complexes.
- Analysis of protein-protein interactions and functional roles in DNA replication and damage response pathways.
Main Results:
- PCNA is a central factor in DNA replication and genome maintenance.
- The heterotrimeric 9-1-1 ring complex, loaded by RAD17-RFC, transmits DNA damage signals.
- CTF18-RFC and ELG1-RFC regulate PCNA loading and unloading during S phase, ensuring precise enzyme localization.
Conclusions:
- Alternative PCNA loader complexes play distinct and vital roles in DNA replication, repair, and cell cycle control.
- These regulatory mechanisms are essential for maintaining genomic stability in eukaryotic cells.
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