{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nProliferating cell nuclear antigen (PCNA) serves as a master coordinator at the replication fork, acting as a sliding clamp that encircles DNA to recruit and organize diverse factors for DNA synthesis and repair. PCNA undergoes dynamic post‐translational modifications—including mono‐ and polyubiquitination as well as SUMO conjugation—that help mediate the polymerase switch during translesion synthesis and promote error‐free damage bypass. Its ability to rapidly exchange binding partners enables timely coordination of replication‐linked repair processes, as evidenced by its interactions that recruit homologues of yeast Rad5 for template switching and fork restart."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n \nPCNA also functions as a platform to trigger the timely degradation of key regulatory proteins. Through specific interactions via its PCNA-interacting protein (PIP) motifs, it recruits E3 ubiquitin ligase complexes such as CRL4(Cdt2) to target replication licensing factors (e.g., Cdt1), histone-modifying enzymes like SET8/PR-Set7, and cell cycle inhibitors including p21 for proteasomal degradation. Structural studies have further revealed that adaptor peptides bound to PCNA can mediate the formation of quaternary complexes that synchronize DNA replication and repair with cell cycle progression, while PCNA-associated complexes additionally influence regulators of p53 and MDM2 turnover."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "17"}]}, {"type": "t", "text": "\n \nIn addition to its role in replication and proteolysis, PCNA serves as a versatile scaffold in the coordination of DNA repair pathways. It directly interacts with proteins such as FEN1 and XRCC1 to promote the processing of Okazaki fragments and to facilitate single-strand break repair, while also stimulating the activity of specialized DNA glycosylases that excise oxidized bases. Furthermore, PCNA’s modified forms serve as recruitment hubs for translesion synthesis polymerases—with noncanonical binding motifs ensuring preferential engagement—and for translocases like ZRANB3 that remodel stalled forks, thereby maintaining replication fork stability under stress."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "25"}]}, {"type": "t", "text": "\n \nBeyond these molecular repair and regulatory functions, PCNA is intimately linked to broader aspects of genome integrity, chromatin organization, and cell fate. 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