Phosphorylation of PCNA by EGFR inhibits mismatch repair and promotes misincorporation during DNA synthesis.

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Proceedings of the National Academy of Sciences of the United States of America, ISSN: 1091-6490, Vol: 112, Issue: 18, Page: 5667-72

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Ortega, Janice; Li, Jessie Y.; Lee, Sanghee; Tong, Dan; Gu, Liya; Li, Guo-Min
Proceedings of the National Academy of Sciences; National Academy of Sciences
Multidisciplinary; Medicine; Cell Line; Tumor; Cell Proliferation; Colorectal Neoplasms; DNA; DNA Mismatch Repair; Disease Progression; Genome; Human; HeLa Cells; Humans; Microscopy; Fluorescence; Models; Molecular; Mutation; Neoplasms; Phosphorylation; Proliferating Cell Nuclear Antigen; Protein Binding; Receptor; Epidermal Growth Factor; Sequence Analysis; Tyrosine; Oncology
article description
Proliferating cell nuclear antigen (PCNA) plays essential roles in eukaryotic cells during DNA replication, DNA mismatch repair (MMR), and other events at the replication fork. Earlier studies show that PCNA is regulated by posttranslational modifications, including phosphorylation of tyrosine 211 (Y211) by the epidermal growth factor receptor (EGFR). However, the functional significance of Y211-phosphorylated PCNA remains unknown. Here, we show that PCNA phosphorylation by EGFR alters its interaction with mismatch-recognition proteins MutSα and MutSβ and interferes with PCNA-dependent activation of MutLα endonuclease, thereby inhibiting MMR at the initiation step. Evidence is also provided that Y211-phosphorylated PCNA induces nucleotide misincorporation during DNA synthesis. These findings reveal a novel mechanism by which Y211-phosphorylated PCNA promotes cancer development and progression via facilitating error-prone DNA replication and suppressing the MMR function.