期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 18, 页码 5667-5672出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1417711112
关键词
mismatch repair; PCNA phosphorylation; EGFR; genome instability; cancer
资金
- National Cancer Institute [CA167181, T32 CA165990]
- National Natural Science Foundation of China [31370766, 31461143005]
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 MutS alpha and MutS beta and interferes with PCNA-dependent activation of MutL alpha endonuclease, thereby inhibiting MMR at the initiation step. Evidence is also provided that Y211-phosphorylated PCNA induces nucleotide misin-corporation 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.
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