Epidermal growth factor receptor potentiates MCM7-mediated DNA replication through tyrosine phosphorylation of Lyn kinase in human cancers.

Epidermal growth factor receptor (EGFR) initiates a signaling cascade that leads to DNA synthesis and cell proliferation, but its role in regulating DNA replication licensing is unclear. Here, we show that activated EGFR phosphorylates the p56 isoform of Lyn, p56(Lyn), at Y32, which then phosphorylates MCM7, a licensing factor critical for DNA replication, at Y600 to increase its association with other minichromosome maintenance complex proteins, thereby promoting DNA synthesis complex assembly and cell proliferation. Both p56(Lyn) Y32 and MCM7 Y600 phosphorylation are enhanced in proliferating cells and correlated with poor survival of breast cancer patients. These results establish a signaling cascade in which EGFR enhances MCM7 phosphorylation and DNA replication through Lyn phosphorylation in human cancer cells. Copyright © 2013 Elsevier Inc. All rights reserved.

Citation

Tzu-Hsuan Huang, Longfei Huo, Ying-Nai Wang, Weiya Xia, Yongkun Wei, Shih-Shin Chang, Wei-Chao Chang, Yueh-Fu Fang, Chun-Te Chen, Jing-Yu Lang, Chun Tu, Yan Wang, Ming-Chuan Hsu, Hsu-Ping Kuo, How-Wen Ko, Jia Shen, Heng-Huan Lee, Pei-Chih Lee, Yun Wu, Chung-Hsuan Chen, Mien-Chie Hung. Epidermal growth factor receptor potentiates MCM7-mediated DNA replication through tyrosine phosphorylation of Lyn kinase in human cancers. Cancer cell. 2013 Jun 10;23(6):796-810

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PMID: 23764002

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