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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：Oncogenesis

收录刊物：SCIE

卷号：7

期号：3

ISSN号：2157-9024

摘要：alpha-catenin has been demonstrated to suppress several different types of cancers. Here we demonstrate that alpha-catenin is modified by SUMO protein, which covalently binds alpha-catenin at the carboxy terminus at lysine 870. Substitution of lysine 870 with arginine completely abolishes alpha-catenin SUMOylation. This modification can be removed by SENP1. However, alpha-catenin SUMOylation does not affect its stability and subcellular localization. In addition, we observed that the SUMOylation-deficient alpha-catenin mutant has a reduced interaction with IkappaBalpha which prevents subsequent ubiquitination of IkappaBalpha, and therefore a reduced suppression of expression of the NF-kappaB target genes TNF-alpha, IL-8, VEGF, and uPA. In addition, the alpha-catenin SUMOylation mutant shows impaired suppression of tumor growth. These results demonstrate that SUMOylation at lysine 870 of alpha-catenin plays a key role in the suppression of the NF-kappaB pathway, which inhibits breast cancer tumor growth and migration.