β-Actin facilitates etoposide-induced p53 nuclear import

As a tumor suppressor, p53 preserves genomic integrity in eukaryotes. However, limited evidence is availablefor the p53 shuttling between the cytoplasm and nucleus. Previous studies have shown that b-actin polymerization negatively regulates p53 nuclear import through its interaction with p53. In this study, we found thatDNA damage induces both b-actin and p53 accumulation in the nucleus. b-actin knockdown impaired thenuclear transport of p53. Additionally, b-actin could interact with p53 which was enhanced in response togenotoxic stress. Furthermore, N terminal deletion mutants of p53 shows reduced levels of association with bactin. We further identified Ser15, Thr18 and Ser20 of p53 are critical to the b-actin: p53 interaction, whichupon mutation into alanine abrogates the binding. Taken together, this study reveals that b-actin regulates thenuclear import of p53 through protein–protein interaction.

Keywords

b-actin, p53, interaction, DNA damage, nuclear localization

Citation

Qi Wenjing, Li Jinjiao, Pei Xiaohua, Ke Yueshuang, Bu Qingpan, Ni Xiuzhen. β-Actin facilitates etoposide-induced p53 nuclear import. Journal of Biosciences. 2020 Feb; : 1-8

URI

https://imsear.searo.who.int/handle/123456789/214331

Collections

Journal of Biosciences

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