期刊
CELL CYCLE
卷 13, 期 14, 页码 2200-2210出版社
LANDES BIOSCIENCE
DOI: 10.4161/cc.29209
关键词
p53; Isg15; protein degradation misfolded protein; apoptosis
类别
资金
- Agency for Science, Technology and Research (Singapore)
Degradation of p53 is a cornerstone in the control of its functions as a tumor suppressor. This process is attributed to ubiquitin-dependent modification of p53. In addition to polyubiquitination, we found that p53 is targeted for degradation through ISGylation. Isg15, a ubiquitin-like protein, covalently modifies p53 at 2 sites in the N and C terminus, and ISGylated p53 can be degraded by the 20S proteasome. ISGylation primarily targets a misfolded, dominant-negative p53, and Isg15 deletion in normal cells results in suppression of p53 activity and functions. We propose that Isg15-dependent degradation of p53 represents an alternative mechanism of controlling p53 protein levels, and, thus, it is an attractive pathway for drug discovery.
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