期刊
PROTEOMICS
卷 21, 期 15, 页码 -出版社
WILEY
DOI: 10.1002/pmic.202000234
关键词
HEK293T; phosphorylation; post-translational modification; Ser65; SUMO2; ubiquitin; unanchored polyubiquitin
资金
- School of Life Sciences [A90321]
- Ghana Education Trust Fund
The study revealed a previously unappreciated complexity in ubiquitin modification, involving SUMO2 modification and phosphorylation of unanchored polyubiquitin chains.
Additional complexity in the post-translational modification of proteins by ubiquitin is achieved by ubiquitin phosphorylation, for example within PINK1-parkin mediated mitophagy. We performed a preliminary proteomic analysis to identify proteins differentially modified by ubiquitin in HEK293T, compared to phosphomimetic ubiquitin (Ser65Asp), and identified small ubiquitin-related modifier 2 (SUMO2) as a candidate. By transfecting SUMO2 and its C-terminal-GG deletion mutant, along with phosphomimetic ubiquitin, we confirm that ubiquitin modifies SUMO2, rather than vice versa. Further investigations revealed that transfected SUMO2 can also be conjugated by endogenous phospho-Ser65-(poly)ubiquitin in HEK293T cells, pointing to a previously unappreciated level of complexity in SUMO2 modification, and that unanchored (substrate-free) polyubiquitin chains may also be subject to phosphorylation.
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