Abstract:
:The Skp1-Cul1-F-box protein (SCF) E3 ligase complex is one of the largest ubiquitin E3 ligase families. FBXL19, a F-box protein in SCFFBXL19 E3 ligase complex, regulates a variety of cellular responses including cell migration. We have shown that FBXL19 is not stable and its degradation is mediated by the ubiquitin-proteasome system, while the ubiquitin E3 ligase for FBXL19 ubiquitination and degradation has not been identified. In the study, we discovered that a new ubiquitin E3 ligase, SCFFBXW17 , ubiquitinates and induces FBXL19 degradation. Exogenous FBXW17 targets FBXL19 for its ubiquitination and degradation. Lysine 114 in FBXL19 is a potential ubiquitin acceptor site. Acetylation of FBXL19 attenuated SCFFBXW17 -mediated FBXL19 degradation. SCFFBXL19 E3 ligase reduced Rac1 levels and cell migration, while the effects were attenuated by exogenous FBXW17. Downregulation of FBXW17 attenuated lysophosphatidic acid-induced lamellipodia formation and Rac1 accumulation at migration leading edge. Taken together with our previous studies, FBXL19 is degraded by the ubiquitin-proteasome system and its site-specific ubiquitination is mediated by SCFFBXW17 E3 ligase, which promotes cell migration.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Dong S,Wei J,Bowser RK,Chen BB,Mallampalli RK,Miao J,Ye Q,Tran KC,Zhao Y,Zhao Jdoi
10.1002/jcb.29860subject
Has Abstractpub_date
2020-10-14 00:00:00eissn
0730-2312issn
1097-4644pub_type
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