期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 542, 期 -, 页码 59-64出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2020.12.110
关键词
TSG101; UXT; CEP55; Lysosome
资金
- Chang Gung Memorial Hospital [CMRPD1F0213, CMRPD1J0011]
- Ministry of Science and Technology [MOST107-2320-B-182-038-MY3]
CEP55 expression level is important for cell cytokinesis and tumor stage. TSG101 can decrease protein levels through lysosome degradation and interacts with UXT to modulate protein degradation. This study identified a novel pathway for CEP55 regulation by TSG101 overexpression via lysosome degradation.
The expression level of CEP55, a centrosome and midbody-associated protein is pivotal for cell cytokinesis and is significantly correlated with tumor stage. Our previous study demonstrated that ectopic expression of TSG101 can decrease androgen receptor expression level through the lysosome degradation pathway. Here, we further extended the investigation of TSG101 in modulating protein levels through lysosomes, and identified ubiquitously expressed transcript (UXT) to be a novel TSG101 interaction partner associated with TSG101-containing cytoplasmic vesicles. We also demonstrated that CEP55 can be recruited to TSG101 cytoplasmic vesicles resulting in downregulation of CEP55 through lysosome degradation. Moreover, UXT depletion promoted TSG101 vesicle-lysosome association and elevated autophagic carrier flux to enhance CEP55 degradation upon TSG101 overexpression. In summary, we identified a novel CEP55 regulation pathway mediated by TSG101 overexpression via lysosome degradation and revealed that UXT plays a role in the late endosome/autophagosome-lysosome fusion event, engaging in TSG101-mediated lysosome degradation. (C) 2021 Elsevier Inc. All rights reserved.
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