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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bug, Monika Meyer, Hemmo Kirchner, Philipp |
| Description | Author Affiliation: Kirchner P ( Centre for Medical Biotechnology, Faculty of Biology, University of Duisburg-Essen, 45117 Essen, Germany.) |
| Abstract | Caveolin-1 (CAV1) is the defining constituent of caveolae at the plasma membrane of many mammalian cells. For turnover, CAV1 is ubiquitinated and sorted to late endosomes and lysosomes. Sorting of CAV1 requires the AAA+-type ATPase VCP and its cofactor UBXD1. However, it is unclear in which region CAV1 is ubiquitinated and how ubiquitination is linked to sorting of CAV1 by VCP-UBXD1. Here, we show through site-directed mutagenesis that ubiquitination of CAV1 occurs at any of the six lysine residues, 5, 26, 30, 39, 47, and 57, that are clustered in the N-terminal region but not at lysines in the oligomerization, intramembrane, or C-terminal domains. Mutation of Lys-5–57 to arginines prevented binding of the VCP-UBXD1 complex and, importantly, strongly reduced recruitment of VCP-UBXD1 to endocytic compartments. Moreover, the Lys-5–57Arg mutation specifically interfered with trafficking of CAV1 from early to late endosomes. Conversely and consistently, depletion of VCP or UBXD1 led to accumulation of ubiquitinated CAV1, suggesting that VCP acts downstream of ubiquitination and is required for transport of the ubiquitinated form of CAV1 to late endosomes. These results define the N-terminal region of CAV1 as the critical ubiquitin conjugation site and, together with previous data, demonstrate the significance of this ubiquitination for binding to the VCP-UBXD1 complex and for sorting into lysosomes. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 10 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-03-08 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adenosine Triphosphatases Metabolism Carrier Proteins Caveolin 1 Cell Cycle Proteins Endosomes Genetics Amino Acid Substitution Arginine Blotting, Western Chemistry Cell Line, Tumor Endosomal Sorting Complexes Required For Transport HEK293 Cells Lysine Lysosomes Microscopy, Confocal Mutation Protein Transport RNA Interference Ubiquitinated Proteins Ubiquitination Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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