Journal
CELL
Volume 152, Issue 5, Pages 1051-1064Publisher
CELL PRESS
DOI: 10.1016/j.cell.2013.01.051
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Funding
- Cancer Prevention and Research Initiative of Texas [R1117]
- Department of Defense [CA110261]
- Howard Hughes Medical Institute
- Mayo Foundation
- Michael L. Rosenberg Scholar in Medical Research fund
- NIH [R01-AI065474, R01-GM063692, R01-GM56322]
- Sara and Frank McKnight Fellowship
- Welch Foundation [I-1544, I-1389]
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Endosomal protein trafficking is an essential cellular process that is deregulated in several diseases and targeted by pathogens. Here, we describe a role for ubiquitination in this process. We find that the E3 RING ubiquitin ligase, MAGE-L2-TRIM27, localizes to endosomes through interactions with the retromer complex. Knockdown of MAGE-L2-TRIM27 or the Ube2O E2 ubiquitin-conjugating enzyme significantly impaired retromer-mediated transport. We further demonstrate that MAGE-L2-TRIM27 ubiquitin ligase activity is required for nucleation of endosomal F-actin by the WASH regulatory complex, a known regulator of retromer-mediated transport. Mechanistic studies showed that MAGE-L2-TRIM27 facilitates K63-linked ubiquitination of WASH K220. Significantly, disruption of WASH ubiquitination impaired endosomal F-actin nucleation and retromer-dependent transport. These findings provide a cellular and molecular function for MAGE-L2-TRIM27 in retrograde transport, including an unappreciated role of K63-linked ubiquitination and identification of an activating signal of the WASH regulatory complex.
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