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Identification of molecular heterogeneity in SNX27-retromer-mediated endosome-to-plasma membrane recycling
Abstract
Retromer is a protein assembly that orchestrates sorting of transmembrane cargo proteins into endosome-to-Golgi and endosome-to-plasma membrane transport pathways. Here, we have employed quantitative proteomics to define the interactome of human VPS35, the core retromer component. This has identified a number of new interacting proteins, including ankyrin-repeat domain 50 (ANKRD50), seriologically-defined colon cancer antigen 3 (SDCCAG3) and VPS9-ankyrin-repeat protein (VARP). Depletion of these proteins resulted in trafficking defects of retromer-dependent cargo, but differential and cargo specific effects suggested a surprising degree of functional heterogeneity in retromer-mediated endosome-to-plasma membrane sorting. Extending this, suppression of the retromer-associated WASH complex did not uniformly affect retromer cargo, thereby confirming cargo specific functions for retromer interacting proteins. Further analysis of the retromer-VARP interaction identified a role for retromer in endosome-to-melanosome transport. Suppression of VPS35 led to miss trafficking of the melanogenic enzymes, tyrosinase and tryrosine-related protein 1 (Tyrp1), establishing that retromer acts in concert with VARP in this trafficking pathway. Overall these data reveal hidden complexities in retromer-mediated sorting and open up new directions in our molecular understanding of this essential sorting complex.
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The Retromer sub-domain proximity proteome included the RAB7 GAP TBC1D5, the RAB21/RAB32/RAB38 GEF VARP, and the RAB10 GEFs DENND4A and DENND4C.
“These included known Retromer accessory proteins, the RAB7 GAP TBC1D546,77–81, the RAB21/RAB32/RAB38 GEF VARP (a.k.a. ANKRD27)47,48,82, and the RAB10 GEFs DENND4A and DENND4C83,84.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [48]
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Metadata
- Authors
- McGough, I. J., Steinberg, F., Gallon, M., Yatsu, A., Ohbayashi, N., Heesom, K. J., Fukuda, M., & Cullen, P. J.
- Venue
- Journal of Cell Science
- Publisher
- The Company of Biologists
- Published
- 2014-01-01
- ISSN
- 1477-9137
- 0021-9533
- PMC
- PMC4231307
- Cited by
- 87
- References
- 3
- Language
- en
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