期刊
JOURNAL OF CELL SCIENCE
卷 123, 期 21, 页码 3703-3717出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.071472
关键词
Retromer; Endosome; Tubule; Recruitment; Strumpellin
类别
资金
- MRC
- Wellcome Trust
- MRC [G0701444] Funding Source: UKRI
- Medical Research Council [G0701444, G0700750] Funding Source: researchfish
The retromer complex is required for the efficient endosome-to-Golgi retrieval of the CIMPR, sortilin, SORL1, wntless and other physiologically important membrane proteins. Retromer comprises two protein complexes that act together in endosome-to-Golgi retrieval; the cargo-selective complex is a trimer of VPS35, VPS29 and VPS26 that sorts cargo into tubules for retrieval to the Golgi. Tubules are produced by the oligomerization of sorting nexin dimers. Here, we report the identification of five endosomally-localised proteins that modulate tubule formation and are recruited to the membrane via interactions with the cargo-selective retromer complex. One of the retromer-interacting proteins, strumpellin, is mutated in hereditary spastic paraplegia, a progressive length-dependent axonopathy. Here, we show that strumpellin regulates endosomal tubules as part of a protein complex with three other proteins that include WASH1, an actin-nucleating promoting factor. Therefore, in addition to a direct role in endosome-to-Golgi retrieval, the cargo-selective retromer complex also acts as a platform for recruiting physiologically important proteins to endosomal membranes that regulate membrane tubule dynamics.
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