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Human orthologs of yeast vacuolar protein sorting proteins Vps26, 29, and 35: assembly into multimeric complexes.

Authors: Haft, CR  De la Luz Sierra, M  Bafford, R  Lesniak, MA  Barr, VA  Taylor, SI 
Citation: Haft CR, etal., Mol Biol Cell. 2000 Dec;11(12):4105-16.
Pubmed: (View Article at PubMed) PMID:11102511

Sorting nexin (SNX) 1 and SNX2 are mammalian orthologs of Vps5p, a yeast protein that is a subunit of a large multimeric complex, termed the retromer complex, involved in retrograde transport of proteins from endosomes to the trans-Golgi network. We report the cloning and characterization of human orthologs of three additional components of the complex: Vps26p, Vps29p, and Vps35p. The close structural similarity between the yeast and human proteins suggests a similarity in function. We used both yeast two-hybrid assays and expression in mammalian cells to define the binding interactions among these proteins. The data suggest a model in which hVps35 serves as the core of a multimeric complex by binding directly to hVps26, hVps29, and SNX1. Deletional analyses of hVps35 demonstrate that amino acid residues 1-53 and 307-796 of hVps35 bind to the coiled coil-containing domain of SNX1. In contrast, hVps26 binds to amino acid residues 1-172 of hVps35, whereas hVps29 binds to amino acid residues 307-796 of hVps35. Furthermore, hVps35, hVps29, and hVps26 have been found in membrane-associated and cytosolic compartments. Gel filtration chromatography of COS7 cell cytosol showed that both recombinant and endogenous hVps35, hVps29, and hVps26 coelute as a large complex ( approximately 220-440 kDa). In the absence of hVps35, neither hVps26 nor hVps29 is found in the large complex. These data provide the first insights into the binding interactions among subunits of a putative mammalian retromer complex.


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CRRD Object Information
CRRD ID: 10412293
Created: 2015-11-14
Species: All species
Last Modified: 2015-11-14
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.