Abstract
The mammalian retromer complex consists of SNX1, SNX2, Vps26, Vps29 and Vps35, and retrieves lysosomal enzyme receptors from endosomes to the trans-Golgi network. The structure of human Vps26A at 2.1-Å resolution reveals two curved β-sandwich domains connected by a polar core and a flexible linker. Vps26 has an unpredicted structural relationship to arrestins. The Vps35-binding site on Vps26 maps to a mobile loop spanning residues 235–246, near the tip of the C-terminal domain. The loop is phylogenetically conserved and provides a mechanism for Vps26 integration into the complex that leaves the rest of the structure free for engagements with membranes and for conformational changes. Hydrophobic residues and a glycine in this loop are required for integration into the retromer complex and endosomal localization of human Vps26, and for the function of yeast Vps26 in carboxypeptidase Y sorting.
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Acknowledgements
We thank B. Beach and X. Zhu for technical assistance, W. Smith for liposome binding studies, H. Watson and C. Bonangelino for advice on CPY-sorting assays, C. Haft for reagents and comments on the manuscript and D. Hurt, G. Miller and the staff of beamline 22-ID, APS, Argonne National Laboratory for assistance with X-ray data collection. This research was supported by the US National Institutes of Health through the intramural programs of the National Institute of Diabetes and Digestive and Kidney Diseases (to J.H.H.) and the National Institute of Child Health and Human Development (to J.S.B.). Use of the APS was supported by the US Department of Energy, Basic Energy Sciences, Office of Science, under contract no.W-31-109-Eng-38.
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Supplementary Fig. 1
Electron density (PDF 2327 kb)
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Crystal packing (PDF 4160 kb)
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Shi, H., Rojas, R., Bonifacino, J. et al. The retromer subunit Vps26 has an arrestin fold and binds Vps35 through its C-terminal domain. Nat Struct Mol Biol 13, 540–548 (2006). https://doi.org/10.1038/nsmb1103
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DOI: https://doi.org/10.1038/nsmb1103
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