6VAC image
Entry Detail
PDB ID:
6VAC
EMDB ID:
Title:
Mouse retromer (VPS26/VPS35/VPS29) heterotrimer
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-12-17
Release Date:
2020-02-19
Method Details:
Experimental Method:
Resolution:
5.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Vacuolar protein sorting-associated protein 35
Chain IDs:A
Chain Length:796
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Vacuolar protein sorting-associated protein 26A
Chain IDs:B
Chain Length:327
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Vacuolar protein sorting-associated protein 29
Chain IDs:C
Chain Length:182
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Mammalian Retromer Is an Adaptable Scaffold for Cargo Sorting from Endosomes.
Structure 28 393 405.e4 (2020)
PMID: 32027819 DOI: 10.1016/j.str.2020.01.009

Abstact

Metazoan retromer (VPS26/VPS35/VPS29) associates with sorting nexins on endosomal tubules to sort proteins to the trans-Golgi network or plasma membrane. Mechanisms of metazoan retromer assembly remain undefined. We combine single-particle cryoelectron microscopy with biophysical methods to uncover multiple oligomer structures. 2D class averages reveal mammalian heterotrimers; dimers of trimers; tetramers of trimers; and flat chains. These species are further supported by biophysical solution studies. We provide reconstructions of all species, including key sub-structures (∼5 Å resolution). Local resolution variation suggests that heterotrimers and dimers adopt multiple conformations. Our structures identify a flexible, highly conserved electrostatic dimeric interface formed by VPS35 subunits. We generate structure-based mutants to disrupt this interface in vitro. Equivalent mutations in yeast demonstrate a mild cargo-sorting defect. Our data suggest the metazoan retromer is an adaptable and plastic scaffold that accommodates interactions with different sorting nexins to sort multiple cargoes from endosomes their final destinations.

Legend

Protein

Chemical

Disease

Primary Citation of related structures