3LH8 image
Deposition Date 2010-01-21
Release Date 2010-02-02
Last Version Date 2023-09-06
Entry Detail
PDB ID:
3LH8
Title:
Crystal structure of mouse VPS26B in spacegroup P41 21 2
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.29
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Vacuolar protein sorting-associated protein 26B
Gene (Uniprot):Vps26b
Mutations:L197S,R199E
Chain IDs:A, B
Chain Length:340
Number of Molecules:2
Biological Source:Mus musculus
Primary Citation
Assembly and solution structure of the core retromer protein complex.
Traffic 12 56 71 (2011)
PMID: 20875039 DOI: 10.1111/j.1600-0854.2010.01124.x

Abstact

Retromer is a peripheral membrane protein complex that has pleiotropic roles in endosomal membrane trafficking. The core of retromer possesses three subunits, VPS35, VPS29 and VPS26, that play different roles in binding to cargo, regulatory proteins and complex stabilization. We have performed an investigation of the thermodynamics of core retromer assembly using isothermal titration calorimetry (ITC) demonstrating that VPS35 acts as the central subunit to which VPS29 and VPS26 bind independently. Furthermore, we confirm that the conserved PRLYL motif of the large VPS35 subunit is critical for direct VPS26 interaction. Heat capacity measurements of VPS29 and VPS26 binding to VPS35 indicate extensive binding interfaces and suggest conformational alterations in VPS29 or VPS35 upon complex formation. Solution studies of the retromer core using small-angle X-ray scattering allow us to propose a model whereby VPS35 forms an extended platform with VPS29 and VPS26 bound at distal ends, with the potential for forming dimeric assemblies.

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