6Q0X

The cryo-EM structure of the SNX-BAR Mvp1 tetramer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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This is version 1.1 of the entry. See complete history


Literature

The cryo-EM structure of the SNX-BAR Mvp1 tetramer.

Sun, D.Varlakhanova, N.V.Tornabene, B.A.Ramachandran, R.Zhang, P.Ford, M.G.J.

(2020) Nat Commun 11: 1506-1506

  • DOI: https://doi.org/10.1038/s41467-020-15110-5
  • Primary Citation of Related Structures:  
    6Q0X

  • PubMed Abstract: 

    Sorting nexins (SNX) are a family of PX domain-containing proteins with pivotal roles in trafficking and signaling. SNX-BARs, which also have a curvature-generating Bin/Amphiphysin/Rvs (BAR) domain, have membrane-remodeling functions, particularly at the endosome. The minimal PX-BAR module is a dimer mediated by BAR-BAR interactions. Many SNX-BAR proteins, however, additionally have low-complexity N-terminal regions of unknown function. Here, we present the cryo-EM structure of the full-length SNX-BAR Mvp1, which is an autoinhibited tetramer. The tetramer is a dimer of dimers, wherein the membrane-interacting BAR surfaces are sequestered and the PX lipid-binding sites are occluded. The N-terminal low-complexity region of Mvp1 is essential for tetramerization. Mvp1 lacking its N-terminus is dimeric and exhibits enhanced membrane association. Membrane binding and remodeling by Mvp1 therefore requires unmasking of the PX and BAR domain lipid-interacting surfaces. This work reveals a tetrameric configuration of a SNX-BAR protein that provides critical insight into SNX-BAR function and regulation.


  • Organizational Affiliation

    Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15261, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sorting nexin MVP1
A, B, C, D
531Saccharomyces cerevisiae W303Mutation(s): 0 
Gene Names: MVP1YMR004WYM8270.06
Membrane Entity: Yes 
UniProt
Find proteins for P40959 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P40959 
Go to UniProtKB:  P40959
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP40959
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.16

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM120102
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesU24GM116790

Revision History  (Full details and data files)

  • Version 1.0: 2020-04-01
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references, Refinement description