6GQF

The structure of mouse AsterA (GramD1a) with 25-hydroxy cholesterol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Aster Proteins Facilitate Nonvesicular Plasma Membrane to ER Cholesterol Transport in Mammalian Cells.

Sandhu, J.Li, S.Fairall, L.Pfisterer, S.G.Gurnett, J.E.Xiao, X.Weston, T.A.Vashi, D.Ferrari, A.Orozco, J.L.Hartman, C.L.Strugatsky, D.Lee, S.D.He, C.Hong, C.Jiang, H.Bentolila, L.A.Gatta, A.T.Levine, T.P.Ferng, A.Lee, R.Ford, D.A.Young, S.G.Ikonen, E.Schwabe, J.W.R.Tontonoz, P.

(2018) Cell 175: 514-529.e20

  • DOI: https://doi.org/10.1016/j.cell.2018.08.033
  • Primary Citation of Related Structures:  
    6GQF

  • PubMed Abstract: 

    The mechanisms underlying sterol transport in mammalian cells are poorly understood. In particular, how cholesterol internalized from HDL is made available to the cell for storage or modification is unknown. Here, we describe three ER-resident proteins (Aster-A, -B, -C) that bind cholesterol and facilitate its removal from the plasma membrane. The crystal structure of the central domain of Aster-A broadly resembles the sterol-binding fold of mammalian StARD proteins, but sequence differences in the Aster pocket result in a distinct mode of ligand binding. The Aster N-terminal GRAM domain binds phosphatidylserine and mediates Aster recruitment to plasma membrane-ER contact sites in response to cholesterol accumulation in the plasma membrane. Mice lacking Aster-B are deficient in adrenal cholesterol ester storage and steroidogenesis because of an inability to transport cholesterol from SR-BI to the ER. These findings identify a nonvesicular pathway for plasma membrane to ER sterol trafficking in mammals.


  • Organizational Affiliation

    Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GRAM domain-containing protein 1A
A, B, C, D
231Mus musculusMutation(s): 0 
Gene Names: Gramd1aD7Bwg0611eKiaa1533
Membrane Entity: Yes 
UniProt
Find proteins for Q8VEF1 (Mus musculus)
Explore Q8VEF1 
Go to UniProtKB:  Q8VEF1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8VEF1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.435α = 90
b = 121.012β = 110.84
c = 71.907γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited KingdomWT100237
Royal SocietyUnited KingdomWolfson Research Merit award

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 1.3: 2024-10-16
    Changes: Structure summary