7DEJ

Structure of human ORP3 ORD in apo-form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of human ORP3 ORD reveals conservation of a key function and ligand specificity in OSBP-related proteins.

Tong, J.Tan, L.Im, Y.J.

(2021) PLoS One 16: e0248781-e0248781

  • DOI: https://doi.org/10.1371/journal.pone.0248781
  • Primary Citation of Related Structures:  
    7DEI, 7DEJ

  • PubMed Abstract: 

    Human ORP3 belongs to the oxysterol-binding protein (OSBP) family of lipid transfer proteins and is involved in lipid trafficking and cell signaling. ORP3 localizes to the ER-PM interfaces and is implicated in lipid transport and focal adhesion dynamics. Here, we report the 2.6-2.7 Å structures of the ORD (OSBP-related domain) of human ORP3 in apo-form and in complex with phosphatidylinositol 4-phosphate. The ORP3 ORD displays a helix grip β-barrel fold with a deep hydrophobic pocket which is conserved in the OSBP gene family. ORP3 binds PI(4)P by the residues around tunnel entrance and in the hydrophobic pocket, whereas it lacks sterol binding due to the narrow hydrophobic tunnel. The heterologous expression of the ORDs of human ORP3 or OSBP1 rescued the lethality of seven ORP (yeast OSH1-OSH7) knockout in yeast. In contrast, the PI(4)P-binding site mutant of ORP3 did not complement the OSH knockout cells. The N-terminal PH domain and FFAT motif of ORP3 are involved in protein targeting but are not essential in yeast complementation. This observation suggests that the essential function conserved in the ORPs of yeast and human is mediated by PI(4)P-binding of the ORD domain. This study suggests that the non-vesicular PI(4)P transport is a conserved function of all ORPs in eukaryotes.


  • Organizational Affiliation

    College of Pharmacy, Chonnam National University, Gwangju, Republic of Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxysterol-binding protein-related protein 3
A, B
388Homo sapiensMutation(s): 3 
Gene Names: OSBPL3KIAA0704ORP3OSBP3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H4L5 (Homo sapiens)
Explore Q9H4L5 
Go to UniProtKB:  Q9H4L5
PHAROS:  Q9H4L5
GTEx:  ENSG00000070882 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H4L5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.912α = 90
b = 95.912β = 90
c = 188.897γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXrefinement
Cootmodel building
HKL-2000data scaling
PHASERphasing
HKL-2000data reduction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic Of2019R1A2C1085530

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-24
    Type: Initial release
  • Version 1.1: 2021-04-28
    Changes: Database references
  • Version 1.2: 2021-05-05
    Changes: Database references
  • Version 1.3: 2023-11-29
    Changes: Data collection, Database references, Refinement description