5U77

Crystal structure of ORP8 PH domain

  • Classification: LIPID TRANSPORT
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli BL21(DE3)
  • Mutation(s): No 

  • Deposited: 2016-12-11 Released: 2017-10-18 
  • Deposition Author(s): Ghai, R., Yang, H.
  • Funding Organization(s): NHMRC-ARC dementia research development fellowship, National Health and Medical Research Council (NHMRC, Australia), Australian Research Council (ARC)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

ORP5 and ORP8 bind phosphatidylinositol-4, 5-biphosphate (PtdIns(4,5)P 2) and regulate its level at the plasma membrane.

Ghai, R.Du, X.Wang, H.Dong, J.Ferguson, C.Brown, A.J.Parton, R.G.Wu, J.W.Yang, H.

(2017) Nat Commun 8: 757-757

  • DOI: https://doi.org/10.1038/s41467-017-00861-5
  • Primary Citation of Related Structures:  
    5U77, 5U78

  • PubMed Abstract: 

    ORP5 and ORP8, members of the oxysterol-binding protein (OSBP)-related proteins (ORP) family, are endoplasmic reticulum membrane proteins implicated in lipid trafficking. ORP5 and ORP8 are reported to localize to endoplasmic reticulum-plasma membrane junctions via binding to phosphatidylinositol-4-phosphate (PtdIns(4)P), and act as a PtdIns(4)P/phosphatidylserine counter exchanger between the endoplasmic reticulum and plasma membrane. Here we provide evidence that the pleckstrin homology domain of ORP5/8 via PtdIns(4,5)P 2 , and not PtdIns(4)P binding mediates the recruitment of ORP5/8 to endoplasmic reticulum-plasma membrane contact sites. The OSBP-related domain of ORP8 can extract and transport multiple phosphoinositides in vitro, and knocking down both ORP5 and ORP8 in cells increases the plasma membrane level of PtdIns(4,5)P 2 with little effect on PtdIns(4)P. Overall, our data show, for the first time, that phosphoinositides other than PtdIns(4)P can also serve as co-exchangers for the transport of cargo lipids by ORPs.ORP5/8 are endoplasmic reticulum (ER) membrane proteins implicated in lipid trafficking that localize to ER-plasma membrane (PM) contacts and maintain membrane homeostasis. Here the authors show that PtdIns(4,5)P 2 plays a critical role in the targeting and function of ORP5/8 at the PM.


  • Organizational Affiliation

    School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, 2052, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxysterol-binding protein-related protein 8123Homo sapiensMutation(s): 0 
Gene Names: OSBPL8KIAA1451ORP8OSBP10
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BZF1 (Homo sapiens)
Explore Q9BZF1 
Go to UniProtKB:  Q9BZF1
PHAROS:  Q9BZF1
GTEx:  ENSG00000091039 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BZF1
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.079α = 90
b = 57.079β = 90
c = 154.949γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
NHMRC-ARC dementia research development fellowshipAustralia1097185
National Health and Medical Research Council (NHMRC, Australia)Australia1041301
Australian Research Council (ARC)AustraliaDP130100457

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-18
    Type: Initial release
  • Version 1.1: 2018-01-17
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description