1ZHX

Structure of yeast oxysterol binding protein Osh4 in complex with 25-hydroxycholesterol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

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This is version 1.2 of the entry. See complete history


Literature

Structural mechanism for sterol sensing and transport by OSBP-related proteins

Im, Y.J.Raychaudhuri, S.Prinz, W.A.Hurley, J.H.

(2005) Nature 437: 154-158

  • DOI: 10.1038/nature03923
  • Primary Citation of Related Structures:  
    1ZHT, 1ZHW, 1ZHX, 1ZHY, 1ZHZ, 1ZI7

  • PubMed Abstract: 
  • The oxysterol-binding-protein (OSBP)-related proteins (ORPs) are conserved from yeast to humans, and are implicated in the regulation of sterol homeostasis and in signal transduction pathways. Here we report the structure of the full-length yeast ORP Osh4 (also known as Kes1) at 1 ...

    The oxysterol-binding-protein (OSBP)-related proteins (ORPs) are conserved from yeast to humans, and are implicated in the regulation of sterol homeostasis and in signal transduction pathways. Here we report the structure of the full-length yeast ORP Osh4 (also known as Kes1) at 1.5-1.9 A resolution in complexes with ergosterol, cholesterol, and 7-, 20- and 25-hydroxycholesterol. We find that a single sterol molecule binds within a hydrophobic tunnel in a manner consistent with a transport function for ORPs. The entrance is blocked by a flexible amino-terminal lid and surrounded by basic residues that are critical for Osh4 function. The structure of the open state of a lid-truncated form of Osh4 was determined at 2.5 A resolution. Structural analysis and limited proteolysis show that sterol binding closes the lid and stabilizes a conformation favouring transport across aqueous barriers and signal transmission. The structure of Osh4 in the absence of ligand exposes potential phospholipid-binding sites that are positioned for membrane docking and sterol exchange. On the basis of these observations, we propose a model in which sterol and membrane binding promote reciprocal conformational changes that facilitate a sterol transfer and signalling cycle.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institutes of Health, US Department of Health and Human Services, Bethesda, Maryland 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
KES1 proteinA438Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: OSH4
Membrane Entity: Yes 
UniProt
Find proteins for P35844 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P35844 
Go to UniProtKB:  P35844
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HC3 (Subject of Investigation/LOI)
Query on HC3

Download Ideal Coordinates CCD File 
B [auth A]25-HYDROXYCHOLESTEROL
C27 H46 O2
INBGSXNNRGWLJU-ZHHJOTBYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
HC3 Binding MOAD:  1ZHX Kd: 55 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.6α = 90
b = 95.17β = 96.81
c = 65.57γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-06
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance