Crystal Structure of Epiphyas postvittana Takeout 1

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.187 

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Crystal structure of Epiphyas postvittana takeout 1 with bound ubiquinone supports a role as ligand carriers for takeout proteins in insects

Hamiaux, C.Stanley, D.Greenwood, D.R.Baker, E.N.Newcomb, R.D.

(2009) J Biol Chem 284: 3496-3503

  • DOI: https://doi.org/10.1074/jbc.M807467200
  • Primary Citation of Related Structures:  
    3E8T, 3E8W

  • PubMed Abstract: 

    Takeout (To) proteins are found exclusively in insects and have been proposed to have important roles in various aspects of their physiology and behavior. Limited sequence similarity with juvenile hormone-binding proteins (JHBPs), which specifically bind and transport juvenile hormones in Lepidoptera, suggested a role for To proteins in binding hydrophobic ligands. We present the first crystal structure of a To protein, EpTo1 from the light brown apple moth Epiphyas postvittana, solved in-house by the single-wavelength anomalous diffraction technique using sulfur anomalous dispersion, and refined to 1.3 angstroms resolution. EpTo1 adopts the unusual alpha/beta-wrap fold, seen only for JHBP and several mammalian lipid carrier proteins, a scaffold tailored for the binding and/or transport of hydrophobic ligands. EpTo1 has a 45 angstroms long, purely hydrophobic, internal tunnel that extends for the full length of the protein and accommodates a bound ligand. The latter was shown by mass spectrometry to be ubiquinone-8 and is probably derived from Escherichia coli. The structure provides the first direct experimental evidence that To proteins are ligand carriers; gives insights into the nature of endogenous ligand(s) of EpTo1; shows, by comparison with JHBP, a basis for different ligand specificities; and suggests a mechanism for the binding/release of ligands.

  • Organizational Affiliation

    The Horticulture and Food Research Institute of New Zealand Limited (HortResearch), Private Bag 92169, Auckland 1142, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Takeout-like protein 1220Epiphyas postvittanaMutation(s): 0 
Gene Names: takeout-like 1
Find proteins for B5ABT1 (Epiphyas postvittana)
Explore B5ABT1 
Go to UniProtKB:  B5ABT1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB5ABT1
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on UQ8

Download Ideal Coordinates CCD File 
B [auth A]Ubiquinone-8
C49 H74 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.043α = 90
b = 54.051β = 90
c = 83.577γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction
MAR345dtbdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary