Crystal Structure of Epiphyas postvittana Takeout 1 expressed in Sf9 cells

Experimental Data Snapshot

  • Resolution: 2.19 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.198 

Starting Model: experimental
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Ligand promiscuity within the internal cavity of Epiphyas postvittana Takeout 1 protein.

Hamiaux, C.Basten, L.Greenwood, D.R.Baker, E.N.Newcomb, R.D.

(2013) J Struct Biol 182: 259-263

  • DOI: https://doi.org/10.1016/j.jsb.2013.03.013
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Takeout proteins are found across a diverse range of insect species and are thought to be involved in important aspects of insect physiology and behavior. These proteins act as ligand carriers, but the nature of their endogenous ligands remains unknown. The crystal structure of Epiphyas postvittana Takeout 1 (EpTo1), the only structure for any Takeout protein to date, revealed an α/β-wrap fold with a purely hydrophobic internal cavity of tubular shape. When recombinantly expressed in Escherichia coli, we previously showed that a surrogate ubiquinone-8 ligand binds within the internal cavity of EpTo1 with excellent shape complementarity. We have now expressed EpTo1 in an insect cell expression system devoid of ubiquinone-8, and solved its crystal structure at 2.2Å resolution. Using combined information from crystallography and mass spectrometry, we identify a mixture of fatty acid moieties, mostly myristic and palmitic acid, bound inside the EpTo1 cavity, mimicking the structure of the longer ubiquinone-8 compound. No significant alteration of the internal cavity was observed regardless of the bound ligands, ubiquinone-8 or fatty acids, suggesting that the internal cavity of EpTo1 forms a rigid scaffold that imposes strict structural constraints for selectivity and specificity of ligand(s) in vivo.

  • Organizational Affiliation

    The New Zealand Institute for Plant & Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand. cyril.hamiaux@plantandfood.co.nz

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Takeout-like protein 1
A, B
220Epiphyas postvittanaMutation(s): 0 
Gene Names: takeout 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
Experimental Data & Validation

Experimental Data

  • Resolution: 2.19 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.835α = 90
b = 55.184β = 90.22
c = 87.279γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-01
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description