1Z5X

hemipteran ecdysone receptor ligand-binding domain complexed with ponasterone A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.07 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The X-ray structure of a hemipteran ecdysone receptor ligand-binding domain: comparison with a lepidopteran ecdysone receptor ligand-binding domain and implications for insecticide design.

Carmichael, J.A.Lawrence, M.C.Graham, L.D.Pilling, P.A.Epa, V.C.Noyce, L.Lovrecz, G.Winkler, D.A.Pawlak-Skrzecz, A.Eaton, R.E.Hannan, G.N.Hill, R.J.

(2005) J Biol Chem 280: 22258-22269

  • DOI: 10.1074/jbc.M500661200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The ecdysone receptor is a hormone-dependent transcription factor that plays a central role in regulating the expression of vast networks of genes during development and reproduction in the phylum Arthropoda. The functional receptor is a heterodimer ...

    The ecdysone receptor is a hormone-dependent transcription factor that plays a central role in regulating the expression of vast networks of genes during development and reproduction in the phylum Arthropoda. The functional receptor is a heterodimer of the two nuclear receptor proteins ecdysone receptor (EcR) and ultraspiracle protein. The receptor is the target of the environmentally friendly bisacylhydrazine insecticides, which are effective against Lepidoptera but not against Hemiptera or several other insect orders. Here we present evidence indicating that much of the selectivity of the bisacylhydrazine insecticides can be studied at the level of their binding to purified ecdysone receptor ligand-binding domain (LBD) heterodimers. We report the crystal structure of the ecdysone receptor LBD heterodimer of the hemipteran Bemisia tabaci (Bt, sweet potato whitefly) in complex with the ecdysone analogue ponasterone A. Although comparison with the corresponding known LBD structure from the lepidopteran Heliothis virescens (Hv) ecdysone receptor revealed the overall mode of ponasterone A binding to be very similar in the two cases, we observed that the BtEcR ecdysteroid-binding pocket is structured differently to that of HvEcR in those parts that are not in contact with ponasterone A. We suggest that these differences in the ligand-binding pocket may provide a molecular basis for the taxonomic order selectivity of bisacylhydrazine insecticides.


    Organizational Affiliation

    CSIRO Health Sciences and Nutrition, 343 Royal Parade, Parkville, Victoria 3052, Australia.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ultraspiracle protein (USP) a homologue of RXR
U
262Bemisia tabaciMutation(s): 0 
Gene Names: Usp
Protein Feature View
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ecdysone receptor ligand binding domain
E
310Bemisia tabaciMutation(s): 0 
Gene Names: Ecr
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
P1A
Query on P1A

Download CCD File 
E
2,3,14,20,22-PENTAHYDROXYCHOLEST-7-EN-6-ONE
C27 H44 O6
PJYYBCXMCWDUAZ-JJJZTNILSA-N
 Ligand Interaction
PO4
Query on PO4

Download CCD File 
E, U
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.07 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.005α = 90
b = 143.005β = 90
c = 84.015γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CCP4phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-04-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description