4F7F

Structure of Anopheles gambiae odorant binding protein 20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

A novel mechanism of ligand binding and release in the odorant binding protein 20 from the malaria mosquito Anopheles gambiae.

Ziemba, B.P.Murphy, E.J.Edlin, H.T.Jones, D.N.

(2013) Protein Sci 22: 11-21

  • DOI: https://doi.org/10.1002/pro.2179
  • Primary Citation of Related Structures:  
    3V2L, 3VB1, 4F7F

  • PubMed Abstract: 

    Anopheles gambiae mosquitoes that transmit malaria are attracted to humans by the odor molecules that emanate from skin and sweat. Odorant binding proteins (OBPs) are the first component of the olfactory apparatus to interact with odorant molecules, and so present potential targets for preventing transmission of malaria by disrupting the normal olfactory responses of the insect. AgamOBP20 is one of a limited subset of OBPs that it is preferentially expressed in female mosquitoes and its expression is regulated by blood feeding and by the day/night light cycles that correlate with blood-feeding behavior. Analysis of AgamOBP20 in solution reveals that the apo-protein exhibits significant conformational heterogeneity but the binding of odorant molecules results in a significant conformational change, which is accompanied by a reduction in the conformational flexibility present in the protein. Crystal structures of the free and bound states reveal a novel pathway for entrance and exit of odorant molecules into the central-binding pocket, and that the conformational changes associated with ligand binding are a result of rigid body domain motions in α-helices 1, 4, and 5, which act as lids to the binding pocket. These structures provide new insights into the specific residues involved in the conformational adaptation to different odorants and have important implications in the selection and development of reagents targeted at disrupting normal OBP function.


  • Organizational Affiliation

    Department of Pharmacology, University of Colorado School of Medicine, Aurora, Colorado 80045, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AGAP005208-PA
A, B, C, D
120Anopheles gambiaeMutation(s): 0 
Gene Names: OBP20AgaP_AGAP005208
UniProt
Find proteins for Q7Q9J3 (Anopheles gambiae)
Explore Q7Q9J3 
Go to UniProtKB:  Q7Q9J3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7Q9J3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.794α = 90
b = 36.374β = 91.22
c = 96.154γ = 90
Software Package:
Software NamePurpose
JBluIce-EPICSdata collection
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-17
    Type: Initial release
  • Version 1.1: 2012-11-07
    Changes: Database references
  • Version 1.2: 2012-12-26
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description, Structure summary
  • Version 1.4: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description