1N8U

Chemosensory Protein in Complex with bromo-dodecanol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Moth chemosensory protein exhibits drastic conformational changes and cooperativity on ligand binding.

Campanacci, V.Lartigue, A.Hallberg, B.M.Jones, T.A.Giudici-Orticoni, M.T.Tegoni, M.Cambillau, C.

(2003) Proc.Natl.Acad.Sci.USA 100: 5069-5074

  • DOI: 10.1073/pnas.0836654100
  • Primary Citation of Related Structures:  1N8V

  • PubMed Abstract: 
  • Chemosensory proteins (CSPs) have been proposed to transport hydrophobic chemicals from air to olfactory or taste receptors. They have been isolated from several sensory organs of a wide range of insect species. The x-ray structure of CSPMbraA6, a 11 ...

    Chemosensory proteins (CSPs) have been proposed to transport hydrophobic chemicals from air to olfactory or taste receptors. They have been isolated from several sensory organs of a wide range of insect species. The x-ray structure of CSPMbraA6, a 112-aa antennal protein from the moth Mamestra brassicae (Mbra), was shown to exhibit a novel type of alpha-helical fold. We have performed a structural and binding study of CSPMbraA6 to get some insights into its possible molecular function. Tryptophan fluorescence quenching demonstrates the ability of CSPMbraA6 to bind several types of semio-chemicals or surrogate ligands with microM K(d). Its crystal structure in complex with one of these compounds, 12-bromo-dodecanol, reveals extensive conformational changes on binding, resulting in the formation of a large cavity filled by three ligand molecules. Furthermore, binding cooperativity was demonstrated for some ligands, suggesting a stepwise binding. The peculiar rearrangement of CSPMbraA6 conformation and the cooperativity phenomenon might trigger the recognition of chemicals by receptors and induce subsequent signal transduction.


    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, Unité Mixte de Recherche 6098, Centre National de la Recherche Scientifique and Universités d'Aix-Marseille I & II, 31 Chemin J. Aiguier, 13402 Marseille Cedex 20, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
chemosensory protein
A
112Mamestra brassicaeN/A
Find proteins for Q9NG96 (Mamestra brassicae)
Go to UniProtKB:  Q9NG96
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BDD
Query on BDD

Download SDF File 
Download CCD File 
A
BROMO-DODECANOL
C12 H25 Br O
ASIDMJNTHJYVQJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BDDKd: 930 nM BINDINGMOAD
BDDKd: 930 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.184 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 61.529α = 90.00
b = 54.579β = 116.59
c = 33.226γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
DENZOdata reduction
REFMACrefinement
CCP4data scaling
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-01
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance