1KX8

Antennal Chemosensory Protein A6 from Mamestra brassicae, tetragonal form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.265 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

X-Ray Structure and Ligand Binding Study of a Chemosensory Protein

Lartigue, A.Campanacci, V.Roussel, A.Larsson, A.M.Jones, T.A.Tegoni, M.Cambillau, C.

(2002) J Biol Chem 277: 32094-32098

  • DOI: 10.1074/jbc.M204371200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Chemosensory proteins (CSPs) are believed to be involved in chemical communication and perception. Such proteins, of M(r) 13,000, have been isolated from several sensory organs of a wide range of insect species. Several CSPs have been identified in t ...

    Chemosensory proteins (CSPs) are believed to be involved in chemical communication and perception. Such proteins, of M(r) 13,000, have been isolated from several sensory organs of a wide range of insect species. Several CSPs have been identified in the antennae and proboscis of the moth Mamestra brassicae. One of them, CSPMbraA6, a 112-amino acid antennal protein, has been expressed in large quantities and is soluble in the Escherichia coli periplasm. X-ray structure determination has been performed in parallel with ligand binding assays using tryptophan fluorescence quenching. The protein has overall dimensions of 25 x 30 x 32 A and exhibits a novel type of alpha-helical fold with six helices connected by alpha-alpha loops. A narrow channel extends within the protein hydrophobic core. Fluorescence quenching with brominated alkyl alcohols or fatty acids and modeling studies indicates that CSPMbraA6 is able to bind such compounds with C12-18 alkyl chains. These ubiquitous proteins might have the role of extracting hydrophobic linear compounds (pheromones, odors, or fatty acids) dispersed in the phospholipid membrane and transporting them to their receptor.


    Related Citations: 
    • Chemosensory Protein from the Moth Mamestra brassicae. Expression and Secondary Structure from 1H and 15N NMR
      Campanacci, V., Mosbah, A., Bornet, O., Wechselberger, R., Jacquin-Joly, E., Cambillau, C., Darbon, H., Tegoni, M.
      (2001) Eur J Biochem 268: 4731
    • Recombinant Chemosensory Protein (CSP2) from the moth Mamestra brassicae: Crystallization and Preliminary Crystallographic Study
      Campanacci, V., Spinelli, S., Lartigue, A., Lewandowski, C., Brown, K., Tegoni, M., Cambillau, C.
      (2001) Acta Crystallogr D Biol Crystallogr 57: 137

    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, UMR 6098, CNRS and Universités d'Aix-Marseille I and II, 31 chemin J. Aiguier, 13402 Marseille Cedex 20, France.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHEMOSENSORY PROTEIN A6
A
112Mamestra brassicaeMutation(s): 0 
Find proteins for Q9NG96 (Mamestra brassicae)
Go to UniProtKB:  Q9NG96
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.265 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.406α = 90
b = 69.406β = 90
c = 79.645γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
SOLVEphasing
CNSrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance