View source for 1kx9

[[Image:1kx9.gif|left|200px]]

 {{Structure
|PDB= 1kx9 |SIZE=350|CAPTION= <scene name='initialview01'>1kx9</scene>, resolution 1.65&Aring;
|SITE= 
|LIGAND= <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>
|ACTIVITY= 
|GENE= 
|DOMAIN=
|RELATEDENTRY=[[1kx8|1KX8]]
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kx9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kx9 OCA], [http://www.ebi.ac.uk/pdbsum/1kx9 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1kx9 RCSB]</span>
}}

'''ANTENNAL CHEMOSENSORY PROTEIN A6 FROM THE MOTH MAMESTRA BRASSICAE'''


==Overview==
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.

==About this Structure==
1KX9 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mamestra_brassicae Mamestra brassicae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KX9 OCA]. 

==Reference==
X-ray structure and ligand binding study of a moth chemosensory protein., Lartigue A, Campanacci V, Roussel A, Larsson AM, Jones TA, Tegoni M, Cambillau C, J Biol Chem. 2002 Aug 30;277(35):32094-8. Epub 2002 Jun 14. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12068017 12068017]
[[Category: Mamestra brassicae]]
[[Category: Single protein]]
[[Category: Cambillau, C.]]
[[Category: Campanacci, V.]]
[[Category: Jones, T A.]]
[[Category: Larsson, A M.]]
[[Category: Lartigue, A.]]
[[Category: Roussel, A.]]
[[Category: Tegoni, M.]]
[[Category: all helix]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:54:57 2008''