1i9b

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[[Image:1i9b.gif|left|200px]]
[[Image:1i9b.gif|left|200px]]
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{{Structure
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The line below this paragraph, containing "STRUCTURE_1i9b", creates the "Structure Box" on the page.
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|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EPE:4-(2-HYDROXYETHYL)-1-PIPERAZINE+ETHANESULFONIC+ACID'>EPE</scene>
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{{STRUCTURE_1i9b| PDB=1i9b | SCENE= }}
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1i9b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i9b OCA], [http://www.ebi.ac.uk/pdbsum/1i9b PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1i9b RCSB]</span>
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'''X-RAY STRUCTURE OF ACETYLCHOLINE BINDING PROTEIN (ACHBP)'''
'''X-RAY STRUCTURE OF ACETYLCHOLINE BINDING PROTEIN (ACHBP)'''
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[[Category: Sixma, T K.]]
[[Category: Sixma, T K.]]
[[Category: Smit, A B.]]
[[Category: Smit, A B.]]
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[[Category: igg fold]]
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[[Category: Igg fold]]
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[[Category: pentamer]]
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[[Category: Pentamer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:43:57 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:16:28 2008''
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Revision as of 16:43, 2 May 2008

Image:1i9b.gif

Template:STRUCTURE 1i9b

X-RAY STRUCTURE OF ACETYLCHOLINE BINDING PROTEIN (ACHBP)


Overview

Pentameric ligand gated ion-channels, or Cys-loop receptors, mediate rapid chemical transmission of signals. This superfamily of allosteric transmembrane proteins includes the nicotinic acetylcholine (nAChR), serotonin 5-HT3, gamma-aminobutyric-acid (GABAA and GABAC) and glycine receptors. Biochemical and electrophysiological information on the prototypic nAChRs is abundant but structural data at atomic resolution have been missing. Here we present the crystal structure of molluscan acetylcholine-binding protein (AChBP), a structural and functional homologue of the amino-terminal ligand-binding domain of an nAChR alpha-subunit. In the AChBP homopentamer, the protomers have an immunoglobulin-like topology. Ligand-binding sites are located at each of five subunit interfaces and contain residues contributed by biochemically determined 'loops' A to F. The subunit interfaces are highly variable within the ion-channel family, whereas the conserved residues stabilize the protomer fold. This AChBP structure is relevant for the development of drugs against, for example, Alzheimer's disease and nicotine addiction.

About this Structure

1I9B is a Single protein structure of sequence from Lymnaea stagnalis. Full crystallographic information is available from OCA.

Reference

Crystal structure of an ACh-binding protein reveals the ligand-binding domain of nicotinic receptors., Brejc K, van Dijk WJ, Klaassen RV, Schuurmans M, van Der Oost J, Smit AB, Sixma TK, Nature. 2001 May 17;411(6835):269-76. PMID:11357122 Page seeded by OCA on Fri May 2 19:43:57 2008

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