2BJ0

Crystal Structure of AChBP from Bulinus truncatus revals the conserved structural scaffold and sites of variation in nicotinic acetylcholine receptors

Summary for 2BJ0

• Entry DOI: 10.2210/pdb2bj0/pdb
• Descriptor: ACETYLCHOLINE-BINDING PROTEIN, 3-CYCLOHEXYL-1-PROPYLSULFONIC ACID (3 entities in total)
• Functional Keywords: glycoprotein, glycprotein, igg fold, immunoglobulin domain, pentamer
• Biological source: BULINUS TRUNCATUS
• Total number of polymer chains: 5
• Total formula weight: 115429.73

Authors

Celie, P.H.N.,Klaassen, R.V.,Van Rossum-Fikkert, S.E.,Van Elk, R.,Van Nierop, P.,Smit, A.B.,Sixma, T.K. (deposition date: 2005-01-27, release date: 2005-05-24, Last modification date: 2024-10-23)

Primary citation

Celie, P.H.N.,Klaassen, R.V.,Van Rossum-Fikkert, S.E.,Van Elk, R.,Van Nierop, P.,Smit, A.B.,Sixma, T.K.
Crystal Structure of Acetylcholine-Binding Protein from Bulinus Truncatus Reveals the Conserved Structural Scaffold and Sites of Variation in Nicotinic Acetylcholine Receptors.
J.Biol.Chem., 280:26457-, 2005

PubMed Abstract: The crystal structure of acetylcholine-binding protein (AChBP) from the mollusk Lymnaea stagnalis is the established model for the ligand binding domains of the ligand-gated ion channel family, which includes nicotinic acetylcholine, 5-hydroxytryptamine (5-HT3), gamma-aminobutyric acid (GABA), types A and C, and glycine receptors. Here we present the crystal structure of a remote homolog, AChBP from Bulinus truncatus, which reveals both the conserved structural scaffold and the sites of variation in this receptor family. These include rigid body movements of loops that are close to the transmembrane interface in the receptors and changes in the intermonomer contacts, which alter the pentamer stability drastically. Structural, pharmacological and mutational analysis of both AChBPs shows how 3 amino acid changes in the binding site contribute to a 5-10-fold difference in affinity for nicotinic ligands. Comparison of these structures will be valuable for improving structure-function studies of ligand-gated ion channel receptors, including signal transduction, homology modeling, and drug design.

PubMed: 15899893
DOI: 10.1074/JBC.M414476200

Experimental method

X-RAY DIFFRACTION (2 Å)