2WNL
CRYSTAL STRUCTURE OF APLYSIA ACHBP IN COMPLEX WITH ANABASEINE
Summary for 2WNL
Entry DOI | 10.2210/pdb2wnl/pdb |
Related | 2BR7 2BR8 2BYN 2BYP 2BYQ 2BYR 2BYS 2C9T 2UZ6 2W8E 2W8F 2W8G 2WN9 2WNC 2WNJ |
Descriptor | SOLUBLE ACETYLCHOLINE RECEPTOR, 3,4,5,6-tetrahydro-2,3'-bipyridine, 5-amino-1-pyridin-3-ylpentan-1-one, ... (7 entities in total) |
Functional Keywords | receptor, anabaseine, acetylcholine binding protein |
Biological source | APLYSIA CALIFORNICA (CALIFORNIA SEA HARE) |
Total number of polymer chains | 10 |
Total formula weight | 260972.21 |
Authors | Sulzenbacher, G.,Hibbs, R.,Shi, J.,Talley, T.,Conrod, S.,Kem, W.,Taylor, P.,Marchot, P.,Bourne, Y. (deposition date: 2009-07-09, release date: 2009-09-01, Last modification date: 2023-12-13) |
Primary citation | Hibbs, R.E.,Sulzenbacher, G.,Shi, J.,Talley, T.T.,Conrod, S.,Kem, W.R.,Taylor, P.,Marchot, P.,Bourne, Y. Structural determinants for interaction of partial agonists with acetylcholine binding protein and neuronal alpha7 nicotinic acetylcholine receptor. EMBO J., 28:3040-3051, 2009 Cited by PubMed Abstract: The pentameric acetylcholine-binding protein (AChBP) is a soluble surrogate of the ligand binding domain of nicotinic acetylcholine receptors. Agonists bind within a nest of aromatic side chains contributed by loops C and F on opposing faces of each subunit interface. Crystal structures of Aplysia AChBP bound with the agonist anabaseine, two partial agonists selectively activating the alpha7 receptor, 3-(2,4-dimethoxybenzylidene)-anabaseine and its 4-hydroxy metabolite, and an indole-containing partial agonist, tropisetron, were solved at 2.7-1.75 A resolution. All structures identify the Trp 147 carbonyl oxygen as the hydrogen bond acceptor for the agonist-protonated nitrogen. In the partial agonist complexes, the benzylidene and indole substituent positions, dictated by tight interactions with loop F, preclude loop C from adopting the closed conformation seen for full agonists. Fluctuation in loop C position and duality in ligand binding orientations suggest molecular bases for partial agonism at full-length receptors. This study, while pointing to loop F as a major determinant of receptor subtype selectivity, also identifies a new template region for designing alpha7-selective partial agonists to treat cognitive deficits in mental and neurodegenerative disorders. PubMed: 19696737DOI: 10.1038/emboj.2009.227 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (2.7 Å) |
Structure validation
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