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| | ==NMR structures of the transmembrane domains of the AChR b2 subunit== | | ==NMR structures of the transmembrane domains of the AChR b2 subunit== |
| - | <StructureSection load='2lm2' size='340' side='right' caption='[[2lm2]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | + | <StructureSection load='2lm2' size='340' side='right'caption='[[2lm2]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2lm2]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LM2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2LM2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2lm2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LM2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2LM2 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2lly|2lly]]</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CHRNB2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2lm2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2lm2 OCA], [https://pdbe.org/2lm2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2lm2 RCSB], [https://www.ebi.ac.uk/pdbsum/2lm2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2lm2 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2lm2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2lm2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2lm2 RCSB], [http://www.ebi.ac.uk/pdbsum/2lm2 PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Disease == | | == Disease == |
| - | [[http://www.uniprot.org/uniprot/ACHB2_HUMAN ACHB2_HUMAN]] Defects in CHRNB2 are the cause of nocturnal frontal lobe epilepsy type 3 (ENFL3) [MIM:[http://omim.org/entry/605375 605375]]. ENFL3 is an autosomal dominant epilepsy characterized by nocturnal seizures with hyperkinetic automatisms and poorly organized stereotyped movements.<ref>PMID:11062464</ref> <ref>PMID:11104662</ref> | + | [https://www.uniprot.org/uniprot/ACHB2_HUMAN ACHB2_HUMAN] Defects in CHRNB2 are the cause of nocturnal frontal lobe epilepsy type 3 (ENFL3) [MIM:[https://omim.org/entry/605375 605375]. ENFL3 is an autosomal dominant epilepsy characterized by nocturnal seizures with hyperkinetic automatisms and poorly organized stereotyped movements.<ref>PMID:11062464</ref> <ref>PMID:11104662</ref> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/ACHB2_HUMAN ACHB2_HUMAN]] After binding acetylcholine, the AChR responds by an extensive change in conformation that affects all subunits and leads to opening of an ion-conducting channel across the plasma membrane permeable to sodiun ions.<ref>PMID:22361591</ref> | + | [https://www.uniprot.org/uniprot/ACHB2_HUMAN ACHB2_HUMAN] After binding acetylcholine, the AChR responds by an extensive change in conformation that affects all subunits and leads to opening of an ion-conducting channel across the plasma membrane permeable to sodiun ions.<ref>PMID:22361591</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 2lm2" style="background-color:#fffaf0;"></div> |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Homo sapiens]] | | [[Category: Homo sapiens]] |
| - | [[Category: Bondarenko, V]] | + | [[Category: Large Structures]] |
| - | [[Category: Cui, T]] | + | [[Category: Bondarenko V]] |
| - | [[Category: Liu, L T]] | + | [[Category: Cui T]] |
| - | [[Category: Mowrey, D]] | + | [[Category: Liu LT]] |
| - | [[Category: Tang, P]] | + | [[Category: Mowrey D]] |
| - | [[Category: Tillman, T]] | + | [[Category: Tang P]] |
| - | [[Category: Xu, Y]] | + | [[Category: Tillman T]] |
| - | [[Category: Acetylcholine receptor]]
| + | [[Category: Xu Y]] |
| - | [[Category: Transmembrane domain]]
| + | |
| - | [[Category: Transport protein]]
| + | |
| Structural highlights
Disease
ACHB2_HUMAN Defects in CHRNB2 are the cause of nocturnal frontal lobe epilepsy type 3 (ENFL3) [MIM:605375. ENFL3 is an autosomal dominant epilepsy characterized by nocturnal seizures with hyperkinetic automatisms and poorly organized stereotyped movements.[1] [2]
Function
ACHB2_HUMAN After binding acetylcholine, the AChR responds by an extensive change in conformation that affects all subunits and leads to opening of an ion-conducting channel across the plasma membrane permeable to sodiun ions.[3]
Publication Abstract from PubMed
The alpha4beta2 nicotinic acetylcholine receptor (nAChR) is the predominant heteromeric subtype of nAChRs in the brain, which has been implicated in numerous neurological conditions. The structural information specifically for the alpha4beta2 and other neuronal nAChRs is presently limited. In this study, we determined structures of the transmembrane (TM) domains of the alpha4 and beta2 subunits in lauryldimethylamine-oxide (LDAO) micelles using solution NMR spectroscopy. NMR experiments and size exclusion chromatography-multi-angle light scattering (SEC-MALS) analysis demonstrated that the TM domains of alpha4 and beta2 interacted with each other and spontaneously formed pentameric assemblies in the LDAO micelles. The Na(+) flux assay revealed that alpha4beta2 formed Na(+) permeable channels in lipid vesicles. Efflux of Na(+) through the alpha4beta2 channels reduced intra-vesicle Sodium Green fluorescence in a time-dependent manner that was not observed in vesicles without incorporating alpha4beta2. The study provides structural insight into the TM domains of the alpha4beta2 nAChR. It offers a valuable structural framework for rationalizing extensive biochemical data collected previously on the alpha4beta2 nAChR and for designing new therapeutic modulators.
NMR structures of the transmembrane domains of the alpha4beta2 nAChR.,Bondarenko V, Mowrey D, Tillman T, Cui T, Liu LT, Xu Y, Tang P Biochim Biophys Acta. 2012 Feb 14;1818(5):1261-1268. PMID:22361591[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ De Fusco M, Becchetti A, Patrignani A, Annesi G, Gambardella A, Quattrone A, Ballabio A, Wanke E, Casari G. The nicotinic receptor beta 2 subunit is mutant in nocturnal frontal lobe epilepsy. Nat Genet. 2000 Nov;26(3):275-6. PMID:11062464 doi:10.1038/81566
- ↑ Phillips HA, Favre I, Kirkpatrick M, Zuberi SM, Goudie D, Heron SE, Scheffer IE, Sutherland GR, Berkovic SF, Bertrand D, Mulley JC. CHRNB2 is the second acetylcholine receptor subunit associated with autosomal dominant nocturnal frontal lobe epilepsy. Am J Hum Genet. 2001 Jan;68(1):225-31. Epub 2000 Dec 5. PMID:11104662 doi:10.1086/316946
- ↑ Bondarenko V, Mowrey D, Tillman T, Cui T, Liu LT, Xu Y, Tang P. NMR structures of the transmembrane domains of the alpha4beta2 nAChR. Biochim Biophys Acta. 2012 Feb 14;1818(5):1261-1268. PMID:22361591 doi:10.1016/j.bbamem.2012.02.008
- ↑ Bondarenko V, Mowrey D, Tillman T, Cui T, Liu LT, Xu Y, Tang P. NMR structures of the transmembrane domains of the alpha4beta2 nAChR. Biochim Biophys Acta. 2012 Feb 14;1818(5):1261-1268. PMID:22361591 doi:10.1016/j.bbamem.2012.02.008
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