This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

6cnk

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

Structure of the 3alpha2beta stiochiometry of the human Alpha4Beta2 nicotinic receptor

6cnk, resolution 3.70Å

Structural highlights

6cnk is a 9 chain structure with sequence from Human and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	6cnj
Gene:	CHRNA4, NACRA4 (HUMAN), CHRNB2 (HUMAN)
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[ACHA4_HUMAN] Autosomal dominant nocturnal frontal lobe epilepsy. The disease is caused by mutations affecting the gene represented in this entry. [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

[ACHA4_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 sodium ions.^[3] [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.^[4]

Publication Abstract from PubMed

Fast chemical communication in the nervous system is mediated by neurotransmitter-gated ion channels. The prototypical member of this class of cell surface receptors is the cation-selective nicotinic acetylcholine receptor. As with most ligand-gated ion channels, nicotinic receptors assemble as oligomers of subunits, usually as hetero-oligomers and often with variable stoichiometries (1) . This intrinsic heterogeneity in protein composition provides fine tunability in channel properties, which is essential to brain function, but frustrates structural and biophysical characterization. The alpha4beta2 subtype of the nicotinic acetylcholine receptor is the most abundant isoform in the human brain and is the principal target in nicotine addiction. This pentameric ligand-gated ion channel assembles in two stoichiometries of alpha- and beta-subunits (2alpha:3beta and 3alpha:2beta). Both assemblies are functional and have distinct biophysical properties, and an imbalance in the ratio of assemblies is linked to both nicotine addiction(2,3) and congenital epilepsy(4,5). Here we leverage cryo-electron microscopy to obtain structures of both receptor assemblies from a single sample. Antibody fragments specific to beta2 were used to 'break' symmetry during particle alignment and to obtain high-resolution reconstructions of receptors of both stoichiometries in complex with nicotine. The results reveal principles of subunit assembly and the structural basis of the distinctive biophysical and pharmacological properties of the two different stoichiometries of this receptor.

Structural principles of distinct assemblies of the human alpha4beta2 nicotinic receptor.,Walsh RM Jr, Roh SH, Gharpure A, Morales-Perez CL, Teng J, Hibbs RE Nature. 2018 May 2. pii: 10.1038/s41586-018-0081-7. doi:, 10.1038/s41586-018-0081-7. PMID:29720657^[5]

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
↑ Walsh RM Jr, Roh SH, Gharpure A, Morales-Perez CL, Teng J, Hibbs RE. Structural principles of distinct assemblies of the human alpha4beta2 nicotinic receptor. Nature. 2018 May 2. pii: 10.1038/s41586-018-0081-7. doi:, 10.1038/s41586-018-0081-7. PMID:29720657 doi:http://dx.doi.org/10.1038/s41586-018-0081-7

1 Structural highlights
2 Disease
3 Function
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6cnk"

@@ Line 3: / Line 3: @@
 <SX load='6cnk' size='340' side='right' viewer='molstar' caption='[[6cnk]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6cnk]] is a 9 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CNK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CNK FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6cnk]] is a 9 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CNK OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6CNK FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NCT:(S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE'>NCT</scene>, <scene name='pdbligand=Y01:CHOLESTEROL+HEMISUCCINATE'>Y01</scene></td></tr>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NCT:(S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE'>NCT</scene>, <scene name='pdbligand=Y01:CHOLESTEROL+HEMISUCCINATE'>Y01</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6cnj|6cnj]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CHRNA4, NACRA4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN]), CHRNB2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=6cnk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6cnk OCA], [http://pdbe.org/6cnk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6cnk RCSB], [http://www.ebi.ac.uk/pdbsum/6cnk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6cnk ProSAT]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6cnk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6cnk OCA], [http://pdbe.org/6cnk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6cnk RCSB], [http://www.ebi.ac.uk/pdbsum/6cnk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6cnk ProSAT]</span></td></tr>
 </table>
 == Disease ==

6cnk

From Proteopedia

Current revision

Structure of the 3alpha2beta stiochiometry of the human Alpha4Beta2 nicotinic receptor

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox