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| | <StructureSection load='1vyt' size='340' side='right'caption='[[1vyt]], [[Resolution|resolution]] 2.60Å' scene=''> | | <StructureSection load='1vyt' size='340' side='right'caption='[[1vyt]], [[Resolution|resolution]] 2.60Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1vyt]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Buffalo_rat Buffalo rat]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VYT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VYT FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1vyt]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VYT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VYT FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1vyu|1vyu]], [[1vyv|1vyv]]</div></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6Å</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=1vyt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vyt OCA], [https://pdbe.org/1vyt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vyt RCSB], [https://www.ebi.ac.uk/pdbsum/1vyt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vyt ProSAT]</span></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=1vyt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vyt OCA], [https://pdbe.org/1vyt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vyt RCSB], [https://www.ebi.ac.uk/pdbsum/1vyt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vyt ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/CACB3_RAT CACB3_RAT]] The beta subunit of voltage-dependent calcium channels contributes to the function of the calcium channel by increasing peak calcium current, shifting the voltage dependencies of activation and inactivation, modulating G protein inhibition and controlling the alpha-1 subunit membrane targeting. [[https://www.uniprot.org/uniprot/CAC1C_RAT CAC1C_RAT]] Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1C gives rise to L-type calcium currents. Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group. They are blocked by dihydropyridines (DHP), phenylalkylamines, benzothiazepines, and by omega-agatoxin-IIIA (omega-Aga-IIIA). They are however insensitive to omega-conotoxin-GVIA (omega-CTx-GVIA) and omega-agatoxin-IVA (omega-Aga-IVA). Calcium channels containing the alpha-1C subunit play an important role in excitation-contraction coupling in the heart. Binding of calmodulin or CABP1 at the same regulatory sites results in an opposit effects on the channel function.
| + | [https://www.uniprot.org/uniprot/CACB3_RAT CACB3_RAT] The beta subunit of voltage-dependent calcium channels contributes to the function of the calcium channel by increasing peak calcium current, shifting the voltage dependencies of activation and inactivation, modulating G protein inhibition and controlling the alpha-1 subunit membrane targeting. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Buffalo rat]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Chen, Y H]] | + | [[Category: Rattus norvegicus]] |
| - | [[Category: Fitzmaurice, A]] | + | [[Category: Chen Y-H]] |
| - | [[Category: He, L L]] | + | [[Category: Fitzmaurice A]] |
| - | [[Category: Li, M H]] | + | [[Category: He L-L]] |
| - | [[Category: Tong, L]] | + | [[Category: Li M-H]] |
| - | [[Category: Yamada, Y]] | + | [[Category: Tong L]] |
| - | [[Category: Yang, J]] | + | [[Category: Yamada Y]] |
| - | [[Category: Yang, S]] | + | [[Category: Yang J]] |
| - | [[Category: Zhang, H]] | + | [[Category: Yang S]] |
| - | [[Category: Zhang, Y]] | + | [[Category: Zhang H]] |
| - | [[Category: Aid doamin]]
| + | [[Category: Zhang Y]] |
| - | [[Category: Calcium channel beta subunit]]
| + | |
| - | [[Category: Ion transport]]
| + | |
| - | [[Category: Ion transport-complex]]
| + | |
| - | [[Category: Ionic channel]]
| + | |
| - | [[Category: Sh3 domain]]
| + | |
| - | [[Category: Transport protein]]
| + | |
| - | [[Category: Voltage-gated channel]]
| + | |
| Structural highlights
Function
CACB3_RAT The beta subunit of voltage-dependent calcium channels contributes to the function of the calcium channel by increasing peak calcium current, shifting the voltage dependencies of activation and inactivation, modulating G protein inhibition and controlling the alpha-1 subunit membrane targeting.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
High-voltage-activated Ca2+ channels are essential for diverse biological processes. They are composed of four or five subunits, including alpha1, alpha2-delta, beta and gamma (ref. 1). Their expression and function are critically dependent on the beta-subunit, which transports alpha1 to the surface membrane and regulates diverse channel properties. It is believed that the beta-subunit interacts with alpha1 primarily through the beta-interaction domain (BID), which binds directly to the alpha-interaction domain (AID) of alpha1; however, the molecular mechanism of the alpha1-beta interaction is largely unclear. Here we report the crystal structures of the conserved core region of beta3, alone and in complex with AID, and of beta4 alone. The structures show that the beta-subunit core contains two interacting domains: a Src homology 3 (SH3) domain and a guanylate kinase (GK) domain. The AID binds to a hydrophobic groove in the GK domain through extensive interactions, conferring extremely high affinity between alpha1 and beta-subunits. The BID is essential both for the structural integrity of and for bridging the SH3 and GK domains, but it does not participate directly in binding alpha1. The presence of multiple protein-interacting modules in the beta-subunit opens a new dimension to its function as a multi-functional protein.
Structural basis of the alpha1-beta subunit interaction of voltage-gated Ca2+ channels.,Chen YH, Li MH, Zhang Y, He LL, Yamada Y, Fitzmaurice A, Shen Y, Zhang H, Tong L, Yang J Nature. 2004 Jun 10;429(6992):675-80. Epub 2004 May 30. PMID:15170217[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Chen YH, Li MH, Zhang Y, He LL, Yamada Y, Fitzmaurice A, Shen Y, Zhang H, Tong L, Yang J. Structural basis of the alpha1-beta subunit interaction of voltage-gated Ca2+ channels. Nature. 2004 Jun 10;429(6992):675-80. Epub 2004 May 30. PMID:15170217 doi:10.1038/nature02641
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