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1vyt

From Proteopedia

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Revision as of 10:27, 8 January 2020

beta3 subunit complexed with aid

Structural highlights

1vyt is a 4 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1vyu, 1vyv
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

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. [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.

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.

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

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1vyt"

@@ Line 1: / Line 1: @@
 ==beta3 subunit complexed with aid==
-<StructureSection load='1vyt' size='340' side='right' caption='[[1vyt]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
+<StructureSection load='1vyt' size='340' side='right'caption='[[1vyt]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1vyt]] is a 4 chain structure with sequence from [http://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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1VYT FirstGlance]. <br>
@@ Line 30: / Line 30: @@
 ==See Also==
-*[[Ion channels|Ion channels]]
+*[[Ion channels 3D structures|Ion channels 3D structures]]
 == References ==
 <references/>
@@ Line 36: / Line 36: @@
 </StructureSection>
 [[Category: Buffalo rat]]
+[[Category: Large Structures]]
 [[Category: Chen, Y H]]
 [[Category: Fitzmaurice, A]]

1vyt

From Proteopedia

Revision as of 10:27, 8 January 2020

beta3 subunit complexed with aid

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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