6c0a

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Actinin-1 EF-Hand bound to the Cav1.2 IQ MotifActinin-1 EF-Hand bound to the Cav1.2 IQ Motif

Structural highlights

6c0a is a 2 chain structure with sequence from Lk3 transgenic mice. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:Actn1 (LK3 transgenic mice)
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[CAC1C_HUMAN] Defects in CACNA1C are the cause of Timothy syndrome (TS) [MIM:601005]. TS is a disorder characterized by multiorgan dysfunction including lethal arrhythmias, webbing of fingers and toes, congenital heart disease, immune deficiency, intermittent hypoglycemia, cognitive abnormalities and autism.[1] [2] Defects in CACNA1C are the cause of Brugada syndrome type 3 (BRGDA3) [MIM:611875]. A heart disease characterized by the association of Brugada syndrome with shortened QT intervals. Brugada syndrome is a tachyarrhythmia characterized by right bundle branch block and ST segment elevation on an electrocardiogram (ECG). It can cause the ventricles to beat so fast that the blood is prevented from circulating efficiently in the body. When this situation occurs (called ventricular fibrillation), the individual will faint and may die in a few minutes if the heart is not reset.[3]

Function

[ACTN1_MOUSE] F-actin cross-linking protein which is thought to anchor actin to a variety of intracellular structures. This is a bundling protein (By similarity). [CAC1C_HUMAN] 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. The various isoforms display marked differences in the sensitivity to DHP compounds. Binding of calmodulin or CABP1 at the same regulatory sites results in an opposit effects on the channel function.[4] [5] [6] [7] [8] [9]

Publication Abstract from PubMed

The regulation and localization of the neuronal voltage gated Ca(2+) channel CaV1.2 is important for synaptic plasticity associated with learning and memory. The cytoskeletal protein, alpha-actinin-1 is known to interact with CaV1.2 and stabilize its localization at the postsynaptic membrane. Here we report both backbone and sidechain NMR assignments for the C-terminal EF-hands (EF3 and EF4) of alpha-actinin-1 (residues 824-892, called ACTN_EF34) bound to the IQ-motif (residues 1644-1665) from CaV1.2 (BMRB accession no. 25902).

Chemical shift assignments of the C-terminal EF-hand domain of alpha-actinin-1.,Turner M, Anderson DE, Rajan S, Hell JW, Ames JB Biomol NMR Assign. 2016 Apr;10(1):219-22. doi: 10.1007/s12104-016-9670-2. Epub, 2016 Feb 10. PMID:26861220[10]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

  1. ↑ Splawski I, Timothy KW, Sharpe LM, Decher N, Kumar P, Bloise R, Napolitano C, Schwartz PJ, Joseph RM, Condouris K, Tager-Flusberg H, Priori SG, Sanguinetti MC, Keating MT. Ca(V)1.2 calcium channel dysfunction causes a multisystem disorder including arrhythmia and autism. Cell. 2004 Oct 1;119(1):19-31. PMID:15454078 doi:10.1016/j.cell.2004.09.011
  2. ↑ Splawski I, Timothy KW, Decher N, Kumar P, Sachse FB, Beggs AH, Sanguinetti MC, Keating MT. Severe arrhythmia disorder caused by cardiac L-type calcium channel mutations. Proc Natl Acad Sci U S A. 2005 Jun 7;102(23):8089-96; discussion 8086-8. Epub, 2005 Apr 29. PMID:15863612 doi:10.1073/pnas.0502506102
  3. ↑ Antzelevitch C, Pollevick GD, Cordeiro JM, Casis O, Sanguinetti MC, Aizawa Y, Guerchicoff A, Pfeiffer R, Oliva A, Wollnik B, Gelber P, Bonaros EP Jr, Burashnikov E, Wu Y, Sargent JD, Schickel S, Oberheiden R, Bhatia A, Hsu LF, Haissaguerre M, Schimpf R, Borggrefe M, Wolpert C. Loss-of-function mutations in the cardiac calcium channel underlie a new clinical entity characterized by ST-segment elevation, short QT intervals, and sudden cardiac death. Circulation. 2007 Jan 30;115(4):442-9. Epub 2007 Jan 15. PMID:17224476 doi:10.1161/CIRCULATIONAHA.106.668392
  4. ↑ Schultz D, Mikala G, Yatani A, Engle DB, Iles DE, Segers B, Sinke RJ, Weghuis DO, Klockner U, Wakamori M, et al.. Cloning, chromosomal localization, and functional expression of the alpha 1 subunit of the L-type voltage-dependent calcium channel from normal human heart. Proc Natl Acad Sci U S A. 1993 Jul 1;90(13):6228-32. PMID:8392192
  5. ↑ Soldatov NM, Bouron A, Reuter H. Different voltage-dependent inhibition by dihydropyridines of human Ca2+ channel splice variants. J Biol Chem. 1995 May 5;270(18):10540-3. PMID:7737988
  6. ↑ Soldatov NM, Zuhlke RD, Bouron A, Reuter H. Molecular structures involved in L-type calcium channel inactivation. Role of the carboxyl-terminal region encoded by exons 40-42 in alpha1C subunit in the kinetics and Ca2+ dependence of inactivation. J Biol Chem. 1997 Feb 7;272(6):3560-6. PMID:9013606
  7. ↑ Zuhlke RD, Bouron A, Soldatov NM, Reuter H. Ca2+ channel sensitivity towards the blocker isradipine is affected by alternative splicing of the human alpha1C subunit gene. FEBS Lett. 1998 May 8;427(2):220-4. PMID:9607315
  8. ↑ Lyford GL, Strege PR, Shepard A, Ou Y, Ermilov L, Miller SM, Gibbons SJ, Rae JL, Szurszewski JH, Farrugia G. alpha(1C) (Ca(V)1.2) L-type calcium channel mediates mechanosensitive calcium regulation. Am J Physiol Cell Physiol. 2002 Sep;283(3):C1001-8. PMID:12176756 doi:10.1152/ajpcell.00140.2002
  9. ↑ Tiwari S, Zhang Y, Heller J, Abernethy DR, Soldatov NM. Atherosclerosis-related molecular alteration of the human CaV1.2 calcium channel alpha1C subunit. Proc Natl Acad Sci U S A. 2006 Nov 7;103(45):17024-9. Epub 2006 Oct 27. PMID:17071743 doi:0606539103
  10. ↑ Turner M, Anderson DE, Rajan S, Hell JW, Ames JB. Chemical shift assignments of the C-terminal EF-hand domain of alpha-actinin-1. Biomol NMR Assign. 2016 Apr;10(1):219-22. doi: 10.1007/s12104-016-9670-2. Epub, 2016 Feb 10. PMID:26861220 doi:http://dx.doi.org/10.1007/s12104-016-9670-2
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