Reviewed,
UniProtKB/Swiss-Prot O95180 (CAC1H_HUMAN)
Last modified
June 16, 2009.
Version 87.
History...
Clusters with 100%,
90%,
50% identity |
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Names and origin
| Protein names | Recommended name: Voltage-dependent T-type calcium channel subunit alpha-1H Alternative name(s): Voltage-gated calcium channel subunit alpha Cav3.2 Low-voltage-activated calcium channel alpha1 3.2 subunit | ||
| Gene names |
| ||
| Organism | Homo sapiens (Human) | ||
| Taxonomic identifier | 9606 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo |
Protein attributes
| Sequence length | 2353 AA. |
| Sequence status | Complete. |
| Sequence processing | The displayed sequence is not processed. |
| Protein existence | Evidence at protein level. |
General annotation (Comments)
| Function | 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-1H gives rise to T-type calcium currents. T-type calcium channels belong to the "low-voltage activated (LVA)" group and are strongly blocked by nickel and mibefradil. A particularity of this type of channels is an opening at quite negative potentials, and a voltage-dependent inactivation. T-type channels serve pacemaking functions in both central neurons and cardiac nodal cells and support calcium signaling in secretory cells and vascular smooth muscle. They may also be involved in the modulation of firing patterns of neurons which is important for information processing as well as in cell growth processes. |
| Subcellular location | |
| Tissue specificity | Expressed in kidney, liver, heart, brain. Isoform 2 seems to be testis-specific. |
| Domain | Each of the four internal repeats contains five hydrophobic transmembrane segments (S1, S2, S3, S5, S6) and one positively charged transmembrane segment (S4). S4 segments probably represent the voltage-sensor and are characterized by a series of positively charged amino acids at every third position. |
| Post-translational modification | In response to raising of intracellular calcium, the T-type channels are activated by CaM-kinase II. |
| Involvement in disease | Defects in CACNA1H are a cause of susceptibility to idiopathic generalized epilepsy type 6 (IGE6) [MIM:611942]. IGE is characterized by recurring generalized seizures in the absence of detectable brain lesions and/or metabolic abnormalities. Generalized seizures arise diffusely and simultaneously from both hemispheres of the brain. IGE6 is a polygenic and multifactorial disease. Ref.10 |
| Sequence similarities | Belongs to the calcium channel alpha-1 subunit (TC 1.A.1.11) family. [View classification] |
| Sequence caution | The sequence AAK61268.1 differs from that shown. Reason: Erroneous gene model prediction. The sequence CAC42094.1 differs from that shown. Reason: Erroneous gene model prediction. |
Ontologies
| Keywords | |
|---|---|
| Biological process | Calcium transport Ion transport Transport |
| Cellular component | Membrane |
| Coding sequence diversity | Alternative splicing Polymorphism |
| Disease | Disease mutation Epilepsy |
| Domain | Repeat Transmembrane |
| Ligand | Calcium |
| Molecular function | Calcium channel Ionic channel Voltage-gated channel |
| PTM | Glycoprotein Phosphoprotein |
| Gene Ontology (GO) | |
| Biological process | calcium ion transport Inferred from electronic annotation. Source: UniProtKB-KW muscle contraction Ref.1Traceable author statement. Source: ProtInc myoblast fusionTraceable author statement. Source: ProtInc regulation of heart contraction Ref.1Traceable author statement. Source: ProtInc |
| Cellular component | voltage-gated calcium channel complex Traceable author statement. Source: ProtInc |
| Molecular function | calcium ion binding Inferred from electronic annotation. Source: UniProtKB-KW low voltage-gated calcium channel activityTraceable author statement. Source: ProtInc |
| Complete GO annotation... | |
Alternative products
| This entry describes 2 isoforms produced by alternative splicing. [Align] [Select] | ||||||
| Isoform 1 (identifier: O95180-1) Also known as: A1H-a; This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform 2 (identifier: O95180-2) Also known as: A1H-b; The sequence of this isoform differs from the canonical sequence as follows: 1587-1592: Missing. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 2353 | 2353 | Voltage-dependent T-type calcium channel subunit alpha-1H | PRO_0000053954 | |||||
Regions | |||||||||
| Topological domain | 1 – 100 | 100 | Cytoplasmic Potential | ||||||
| Transmembrane | 101 – 119 | 19 | S1 of repeat I Potential | ||||||
| Topological domain | 120 – 139 | 20 | Extracellular Potential | ||||||
| Transmembrane | 140 – 160 | 21 | S2 of repeat I Potential | ||||||
| Topological domain | 161 – 169 | 9 | Cytoplasmic Potential | ||||||
| Transmembrane | 170 – 184 | 15 | S3 of repeat I Potential | ||||||
| Topological domain | 185 – 193 | 9 | Extracellular Potential | ||||||
| Transmembrane | 194 – 212 | 19 | S4 of repeat I Potential | ||||||
| Topological domain | 213 – 232 | 20 | Cytoplasmic Potential | ||||||
| Transmembrane | 233 – 253 | 21 | S5 of repeat I Potential | ||||||
| Topological domain | 254 – 394 | 141 | Extracellular Potential | ||||||
| Transmembrane | 395 – 419 | 25 | S6 of repeat I Potential | ||||||
| Topological domain | 420 – 793 | 374 | Cytoplasmic Potential | ||||||
| Transmembrane | 794 – 814 | 21 | S1 of repeat II Potential | ||||||
| Topological domain | 815 – 827 | 13 | Extracellular Potential | ||||||
| Transmembrane | 828 – 849 | 22 | S2 of repeat II Potential | ||||||
| Topological domain | 850 – 855 | 6 | Cytoplasmic Potential | ||||||
| Transmembrane | 856 – 874 | 19 | S3 of repeat II Potential | ||||||
| Topological domain | 875 – 882 | 8 | Extracellular Potential | ||||||
| Transmembrane | 883 – 906 | 24 | S4 of repeat II Potential | ||||||
| Topological domain | 907 – 917 | 11 | Cytoplasmic Potential | ||||||
| Transmembrane | 918 – 938 | 21 | S5 of repeat II Potential | ||||||
| Topological domain | 939 – 990 | 52 | Extracellular Potential | ||||||
| Transmembrane | 991 – 1015 | 25 | S6 of repeat II Potential | ||||||
| Topological domain | 1016 – 1290 | 275 | Cytoplasmic Potential | ||||||
| Transmembrane | 1291 – 1313 | 23 | S1 of repeat III Potential | ||||||
| Topological domain | 1314 – 1331 | 18 | Extracellular Potential | ||||||
| Transmembrane | 1332 – 1352 | 21 | S2 of repeat III Potential | ||||||
| Topological domain | 1353 – 1362 | 10 | Cytoplasmic Potential | ||||||
| Transmembrane | 1363 – 1382 | 20 | S3 of repeat III Potential | ||||||
| Topological domain | 1383 – 1396 | 14 | Extracellular Potential | ||||||
| Transmembrane | 1397 – 1418 | 22 | S4 of repeat III Potential | ||||||
| Topological domain | 1419 – 1428 | 10 | Cytoplasmic Potential | ||||||
| Transmembrane | 1429 – 1452 | 24 | S5 of repeat III Potential | ||||||
| Topological domain | 1453 – 1529 | 77 | Extracellular Potential | ||||||
| Transmembrane | 1530 – 1555 | 26 | S6 of repeat III Potential | ||||||
| Topological domain | 1556 – 1616 | 61 | Cytoplasmic Potential | ||||||
| Transmembrane | 1617 – 1637 | 21 | S1 of repeat IV Potential | ||||||
| Topological domain | 1638 – 1651 | 14 | Extracellular Potential | ||||||
| Transmembrane | 1652 – 1673 | 22 | S2 of repeat IV Potential | ||||||
| Topological domain | 1674 – 1680 | 7 | Cytoplasmic Potential | ||||||
| Transmembrane | 1681 – 1699 | 19 | S3 of repeat IV Potential | ||||||
| Topological domain | 1700 – 1713 | 14 | Extracellular Potential | ||||||
| Transmembrane | 1714 – 1737 | 24 | S4 of repeat IV Potential | ||||||
| Topological domain | 1738 – 1751 | 14 | Cytoplasmic Potential | ||||||
| Transmembrane | 1752 – 1772 | 21 | S5 of repeat IV Potential | ||||||
| Topological domain | 1773 – 1835 | 63 | Extracellular Potential | ||||||
| Transmembrane | 1836 – 1863 | 28 | S6 of repeat IV Potential | ||||||
| Topological domain | 1864 – 2353 | 490 | Cytoplasmic Potential | ||||||
| Repeat | 87 – 422 | 336 | I | ||||||
| Repeat | 779 – 1018 | 240 | II | ||||||
| Repeat | 1281 – 1558 | 278 | III | ||||||
| Repeat | 1602 – 1863 | 262 | IV | ||||||
| Compositional bias | 520 – 530 | 11 | Poly-His | ||||||
| Compositional bias | 1107 – 1110 | 4 | Poly-Ser | ||||||
| Compositional bias | 1583 – 1586 | 4 | Poly-Arg | ||||||
Sites | |||||||||
| Site | 378 | 1 | Calcium ion selectivity and permeability By similarity | ||||||
| Site | 974 | 1 | Calcium ion selectivity and permeability By similarity | ||||||
| Site | 1504 | 1 | Calcium ion selectivity and permeability By similarity | ||||||
| Site | 1808 | 1 | Calcium ion selectivity and permeability By similarity | ||||||
Amino acid modifications | |||||||||
| Modified residue | 783 | 1 | Phosphoserine Ref.9 | ||||||
| Modified residue | 1191 | 1 | Phosphothreonine Ref.8 | ||||||
| Glycosylation | 192 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 271 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 1466 | 1 | N-linked (GlcNAc...) Potential | ||||||
Natural variations | |||||||||
| Alternative sequence | 1587 – 1592 | 6 | Missing in isoform 2. | VSP_000949 | |||||
| Natural variant | 161 | 1 | F → L in IGE6. Ref.10 | VAR_045935 | |||||
| Natural variant | 282 | 1 | E → K in IGE6. Ref.10 | VAR_045936 | |||||
| Natural variant | 313 | 1 | M → V: dbSNP rs36117280. Ref.10 Ref.5 Ref.6 | VAR_045937 | |||||
| Natural variant | 456 | 1 | C → S in IGE6. Ref.10 | VAR_045938 | |||||
| Natural variant | 499 | 1 | G → S in IGE6. Ref.10 | VAR_045939 | |||||
| Natural variant | 640 | 1 | P → L Ref.10 Ref.7 | VAR_045940 | |||||
| Natural variant | 648 | 1 | P → L in IGE6. Ref.10 | VAR_045941 | |||||
| Natural variant | 664 | 1 | V → A: dbSNP rs4984636. Ref.10 Ref.1 Ref.4 | VAR_045942 | |||||
| Natural variant | 684 | 1 | P → S Ref.10 | VAR_045943 | |||||
| Natural variant | 744 | 1 | R → Q in IGE6. Ref.10 | VAR_045944 | |||||
| Natural variant | 748 | 1 | A → V in IGE6. Ref.10 | VAR_045945 | |||||
| Natural variant | 773 | 1 | G → D in IGE6. Ref.10 | VAR_045946 | |||||
| Natural variant | 784 | 1 | G → S in IGE6. Ref.10 | VAR_045947 | |||||
| Natural variant | 788 | 1 | R → C: dbSNP rs3751664. Ref.10 | VAR_045948 | |||||
| Natural variant | 812 | 1 | V → M: dbSNP rs28365119. | VAR_045949 | |||||
| Natural variant | 831 | 1 | V → M in IGE6. Ref.10 | VAR_045950 | |||||
| Natural variant | 848 | 1 | G → S in IGE6. Ref.10 | VAR_045951 | |||||
| Natural variant | 1463 | 1 | D → N in IGE6. Ref.10 | VAR_045952 | |||||
| Natural variant | 1974 | 1 | E → G: dbSNP rs3751886. | VAR_033698 | |||||
| Natural variant | 2032 | 1 | R → H: dbSNP rs1054644. | VAR_048744 | |||||
| Natural variant | 2060 | 1 | R → H: dbSNP rs1054644. Ref.10 Ref.5 | VAR_045953 | |||||
| Natural variant | 2077 | 1 | R → H: dbSNP rs1054645. Ref.10 Ref.7 Ref.3 | VAR_045954 | |||||
| Natural variant | 2173 | 1 | P → S Ref.10 | VAR_045955 | |||||
Experimental info | |||||||||
| Sequence conflict | 7 | 1 | A → S in AC120498. Ref.5 | ||||||
| Sequence conflict | 31 | 1 | E → K in AC120498. Ref.5 | ||||||
| Sequence conflict | 55 | 1 | A → S in AC120498. Ref.5 | ||||||
| Sequence conflict | 94 | 1 | L → V in AC120498. Ref.5 | ||||||
| Sequence conflict | 215 | 1 | S → T in CAC42094. Ref.6 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Cloning and characterization of alpha1H from human heart, a member of the T-type Ca2+ channel gene family." Cribbs L.L., Lee J.-H., Yang J., Satin J., Zhang Y., Daud A.N., Barclay J., Wiliamson M.P., Fox M., Rees M., Perez-Reyes E. Circ. Res. 83:103-109(1998) [PubMed: 9670923] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), VARIANT ALA-664. Tissue: Heart. |
| [2] | Cribbs L.L., Lee J.-H., Yang J., Daud A.N., Perez-Reyes E. Submitted (JUL-2001) to the EMBL/GenBank/DDBJ databases Cited for: SEQUENCE REVISION. |
| [3] | "Structure and functional characterization of a novel human low-voltage activated calcium channel." Williams M.E., Washburn M.S., Hans M., Urrutia A., Brust P.F., Prodanovich P., Harpold M.M., Stauderman K.A. J. Neurochem. 72:791-799(1999) [PubMed: 9930755] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), VARIANT HIS-2077. Tissue: Thyroid carcinoma. |
| [4] | "Identification and localization of T-type voltage-operated calcium channel subunits in human male germ cells. Expression of multiple isoforms." Jagannathan S., Punt E.L., Gu Y., Arnoult C., Sakkas D., Barratt C.L., Publicover S.J. J. Biol. Chem. 277:8449-8456(2002) [PubMed: 11751928] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 2), VARIANT ALA-664. Tissue: Testis. |
| [5] | "Sequence, structure and pathology of the fully annotated terminal 2 Mb of the short arm of human chromosome 16." Daniels R.J., Peden J.F., Lloyd C., Horsley S.W., Clark K., Tufarelli C., Kearney L., Buckle V.J., Doggett N.A., Flint J., Higgs D.R. Hum. Mol. Genet. 10:339-352(2001) [PubMed: 11157797] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA], VARIANTS VAL-313 AND HIS-2060. |
| [6] | "The sequence and analysis of duplication-rich human chromosome 16." Martin J., Han C., Gordon L.A., Terry A., Prabhakar S., She X., Xie G., Hellsten U., Chan Y.M., Altherr M., Couronne O., Aerts A., Bajorek E., Black S., Blumer H., Branscomb E., Brown N.C., Bruno W.J. Pennacchio L.A.Nature 432:988-994(2004) [PubMed: 15616553] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA], VARIANT VAL-313. |
| [7] | "Organization and alternative splicing of CACNA1H." Mittman S., Agnew W.S. Submitted (JAN-2001) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE OF 424-661 AND 838-2373 (ISOFORM 1), VARIANTS LEU-640 AND HIS-2077. |
| [8] | "Global, in vivo, and site-specific phosphorylation dynamics in signaling networks." Olsen J.V., Blagoev B., Gnad F., Macek B., Kumar C., Mortensen P., Mann M. Cell 127:635-648(2006) [PubMed: 17081983] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT THR-1191, MASS SPECTROMETRY. Tissue: Epithelium. |
| [9] | "Automated phosphoproteome analysis for cultured cancer cells by two-dimensional nanoLC-MS using a calcined titania/C18 biphasic column." Imami K., Sugiyama N., Kyono Y., Tomita M., Ishihama Y. Anal. Sci. 24:161-166(2008) [PubMed: 18187866] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-783, MASS SPECTROMETRY. |
| [10] | "Association between genetic variation of CACNA1H and childhood absence epilepsy." Chen Y., Lu J., Pan H., Zhang Y., Wu H., Xu K., Liu X., Jiang Y., Bao X., Yao Z., Ding K., Lo W.H., Qiang B., Chan P., Shen Y., Wu X. Ann. Neurol. 54:239-243(2003) [PubMed: 12891677] [Abstract] Cited for: VARIANTS IGE6 LEU-161; LYS-282; SER-456; SER-499; LEU-648; GLN-744; VAL-748; ASP-773; SER-784; MET-831; SER-848 AND ASN-1463, VARIANTS VAL-313; LEU-640; ALA-664; SER-684; CYS-788; HIS-2060; HIS-2077 AND SER-2173. |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |
|---|---|
| AF051946 mRNA. Translation: AAC67239.3. AF073931 mRNA. Translation: AAD17668.1. AJ420779 mRNA. Translation: CAD12646.1. AE006466 Genomic DNA. Translation: AAK61268.1. Sequence problems. AL031703 Genomic DNA. Translation: CAC42094.1. Sequence problems. AC120498 Genomic DNA. No translation available. AF223562 Genomic DNA. Translation: AAF60162.1. AF223563 Genomic DNA. Translation: AAF60163.1. | |
| IPI | IPI00028915. IPI00288892. |
| RefSeq | NP_001005407.1. NP_066921.2. |
| UniGene | Hs.459642 |
3D structure databases | |
| ModBase | Search... |
Protein family/group databases | |
| TCDB | 1.A.1.11.5. voltage-gated ion channel (VIC) superfamily. |
PTM databases | |
| PhosphoSite | O95180. |
Proteomic databases | |
| PRIDE | O95180. |
Genome annotation databases | |
| Ensembl | ENSG00000196557. Homo sapiens. [Contig view] |
| GeneID | 8912. |
| KEGG | hsa:8912. |
Organism-specific databases | |
| GeneCards | GC16P001147. |
| H-InvDB | HIX0038538. |
| HGNC | HGNC:1395. CACNA1H. |
| MIM | 607904. gene. 611942. phenotype. |
| PharmGKB | PA380. |
| GenAtlas | Search... |
Phylogenomic databases | |
| HOVERGEN | O95180. |
| OMA | O95180. FFLRIDS. |
Gene expression databases | |
| Bgee | O95180. |
| CleanEx | HS_CACNA1H. |
| GermOnline | ENSG00000196557. Homo sapiens. |
Family and domain databases | |
| InterPro | IPR005821. Ion_trans. IPR005445. VDCC_T_a1su. [Graphical view] |
| Pfam | PF00520. Ion_trans. 4 hits. [Graphical view] |
| PRINTS | PR01629. TVDCCALPHA1. |
| ProtoNet | Search... |
Other Resources | |
| DrugBank | DB04841. Flunarizine. DB01388. Mibefradil. |
| NextBio | 33494. |
| SOURCE | Search... |
Entry information
| Entry name | CAC1H_HUMAN | ||||||||
| Accession | Primary (citable) accession number: O95180 Secondary accession number(s): O95802 Q9NYY5 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation project | HPI (Human Proteome Initiative) | ||||||||
Relevant documents
| Human chromosome 16 Human chromosome 16: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| SIMILARITY comments Index of protein domains and families |

Clusters with


