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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q13936: Variant p.Ile1523Met

Voltage-dependent L-type calcium channel subunit alpha-1C
Gene: CACNA1C
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Variant information Variant position: help 1523 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change: help From Isoleucine (I) to Methionine (M) at position 1523 (I1523M, p.Ile1523Met). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: help Similar physico-chemical property. Both residues are medium size and hydrophobic. The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 1 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Variant description: help In LQT8; gain of function activity. Any additional useful information about the variant.


Sequence information Variant position: help 1523 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2221 The length of the canonical sequence.
Location on the sequence: help YFISFYMLCAFLIINLFVAV I MDNFDYLTRDWSILGPHHLD The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Residue conservation: help The multiple alignment of the region surrounding the variant against various orthologous sequences.
Human                         YFISFYMLCAFLIINLFVAVIMDNFDYLTRDWSILGPHHLD

Mouse                         YFISFYMLCAFLIINLFVAVIMDNFDYLTRDWSILGPHHLD

Rat                           YFISFYMLCAFLIINLFVAVIMDNFDYLTRDWSILGPHHLD

Rabbit                        YFISFYMLCAFLIINLFVAVIMDNFDYLTRDWSILGPHHLD

Sequence annotation in neighborhood: help The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.
TypePositionsDescription
Chain 1 – 2221 Voltage-dependent L-type calcium channel subunit alpha-1C
Transmembrane 1500 – 1524 Helical; Name=S6 of repeat IV
Repeat 1226 – 1527 IV
Region 1478 – 1546 Dihydropyridine binding
Region 1492 – 1534 Phenylalkylamine binding
Helix 1500 – 1530



Literature citations
Gain-of-function mutations in the calcium channel CACNA1C (Cav1.2) cause non-syndromic long-QT but not Timothy syndrome.
Wemhoener K.; Friedrich C.; Stallmeyer B.; Coffey A.J.; Grace A.; Zumhagen S.; Seebohm G.; Ortiz-Bonnin B.; Rinne S.; Sachse F.B.; Schulze-Bahr E.; Decher N.;
J. Mol. Cell. Cardiol. 80:186-195(2015)
Cited for: VARIANTS LQT8 THR-28; LYS-477; GLY-860; THR-1186; VAL-1186; THR-1365; MET-1523; LYS-1544; ASN-1787; ILE-1800; LYS-1948; MET-1953; ASN-2081; ILE-2097 AND GLY-2122; CHARACTERIZATION OF VARIANTS LQT8 THR-28; GLY-860; THR-1186; VAL-1186; MET-1523 AND LYS-1544; VARIANTS ARG-37; THR-304; SER-817; ILE-1755; GLY-1765; MET-1835; ARG-1843; CYS-1972; GLN-2056 AND SER-2174;
Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.