Expasy logo

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O00555: Variant p.Arg1666Trp

Voltage-dependent P/Q-type calcium channel subunit alpha-1A
Gene: CACNA1A
Feedback?
Variant information Variant position: help 1666 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 Arginine (R) to Tryptophan (W) at position 1666 (R1666W, p.Arg1666Trp). 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 Change from large size and basic (R) to large size and aromatic (W) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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 FHM1. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 1666 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2506 The length of the canonical sequence.
Location on the sequence: help VTEFGNNFINLSFLRLFRAA R LIKLLRQGYTIRILLWTFVQ 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.
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 – 2506 Voltage-dependent P/Q-type calcium channel subunit alpha-1A
Transmembrane 1652 – 1670 Helical; Name=S4 of repeat IV
Repeat 1550 – 1813 IV
Site 1648 – 1648 Binds to omega-Aga-IVA
Alternative sequence 1650 – 1650 G -> GNP. In isoform 2.



Literature citations
The clinical spectrum of familial hemiplegic migraine associated with mutations in a neuronal calcium channel.
Ducros A.; Denier C.; Joutel A.; Cecillon M.; Lescoat C.; Vahedi K.; Darcel F.; Vicaut E.; Bousser M.G.; Tournier-Lasserve E.;
N. Engl. J. Med. 345:17-24(2001)
Cited for: VARIANTS FHM1 LYS-195; GLN-582; MET-665; GLU-714; GLU-1334; CYS-1383; TRP-1666; ARG-1682 AND ILE-1694;
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.