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UniProtKB/Swiss-Prot O00555: Variant p.Thr665Met

Voltage-dependent P/Q-type calcium channel subunit alpha-1A
Gene: CACNA1A
Variant information

Variant position:  665
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Threonine (T) to Methionine (M) at position 665 (T665M, p.Thr665Met).
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:  Change from medium size and polar (T) to medium size and hydrophobic (M)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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:  In FHM1 and EA2.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  665
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2506
The length of the canonical sequence.

Location on the sequence:   TPPTNFDTFPAAIMTVFQIL  T GEDWNEVMYDGIKSQGGVQG
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:  
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
Topological domain 636 – 688 Extracellular
Repeat 472 – 716 II
Site 667 – 667 Calcium ion selectivity and permeability


Literature citations

Familial hemiplegic migraine and episodic ataxia type-2 are caused by mutations in the Ca2+ channel gene CACNL1A4.
Ophoff R.A.; Terwindt G.M.; Vergouwe M.N.; van Eijk R.; Oefner P.J.; Hoffman S.M.G.; Lamerdin J.E.; Mohrenweiser H.W.; Bulman D.E.; Ferrari M.; Haan J.; Lindhout D.; van Ommen G.-J.B.; Hofker M.H.; Ferrari M.D.; Frants R.R.;
Cell 87:543-552(1996)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA / MRNA] (ISOFORM 3); VARIANTS FHM1 GLN-192; MET-665; ALA-713 AND LEU-1809; VARIANT THR-453; INVOLVEMENT IN EA2;

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;

Clinical spectrum of episodic ataxia type 2.
Jen J.; Kim G.W.; Baloh R.W.;
Neurology 62:17-22(2004)
Cited for: VARIANTS EA2 TYR-287; ARG-293 AND MET-665;

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.