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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q09470: Variant p.Phe249Ile

Potassium voltage-gated channel subfamily A member 1
Gene: KCNA1
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Variant information Variant position: help 249 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 Phenylalanine (F) to Isoleucine (I) at position 249 (F249I, p.Phe249Ile). 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 aromatic (F) to medium size and hydrophobic (I) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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 EA1. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 249 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 495 The length of the canonical sequence.
Location on the sequence: help IIWFSFELVVRFFACPSKTD F FKNIMNFIDIVAIIPYFITL 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                         IIWFSFELVVRFFACPSKTDFFKNIMNFIDIVAIIPYFITL

Mouse                         IIWFSFELVVRFFACPSKTDFFKNIMNFIDIVAIIPYFITL

Rat                           IIWFSFELVVRFFACPSKTDFFKNIMNFIDIVAIIPYFITL
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 – 495 Potassium voltage-gated channel subfamily A member 1
Topological domain 243 – 253 Cytoplasmic
Lipidation 243 – 243 S-palmitoyl cysteine
Mutagenesis 243 – 243 C -> A. Strongly decreases palmitoylation and alters current kinetics.
Mutagenesis 255 – 255 N -> AHT. Slightly increases channel activity, but does not affect expression at the cell membrane.
Mutagenesis 255 – 255 N -> E. Abolishes channel activity, but does not affect expression at the cell membrane.
Mutagenesis 255 – 255 N -> Q. Strongly reduces channel activity, but does not affect expression at the cell membrane.
Mutagenesis 255 – 255 N -> V. No effect on channel activity.



Literature citations
Episodic ataxia/myokymia syndrome is associated with point mutations in the human potassium channel gene, KCNA1.
Browne D.L.; Gancher S.T.; Nutt J.G.; Brunt E.R.P.; Smith E.A.; Kramer P.; Litt M.;
Nat. Genet. 8:136-140(1994)
Cited for: VARIANTS EA1 PHE-174; SER-239; ILE-249 AND ALA-408;
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.