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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9UK17: Variant p.Val338Glu

A-type voltage-gated potassium channel KCND3
Gene: KCND3
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Variant information Variant position: help 338 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 Valine (V) to Glutamate (E) at position 338 (V338E, p.Val338Glu). 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 medium size and hydrophobic (V) to medium size and acidic (E) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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 SCA19. Any additional useful information about the variant.


Sequence information Variant position: help 338 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 655 The length of the canonical sequence.
Location on the sequence: help ASELGFLLFSLTMAIIIFAT V MFYAEKGSSASKFTSIPASF 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                         ASELGFLLFSLTMAIIIFATVMFYAEKGSSASKFTSIPASF

Mouse                         ASELGFLLFSLTMAIIIFATVMFYAEKGSSASKFTSIPASF

Rat                           ASELGFLLFSLTMAIIIFATVMFYAEKGSSASKFTSIPASF

Rabbit                        ASELGFLLFSLTMAIIIFATVMFYAEKGSSASKFTSIPASF
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 – 655 A-type voltage-gated potassium channel KCND3
Transmembrane 319 – 343 Helical; Name=Segment S5



Literature citations
Mutations in KCND3 cause spinocerebellar ataxia type 22.
Lee Y.C.; Durr A.; Majczenko K.; Huang Y.H.; Liu Y.C.; Lien C.C.; Tsai P.C.; Ichikawa Y.; Goto J.; Monin M.L.; Li J.Z.; Chung M.Y.; Mundwiller E.; Shakkottai V.; Liu T.T.; Tesson C.; Lu Y.C.; Brice A.; Tsuji S.; Burmeister M.; Stevanin G.; Soong B.W.;
Ann. Neurol. 72:859-869(2012)
Cited for: VARIANTS SCA19 PHE-227 DEL; GLU-338; VAL-345 AND MET-377; CHARACTERIZATION OF VARIANT PHE-227 DEL; FUNCTION; TRANSPORTER ACTIVITY; SUBCELLULAR LOCATION;
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.