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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O60928: Variant p.Arg162Trp

Inward rectifier potassium channel 13
Gene: KCNJ13
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Variant information Variant position: help 162 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 162 (R162W, p.Arg162Trp). 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 SVD; overexpression produces a non-selective cation current that depolarizes transfected cells and increases their fragility. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 162 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 360 The length of the canonical sequence.
Location on the sequence: help MLLGLMLEAFITGAFVAKIA R PKNRAFSIRFTDTAVVAHMD 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                         MLLGLMLEAFITGAFVAKIARPKNRAFSIRFTDTAVVAHMD

Mouse                         MLLGLMLEAFITGAFVAKIARPKNRAFSIRFTDLAVVAHKD

Rat                           MLLGLMLEAFITGAFVAKIARPKNRAFSIRFTDLAVVAHKD
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 – 360 Inward rectifier potassium channel 13
Topological domain 156 – 360 Cytoplasmic
Site 149 – 149 Role in the control of polyamine-mediated channel gating and in the blocking by intracellular magnesium
Alternative sequence 95 – 360 Missing. In isoform 2.



Literature citations
Mutations in KCNJ13 cause autosomal-dominant snowflake vitreoretinal degeneration.
Hejtmancik J.F.; Jiao X.; Li A.; Sergeev Y.V.; Ding X.; Sharma A.K.; Chan C.-C.; Medina I.; Edwards A.O.;
Am. J. Hum. Genet. 82:174-180(2008)
Cited for: VARIANT SVD TRP-162; CHARACTERIZATION OF VARIANT SVD TRP-162;
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.