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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P63252: Variant p.Arg218Trp

Inward rectifier potassium channel 2
Gene: KCNJ2
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Variant information Variant position: help 218 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 218 (R218W, p.Arg218Trp). 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 LQT7; loss of function and dominant-negative effect in current. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 218 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 427 The length of the canonical sequence.
Location on the sequence: help NAVIAMRDGKLCLMWRVGNL R KSHLVEAHVRAQLLKSRITS 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                         NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

                              NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Rhesus macaque                NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Mouse                         NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Rat                           NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Pig                           NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Bovine                        NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Rabbit                        NAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS

Chicken                       NAVVAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITS
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 2 – 427 Inward rectifier potassium channel 2
Topological domain 179 – 427 Cytoplasmic



Literature citations
Mutations in Kir2.1 cause the developmental and episodic electrical phenotypes of Andersen's syndrome.
Plaster N.M.; Tawil R.; Tristani-Firouzi M.; Canun S.; Bendahhou S.; Tsunoda A.; Donaldson M.R.; Iannaccone S.T.; Brunt E.; Barohn R.; Clark J.; Deymeer F.; George A.L. Jr.; Fish F.A.; Hahn A.; Nitu A.; Ozdemir C.; Serdaroglu P.; Subramony S.H.; Wolfe G.; Fu Y.-H.; Ptacek L.J.;
Cell 105:511-519(2001)
Cited for: CHARACTERIZATION OF VARIANTS LQT7 VAL-71 AND TRP-218; VARIANTS LQT7 VAL-300; 95-SER--PHE-98 DEL AND 314-SER-TYR-315 DEL;
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.