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UniProtKB/Swiss-Prot Q14654: Variant p.His46Tyr

ATP-sensitive inward rectifier potassium channel 11
Gene: KCNJ11
Variant information

Variant position:  46
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 Histidine (H) to Tyrosine (Y) at position 46 (H46Y, p.His46Tyr).
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 (H) to large size and aromatic (Y)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  In PNDM2.
Any additional useful information about the variant.

Sequence information

Variant position:  46
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  390
The length of the canonical sequence.

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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.





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.

Chain 1 – 390 ATP-sensitive inward rectifier potassium channel 11
Topological domain 1 – 68 Cytoplasmic
Alternative sequence 1 – 87 Missing. In isoform 2.
Mutagenesis 64 – 64 V -> M. Displays gain of function; increased open state stability, reduced ATP sensitivity and increased channel activity; almost completely abolishes high affinity sensitivity to glibenclamide, an inhibitor of ATP-sensitive potassium channels.

Literature citations

Mutations in KCNJ11, which encodes Kir6.2, are a common cause of diabetes diagnosed in the first 6 months of life, with the phenotype determined by genotype.
Flanagan S.E.; Edghill E.L.; Gloyn A.L.; Ellard S.; Hattersley A.T.;
Diabetologia 49:1190-1197(2006)
Cited for: VARIANTS PNDM2 TYR-46; GLN-50; ARG-52; ASP-53; GLY-59; MET-59; PRO-164; TYR-166; THR-170; CYS-201; HIS-201; LEU-201; LEU-296 AND SER-330;

Prevalence of permanent neonatal diabetes in Slovakia and successful replacement of insulin with sulfonylurea therapy in KCNJ11 and ABCC8 mutation carriers.
Stanik J.; Gasperikova D.; Paskova M.; Barak L.; Javorkova J.; Jancova E.; Ciljakova M.; Hlava P.; Michalek J.; Flanagan S.E.; Pearson E.; Hattersley A.T.; Ellard S.; Klimes I.;
J. Clin. Endocrinol. Metab. 92:1276-1282(2007)
Cited for: VARIANTS PNDM2 TYR-46; PRO-164 AND HIS-201;

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.