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UniProtKB/Swiss-Prot Q5JUK3: Variant p.Met877Ile

Potassium channel subfamily T member 1
Gene: KCNT1
Variant information

Variant position:  877
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 Methionine (M) to Isoleucine (I) at position 877 (M877I, p.Met877Ile).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  1
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 ENFL5.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  877
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1230
The length of the canonical sequence.

Location on the sequence:   YADNLVVVDKESTMSAEEDY  M ADAKTIVNVQTMFRLFPSLS
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.

Human                         YADNLVVVDKESTMSAEEDYMADAKTIVNVQTMFRLFPSLS

Mouse                         YADNLVVVDKESTMSAEEDYMADAKTIVNVQTMFRLFPSLS

Rat                           YADNLVVVDKESTMSAEEDYMADAKTIVNVQTMFRLFPSLS

Chicken                       YADNLVVVDKESTMSAEEDYMADAKTIVNVQTMFRLFPSLS

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.

TypePositionsDescription
Chain 1 – 1230 Potassium channel subfamily T member 1
Topological domain 326 – 1230 Cytoplasmic


Literature citations

Missense mutations in the sodium-gated potassium channel gene KCNT1 cause severe autosomal dominant nocturnal frontal lobe epilepsy.
Heron S.E.; Smith K.R.; Bahlo M.; Nobili L.; Kahana E.; Licchetta L.; Oliver K.L.; Mazarib A.; Afawi Z.; Korczyn A.; Plazzi G.; Petrou S.; Berkovic S.F.; Scheffer I.E.; Dibbens L.M.;
Nat. Genet. 44:1188-1190(2012)
Cited for: VARIANTS ENFL5 GLN-379; HIS-777; ILE-877 AND CYS-909;

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.