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UniProtKB/Swiss-Prot Q9Y6H6: Variant p.Arg99His

Potassium voltage-gated channel subfamily E member 3
Gene: KCNE3
Variant information

Variant position:  99
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Unclassified
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Arginine (R) to Histidine (H) at position 99 (R99H, p.Arg99His).
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 large size and basic (R) to medium size and polar (H)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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 BRGDA6; also in a patient suffering from drug-induced torsades de pointes; unknown pathological significance.
Any additional useful information about the variant.

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

Sequence information

Variant position:  99
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  103
The length of the canonical sequence.

Location on the sequence:   YTRSRKVDKRSDPYHVYIKN  R VSMI
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                         YTRSRKVDKRSDPYHVYIKNRVSMI

Mouse                         YTRSRKVDKRSDPYHVYIKNRVSMI

Rat                           YTRSRKVDKRSDPYHVYIKNRVSMI

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 – 103 Potassium voltage-gated channel subfamily E member 3
Topological domain 79 – 103 Cytoplasmic
Mutagenesis 90 – 90 D -> N. Decreases current 4-fold in KCNH2/KCNE3 channel.

Literature citations

Functional effects of KCNE3 mutation and its role in the development of Brugada syndrome.
Delpon E.; Cordeiro J.M.; Nunez L.; Thomsen P.E.; Guerchicoff A.; Pollevick G.D.; Wu Y.; Kanters J.K.; Larsen C.T.; Hofman-Bang J.; Burashnikov E.; Christiansen M.; Antzelevitch C.;
Circ. Arrhythm. Electrophysiol. 1:209-218(2008)
Cited for: VARIANT BRGDA6 HIS-99;

Novel KCNE3 mutation reduces repolarizing potassium current and associated with long QT syndrome.
Ohno S.; Toyoda F.; Zankov D.P.; Yoshida H.; Makiyama T.; Tsuji K.; Honda T.; Obayashi K.; Ueyama H.; Shimizu W.; Miyamoto Y.; Kamakura S.; Matsuura H.; Kita T.; Horie M.;
Hum. Mutat. 30:557-563(2009)
Cited for: VARIANTS ALA-4; ARG-39 AND HIS-99;

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.