UniProtKB/SwissProt variant VAR

Variant information

Variant position:

274

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

Type of variant:

Disease [Disclaimer]

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 Leucine (L) to Histidine (H) at position 274 (L274H, p.Leu274His).

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 hydrophobic (L) to medium size and polar (H)

The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:

-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:

In DFNA2A.

Any additional useful information about the variant.

Other resources:

Links to websites of interest for the variant.

Variant rs80358276 [ dbSNP | Ensembl ]

Sequence information

Variant position:

274

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

Protein sequence length:

695

The length of the canonical sequence.

Location on the sequence:

FLVYLAEKDANSDFSSYADS L WWGTITLTTIGYGDKTPHTW

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                         FLVYLAEKDANSDFSSYADSLWWGTITLTTIGYGDKTPHTW

Mouse                         FLVYLAEKDANSDFSSYADSLWWGTITLTTIGYGDKTPHTW

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.

Type	Positions	Description
Chain	1 – 695	Potassium voltage-gated channel subfamily KQT member 4
Intramembrane	271 – 292	Pore-forming; Name=Segment H5
Mutagenesis	261 – 261	K -> G. No effect on inhibition by potassium channel toxin SsTX.
Mutagenesis	262 – 262	D -> G. No effect on inhibition by potassium channel toxin SsTX.
Mutagenesis	266 – 266	D -> G. Resistant to inhibition by potassium channel toxin SsTX. Normal voltage activation.
Mutagenesis	268 – 268	S -> G. No effect on inhibition by potassium channel toxin SsTX.
Mutagenesis	272 – 272	D -> G. No effect on inhibition by potassium channel toxin SsTX.
Mutagenesis	288 – 288	D -> G. Resistant to inhibition by potassium channel toxin SsTX. Normal voltage activation.
Mutagenesis	290 – 290	T -> V. No effect on inhibition by potassium channel toxin SsTX.
Mutagenesis	292 – 292	H -> G. No effect on inhibition by potassium channel toxin SsTX.

Literature citations

Mutations in the KCNQ4 K+ channel gene, responsible for autosomal dominant hearing loss, cluster in the channel pore region.
Van Hauwe P.; Coucke P.J.; Ensink R.J.; Huygen P.; Cremers C.W.R.J.; Van Camp G.;
Am. J. Med. Genet. 93:184-187(2000)
Cited for: VARIANT DFNA2A HIS-274;

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P56696: Variant p.Leu274His