UniProtKB/SwissProt variant VAR

Variant information

Variant position:

640

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 Phenylalanine (F) to Leucine (L) at position 640 (F640L, p.Phe640Leu).

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 aromatic (F) to medium size and hydrophobic (L)

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 LQT2.

Any additional useful information about the variant.

Other resources:

Links to websites of interest for the variant.

Variant rs199472970 [ dbSNP | Ensembl ]

Sequence information

Variant position:

640

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

Protein sequence length:

1159

The length of the canonical sequence.

Location on the sequence:

SSLTSVGFGNVSPNTNSEKI F SICVMLIGSLMYASIFGNVS

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                         SSLTSVGFGNVSPNTNSEKIFSICVMLIGSLMYASIFGNVS

Mouse                         SSLTSVGFGNVSPNTNSEKIFSICVMLIGSLMYASIFGNVS

Rat                           SSLTSVGFGNVSPNTNSEKIFSICVMLIGSLMYASIFGNVS

Rabbit                        SSLTSVGFGNVSPNTNSEKIFSICVMLIGSLMYASIFGNVS

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 – 1159	Potassium voltage-gated channel subfamily H member 2
Transmembrane	639 – 659	Helical; Name=Segment S6
Mutagenesis	629 – 629	N -> Q. Abolishes cell surface expression; has no effect on N-glycosylation.
Mutagenesis	631 – 631	S -> A. No effect on cell surface expression, but changes inactivation kinetics; when associated with Q-598.

Literature citations

Novel KCNQ1 and HERG missense mutations in Dutch long-QT families.
Jongbloed R.J.E.; Wilde A.A.M.; Geelen J.L.M.C.; Doevendans P.; Schaap C.; van Langen I.; van Tintelen J.P.; Cobben J.M.; Beaufort-Krol G.C.M.; Geraedts J.P.M.; Smeets H.J.M.;
Hum. Mutat. 13:301-310(1999)
Cited for: VARIANTS LQT2 PRO-558; CYS-582; SER-604; MET-613 AND LEU-640;

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q12809: Variant p.Phe640Leu