UniProtKB/SwissProt variant VAR

Variant information

Variant position:

331

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 Arginine (R) to Tryptophan (W) at position 331 (R331W, p.Arg331Trp).

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 large size and aromatic (W)

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 CMS4C; shortens burst duration 2-fold by slowing the rate of channel opening and speeding the rate of ACh dissociation; has a mild fast-channel kinetic effect on the AChR by shortening the long burst and increasing the decay of the endplate current.

Any additional useful information about the variant.

Other resources:

Links to websites of interest for the variant.

Variant rs121909515 [ dbSNP | Ensembl ]

Sequence information

Variant position:

331

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

Protein sequence length:

493

The length of the canonical sequence.

Location on the sequence:

VMVVATLIVMNCVIVLNVSQ R TPTTHAMSPRLRHVLLELLP

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                         VMVVATLIVMNCVIVLNVSQRTPTTHAMSPRLRHVLLELLP

Mouse                         VMVVATLIVMNCVIVLNVSLRTPTTHATSPRLRQILLELLP

Rat                           VMVVATLIVMNCVIVLNVSLRTPTTHATSPRLRQILLELLP

Bovine                        VMVVATLIVMNCVIVLNVSLRTPTTHAMSPRLRYVLLELLP

Xenopus laevis                VMFVSTLIVLSCVIVLNVSLRSPSTHNLSTKVKHMLLEVLP

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	21 – 493	Acetylcholine receptor subunit epsilon
Topological domain	329 – 456	Cytoplasmic

Literature citations

Congenital myasthenic syndromes due to heteroallelic nonsense/missense mutations in the acetylcholine receptor epsilon subunit gene: identification and functional characterization of six new mutations.
Ohno K.; Quiram P.A.; Milone M.; Wang H.-L.; Harper M.C.; Pruitt J.N. II; Brengman J.M.; Pao L.; Fischbeck K.H.; Crawford T.O.; Sine S.M.; Engel A.G.;
Hum. Mol. Genet. 6:753-766(1997)
Cited for: VARIANTS CMS4C LEU-167; LEU-265 AND TRP-331; CHARACTERIZATION OF VARIANTS CMS4C LEU-167; LEU-265 AND TRP-331;

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q04844: Variant p.Arg331Trp