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UniProtKB/Swiss-Prot P02708: Variant p.Phe253Val

Acetylcholine receptor subunit alpha
Gene: CHRNA1
Variant information

Variant position:  253
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 Valine (V) at position 253 (F253V, p.Phe253Val).
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 (V)
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 CMS1B; markedly reduced protein expression.
Any additional useful information about the variant.

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



Sequence information

Variant position:  253
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  457
The length of the canonical sequence.

Location on the sequence:   YFIVNVIIPCLLFSFLTGLV  F YLPTDSGEKMTLSISVLLSL
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.

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 21 – 457 Acetylcholine receptor subunit alpha
Transmembrane 233 – 253 Helical
Mutagenesis 261 – 261 E -> Q. Changed acetylcholine-gated cation-selective channel activity.
Beta strand 243 – 254


Literature citations

Acetylcholine receptor M3 domain: stereochemical and volume contributions to channel gating.
Wang H.-L.; Milone M.; Ohno K.; Shen X.-M.; Tsujino A.; Batocchi A.-P.; Tonali P.; Brengman J.; Engel A.G.; Sine S.M.;
Nat. Neurosci. 2:226-233(1999)
Cited for: VARIANTS CMS1B VAL-253 AND ILE-305; CHARACTERIZATION OF VARIANTS CMS1B VAL-253 AND ILE-305;

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.