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UniProtKB/Swiss-Prot Q13315: Variant p.Trp2491Arg

Serine-protein kinase ATM
Gene: ATM
Variant information

Variant position:  2491
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 Tryptophan (W) to Arginine (R) at position 2491 (W2491R, p.Trp2491Arg).
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 (W) to large size and basic (R)
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 AT.
Any additional useful information about the variant.

Sequence information

Variant position:  2491
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  3056
The length of the canonical sequence.

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.


Mouse                         IN-CLLSGEEHDL---------WVFRLCSLWLENSGVSEVN

Pig                           IN-CLLSGEGHDM---------WIFRLCSLWLENSGVSEVN


Drosophila                    MAYCRLDSGFSSA---------AIYRIISLWFTNATSKQCQ

Baker's yeast                 LNTLVFSNRYDND---------IIDKFCGLWFENDDNSKIN

Fission yeast                 LK-CLSESDENDV---------LISRCCTMWLSNSHLDELN

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 2 – 3056 Serine-protein kinase ATM
Domain 1940 – 2566 FAT
Helix 2484 – 2493

Literature citations

Ataxia-telangiectasia in the Japanese population: identification of R1917X, W2491R, R2909G, IVS33+2T-->A, and 7883del5, the latter two being relatively common mutations.
Fukao T.; Song X.-Q.; Yoshida T.; Tashita H.; Kaneko H.; Teramoto T.; Inoue R.; Katamura K.; Mayumi M.; Hiratani M.; Taniguchi N.; Arai J.; Wakiguchi H.; Bar-Shira A.; Shiloh Y.; Kondo N.;
Hum. Mutat. 12:338-343(1998)
Cited for: VARIANTS AT ARG-2491 AND GLY-2909;

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.