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UniProtKB/Swiss-Prot P23381: Variant p.His257Arg

Tryptophan--tRNA ligase, cytoplasmic
Gene: WARS
Variant information

Variant position:  257
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 Histidine (H) to Arginine (R) at position 257 (H257R, p.His257Arg).
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 polar (H) to large size and basic (R)
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

Involvement in disease:  Neuronopathy, distal hereditary motor, 9 (HMN9) [MIM:617721]: An autosomal dominant neurologic disorder characterized by juvenile onset of slowly progressive distal muscle weakness and atrophy affecting both the lower and upper limbs. {ECO:0000269|PubMed:28369220}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In HMN9; decreased tryptophan-tRNA ligase activity; dominant negative effect; decreased general protein synthesis; decreased cell viability; no effect on homodimerization.
Any additional useful information about the variant.



Sequence information

Variant position:  257
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  471
The length of the canonical sequence.

Location on the sequence:   DLDYMGMSSGFYKNVVKIQK  H VTFNQVKGIFGFTDSDCIGK
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                         DLDYMGMSSGFYKNVVKIQKHVTFNQVKGIFGFTDSDCIGK

Mouse                         DLEYMGQSPGFYRNVVKIQKHVTFNQVKGIFGFTDSDCIGK

Rat                           DLEYMGQSPGFYKNVVKIQKHVTFNQVKGIFGFTDSDCIGK

Bovine                        DLDYMGMSPGFYKNVVKIQKHVTFNQVKGIFGFTDSDCIGK

Rabbit                        DLDYMGMSPGFYKNVVKIQKHVTFNQVKGIFGFTDSDCIGK

Slime mold                    NLEYI---HHLYPNVLKIARCVNLNQIQNIFGFKESDAIGK

Baker's yeast                 DLQYMG--GAFYETVVRVSRQITGSTAKAVFGFNDSDCIGK

Fission yeast                 NSTYVG--GAFYQNVVRIAKCITANQSKACFGFTDSDSIGK

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 2 – 471 Tryptophan--tRNA ligase, cytoplasmic
Chain 71 – 471 T1-TrpRS
Chain 94 – 471 T2-TrpRS


Literature citations

A recurrent WARS mutation is a novel cause of autosomal dominant distal hereditary motor neuropathy.
Tsai P.C.; Soong B.W.; Mademan I.; Huang Y.H.; Liu C.R.; Hsiao C.T.; Wu H.T.; Liu T.T.; Liu Y.T.; Tseng Y.T.; Lin K.P.; Yang U.C.; Chung K.W.; Choi B.O.; Nicholson G.A.; Kennerson M.L.; Chan C.C.; De Jonghe P.; Cheng T.H.; Liao Y.C.; Zuechner S.; Baets J.; Lee Y.C.;
Brain 140:1252-1266(2017)
Cited for: FUNCTION; CATALYTIC ACTIVITY; SUBUNIT; INVOLVEMENT IN HMN9; VARIANT HMN9 ARG-257; VARIANT SER-443; CHARACTERIZATION OF VARIANT HMN9 ARG-257;

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.