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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P54577: Variant p.Asp308Tyr

Tyrosine--tRNA ligase, cytoplasmic
Gene: YARS1
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Variant information Variant position: help 308 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Aspartate (D) to Tyrosine (Y) at position 308 (D308Y, p.Asp308Tyr). 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: help Change from medium size and acidic (D) to large size and aromatic (Y) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help Found in a patient with proximal-predominant motor neuropathy; likely pathogenic; loss of function. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 308 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 528 The length of the canonical sequence.
Location on the sequence: help TYTAYVDLEKDFAAEVVHPG D LKNSVEVALNKLLDPIREKF 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         TYTAYVDLEKDFAAEVVHPGDLKNSVEVALNKLLDPIREKF-

Mouse                         TYTVYLELEKDFAAEVVHPGDLKNSVEVALNKLLDPIREKF

Rat                           TYTIYQELEKDFAAEVVHPGDLKNSVEVALNKLLDPIREKF

Bovine                        TYTAYLDLEKDFADEVVHPGDLKNSVEVALNKLLDPIREKF

Chicken                       TYTAYETLEKDFAEQVVHPGDLKNSVEAALNKLLDPIREKF

Xenopus laevis                TYTDFETLEKDFAEELVHPGDLKASVEKALNKLLHPIREKF

Xenopus tropicalis            TYTDFETLEKDFTEQLVHPGDLKASVEKALNKLLDPIREKF

Zebrafish                     VYTDFEEVEKDFAAEQIHPGDLKASVELALNKLLDPIRKKF

Baker's yeast                 TYKSFEEMKLAFKEEKLSPPDLKIGVADAINELLEPIRQEF

Fission yeast                 VFKTYEEVEKAYKDLTLSPQDLKLGLESSVNTLLAGVQEQL
Sequence annotation in neighborhood: help 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 1 – 528 Tyrosine--tRNA ligase, cytoplasmic
Chain 2 – 528 Tyrosine--tRNA ligase, cytoplasmic, N-terminally processed
Helix 306 – 327



Literature citations
A missense, loss-of-function YARS1 variant in a patient with proximal-predominant motor neuropathy.
Forrest M.E.; Meyer A.P.; Laureano Figueroa S.M.; Antonellis A.;
Cold Spring Harb. Mol. Case Stud. 8:a006246-a006246(2022)
Cited for: VARIANT TYR-308; INVOLVEMENT IN PROXIMAL-PREDOMINANT MOTOR NEUROPATHY;
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.