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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P24557: Variant p.Glu449Lys

Thromboxane-A synthase
Gene: TBXAS1
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Variant information Variant position: help 449 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LB/B 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 Glutamate (E) to Lysine (K) at position 449 (E449K, p.Glu449Lys). 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 (E) to large size and basic (K) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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: help In allele CYP5A1*7; does not affect KM value for PEG2; does not affect Vmax/KM value. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 449 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 533 The length of the canonical sequence.
Location on the sequence: help AVLEMAVGALHHDPEHWPSP E TFNPERFTAEARQQHRPFTY 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                         AVLEMAVGALHHDPEHWPSPETFNPERFTAEARQQHRPFTY

Mouse                         TVLEIAVGALHHDPEHWPNPETFDPERFTAEARLQRRPFTY

Rat                           SVLEIAVGALHHDPEHWPNPETFDPERFTAEARLQQKPFTY

Pig                           TVLEVAVGALHHDPKHWPHPETFDPERFTAEAQRLQQPFTY

Bovine                        AVLETAVGALHYDPEHWPNPENFNPERFTAEAQQRRRPYTY

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 – 533 Thromboxane-A synthase
Topological domain 357 – 533 Cytoplasmic



Literature citations
Identification of genetic variants in the human thromboxane synthase gene (CYP5A1).
Chevalier D.; Lo-Guidice J.-M.; Sergent E.; Allorge D.; Debuysere H.; Ferrari N.; Libersa C.; Lhermitte M.; Broly F.;
Mutat. Res. 432:61-67(2001)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS HIS-60; GLU-160; SER-245; VAL-356; GLU-416; LYS-449; ASN-450 AND GLN-465; Catalog of 680 variations among eight cytochrome p450 (CYP) genes, nine esterase genes, and two other genes in the Japanese population.
Saito S.; Iida A.; Sekine A.; Kawauchi S.; Higuchi S.; Ogawa C.; Nakamura Y.;
J. Hum. Genet. 48:249-270(2003)
Cited for: VARIANTS ILE-124; LYS-388; LYS-449 AND GLN-501; Functional analysis of human thromboxane synthase polymorphic variants.
Chen C.Y.; Poole E.M.; Ulrich C.M.; Kulmacz R.J.; Wang L.H.;
Pharmacogenet. Genomics 22:653-658(2012)
Cited for: CATALYTIC ACTIVITY; FUNCTION; CHARACTERIZATION OF VARIANTS GLU-257; VAL-356; GLU-416; LYS-449 AND ASN-450; BIOPHYSICOCHEMICAL PROPERTIES;
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.