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UniProtKB/Swiss-Prot P32754: Variant p.Ala268Val

4-hydroxyphenylpyruvate dioxygenase
Gene: HPD
Variant information

Variant position:  268
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 Alanine (A) to Valine (V) at position 268 (A268V, p.Ala268Val).
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 small size and hydrophobic (A) to medium size and hydrophobic (V)
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

Variant description:  In TYRSN3.
Any additional useful information about the variant.



Sequence information

Variant position:  268
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  393
The length of the canonical sequence.

Location on the sequence:   KKSQIQEYVDYNGGAGVQHI  A LKTEDIITAIRHLRERGLEF
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                         KK--SQIQEYVDYNGGAGVQHIALKTEDIITAIRHLRERGLEF

Mouse                         KK--SQIQEYVDYNGGAGVQHIALKTEDIITAIRHLRERGT

Rat                           KK--SQIQEYVDYNGGAGVQHIALRTEDIITTIRHLRERGM

Pig                           KK--SQIQEYVDYNGGAGVQHIALKTEDIITAIRSLRERGV

Bovine                        KK--SQIQEYVDYNGGAGVQHIALKTKDIITAIRHLRERGV

Xenopus tropicalis            KK--SQIQEYVDYYGSAGVQHIALNTSNIIKAVKNLKSRGI

Zebrafish                     KK--SQIQEYIDYNGGPGVQHIALNTSNIIQAIVNLRARGL

Caenorhabditis elegans        KKAISQIQEYVDYYGGSGVQHIALNTSDIITAIEALRARGC

Slime mold                    RK--SQIQEYVDFYNGAGVQHIALKTDNIIDAISKLRSRGV

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 – 393 4-hydroxyphenylpyruvate dioxygenase
Domain 180 – 338 VOC 2
Metal binding 266 – 266 Iron
Modified residue 250 – 250 Phosphoserine
Beta strand 261 – 272


Literature citations

Mutations in the 4-hydroxyphenylpyruvic acid dioxygenase gene are responsible for tyrosinemia type III and hawkinsinuria.
Tomoeda K.; Awata H.; Matsuura T.; Matsuda I.; Ploechl E.; Milovac T.; Boneh A.; Scott C.R.; Danks D.M.; Endo F.;
Mol. Genet. Metab. 71:506-510(2000)
Cited for: VARIANT TYRSN3 VAL-268; VARIANT HAWK THR-33;

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.