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UniProtKB/Swiss-Prot P32754: Variant p.Ala33Thr

4-hydroxyphenylpyruvate dioxygenase
Gene: HPD
Variant information

Variant position:  33
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Alanine (A) to Threonine (T) at position 33 (A33T, p.Ala33Thr).
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 polar (T)
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 two patients with hawkinsinuria.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  33
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:   RGRFLHFHSVTFWVGNAKQA  A SFYCSKMGFEPLAYRGLETG
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                         RGRFLHFHSVTFWVGNAKQAASFYCSKMGFEPLAYRGLETG

Mouse                         RGRFLHFHSVTFWVGNAKQAASFYCNKMGFEPLAYRGLETG

Rat                           RGRFLHFHSVTFWVGNAKQAASFYCNKMGFEPLAYKGLETG

Pig                           RGRFLHFHSVTFWVGNAKQAASYYCSKIGFEPLAYKGLETG

Bovine                        RGRFLHFHSVTFWVGNAKQAASYYCSKLGFEPLAYKGLETG

Xenopus tropicalis            RGRFLSFHHLTFWVGNAKQAASFYCDKFGFEPCAYKGLETG

Zebrafish                     RGKFLNFHHIKFWVGNAKQAAVFYCDKFGFEPLAYKGLETG

Caenorhabditis elegans        IGTFVAFDHVRFVVGNAKQAAYWYCANFGFEPFAYKGLETG

Slime mold                    ------FDHVTFWVGNALQAATYYIARFGFQNLAYSGLETG

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 18 – 149 VOC 1
Alternative sequence 1 – 39 Missing. In isoform 2.
Helix 29 – 40


Literature citations

Mutations in the 4-hydroxyphenylpyruvate dioxygenase gene (HPD) in patients with tyrosinemia type III.
Rueetschi U.; Cerone R.; Perez-Cerda C.; Schiaffino M.C.; Standing S.; Ugarte M.; Holme E.;
Hum. Genet. 106:654-662(2000)
Cited for: VARIANTS TYRSN3 CYS-160 AND MET-335; VARIANTS THR-33; PHE-267 AND LEU-340;

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.