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UniProtKB/Swiss-Prot P00492: Variant p.Asp20Val

Hypoxanthine-guanine phosphoribosyltransferase
Gene: HPRT1
Variant information

Variant position:  20
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 Aspartate (D) to Valine (V) at position 20 (D20V, p.Asp20Val).
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 acidic (D) to medium size and hydrophobic (V)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Gout HPRT-related (GOUT-HPRT) [MIM:300323]: Characterized by partial enzyme activity and hyperuricemia. {ECO:0000269|PubMed:15571223, ECO:0000269|PubMed:17027311, ECO:0000269|PubMed:20544509, ECO:0000269|PubMed:24940672, ECO:0000269|PubMed:2896620, ECO:0000269|PubMed:2909537, ECO:0000269|PubMed:3198771, ECO:0000269|PubMed:3358423, ECO:0000269|PubMed:6572373, ECO:0000269|PubMed:6706936, ECO:0000269|PubMed:6853490, ECO:0000269|PubMed:7987318}. 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 GOUT-HPRT; Mashad; strongly reduces enzymatic activity.
Any additional useful information about the variant.



Sequence information

Variant position:  20
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  218
The length of the canonical sequence.

Location on the sequence:   MATRSPGVVISDDEPGYDL  D LFCIPNHYAEDLERVFIPHG
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                         MATRSPGVVISDDEPGYDLDLFCIPNHYAEDLERVFIPHG

                              MATRSLGVVISDDEPGYDLDLFCIPHHYAEDLEKVFIPHG

Chimpanzee                    MATRSPGVVISDDEPGYDLDLFCIPNHYAEDLERVFIPHG

Mouse                         MPTRSPSVVISDDEPGYDLDLFCIPNHYAEDLEKVFIPHG

Rat                           MSTLSPSVVISDDEPGYDLDLFCIPNHYAEDLEKVFIPHG

Pig                           MATRSPSVVISDDEPGYDLDLFCIPNHYAEDLEKVFIPHG

Bovine                        MAARSPSVVISDDEPGYDLNLFCIPNHYAEDLEKVFIPHG

Chicken                       MATHSPCIVIGDDEQGYDLDLFCIPKHYADDLEKVYIPHG

Slime mold                    ---MSREVIFTEKE--------------------------

Baker's yeast                 MSANDKQYISYNNV------------------------HQ

Fission yeast                 -MDPVRLYYSYNDI------------------------HK

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
Initiator methionine 1 – 1 Removed
Chain 2 – 218 Hypoxanthine-guanine phosphoribosyltransferase
Modified residue 2 – 2 N-acetylalanine
Helix 19 – 21


Literature citations

Hypoxanthine guanine phosphoribosyltransferase (HPRT) deficiencies: HPRT1 mutations in new Japanese families and PRPP concentration.
Yamada Y.; Nomura N.; Yamada K.; Kimura R.; Fukushi D.; Wakamatsu N.; Matsuda Y.; Yamauchi T.; Ueda T.; Hasegawa H.; Nakamura M.; Ichida K.; Kaneko K.; Fujimori S.;
Nucleosides Nucleotides Nucleic Acids 33:218-222(2014)
Cited for: INVOLVEMENT IN LNS; INVOLVEMENT IN GOUT-HPRT; VARIANTS GOUT-HPRT VAL-20; PHE-23 AND ARG-60; CHARACTERIZATION OF VARIANTS GOUT-HPRT VAL-20; PHE-23 AND ARG-60;

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.