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UniProtKB/Swiss-Prot P00492: Variant p.Tyr195Cys

Hypoxanthine-guanine phosphoribosyltransferase
Gene: HPRT1
Variant information

Variant position:  195
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 Tyrosine (Y) to Cysteine (C) at position 195 (Y195C, p.Tyr195Cys).
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 large size and aromatic (Y) to medium size and polar (C)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
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; Dirranbandi, Asia.
Any additional useful information about the variant.



Sequence information

Variant position:  195
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:   KPDFVGFEIPDKFVVGYALD  Y NEYFRDLNHVCVISETGKAK
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                         KPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCVISETG---KAK

                              KPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCV

Chimpanzee                    KPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCV

Mouse                         RPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCV

Rat                           RPD--------FVGFEIPDKFVVGYALDYNEHFRDLNHVCV

Pig                           RPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCV

Bovine                        KPD--------FVGFEIPDKFVVGYALDYNEYFRDLNHVCV

Chicken                       RPD--------FVGFEVPDKFVVGYALDYNEYFRDLNHICV

Slime mold                    PVK--------YMGFDIPMVFIIGYGLDFAENYRELPYLGE

Baker's yeast                 PAEMLNDKNRYFAAKTVPDKWYA-YPWESTDIVFHTRMAIE

Fission yeast                 DKEILD--KYYFTGCNTPDCWIM-YPWEAQDIEEHDSHVAK

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 – 218 Hypoxanthine-guanine phosphoribosyltransferase
Metal binding 194 – 194 Magnesium
Binding site 194 – 194 GMP; via carbonyl oxygen
Beta strand 195 – 197


Literature citations

Mutations in the hypoxanthine guanine phosphoribosyltransferase gene (HPRT1) in Asian HPRT deficient families.
Yamada Y.; Yamada K.; Sonta S.; Wakamatsu N.; Ogasawara N.;
Nucleosides Nucleotides Nucleic Acids 23:1169-1172(2004)
Cited for: VARIANTS LNS PRO-64; PRO-65; GLU-70; CYS-72; GLN-78; PRO-147; GLU-159 AND 107-ASN--SER-110 DEL; VARIANTS GOUT-HPRT ALA-188; VAL-192 AND CYS-195;

Molecular analysis of HPRT deficiencies: an update of the spectrum of Asian mutations with novel mutations.
Yamada Y.; Nomura N.; Yamada K.; Wakamatsu N.;
Mol. Genet. Metab. 90:70-76(2007)
Cited for: VARIANTS LNS VAL-8 DEL; TYR-28 DEL; PRO-64; PRO-65; GLU-70; CYS-72; GLN-78; PRO-147; GLU-159; VAL-159 INS AND ALA-188; VARIANTS GOUT-HPRT PRO-124; GLY-185; VAL-192 AND CYS-195;

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.