UniProtKB/Swiss-Prot P00492: Variant p.Ala161Ser

Hypoxanthine-guanine phosphoribosyltransferase
Gene: HPRT1
Chromosomal location: Xq26.1
Variant information

Variant position:  161
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Alanine (A) to Serine (S) at position 161 (A161S, p.Ala161Ser).
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 small size and polar (S)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  In GOUT-HPRT; Milwaukee/RJK 949.
Any additional useful information about the variant.



Sequence information

Variant position:  161
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:   KTMQTLLSLVRQYNPKMVKV  A SLLVKRTPRSVGYKPDFVGF
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                         KTMQTLLSLVRQYNPKMVK-----------------VASLLVKRTPRSVGYKPD--------FVGF

Chimpanzee                    KTMQTLLSLVRQYNPKMVK-----------------VASLL

Mouse                         KTMQTLLSLVKQYSPKMVK-----------------VASLL

Rat                           KTMQTLLSLVKQYSPKMVK-----------------VASLL

Pig                           KTMQTLLSLVKQHNPKMVK-----------------VASLL

Bovine                        KTMQTLLALVKKHKPKMVK-----------------VASLL

Dog                           KTMQTLLSLVKEHNPKMVK-----------------VASLL

Chicken                       KTMKTLLSLLKQYNPKMVK-----------------VASLL

Slime mold                    LTLKHLMELLNHRNPNSLH-----------------TAVLL

Baker's yeast                 TTLHYALSELEKDAAEQAKAKGIDTEKSPEMKTNFGIFVLH

Fission yeast                 TTLHYALRELQRDVAEQAKKLNREGEK-----TTFGIFVVH

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
Binding site 166 – 166 GMP
Beta strand 156 – 166


Literature citations

Multiplex DNA deletion detection and exon sequencing of the hypoxanthine phosphoribosyltransferase gene in Lesch-Nyhan families.
Gibbs R.A.; Nguyen P.N.; Edwards A.; Civitello A.B.; Caskey C.T.;
Genomics 7:235-244(1990)
Cited for: VARIANTS LNS RJK LYS-45; LEU-74; ASP-130; SER-131; LYS-143; SER-161; TYR-177; ASN-194; VAL-199; ASP-204 AND TYR-206;

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.