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UniProtKB/Swiss-Prot P61457: Variant p.Arg88Gln

Pterin-4-alpha-carbinolamine dehydratase
Gene: PCBD1
Variant information

Variant position:  88
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 Arginine (R) to Glutamine (Q) at position 88 (R88Q, p.Arg88Gln).
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 basic (R) to medium size and polar (Q)
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

Involvement in disease:  Hyperphenylalaninemia, BH4-deficient, D (HPABH4D) [MIM:264070]: An autosomal recessive disease characterized by primapterinuria, a variant form of hyperphenylalaninemia defined by increased excretion of 7-substituted pterins in the urine. Patients with primapterinuria show an increased ratio of neopterin to biopterin in the urine, excretion of subnormal levels of biopterins, and normal levels of biogenic amines in cerebrospinal fluid. Neurologic signs are mild, present in the neonatal period only, and include hypotonia, delayed motor development and tremor. {ECO:0000269|PubMed:8352282, ECO:0000269|PubMed:9760199}. 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 HPABH4D.
Any additional useful information about the variant.

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

Sequence information

Variant position:  88
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  104
The length of the canonical sequence.

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.


Mouse                         NVYNKVHITLSTHEC-------AGLSERDINLASFIE

Rat                           NVYNKVHITLSTHEC-------AGLSERDINLASFIE

Bovine                        NVYNKVHITLSTHEC-------AGLSERDVNLASFIE

Chicken                       NVYNKVHITLSTHEC-------TGLSERDINLASFIE

Xenopus laevis                NVYDKVHITLSTHDC-------GGLSERDINLASFIE

Caenorhabditis elegans        NVYNKVDITLSTHDC-------GGLSPNDVKLATFIE

Drosophila                    NCYNKVDVTLSTHDV-------GGLSSQDIRMATHLE

Slime mold                    NVYNRVEITLATHDC-------SGLSVNDTKMADIMN


Fission yeast                 NVYNKVDITLTTHDT-------KGLTEKDLKLAEFID

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.

Chain 2 – 104 Pterin-4-alpha-carbinolamine dehydratase

Literature citations

Mutations in the pterin-4alpha-carbinolamine dehydratase (PCBD) gene cause a benign form of hyperphenylalaninemia.
Thoeny B.; Neuheiser F.; Kierat L.; Rolland M.O.; Guibaud P.; Schlueter T.; Germann R.; Heidenreich R.A.; Duran M.; de Klerk J.B.C.; Ayling J.E.; Blau N.;
Hum. Genet. 103:162-167(1998)

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.