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UniProtKB/Swiss-Prot P06132: Variant p.Arg332His

Uroporphyrinogen decarboxylase
Gene: UROD
Variant information

Variant position:  332
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 Histidine (H) at position 332 (R332H, p.Arg332His).
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 (H)
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

Involvement in disease:  Familial porphyria cutanea tarda (FPCT) [MIM:176100]: A form of porphyria. Porphyrias are inherited defects in the biosynthesis of heme, resulting in the accumulation and increased excretion of porphyrins or porphyrin precursors. They are classified as erythropoietic or hepatic, depending on whether the enzyme deficiency occurs in red blood cells or in the liver. Familial porphyria cutanea tarda is an autosomal dominant disorder characterized by light-sensitive dermatitis, with onset in later life. It is associated with the excretion of large amounts of uroporphyrin in the urine. Iron overload is often present in association with varying degrees of liver damage. {ECO:0000269|PubMed:10338097, ECO:0000269|PubMed:10477430, ECO:0000269|PubMed:11069625, ECO:0000269|PubMed:11295834, ECO:0000269|PubMed:11719352, ECO:0000269|PubMed:2243121, ECO:0000269|PubMed:2920211, ECO:0000269|PubMed:7706766, ECO:0000269|PubMed:8896428, ECO:0000269|PubMed:9792863}. 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 FPCT.
Any additional useful information about the variant.

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



Sequence information

Variant position:  332
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  367
The length of the canonical sequence.

Location on the sequence:   ASEEEIGQLVKQMLDDFGPH  R YIANLGHGLYPDMDPEHVGA
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                         ASEEEIGQLVKQMLDDFG--PHRYIANLGHGLYPDMDPEHVGA

Mouse                         ASEEEIGRLVQQMLDDFG--PQRYIANLGHGLYPDMDPERV

Sheep                         ASEEEIGKLVQQMLNDFG--PQRYIANLGHGLYPDMDPEHV

Zebrafish                     GTKESISEIVRRMLEGFG--TKGYIANLGHGLYPDMDPENV

Drosophila                    RDPDELRNLTTEMVHKFG--KSRYIANLGHGITPQTPITSM

Slime mold                    CGDQVIRDQTQKMLQSFG-TTKRLIANLGHGMHPTHPIEGP

Baker's yeast                 GSKEVITKKVKQMIEAFGGGKSRYIVNFGHGTHPFMDPDVI

Fission yeast                 GTREIIEARTKEMIQDFGGGKQGYIINLGHGITPGVNPDDV

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 1 – 367 Uroporphyrinogen decarboxylase
Binding site 339 – 339 Substrate
Beta strand 330 – 339


Literature citations

Familial porphyria cutanea tarda: characterization of seven novel uroporphyrinogen decarboxylase mutations and frequency of common hemochromatosis alleles.
Mendez M.; Sorkin L.; Rossetti M.V.; Astrin K.H.; Batlle A.M.C.; Parera V.E.; Aizencang G.I.; Desnick R.J.;
Am. J. Hum. Genet. 63:1363-1375(1998)
Cited for: VARIANTS FPCT ARG-165; PHE-195; LYS-304 AND HIS-332;

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.