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Reviewed, UniProtKB/Swiss-Prot P06132 (DCUP_HUMAN)

Last modified November 4, 2008. Version 109. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (8) | Third-party data | Customize display text xml rdf/xml gff fasta
Names and origin · Protein attributes · General annotation (Comments) · Ontologies · Sequence annotation (Features) · Sequences · References · Web resources · Cross-references · Entry information · Relevant documents

Names and origin

Protein namesRecommended name:
    Uroporphyrinogen decarboxylase
      Short name=URO-D
      Short name=UPD
    EC=4.1.1.37
Gene names
Name: UROD
OrganismHomo sapiens (Human)
Taxonomic identifier9606 [NCBI]
Taxonomic lineageEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo

Protein attributes

Sequence length367 AA.
Sequence statusComplete.
Sequence processingThe displayed sequence is not processed.
Protein existenceEvidence at protein level.

General annotation (Comments)

Function

Catalyzes the decarboxylation of four acetate groups of uroporphyrinogen III to yield coproporphyrinogen III.

Catalytic activity

Uroporphyrinogen III = coproporphyrinogen + 4 CO(2).

Pathway

Porphyrin metabolism; protoporphyrin-IX biosynthesis; coproporphyrinogen III from 5-aminolevulinate: step 4/4.

Subunit structure

Homodimer.

Subcellular location

Cytoplasm.

Involvement in disease

Defects in UROD are the cause of familial porphyria cutanea tarda (FPCT) [MIM:176100]; also known as porphyria cutanea tarda type II. FPCT 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. Besides the familial form of PCT, a relatively common idiosyncratic form is known in which only the liver enzyme is reduced. This form is referred to as porphyria cutanea tarda "sporadic " type or type I [MIM:176090]. PCT type I occurs sporadically as an unusual accompaniment of common hepatic disorders such as alcohol-associated liver disease.

Defects in UROD are the cause of hepatoerythropoietic porphyria (HEP) [MIM:176100]. HEP is a rare autosomal recessive disorder. It is the severe form of cutaneous porphyria, and presents in infancy. The level of UROD is very low in erythrocytes and cultured skin fibroblasts, suggesting that HEP is the homozygous state for porphyria cutanea tarda.

Sequence similarities

Belongs to the uroporphyrinogen decarboxylase family.

Ontologies

Keywords

   Biological processHeme biosynthesis
Porphyrin biosynthesis
   Cellular componentCytoplasm
   DiseaseDisease mutation
   Molecular functionDecarboxylase
Lyase
   PTMAcetylation
Phosphoprotein
   Technical term3D-structure
Direct protein sequencing

Gene Ontology (GO)

   Molecular functionuroporphyrinogen decarboxylase activity Ref.18

Traceable author statement. Source: ProtInc

Complete GO annotation...

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 367367Uroporphyrinogen decarboxylase
PRO_0000187569

Regions

Region37 – 415Substrate binding

Sites

Binding site551Substrate
Binding site851Substrate
Binding site861Substrate
Binding site1641Substrate
Binding site2191Substrate
Binding site3391Substrate
Site861Transition state stabilizer

Amino acid modifications

Modified residue11N-acetylmethionine
Modified residue611Phosphoserine By similarity

Natural variations

Natural variant251G → E in FPCT; insoluble protein.
VAR_022567
Natural variant461F → L in HEP; mild phenotype; strong decrease of activity.
VAR_022568
Natural variant621P → L in HEP.
VAR_009103
Natural variant801A → G in HEP.
VAR_007910
Natural variant801A → S in FPCT; decrease of activity.
VAR_022569
Natural variant1341V → Q in FPCT and HEP; requires 2 nucleotide substitutions; nearly normal activity.
VAR_009104
Natural variant1421R → Q in FPCT.
VAR_010985
Natural variant1441R → P in FPCT; decrease of activity.
VAR_022570
Natural variant1561G → D in FPCT; decrease of activity.
VAR_022571
Natural variant1611L → Q in FPCT.
VAR_010986
Natural variant1651M → R in FPCT; activity < 2%.
VAR_007911
Natural variant1671E → K in HEP and FPCT; nearly normal activity.
VAR_007714
Natural variant1931R → P in FPCT; insoluble protein.
VAR_022572
Natural variant1951L → F in FPCT.
VAR_007912
Natural variant2161L → Q in FPCT.
VAR_022573
Natural variant2181E → K in FPCT; significant decrease of activity.
VAR_022574
Natural variant2191S → F in FPCT.
VAR_010987
Natural variant2201H → P in HEP; mild form.
VAR_009105
Natural variant2291F → L in FPCT.
VAR_009106
Natural variant2321F → L in FPCT; decrease of activity.
VAR_022575
Natural variant2351P → S in FPCT.
VAR_010988
Natural variant2531L → Q in FPCT; decrease of activity.
VAR_007913
Natural variant2601I → T in FPCT; decrease of activity.
VAR_022576
Natural variant2811G → E in FPTC and HEP.
VAR_007715
Natural variant2811G → V in FPCT.
VAR_007716
Natural variant2821L → R in FPCT.
VAR_022577
Natural variant2921R → G in HEP.
VAR_007717
Natural variant3031G → S in FPCT.
VAR_022578
Natural variant3041N → K in FPCT.
VAR_007914
Natural variant3111Y → C in HEP.
VAR_009107
Natural variant3181G → R in FPCT.
VAR_007915
Natural variant3241M → T in FPCT.
VAR_009108
Natural variant3321R → H in FPCT.
VAR_007916
Natural variant3341I → T in FPCT.
VAR_007917

Experimental info

Mutagenesis861D → E: 5-10% of wild-type activity
Mutagenesis861D → G: Very low activity. Binds substrate with similar geometry as wild-type
Mutagenesis861D → N: No activity. Unable to bind substrate
Mutagenesis1641Y → F: 25-30% of wild-type activity
Sequence conflict771P → L Ref.2 Ref.4
Sequence conflict1031G → S in AAA61258. Ref.1
Sequence conflict1031G → S in AAB59456. Ref.10
Sequence conflict1201R → A in AAA61258. Ref.1
Sequence conflict1201R → A in AAB59456. Ref.10
Sequence conflict212 – 2143Missing in AAB59456. Ref.10
Sequence conflict3031G → V in AAH01778. Ref.8

Secondary structure

............................................................ 367
Helix Strand Turn

Details...

Sequences

Sequence LengthMass (Da)Tools
P06132-1 [UniParc].

Last modified November 1, 1997. Version 2.
Checksum: 840510B36CFC3856

FASTA36740,787