F5HN72 · CPAO_ASPOZ
- ProteinBeta-cyclopiazonate dehydrogenase
- GenecpaO
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids455 (go to sequence)
- Protein existenceEvidence at protein level
- Annotation score3/5
Function
function
Beta-cyclopiazonate dehydrogenase; part of the gene cluster that mediates the biosynthesis of the fungal neurotoxin cyclopiazonic acid (CPA), a nanomolar inhibitor of Ca2+-ATPase with a unique pentacyclic indole tetramic acid scaffold (PubMed:21608094).
The hybrid two module polyketide synthase-nonribosomal peptide synthetase (PKS-NRPS) cpaS incorporates acetyl-CoA, malonyl-CoA, and tryptophan (Trp) and utilizes a C-terminal redox-incompetent reductase domain to make and release the tryptophan tetramic acid, cyclo-acetoacetyl-L-tryptophan (c-AATrp), as the first intermediate in the pathway. CpaS catalyzes a Dieckmann-type cyclization on the N-acetoacetyl-Trp intermediate bound in thioester linkage to the phosphopantetheinyl arm of the T domain to form and release c-AATrp (PubMed:19663400).
CpaD then regiospecifically dimethylallylates c-AATrp to form beta-cyclopiazonic acid. CpaD discriminates against free Trp but accepts tryptophan-containing thiohydantoins, diketopiperazines, and linear peptides as substrates for C4-prenylation and also acts as regiospecific O-dimethylallyltransferase (DMAT) on a tyrosine-derived tetramic acid (PubMed:19877600, PubMed:21608094).
The beta-cyclopiazonate dehydrogenase cpaO then carries out the dehydrogenation of beta-CPA to yield an unstable enimine product, which is captured by intramolecular cyclization to create the pentacyclic fused scaffold of alpha-cyclopiazonate (PubMed:21608094).
Finally, the cytochrome P450 monooxygenase cpaH mediates the conversion of CPA into the less toxic 2-oxocyclopiazonic acid, the end product of the CPA pathway in A.oryza (PubMed:21608094).
The hybrid two module polyketide synthase-nonribosomal peptide synthetase (PKS-NRPS) cpaS incorporates acetyl-CoA, malonyl-CoA, and tryptophan (Trp) and utilizes a C-terminal redox-incompetent reductase domain to make and release the tryptophan tetramic acid, cyclo-acetoacetyl-L-tryptophan (c-AATrp), as the first intermediate in the pathway. CpaS catalyzes a Dieckmann-type cyclization on the N-acetoacetyl-Trp intermediate bound in thioester linkage to the phosphopantetheinyl arm of the T domain to form and release c-AATrp (PubMed:19663400).
CpaD then regiospecifically dimethylallylates c-AATrp to form beta-cyclopiazonic acid. CpaD discriminates against free Trp but accepts tryptophan-containing thiohydantoins, diketopiperazines, and linear peptides as substrates for C4-prenylation and also acts as regiospecific O-dimethylallyltransferase (DMAT) on a tyrosine-derived tetramic acid (PubMed:19877600, PubMed:21608094).
The beta-cyclopiazonate dehydrogenase cpaO then carries out the dehydrogenation of beta-CPA to yield an unstable enimine product, which is captured by intramolecular cyclization to create the pentacyclic fused scaffold of alpha-cyclopiazonate (PubMed:21608094).
Finally, the cytochrome P450 monooxygenase cpaH mediates the conversion of CPA into the less toxic 2-oxocyclopiazonic acid, the end product of the CPA pathway in A.oryza (PubMed:21608094).
Catalytic activity
- beta-cyclopiazonate + A = alpha-cyclopiazonate + AH2
Cofactor
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | beta-cyclopiazonate dehydrogenase activity |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameBeta-cyclopiazonate dehydrogenase
- EC number
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageEukaryota > Fungi > Dikarya > Ascomycota > Pezizomycotina > Eurotiomycetes > Eurotiomycetidae > Eurotiales > Aspergillaceae > Aspergillus > Aspergillus subgen. Circumdati
Accessions
- Primary accessionF5HN72
Organism-specific databases
Phenotypes & Variants
Disruption phenotype
Impairs the production of cyclopiazonic acid, but accumulates its biosynthetic intermediates cyclo-acetoacetyl-L-tryptophan and beta-cyclopiazonic acid.
PTM/Processing
Features
Showing features for signal, chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Signal | 1-25 | |||||
Sequence: MAVRIARFLGLSTVAYLALANGIDA | ||||||
Chain | PRO_0000430691 | 26-455 | Beta-cyclopiazonate dehydrogenase | |||
Sequence: RDTISRDVIILGGGSSGTYAAIRLRDQGKTVAVVERNNYLGGHGETYYTEDNTPLNFGVEGFFNTTVTRNYLERLQVPYGRRDPAPAHEDYVNLNTGQRTEYTPGQLQDREAFAKWVDAISQFGFLDDGVYRIPEPVPEDLISPFADFVKKYHLEDAVYALFSHTSGDVLEMITLYVIQYIGVPHAAALNEGYVRPIEGIAALYKSAGKELGSDVLLETTPEAVQRFEDGVEVIVRSADGTKTLLKGKQLLVTIPPLLENLHGFPLSDQESRLFSKWQYHQYWAALVNDTGLPDDVNIVNVDTERLYGVPEEPFIWRLDNHWAPGYHNIKLVGGSEFGEDEAKAYMYERLDLLHAEGTYATHKPEIVKFASHTPVTMFVSAEEIRGGFYRQLYELQGLNSTFWTGATWASDYSTLLWGYTDEVLDQMASS |
Structure
Sequence
- Sequence statusComplete
- Sequence processingThe displayed sequence is further processed into a mature form.
- Length455
- Mass (Da)50,983
- Last updated2011-07-27 v1
- Checksum387A45ECE71D7A72
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AB506492 EMBL· GenBank· DDBJ | BAK26560.1 EMBL· GenBank· DDBJ | Genomic DNA |