A0A4P8WAD3 · PYIA_PYRGI
- ProteinO-methyltransferase pyiA
- GenepyiA
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids409 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
O-methyltransferase; part of the gene cluster that mediates the biosynthesis of the mycotoxin pyrichalasin H, a tyrosine-derived cytochalasan that inhibits the growth of rice seedlings, but also inhibits lymphocyte capping and actin polymerization and alters cell morphology (Probable) (PubMed:31099577).
Pyrichalasin H is indicated as the responsible agent for the genus-specific pathogenicity of M.grisea toward crabgrass (PubMed:31099577).
The first step in the pathway is catalyzed by the O-methyltransferase pyiA which methylates free tyrosine to generate the precursor O-methyltyrosine (PubMed:31099577).
The hybrid PKS-NRPS pyiS, assisted by the enoyl reductase pyiC, are responsible for fusion of the O-methyltyrosine precursor and the polyketide backbone (PubMed:31099577).
The polyketide synthase module (PKS) of pyiS is responsible for the synthesis of the polyketide backbone and the downstream nonribosomal peptide synthetase (NRPS) amidates the carboxyl end of the polyketide with the O-methyltyrosine precursor (PubMed:31099577).
As the NRPS A-domain demonstrates substrate tolerance, pyiS can also use phenylalanine, tyrosine and even para-chlorophenylalanine as amino acid precursor, which leads to the production of novel cytochalasans, including halogenated cytochalasans (PubMed:31099577).
Because pyiS lacks a designated enoylreductase (ER) domain, the required activity is provided the enoyl reductase pyiC (PubMed:31099577).
Reduction by the hydrolyase pyiE leads to 1,5-dihydropyrrolone, which is substrate for dehydration and intra-molecular Diels-Alder cyclization by the Diels-Alderase pyiF to yield the required isoindolone-fused macrocycle (PubMed:32039410).
The tailoring cytochrome P450 monooxygenases piyD and piyG catalyze the hydroxylation at C-18 and C-7, respectivily, whereas the short-chain dehydrogenase/reductase pyiH reduces the carbonyl at C-21 in preparation for the transfer of an acetyl group by the acetyltransferase pyiB (PubMed:31099577).
These 3 reactions whose order is not clear yet, lead to the production of O-methylpyrichalasin J, a deacetylated pyrichalasin H (PubMed:31099577).
Finally, pyiB to converts O-methylpyrichalasin J into the final product pyrichalasin H via acetylation of C-21 (PubMed:31099577).
Pyrichalasin H is indicated as the responsible agent for the genus-specific pathogenicity of M.grisea toward crabgrass (PubMed:31099577).
The first step in the pathway is catalyzed by the O-methyltransferase pyiA which methylates free tyrosine to generate the precursor O-methyltyrosine (PubMed:31099577).
The hybrid PKS-NRPS pyiS, assisted by the enoyl reductase pyiC, are responsible for fusion of the O-methyltyrosine precursor and the polyketide backbone (PubMed:31099577).
The polyketide synthase module (PKS) of pyiS is responsible for the synthesis of the polyketide backbone and the downstream nonribosomal peptide synthetase (NRPS) amidates the carboxyl end of the polyketide with the O-methyltyrosine precursor (PubMed:31099577).
As the NRPS A-domain demonstrates substrate tolerance, pyiS can also use phenylalanine, tyrosine and even para-chlorophenylalanine as amino acid precursor, which leads to the production of novel cytochalasans, including halogenated cytochalasans (PubMed:31099577).
Because pyiS lacks a designated enoylreductase (ER) domain, the required activity is provided the enoyl reductase pyiC (PubMed:31099577).
Reduction by the hydrolyase pyiE leads to 1,5-dihydropyrrolone, which is substrate for dehydration and intra-molecular Diels-Alder cyclization by the Diels-Alderase pyiF to yield the required isoindolone-fused macrocycle (PubMed:32039410).
The tailoring cytochrome P450 monooxygenases piyD and piyG catalyze the hydroxylation at C-18 and C-7, respectivily, whereas the short-chain dehydrogenase/reductase pyiH reduces the carbonyl at C-21 in preparation for the transfer of an acetyl group by the acetyltransferase pyiB (PubMed:31099577).
These 3 reactions whose order is not clear yet, lead to the production of O-methylpyrichalasin J, a deacetylated pyrichalasin H (PubMed:31099577).
Finally, pyiB to converts O-methylpyrichalasin J into the final product pyrichalasin H via acetylation of C-21 (PubMed:31099577).
Pathway
Mycotoxin biosynthesis.
Features
Showing features for binding site, active site.
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | O-methyltransferase activity | |
Biological Process | methylation |
Keywords
- Molecular function
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameO-methyltransferase pyiA
- EC number
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageEukaryota > Fungi > Dikarya > Ascomycota > Pezizomycotina > Sordariomycetes > Sordariomycetidae > Magnaporthales > Pyriculariaceae > Pyricularia
Accessions
- Primary accessionA0A4P8WAD3
Proteomes
Phenotypes & Variants
Disruption phenotype
Leads to the loss of pyrichalasin H production, but accumulates the tyrosine and phenylalanine analogs of pyrichalasin H, called magnachalasin H and cytochalasin H.
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_0000449451 | 1-409 | O-methyltransferase pyiA | |||
Sequence: MASQDGTTELLSQSVNSTCIPGSTYHVDRGRASSASTPPTSPPLSEVDYTPLLESTQEPRHEYTQLAHSLVKAMADYVGHLQEENLPMPSLEPAAQVHGGLKVQGGVAARDTVVKLAQKIVAMTMDPEMKLFISSLQFHFCSSLKVAIDLRVHELDECFRASSRQADALALARYREPHEADTLGFGLAFNTTANFWEVLARDTEGKRSQRFNRAMRAVNINALEVIPRIYPFNRIGGNGLLVDVGGGLGQVARAIMATNQGSRLQRCIVQDVCAADDVLEEVLESNRKLGVELQRHDFFDKQPVTGASIYFFRHIFHDWPDRACVKILKQIVQAMGRDSRLLICDQVVDDEPSIPATLYDIDMWTLFGGKERNRSEWEALFRAADERLYIKKVWTTTEAPTTILEVCLW |
Structure
Family & Domains
Features
Showing features for compositional bias, region.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Compositional bias | 1-43 | Polar residues | ||||
Sequence: MASQDGTTELLSQSVNSTCIPGSTYHVDRGRASSASTPPTSPP | ||||||
Region | 1-46 | Disordered | ||||
Sequence: MASQDGTTELLSQSVNSTCIPGSTYHVDRGRASSASTPPTSPPLSE |
Sequence similarities
Belongs to the class I-like SAM-binding methyltransferase superfamily. Cation-independent O-methyltransferase family.
Family and domain databases
Sequence
- Sequence statusComplete
- Length409
- Mass (Da)45,694
- Last updated2019-07-31 v1
- Checksum9FB375240610AC9E
Features
Showing features for compositional bias.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Compositional bias | 1-43 | Polar residues | ||||
Sequence: MASQDGTTELLSQSVNSTCIPGSTYHVDRGRASSASTPPTSPP |
Keywords
- Technical term