| IED ID | IndEnz0015000130 |
| Enzyme Type ID | laccase000130 |
| Protein Name |
Multicopper oxidase VdtB EC 1.-.-.- Laccase vdtA Viriditoxin biosynthesis cluster protein B |
| Gene Name | VdtB C8Q69DRAFT_480050 |
| Organism | Byssochlamys spectabilis (Paecilomyces variotii) |
| Taxonomic Lineage | cellular organisms Eukaryota Opisthokonta Fungi Dikarya Ascomycota saccharomyceta Pezizomycotina leotiomyceta Eurotiomycetes Eurotiomycetidae Eurotiales (green and blue molds) Thermoascaceae Paecilomyces Byssochlamys spectabilis (Paecilomyces variotii) |
| Enzyme Sequence | MPAYLLLLACNVLLVLGAHVQRELVLTWEEGAPNGQSRQMIKTNGQFPSPTLIFDEGDDVEIVVRNYMHENTTIHWHGILMQDTPWSDGVPGLSQKPIEPGESYVYRFTAYPPGQYWYHSHSRATLLDGLYGALFIRRKPGTAGPWAMISEDPEDIAAMERASNNPHIMMLSDWDYYNSTQYKEADANSRLQIFCVDSILLNGKGSVYCPGHQWLIDKQIPFMHKSWPNDTITDKGCFPFVPSTEGPWLADGNVSAIPPGLQEGCVPYSGPTEAIEVDPADRWASVNWIGGSTFKTLQPTIDEHEMWIYEVDGHYIEPRRADTFLIWAGERYSAMIRLDKKPMDYSIRVPDGGYSQMIAAFGILRYKNGDPNARQKPDRFGVTTISKPYFDYNAWPMRDAVFLDKLDLPPWPRKVPAAHGDDMHVLYLGKANSTWEFTLSGKKKYPPDRSAYEPLLYNVNSEQAHDDDLIIRTQNGTWQDIVLQVGHSPLWPVDFPHAVHKHANKYWRIGGGQGLWNYSSVEEAMADQPESFNMVNPPYRDTFLTEFTGAMWVVLRYQVTSPGAWLLHCHFEMHLDNGMAMAILDGVDKWPHVPPEYTQGFHGFREHELPGPAGFWGLVSKILRPESLVWAGGAAVVLLSLFIGGLWRLWQRRMQGTYYVLSQEDERDRFSMDKEAWKSEETKRM |
| Enzyme Length | 685 |
| Uniprot Accession Number | A0A443HK79 |
| Absorption | |
| Active Site | |
| Activity Regulation | |
| Binding Site | |
| Calcium Binding | |
| catalytic Activity | CATALYTIC ACTIVITY: Reaction=O2 + 4 semiviriditoxin = 2 (M)-viriditoxin + 2 H2O; Xref=Rhea:RHEA:62884, ChEBI:CHEBI:15377, ChEBI:CHEBI:15379, ChEBI:CHEBI:146007, ChEBI:CHEBI:146008; Evidence={ECO:0000269|PubMed:31045362};PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:62885; Evidence={ECO:0000269|PubMed:31045362}; |
| DNA Binding | |
| EC Number | 1.-.-.- |
| Enzyme Function | FUNCTION: Multicopper oxidase; part of the gene cluster that mediates the biosynthesis of viriditoxin, one of the 'classical' secondary metabolites produced by fungi and that has antibacterial activity (PubMed:31304040, PubMed:31045362). The first step is performed by the polyketide synthase VdtA which condenses one acetyl-CoA and 6 malonyl-CoA units to form the heptaketide monomer backbone of viriditoxin (PubMed:31304040). The product of VdtA is then O-methylated on C7 by the O-methyltransferase VdtC (PubMed:31304040, PubMed:31045362). The O-methyl group is important for the stereoselective coupling of the monomers at the final step of viriditoxin biosynthesis (PubMed:31304040, PubMed:31045362). The short-chain dehydrogenase/reductase VdtF then acts as a stereospecific reductase converting the pyrone to dihydropyrone via the reduction of the C3-C4 double bond (PubMed:31304040, PubMed:31045362). The FAD-binding monooxygenase VdtE then converts the ketone group into a methyl-ester group to yield semi-viriditoxin (PubMed:31304040, PubMed:31045362). Finally, the laccase VdtB is involved in dimerization of 2 semi-viriditoxin molecules to yield the final viriditoxin (PubMed:31304040, PubMed:31045362). VdtB is responsible for the regioselective 6,6'-coupling of semi-viriditoxin, which yields (M)-viriditoxin and (P)-viriditoxin at a ratio of 1:2 (PubMed:31304040, PubMed:31045362). The non-catalytic carboxylesterase-like protein VdtD affects the stereochemistical outcome of the coupling (PubMed:31304040, PubMed:31045362). The highly reducing polyketide synthase VdtX is not involved in viriditoxin synthesis, but might possibly play a role in the production of additional metabolites not identified yet (PubMed:31304040, PubMed:31045362). {ECO:0000269|PubMed:31045362, ECO:0000269|PubMed:31304040}. |
| Temperature Dependency | |
| PH Dependency | |
| Pathway | PATHWAY: Secondary metabolite biosynthesis. {ECO:0000269|PubMed:31045362, ECO:0000269|PubMed:31304040}. |
| nucleotide Binding | |
| Features | Chain (1); Domain (3); Glycosylation (7); Metal binding (5); Signal peptide (1); Transmembrane (1) |
| Keywords | Copper;Glycoprotein;Membrane;Metal-binding;Oxidoreductase;Reference proteome;Repeat;Signal;Transmembrane;Transmembrane helix |
| Interact With | |
| Induction | |
| Subcellular Location | SUBCELLULAR LOCATION: Membrane {ECO:0000255}; Single-pass membrane protein {ECO:0000255}. |
| Modified Residue | |
| Post Translational Modification | |
| Signal Peptide | SIGNAL 1..17; /evidence=ECO:0000255 |
| Structure 3D | |
| Cross Reference PDB | - |
| Mapped Pubmed ID | - |
| Motif | |
| Gene Encoded By | |
| Mass | 78,142 |
| Kinetics | |
| Metal Binding | METAL 75; /note=Copper 1; /evidence=ECO:0000250|UniProtKB:Q70KY3; METAL 77; /note=Copper 2; /evidence=ECO:0000250|UniProtKB:Q70KY3; METAL 119; /note=Copper 2; /evidence=ECO:0000250|UniProtKB:Q70KY3; METAL 121; /note=Copper 3; /evidence=ECO:0000250|UniProtKB:Q70KY3; METAL 500; /note=Copper 4; /evidence=ECO:0000250|UniProtKB:Q70KY3 |
| Rhea ID | RHEA:62884; RHEA:62885 |
| Cross Reference Brenda |