Protein: Multicopper oxidase VdtB (A0A443HK79)
Organism: Byssochlamys spectabilis (Paecilomyces variotii)
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. 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. The product of VdtA is then O-methylated on C7 by the O-methyltransferase VdtC. The O- methyl group is important for the stereoselective coupling of the monomers at the final step of viriditoxin biosynthesis. 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. The FAD-binding monooxygenase VdtE then converts the ketone group into a methyl-ester group to yield semi-viriditoxin. Finally, the laccase VdtB is involved in dimerization of 2 semi- viriditoxin molecules to yield the final viriditoxin. 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. The non-catalytic carboxylesterase-like protein VdtD affects the stereochemistical outcome of the coupling. 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
Subcellular location: Membrane; Single-pass membrane protein
Sequence: MPAYLLLLACNVLLVLGAHVQRELVLTWEEGAPNGQSRQMIKTNGQFPSPTLIFDEGDDVEIVVRNYMHENTTIHWHGILMQDTPWSDGVPGLSQKPIEPGESYVYRFTAYPPGQYWYHSHSRATLLDGLYGALFIRRKPGTAGPWAMISEDPEDIAAMERASNNPHIMMLSDWDYYNSTQYKEADANSRLQIFCVDSILLNGKGSVYCPGHQWLIDKQIPFMHKSWPNDTITDKGCFPFVPSTEGPWLADGNVSAIPPGLQEGCVPYSGPTEAIEVDPADRWASVNWIGGSTFKTLQPTIDEHEMWIYEVDGHYIEPRRADTFLIWAGERYSAMIRLDKKPMDYSIRVPDGGYSQMIAAFGILRYKNGDPNARQKPDRFGVTTISKPYFDYNAWPMRDAVFLDKLDLPPWPRKVPAAHGDDMHVLYLGKANSTWEFTLSGKKKYPPDRSAYEPLLYNVNSEQAHDDDLIIRTQNGTWQDIVLQVGHSPLWPVDFPHAVHKHANKYWRIGGGQGLWNYSSVEEAMADQPESFNMVNPPYRDTFLTEFTGAMWVVLRYQVTSPGAWLLHCHFEMHLDNGMAMAILDGVDKWPHVPPEYTQGFHGFREHELPGPAGFWGLVSKILRPESLVWAGGAAVVLLSLFIGGLWRLWQRRMQGTYYVLSQEDERDRFSMDKEAWKSEETKRM
InterPro domains: - IPR008972: Cupredoxin (homologous_superfamily) [14-607]
- IPR011707: Multicopper oxidase-like, N-terminal (domain) [27-139]
- IPR045087: Multicopper oxidase (family) [37-587]
- IPR001117: Multicopper oxidase, second cupredoxin domain (domain) [168-368]
- IPR011706: Multicopper oxidase, C-terminal (domain) [455-585]
- IPR033138: Multicopper oxidases, conserved site (conserved_site) [114-583]
- IPR002355: Multicopper oxidase, copper-binding site (binding_site) [568-579]
Interaction partners: - Nitrate reductase
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0016491 (oxidoreductase activity), GO:0016679 (oxidoreductase activity, acting on diphenols and related substances as donors), GO:0016682 (oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0019748 (secondary metabolic process), GO:0071704 (organic substance metabolic process), GO:0044281 (small molecule metabolic process), GO:0044550 (secondary metabolite biosynthetic process), GO:1901615 (organic hydroxy compound metabolic process), GO:0044249 (cellular biosynthetic process), GO:0009404 (toxin metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0006725 (cellular aromatic compound metabolic process), GO:0018904 (ether metabolic process), GO:0030638 (polyketide metabolic process), GO:1901617 (organic hydroxy compound biosynthetic process), GO:1901503 (ether biosynthetic process), GO:1901362 (organic cyclic compound biosynthetic process), GO:0043385 (mycotoxin metabolic process), GO:0009403 (toxin biosynthetic process), GO:0019438 (aromatic compound biosynthetic process), GO:0030639 (polyketide biosynthetic process), GO:0018958 (phenol-containing compound metabolic process), GO:0043386 (mycotoxin biosynthetic process), GO:0046189 (phenol-containing compound biosynthetic process)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0016020 (membrane), GO:0005737 (cytoplasm), GO:0005773 (vacuole), GO:0031090 (organelle membrane), GO:0043229 (intracellular organelle), GO:0043227 (membrane-bounded organelle), GO:0000325 (plant-type vacuole), GO:0043231 (intracellular membrane-bounded organelle), GO:0005774 (vacuolar membrane), GO:0098588 (bounding membrane of organelle), GO:0000322 (storage vacuole), GO:0000324 (fungal-type vacuole), GO:0098852 (lytic vacuole membrane), GO:0000329 (fungal-type vacuole membrane)