A Mushroom P450‐Monooxygenase Enables Regio‐ and Stereoselective Biocatalytic Synthesis of Epoxycyclohexenones

An epoxycyclohexenone (ECH) moiety occurs in natural products of both bacteria and ascomycete and basidiomycete fungi. While the enzymes for ECH formation in bacteria and ascomycetes have been identified and characterized, it remained obscure how this structure is biosynthesized in basidiomycetes. I...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-12, Vol.62 (49), p.e202313817-n/a
Main Authors: Yang, Yan‐Long, Zhou, Man, Yang, Lin, Gressler, Markus, Rassbach, Johannes, Wurlitzer, Jacob M., Zeng, Ying, Gao, Kun, Hoffmeister, Dirk
Format: Article
Language:English
Subjects:
Agaricales - metabolism
Ascomycota
Ascomycota - metabolism
Bacteria
Bacteria - metabolism
Basidiocarps
Basidiomycota - genetics
Biocatalysis
Biosynthesis
Cytochrome P-450 Enzyme System - metabolism
Cytochrome P450
Cytochromes P450
Enzymes
Epoxycyclohexenone
Homology
Molecular dynamics
Mushrooms
Natural Products
Stereoselectivity
Substrate Specificity
Substrates
Yeasts
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Summary:An epoxycyclohexenone (ECH) moiety occurs in natural products of both bacteria and ascomycete and basidiomycete fungi. While the enzymes for ECH formation in bacteria and ascomycetes have been identified and characterized, it remained obscure how this structure is biosynthesized in basidiomycetes. In this study, we i) identified a genetic locus responsible for panepoxydone biosynthesis in the basidiomycete mushroom Panus rudis and ii) biochemically characterized PanH, the cytochrome P450 enzyme catalyzing epoxide formation in this pathway. Using a PanH‐producing yeast as a biocatalyst, we synthesized a small library of bioactive ECH compounds as a proof of concept. Furthermore, homology modeling, molecular dynamics simulation, and site directed mutation revealed the substrate specificity of PanH. Remarkably, PanH is unrelated to ECH‐forming enzymes in bacteria and ascomycetes, suggesting that mushrooms evolved this biosynthetic capacity convergently and independently of other organisms. PanH, a cytochrome P450 monooxygenase, was identified and verified as the enzyme responsible for epoxycyclohexenone formation in panepoxydone biosynthesis in the basidiomycete mushroom Panus rudis. A PanH‐producing yeast as a biocatalyst enabled an enzymatic approach to synthesize a library of bioactive epoxycyclohexenone compounds.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202313817