Berberine bridge enzyme-like oxidase-catalysed double bond isomerization acts as the pathway switch in cytochalasin synthesis

Jin-Mei Zhang, Xuan Liu, Qian Wei, Chuanteng Ma, Dehai Li and Yi Zou ()
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Jin-Mei Zhang: Southwest University
Xuan Liu: Southwest University
Qian Wei: Southwest University
Chuanteng Ma: Ocean University of China
Dehai Li: Ocean University of China
Yi Zou: Southwest University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Cytochalasans (CYTs), as well as their polycyclic (pcCYTs) and polymerized (meCYTs) derivatives, constitute one of the largest families of fungal polyketide-nonribosomal peptide (PK-NRP) hybrid natural products. However, the mechanism of chemical conversion from mono-CYTs (moCYTs) to both pcCYTs and meCYTs remains unknown. Here, we show the first successful example of the reconstitution of the CYT core backbone as well as the whole pathway in a heterologous host. Importantly, we also describe the berberine bridge enzyme (BBE)-like oxidase AspoA, which uses Glu538 as a general acid biocatalyst to catalyse an unusual protonation-driven double bond isomerization reaction and acts as a switch to alter the native (for moCYTs) and nonenzymatic (for pcCYTs and meCYTs) pathways to synthesize aspochalasin family compounds. Our results present an unprecedented function of BBE-like enzymes and highly suggest that the isolated pcCYTs and meCYTs are most likely artificially derived products.

Date: 2022
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DOI: 10.1038/s41467-021-27931-z

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