The Multifaceted Gene 275 Embedded in the PKS-PTS Gene Cluster Was Involved in the Regulation of Arthrobotrisin Biosynthesis, TCA Cycle, and Septa Formation in Nematode-Trapping Fungus .

The predominant nematode-trapping fungus harbors a unique polyketide synthase-prenyltransferase (PKS-PTS) gene cluster responsible for the biosynthesis of sesquiterpenyl epoxy-cyclohexenoids (SECs) that are involved in the regulation of fungal growth, adhesive trap formation, antibacterial activity, and soil colonization. However, the function of one rare gene ( ()) embedded in the cluster has remained cryptic. Here, we constructed two mutants with the disruption of and the overexpression of , respectively, and compared their fungal growth, morphology, resistance to chemical stress, nematicidal activity, transcriptomic and metabolic profiles, and infrastructures, together with binding affinity analysis.

Acetylation of Sesquiterpenyl Epoxy-Cyclohexenoids Regulates Fungal Growth, Stress Resistance, Endocytosis, and Pathogenicity of Nematode-Trapping Fungus via Metabolism and Transcription.

Sesquiterpenyl epoxy-cyclohexenoids (SECs) that depend on a polyketide synthase-terpenoid synthase (PKS-TPS) pathway are widely distributed in plant pathogenic fungi. However, the biosynthesis and function of the acetylated SECs still remained cryptic. Here, we identified that 00215 273 (273) was responsible for the acetylation of SECs in via the construction of Δ273, in which the acetylated SECs were absent and major antibacterial nonacetylated SECs accumulated.