A Fungal N-Dimethylallyltryptophan Metabolite from Fusarium fujikuroi

Area of Science:

• Mycology
• Natural Product Chemistry
• Biochemistry

Background:

• Fusarium fujikuroi, a rice pathogen, produces a diverse array of secondary metabolites (SMs).
• While polyketides, nonribosomal peptides, and terpenes are known, products from dimethylallyltryptophan synthases (DMATSs) remained uncharacterized despite the presence of putative DMATS genes.
• Investigating these uncharacterized pathways is crucial for understanding fungal metabolism and potential bioactivity.

Purpose of the Study:

• To elucidate the in vivo products of dimethylallyltryptophan synthases (DMATSs) in Fusarium fujikuroi.
• To characterize the structure and biosynthetic origin of novel secondary metabolites derived from DMATS activity.
• To explore the potential influence of adjacent genes on DMATS-derived product formation.

Main Methods:

• Utilized MZmine 2 software for the identification of in vivo products from F. fujikuroi.
• Performed detailed structure elucidation of the identified metabolites.
• Analyzed genes located adjacent to the DMATS1 gene to assess their role in biosynthesis.

Main Results:

• Identified a novel metabolite as a reversely N-prenylated tryptophan, featuring a rare prenylation pattern.
• Detected additional products likely arising from side reactions catalyzed by DMATS1.
• Analysis of adjacent genes indicated no significant influence on the biosynthesis of the identified DMATS1 product.

Conclusions:

• The study successfully identified a novel secondary metabolite class derived from DMATS1 in F. fujikuroi.
• The findings expand the known repertoire of fungal secondary metabolites and highlight unusual prenylation mechanisms.
• Further research is warranted to explore the biological significance and potential applications of these novel compounds.