Genome-Guided Metabolomic Profiling of Peptaibol-Producing Trichoderma

Area of Science:

• Mycology
• Biochemistry
• Genomics

Background:

• Peptaibols are fungal peptides with antibacterial and antiplasmodial properties.
• Detailed biosynthetic pathways for peptaibols are not well understood.
• Trichoderma fungi are known producers of bioactive compounds.

Purpose of the Study:

• To investigate the biosynthesis of peptaibols in Trichoderma sp. SK1-7.
• To identify novel peptaibols and their producing gene clusters.
• To explore the potential of peptaibols as antibiotic adjuvants.

Main Methods:

• Genome-guided analysis of Trichoderma sp. SK1-7.
• Structure elucidation using MS, NMR, and advanced Marfey's method.
• Feeding experiments to study amino acid incorporation.

Main Results:

• Identification of trichorozin IV and a novel SF4-type peptaibol, trichorozin V.
• Discovery of two PKS-NRPS hybrid gene clusters potentially responsible for trichorozin synthesis.
• Demonstration that peptaibol production is influenced by the ratio of isovaline (Iva) to α-aminoisobutyric acid (Aib).

Conclusions:

• Genome-guided approaches are effective for discovering fungal secondary metabolites.
• Trichorozins are likely synthesized via a module skipping mechanism.
• The identified peptaibols show potential as antibiotic adjuvants, particularly in combination therapies.