Cytotoxic Peptaibols from Trichoderma strigosum

Area of Science:

• Natural Products Chemistry
• Medicinal Chemistry
• Biochemistry

Background:

• Trichoderma species are known sources of bioactive secondary metabolites.
• Peptaibols are a class of peptides with diverse biological activities, including antimicrobial and cytotoxic properties.

Purpose of the Study:

• To isolate and characterize novel peptaibols from Trichoderma strigosum.
• To evaluate the cytotoxic activity of the isolated compounds against a panel of human cancer cell lines.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation using 1D/2D NMR and UPLC-MS/MS.
• Determination of absolute configurations via Marfey's method and GITC derivatization.
• Circular dichroism (CD) spectroscopy for conformational analysis.
• In vitro cytotoxicity assays against human cancer cell lines (MDA-MB-231, SNU449, SKOV3, DU145, HCT116).

Main Results:

• Five new lipopeptaibols (1-5) and eight new 19-residue peptaibols (8-15) were isolated.
• Structures and absolute configurations of new peptaibols were fully elucidated.
• Compounds 9, 10, 12, and 15 exhibited potent cytotoxicity against tested cancer cell lines.
• 19-residue peptaibols generally showed higher potency than lipopeptaibols.

Conclusions:

• Trichoderma strigosum is a rich source of structurally diverse peptaibols.
• Novel peptaibols possess significant cytotoxic potential, warranting further investigation for cancer therapy.
• Specific structural features, such as 19-residue length, correlate with enhanced anticancer activity.