Highly Functionalized Spirobisnaphthalenes from Roussoella sp. KT4147

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Mycology

Background:

• Fungi are a prolific source of structurally diverse secondary metabolites with potential biological activities.
• The genus Roussoella has yielded various bioactive compounds, warranting further investigation.

Purpose of the Study:

• To isolate and characterize novel compounds from Roussoella sp. KT4147.
• To elucidate the structures and biosynthetic pathways of new natural products.
• To evaluate the cytotoxic potential of isolated compounds against cancer cell lines.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation through spectroscopic methods (NMR, MS).
• Biosynthetic pathway analysis based on structural features and known reactions.

Main Results:

• Isolation of highly functionalized spirobisnaphthalenes, preussomerins N (1) and O (2), and 16 known congeners.
• Structural determination revealed preussomerin N as a nitrogen-linked dimer of preussomerin G, and preussomerin O as a derivative of preussomerin G with a macommelin substructure.
• Compounds 1 and 2 exhibited potent cytotoxicity against COLO-201 human colorectal cancer cells.

Conclusions:

• Preussomerins N and O represent novel structural classes of spirobisnaphthalenes.
• Proposed biosynthetic pathways involve Michael-type addition and Diels-Alder cycloaddition reactions.
• The isolated compounds hold promise as potential leads for anticancer drug development.