[Study on metabolites from a sponge-derived fungus]

Area of Science:

• Marine Natural Product Chemistry
• Fungal Metabolomics
• Organic Chemistry

Background:

• Marine-derived fungi are a rich source of novel bioactive compounds.
• Emericella variecolor, isolated from the South China Sea, represents an underexplored fungal species.
• Understanding fungal chemical diversity is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize new chemical constituents from the sponge-derived fungus Emericella variecolor.
• To investigate the chemical diversity of marine-derived fungi.
• To determine the structures of novel compounds using advanced spectroscopic techniques.

Main Methods:

• Isolation of compounds using column chromatography over silica gel, Sephadex LH-20, and ODS.
• Structure elucidation of new compounds employing Nuclear Magnetic Resonance (NMR) spectroscopy, High-Resolution Electrospray Ionization Mass Spectrometry (HR-ESI-MS), and Circular Dichroism (CD).
• Identification of known compounds including anditomin, andilesin A, andilesin C, and andilesin B.

Main Results:

• Two new chemical constituents, (+)-2-acetyl-dihydroterrein and (+)-3-acetyl-dihydroterrein, were isolated and identified.
• Four known compounds (anditomin, andilesin A, andilesin C, and andilesin B) were also obtained.
• The structures of the novel compounds were fully elucidated using comprehensive spectroscopic data.

Conclusions:

• The marine fungus Emericella variecolor produces unique acetyl-dihydroterrein derivatives.
• This study contributes to the knowledge of secondary metabolites from marine-derived fungi.
• The identified compounds may serve as leads for future pharmacological investigations.