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Aminosterols from the dogfish shark Squalus acanthias
M N Rao1, A E Shinnar, L A Noecker
1Magainin Pharmaceuticals, Inc., 5110 Campus Drive, Plymouth Meeting, Pennsylvania 19462, USA.
Journal of Natural Products
|June 8, 2000
Summary
Seven novel aminosterols were discovered in dogfish shark liver, with some showing significant antimicrobial properties. These compounds share structural similarities with squalamine, indicating potential therapeutic applications.
Area of Science:
- Marine natural products chemistry
- Medicinal chemistry
- Organic chemistry
Background:
- Dogfish shark liver is a known source of bioactive marine natural products.
- Squalamine, an aminosterol from Squalus acanthias, exhibits potent antimicrobial activity.
- Exploring novel compounds from marine organisms is crucial for drug discovery.
Purpose of the Study:
- To isolate and characterize new aminosterols from Squalus acanthias liver.
- To investigate the structural features of these novel compounds.
- To evaluate their potential antimicrobial activities.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation via 2D NMR and HRFABMS (High-Resolution Fast Atom Bombardment Mass Spectrometry).
- Chemical synthesis for structural confirmation of a specific compound.
Main Results:
- Seven new aminosterols (compounds 1-7) were identified.
- Structures feature a cholestane skeleton, spermidine/spermine at C3, and a potentially sulfated side chain.
- Compound 7 (MSI-1436) was synthesized and its structure confirmed.
- Several isolated aminosterols demonstrated broad-spectrum antimicrobial activity comparable to squalamine.
Conclusions:
- The study expands the known family of squalamine-related aminosterols.
- The identified compounds represent a new class of marine-derived antimicrobial agents.
- These findings highlight the potential of Squalus acanthias as a source for novel therapeutics.