Add time:08/27/2019         Source:sciencedirect.com

Palytoxin (PTX) has been widely studied owing to its outstanding toxic properties and complex structural features. It is a great challenge to identify and isolate analogues of PTX from various organisms and reveal their physiological activities. We previously reported the isolation of PTX as an insecticidal compound from the red alga, Chondria armata. In this study, we investigate another active compound from C. armata, which has similar toxicity and chromatographic behavior as PTX. Our detailed structural analysis reveals that this compound is palytoxin carboxylic acid. We characterized its physicochemical properties and conducted extensive NMR studies. This analogue has a structure devoid of the terminus of PTX, such that its presence in the alga implies the role of symbiotic microorganisms in marine ecosystems.

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