A team of researchers announced on Apr. 8 the discovery of a rare cancer-fighting molecule, jorumycidine, found in the symbiotic relationship between a sea slug and its sponge prey. The study, published in Communications Chemistry, highlights the unique six-ring structure of this marine-derived alkaloid and its potential for inspiring more stable anticancer drug designs.
The discovery matters because many existing anticancer drugs are inspired by natural compounds, with marine environments offering promising new candidates through interactions among ocean species. Jorumycidine was isolated from specimens of the dotted nudibranch (Jorunna funebris) and its associated blue-grey tube sponge (Haliclona species), collected off Koh Tao Island in southern Thailand.
Researchers extracted and purified compounds using organic solvents followed by advanced chromatography techniques. They characterized these molecules through nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry to determine their composition and structure. Bioinformatic analysis revealed that the biosynthetic gene cluster responsible for producing these compounds is a hybrid system that facilitates key steps such as cyclization.
The newly identified jorumycidine features an unprecedented hexacyclic framework with an additional oxazolidine ring not seen before in similar molecules. Spectroscopic analysis confirmed two quinone rings along with multiple functional groups important for biological activity. Testing showed that jorumycidine demonstrated strong cytotoxic effects against several cancer cell lines—most notably multiple myeloma—with a half-maximal inhibitory concentration of 13.8 nanomolar.
The study also found evidence suggesting chemical or enzymatic modification occurs after the mollusk ingests compounds from its sponge prey, although alternative explanations could not be ruled out. Stereochemical studies confirmed both relative and absolute stereochemistry critical to biological function.
According to researchers, "This study highlights the discovery of jorumycidine, a structurally unique marine-derived alkaloid with strong anticancer potential." They concluded that jorumycidine's stability and potency make it a promising scaffold for future drug development efforts targeting cancer.
