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submitted on 14.09.2018 and posted on 18.09.2018by Margarida Costa, Ivo E. Sampaio-Dias, Raquel Castelo-Branco, Hugo Scharfenstein, Roberta Rezende de Castro, Artur Silva, Maria Paula Cruz Schneider, Maria João Araújo, Rosário Martins, Valentina F. Domingues, Fatima Nogueira, Vera Camões, Vitor M. Vasconcelos, Pedro Leao
Small, single-celled planktonic cyanobacteria are ubiquitous in the world’s oceans yet tend not to to be perceived as biosynthetically-prolific organisms. Here we report the isolation and structure elucidation of hierridin C, an antiplasmodial halogenated alkylresorcinol produced in very low amounts by the picocyanobacterium Cyanobiumsp. LEGE 06113. We describe a simple, straightforward synthetic route to the scarcely-produced hierridins that relies on a key, highly regioselective halogenation step. In addition, we show that these compounds originate from a type III PKS pathway and that similar biosynthetic gene clusters are found in a variety of bacterial genomes, most notably those of the globally-distributed picocyanobacteria genera Prochlorococcus, Cyanobiumand Synechococcus.
The authors declare the following conflicts of interest: The antiplasmodial activity of hierridin C, one of the compounds reported herein, has formed the basis for of a patent application (WO2016207869), in which some of the authors are co-inventors.