Meroterpenthiazole A, a unique meroterpenoid from the deep-sea-derived Penicillium allii-sativi, significantly inhibited retinoid X receptor (RXR)-α transcriptional effect

A novel meroterpenoid, named meroterpenthiazole A (1), was isolated from the deep-sea-derived Penicillium allii-sativi. Its structure was established by extensive spectroscopic and computational methods. Meroterpenthiazole A bears a rare benzothiazole moiety in nature. Compound 1 significantly inhibited retinoid X receptor (RXR)-α transcriptional effect (KD = 12.3 µmol/L) through a novel binding mechanism.