Cerulenin ((2R,3S)-2,3-epoxy-4-oxo-7,10-trans, trans-dodecadienoylamide) is an antifungal antibiotic isolated from Cephalosporium caerulens, that inhibits eukaryotic lipid and sterol synthesis and blocks lipid modification of proteins. Cerulenin is a potent inhibitor of fatty acid synthase (FAS). It inhibits all known types of FASs: both multifunctional enzyme complexes (Type I) (from yeast, rat liver, mammalian cells, and certain bacteria) and unassociated enzymes (Type II) (from most bacteria, and higher plants). Cerulenin blocks the synthesis of polyketides in a wide variety of organisms, including actinomycetes, fungi, and higher plants. In addition, cerulenin is suggested to inhibit the condensation step in polyketide synthesis as well as fatty acid synthesis. Cerulenin has a wide range of antimicrobial activity, the drug significantly inhibits the growth of yeast-like fungi, such as Candida, Saccharomyces, and Cryptococcus. Cerulenin is commercially available as a biochemical reagent for widespread use in the field of obesity, cancer biology, posttranslational protein modification system, drug discovery research and so on.