Lipid metabolism inhibitors of microbial origin.
Thiotetromycin is isolated from Streptomyces sp. OM-674 discovered in the course of the screening for antibacterial antibiotics. The antibiotic was found to be a specific inhibitor of type II fatty acid synthase. In order to search acyl-CoA synthetase inhibitors, a kind of yeast, Candida lipolytica, was utilized as test organism for the primary screening. Four structurally related compounds named triacsin were isolated from Streptomyces sp. SK-1894 as a specific inhibitor of acyl-CoA synthetase I of C. lipolytica. Further biochemical studies revealed that triacsins inhibit acyl-CoA synthetases from widely different sources. The inhibition is competitive with respect to long chain fatty acids. The common N-hydroxytriazene moiety of triacsins is essential for inhibition. To discover inhibitors of mevalonate biosynthesis, Vero cells were used as test organism for the screening. A beta-lactone 1233A(F-244) isolated from Scopulariopsis sp. F-244 was demonstrated to inhibit mevalonate biosynthesis with assays using cell and enzyme systems. Further studies demonstrated that the compound inhibits 3-hydroxy-3-methylglutaryl (HMG)-CoA synthase specifically and irreversibly. The geometry of the (2R, 3R)-beta-lactone ring in the structure is essential for specific inhibition against the enzyme.
Research Center for Biological Function, Kitasato Institute, Tokyo, Japan.
H
H
Tomoda
S
S
Omura
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D003066:Coenzyme A Ligases / Q000037:antagonists & inhibitors*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005227:Fatty Acids / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D006904:Hydroxymethylglutaryl-CoA Synthase / Q000037:antagonists & inhibitors*; D007783:Lactones / Q000494:pharmacology*; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D014226:Triazenes / Q000494:pharmacology*; D000098859:Long-Chain-Fatty-Acid-CoA Ligase
D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D007783:Lactones; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D014226:Triazenes; C054282:antibiotic 1233A; C034613:triacsin C; D006904:Hydroxymethylglutaryl-CoA Synthase; D003066:Coenzyme A Ligases; C090799:FAA2 protein, S cerevisiae; D000098859:Long-Chain-Fatty-Acid-CoA Ligase