Methyl-branched fatty acids, inhibitors of enoyl-ACP reductase with antibacterial activity from Streptomyces sp. A251.
Bacterial enoyl-ACP reductase (FabI) has been demonstrated to be a novel antibacterial target. In the course of our screening for FabI inhibitors we isolated two methyl-branched fatty acids from Streptomyces sp. A251. They were identified as 14-methyl-9(Z)-pentadecenoic acid and 15-methyl-9(Z)-hexadecenoic acid by MS and NMR spectral data. These compounds inhibited Staphylococcus aureus FabI with IC50 of 16.0 and 16.3mu M, respectively, while didn't affect FabK, an enoyl-ACP reductase of Streptococcus pneumonia, at 100muM. Consistent with their selective inhibition for FabI, they blocked intracellular fatty acid synthesis as well as the growth of S. aureus, while didn't inhibit the growth of S. pneumonia. Additionally, these compounds showed reduced antibacterial activity against fabI-overexpressing S. aureus compared to the wild-type strain. These results demonstrate that the methyl-branched fatty acids showed antibacterial activity by inhibiting FabI in vivo.
Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea.
Chang-Ji
CJ
Zheng
Mi-Jin
MJ
Sohn
Seung-Wook
SW
Chi
Won-Gon
WG
Kim
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH) / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D007700:Kinetics; D013210:Staphylococcus / Q000737:chemistry / Q000187:drug effects / Q000201:enzymology*; D013302:Streptomyces / Q000737:chemistry / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D004791:Enzyme Inhibitors; D005227:Fatty Acids; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH)