Configurational analysis of cyclopropyl fatty acids isolated from Escherichia coli
(Chemical Equation Presented) The absolute configuration of methyl lactobacillate and its 9,10 homologue, both isolated from Escherichia coli B-ATCC 11303, was found to be 11R,12S and 9R,10S, respectively.
Stuart, Laura J.,Buck, James P.,Tremblay, Amy E.,Buist, Peter H.
Ascaroside Signaling in the Bacterivorous Nematode Caenorhabditis remanei Encodes the Growth Phase of Its Bacterial Food Source
A novel class of species-specific modular ascarosides that integrate additional fatty acid building blocks was characterized in the nematode Caenorhabditis remanei using a combination of HPLC-ESI-(-)-MS/MS precursor ion scanning, microreactions, HR-MS/MS, MSn, and NMR techniques. The structure of the dominating component carrying a cyclopropyl fatty acid moiety was established by total synthesis. Biogenesis of this female-produced male attractant depends on cyclopropyl fatty acid synthase (cfa), which is expressed in bacteria upon entering their stationary phase.
Dolke, Franziska,Dong, Chuanfu,Bandi, Siva,Paetz, Christian,Glauser, Gaétan,Von Reu?, Stephan H.