Liquid chromatography-mass spectrometry characterization of FK506 biosynthetic intermediates in Streptomyces clavuligerus KCTC 10561BP.
The development of an efficient analytical method for the reliable detection and identification of the biosynthetic intermediates found in microbial cultures, which usually produce complex intermediates of the metabolites of interest, is essential for further biosynthetic investigations. This study developed a simple and highly selective method for detecting the biosynthetic intermediates involved in the FK506 pathway of Streptomyces clavuligerus KCTC 10561BP involving a cleanup procedure using a solid-phase extraction technique to provide reliable extraction of FK506-related compounds from a cell culture broth and liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) to separate and detect the FK506-related intermediates at concentrations as low as 0.2 microg/L in the broth. This method enabled the analytical profiling of the intermediates formed during the biosynthesis of FK506 in this S. clavuligerus strain, which produced FK506 as a main product. Eight FK506 intermediates--FK520, 37,38-dihydroFK506, prolylFK506, 9-decarbonyl-9-hydroxylFK506, 9-deoxoFK506, desmethylFK520, prolylFK520, and 9-deoxoFK520--were identified. This is the first report of the LC-ESI-MS/MS characterization of a wide range of FK506 analogs from a bacterial fermentation broth. The protocol employed in this study may be useful for estimating the structure of the metabolites without the need for a time-consuming isolation process and nuclear magnetic resonance (NMR) spectroscopy.
Park
Je Won
JW
Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea.
Mo
Sang-Joon
SJ
Park
Sung Ryeol
SR
Ban
Yeon-Hee
YH
Yoo
Young Ji
YJ
Yoon
Yeo Joon
YJ
D002853:Chromatography, Liquid / Q000379:methods*; D015394:Molecular Structure; D052616:Solid Phase Extraction; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013302:Streptomyces / Q000737:chemistry* / Q000378:metabolism*; D016559:Tacrolimus / Q000031:analogs & derivatives* / Q000032:analysis / Q000378:metabolism*; D053719:Tandem Mass Spectrometry / Q000379:methods*
D016559:Tacrolimus