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Partial structure elucidation of flavopeptins by MS and tandem MS. (a) Two isobaric structures of flavopeptin with mass 856.5 Da, with the observed MS2 fragments shown. (b) Metabolic labeling of flavopeptins with amino acid precursors containing stable isotopes. Shown are the mass spectra for flavopeptins from F-6652 grown in MSB medium with no labeling and with13C6-isoleucine, 2,3,3,4,4-d5-glutamine, ring-d5 phenylalanine,13C5,15N-valine and d10-leucine.
