Figure 2.
HPLC analysis (283 nm) of metabolites produced by wild type and mutant P. aethiopicum strains. The mutant ΔvrtA, ΔgsfA or ΔgsfI no longer produced 1, 2 or 3, respectively. Standards of compounds 1 and 2 are shown. The identity of 3 was established by NMR characterization. Peaks labeled with t have UV spectra and m/z values matching to 4 and can be isomers.