Fig. 2: Structure of azalomycin F and its production by S. iranensis.

a Azalomycin F complex consists of azalomycins F3a and F4a. b MS analysis in positive mode of S. iranensis wild type (WT), S. iranensis mutants ∆azl4∆azl5 and ∆azlH. The mutants failed to produce azalomycin F and to decolorize C. reinhardtii in co-culture (pictures on the right side). Extracted Ion Chromatogram: m/z = 1068.65–1068.80.