SPI, antibiotic TA and globomycin target SPII and are bacteriocidal at
low concentrations.152 One feature of potential interest is that
arylomycins synergize with aminoglycosides150 while actinocarbasins
and krisynomycin do so with b-lactams.151 These natural products
may therefore serve as starting points for further semisynthetic
modifications of the frameworks through synthesis156,158–161 and
pathway engineering,155,162–166 with an eye towards combination
therapy