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Protoporphyrin IX is an intermediate molecule in the heme biosynthetic pathway. Intra- and extracellular concentrations of protoporphyrin IX in the wild type strain, Myxococcus xanthus DK1622 were measured by reverse phase HPLC. The amount of intracellular protoporphyrin IX continuously increased and reached 6.4 picomoles/mg of protein at the stationary phase. Extracellular protoporphyrin IX began to be detected from the mid-exponential phase. The culture supernatant that was collected in the stationary phase contained approximately 3.0 picomoles of protoporphyrin IX per mg of protein. Spores formed by nutrient depletion contained about 6.5 picomole protoporphyrin IX/mg of protein. The synthesis of protoporphyrin IX and cell growth were strongly inhibited by addition of succinylacetone to a final concentration of 500 μM. Succinylacetone, however did not appear to interfere developmental processes. Normal developmental behaviors including aggregation and spore formation was achieved even if succinylacetone was added in a medium. Photolysis among cells grown on a starvation medium supplemented with succinylacetone was also observed. These results indicate that protoporphyrin IX may be important to M. xanthus vegetative growth, but not critical to development processes.
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UCI(KEPA) : I410-ECN-0101-2009-470-014220914