COMPARISON OF THE MAIN SIDEROPHORES PRODUCED BY SOME SPECIES OF STREPTOMYCES

The production of siderophores by four Streptomyces strains, S. ambofa ciens, S. coelicolor, S. lividans, and S. viridosporus, was studied un der iron-limited conditions. S. viridosporus produced two different si derophores: the linear desferrioxamine B and the cyclic desferrioxamin e E. The latter was produced by the other strains and was the main sid erophore of S. ambofaciens. The linear desferrioxamine G was the major form of S. coelicolor and S. lividans. The uptake rates of Fe-55-labe led ferrioxamines by S. lividans and S. viridosporus showed that the G form was incorporated less efficiently than the B and E forms.