%0 Journal Article %A Heuck, Dagmar %A Beer, W. %A Reissbrodt, R. %T Iron supply of staphylococci and of micrococci by α-ketoacids %D 1995 %J Journal of Medical Microbiology, %V 43 %N 1 %P 26-32 %@ 1473-5644 %R https://doi.org/10.1099/00222615-43-1-26 %I Microbiology Society, %X Summary Most of 232 strains of coagulase-negative staphylococci (CNS) belonging to 16 species, and nine strains of micrococci belonging to four species, could be distinguished by their growth on an iron-poor nutrient medium. α-Keto-/α-hydroxyacids, as primary metabolites, facilitated iron supply to CNS and micrococci under various iron-limited conditions, as detected by different bioassay methods. Twelve selected CNS strains and two micrococcal strains produced significant amounts of α-ketoacids in iron-poor liquid nutrient media. In particular, strains of Staphylococcus cohnii, S. xylosus and S. lentus unable to grow on iron-poor media, produced high amounts of pyruvic acid and α-ketoglutaric acid. In bioassays, the selected CNS strains being siderophore indicator strains were fed with α-ketoacids at different levels of iron limitation. Strains able to grow under iron deprivation appeared to produce additional siderophores such as staphyloferrins under iron stress, α-Keto-/α-hydroxyacids may be additionally active in the iron supply of CNS and micrococci. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/00222615-43-1-26