title: Manganese transport in Brevibacterium ammoniagenes ATCC 6872.
abstract: Uptake of manganese by Brevibacterium ammoniagenes ATCC 6872 was energy dependent and obeyed saturation kinetics (Km = 0.65 microM; Vmax = 0.12 mumol/min per g [dry weight]). Uptake showed optima at 27 degrees C and pH 9.5. 54Mn2+ accumulated by the cells was released by treatment with toluene or by exchange for unlabeled manganese ions, via an energy-dependent process. Co2+, Fe2+, Cd2+, and Zn2+ inhibited manganese uptake. Inhibition by Cd2+ and Zn2+ was competitive (Ki = 0.15 microM Cd2+ and 1.2 microM Zn2+). Experiments with 65Zn2+ provided no evidence for Zn2+ uptake via the Mn2+ transport system.
mesh_terms: D001693:Biological Transport, Active; D001951:Brevibacterium / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008345:Manganese / Q000378:metabolism*; D013696:Temperature
chemical_list: D008345:Manganese