[Selective permeability of bacterial membranes for monovalent thallium ions].
Transport of monovalent thallium ions in bacterial cells was studied. An energy-dependent transport of T1+ against electrochemical gradient into the cells of S. faecalis and Micrococcus lysodeikticus, according to the Michaelis-Menten kinetics was observed. T1+, being a K+ analog, is involved into active K+ transport. Unlike K+, T1+ readily penetrates bacterial membranes, reaching the level of stationary distribution between the cells and the medium. This permits to use T1+ as a penetrating cation to study the mechanism of potassium transport in bacteria without the use of ionophores, which can destroy the integrity of cell membranes.
D001693:Biological Transport, Active; D002414:Cations, Monovalent; D002462:Cell Membrane / Q000502:physiology; D002463:Cell Membrane Permeability; D013293:Enterococcus faecalis / Q000502:physiology*; D011188:Potassium / Q000378:metabolism; D013793:Thallium / Q000502:physiology*
D002414:Cations, Monovalent; D013793:Thallium; D011188:Potassium
Izbiratel'naia pronitsaemost' bakterial'nykh membran dlia ionov odnovalentnogo talliia.