0000000000326333
AUTHOR
Ernst Grell
showing 2 related works from this author
Pump currents generated by the purified Na+K+-ATPase from kidney on black lipid membranes.
1985
The transport activity of purified Na+K+-ATPase was investigated by measuring the electrical pump current induced on black lipid membranes. Discs containing purified Na+K+-ATPase from pig kidney were attached to planar lipid bilayers in a sandwich-like structure. After the addition of only microM concentrations of an inactive photolabile ATP derivative [P3-1-(2-nitro)phenylethyladenosine 5'-triphosphate, caged ATP] ATP was released after illumination with u.v.-light, which led to a transient current in the system. The transient photoresponse indicates that the discs and the underlying membrane are capacitatively coupled. Stationary pump currents were obtained after the addition of the H+, N…
Pump and Displacement Currents of Reconstituted ATP Synthase on Black Lipid Membranes
1988
Purified ATP synthase (F0F1) from Rhodospirillum rubrum was reconstituted into asolectine liposomes which were then adsorbed to a planar lipid bilayer. After the addition of an inactive photolabile ATP derivative (caged ATP), ATP was released after illumination with u.v.-light, which led to a transient current in the system. The transient photocurrent indicates that the vesicles and the planar membrane are capacitatively coupled. Stationary pump currents were obtained after addition of protonophores. These currents are specifically inhibited by oligomycin and stimulated threefold by inorganic phosphate (Pi). In analogy oligomycin sensitive pump currents in the reverse direction coupled to n…