Publikation: Effects of the ATP, ADP and inorganic phosphate on the transport rate of the Na,K-pump
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(Na+K)-ATPase from kidney outer medulla was incorporated into artificial dioleoylphosphatidylcholine vesicles. In the reconstituted system the pump can be activated by adding ATP to the external medium. ATP-driven potassium extrusion by the Na,K-pump was studied using a voltage-sensitive dye in the presence of valinomycin. ADP strongly reduced the turnover rate of the pump with a concentration for half-maximal inhibition of cD,1/2 =0.1 mM. cD,1/2 was found to be virtually independent of ATP concentration, indicating that the inhibition is non-competitive with respect to ATP. The non-competitive inhibition by ADP can be explained on the basis of the Post-Albers reaction cycle of the Na,K-pump, assuming that the main action of ADP is the reversal of the phosphorylation step.
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APELL, Hans-Jürgen, M. NELSON, Madeleine M. MARCUS, Peter LÄUGER, 1986. Effects of the ATP, ADP and inorganic phosphate on the transport rate of the Na,K-pump. In: Biochimica et Biophysica Acta - Biomembranes. 1986, 857(1), pp. 105-115. ISSN 0005-2736. Available under: doi: 10.1016/0005-2736(86)90103-3BibTex
@article{Apell1986Effec-7113,
year={1986},
doi={10.1016/0005-2736(86)90103-3},
title={Effects of the ATP, ADP and inorganic phosphate on the transport rate of the Na,K-pump},
number={1},
volume={857},
issn={0005-2736},
journal={Biochimica et Biophysica Acta - Biomembranes},
pages={105--115},
author={Apell, Hans-Jürgen and Nelson, M. and Marcus, Madeleine M. and Läuger, Peter}
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<dcterms:abstract xml:lang="eng">(Na+K)-ATPase from kidney outer medulla was incorporated into artificial dioleoylphosphatidylcholine vesicles. In the reconstituted system the pump can be activated by adding ATP to the external medium. ATP-driven potassium extrusion by the Na,K-pump was studied using a voltage-sensitive dye in the presence of valinomycin. ADP strongly reduced the turnover rate of the pump with a concentration for half-maximal inhibition of cD,1/2 =0.1 mM. cD,1/2 was found to be virtually independent of ATP concentration, indicating that the inhibition is non-competitive with respect to ATP. The non-competitive inhibition by ADP can be explained on the basis of the Post-Albers reaction cycle of the Na,K-pump, assuming that the main action of ADP is the reversal of the phosphorylation step.</dcterms:abstract>
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