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Abstract:

A comprehensive study of the interaction between Na+ and K + with the Na+/K+-ATPase requires dissecting the incidence of alternative cycling modes on activity measurements in which one or both of these cations are absent. With this aim, we used membrane fragments containing pig-kidney Na+/K+-ATPase to perform measurements, at 25 C and pH = 7.4, of ATPase activity and steady-state levels of (i) intermediates containing occluded Rb+ at different [Rb +] in media lacking Na+, and (ii) phosphorylated intermediates at different [Na+] in media lacking Rb+. Most relevant results are: (1) Rb+ can be occluded through an ATPasic cycling mode that takes place in the absence of Na+ ions, (2) the kinetic behavior of the phosphoenzyme formed by ATP in the absence of Na + is different from the one that is formed with Na+, and (3) binding of Na+ to transport sites during catalysis is not at random unless rapid equilibrium holds. © 2013 Elsevier B.V.

Registro:

Documento: Artículo
Título:Alternative cycling modes of the Na+/K+-ATPase in the presence of either Na+ or Rb+
Autor:Monti, J.L.E.; Montes, M.R.; Rossi, R.C.
Filiación:Instituto de Química y Fisicoquímica Biológicas, Departamento de Química Biológica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
Palabras clave:ATPase activity; Minimal model; Na+/K+-ATPase; Phosphoenzyme; Rb+-occlusion; Steady-state kinetics; adenosine triphosphatase (potassium sodium); adenosine triphosphate; rubidium; sodium ion; article; enzyme activity; enzyme binding; enzyme mechanism; enzyme metabolism; enzyme phosphorylation; molecular interaction; pH; potassium transport; priority journal; process model; sodium transport; steady state; temperature sensitivity; transport kinetics; Adenosine Diphosphate; Adenosine Triphosphate; Animals; Biocatalysis; Dose-Response Relationship, Drug; Kidney Medulla; Kinetics; Models, Biological; Phosphorylation; Protein Binding; Rubidium; Sodium; Sodium-Potassium-Exchanging ATPase; Swine
Año:2013
Volumen:1828
Número:5
Página de inicio:1374
Página de fin:1383
DOI: http://dx.doi.org/10.1016/j.bbamem.2013.01.010
Título revista:Biochimica et Biophysica Acta - Biomembranes
Título revista abreviado:Biochim. Biophys. Acta Biomembr.
ISSN:00052736
CODEN:BBBMB
CAS:adenosine triphosphate, 15237-44-2, 56-65-5, 987-65-5; rubidium, 7440-17-7; sodium ion, 17341-25-2; Adenosine Diphosphate, 58-64-0; Adenosine Triphosphate, 56-65-5; Rubidium, 7440-17-7; Sodium, 7440-23-5; Sodium-Potassium-Exchanging ATPase, 3.6.3.9
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00052736_v1828_n5_p1374_Monti

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Citas:

---------- APA ----------
Monti, J.L.E., Montes, M.R. & Rossi, R.C. (2013) . Alternative cycling modes of the Na+/K+-ATPase in the presence of either Na+ or Rb+. Biochimica et Biophysica Acta - Biomembranes, 1828(5), 1374-1383.
http://dx.doi.org/10.1016/j.bbamem.2013.01.010
---------- CHICAGO ----------
Monti, J.L.E., Montes, M.R., Rossi, R.C. "Alternative cycling modes of the Na+/K+-ATPase in the presence of either Na+ or Rb+" . Biochimica et Biophysica Acta - Biomembranes 1828, no. 5 (2013) : 1374-1383.
http://dx.doi.org/10.1016/j.bbamem.2013.01.010
---------- MLA ----------
Monti, J.L.E., Montes, M.R., Rossi, R.C. "Alternative cycling modes of the Na+/K+-ATPase in the presence of either Na+ or Rb+" . Biochimica et Biophysica Acta - Biomembranes, vol. 1828, no. 5, 2013, pp. 1374-1383.
http://dx.doi.org/10.1016/j.bbamem.2013.01.010
---------- VANCOUVER ----------
Monti, J.L.E., Montes, M.R., Rossi, R.C. Alternative cycling modes of the Na+/K+-ATPase in the presence of either Na+ or Rb+. Biochim. Biophys. Acta Biomembr. 2013;1828(5):1374-1383.
http://dx.doi.org/10.1016/j.bbamem.2013.01.010