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Activation energies of the ATPase activity of sarcoplasmic reticulum

Madeira, V M ; Antunes-Madeira, M C ; Carvalho, A P

Biochemical and biophysical research communications, 18 June 1974, Vol.58(4), pp.897-904 [Periódico revisado por pares]

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  • Título:
    Activation energies of the ATPase activity of sarcoplasmic reticulum
  • Autor: Madeira, V M ; Antunes-Madeira, M C ; Carvalho, A P
  • Assuntos: Adenosine Triphosphatases -- Metabolism ; Sarcoplasmic Reticulum -- Enzymology
  • É parte de: Biochemical and biophysical research communications, 18 June 1974, Vol.58(4), pp.897-904
  • Descrição: Arrhenius plots of Ca ++-stimulated ATP hydrolysis by sarcoplasmic reticulum (SR) show breaks (T t) at 16.7°C and 11.5°C for rabbit and lobster preparations, respectively. The energies of activation (Eact) are about 10 and 19.5 Kcal/mole above and below T t, respectively, and are similar for both lobster and rabbit SR. The antibiotic filipin increases T t by about 7°C for both preparations, but the Eact above and below the new T t values remain similar to those of the controls. Desintegrated membranes do not show breaks in Arrhenius plots and the Eact assume relatively high values. The Ca ++ ionophore X-537A does not affect either the T t values nor the Eact.
  • Idioma: Inglês

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