ATP is synthesized from ADP, Pi, and a proton on the matrix side of the inner mitochondrial
Question:
a. H+ transport from the outside of the IMM into the matrix drives this process. The pH inside the matrix is 8.2, and the outside is more acidic by 0.8 pH units. Assuming the IMM membrane potential is 168 mV (inside negative), calculate G for the transport of 1 mol of H+ across the IMM into the matrix at 37 °C: H+(outside) H+(inside).
b. Assume three mol H+ must be translocated to synthesize one mol ATP by coupling of the following reactions:
Write the overall reaction for ATP synthesis coupled to H+ transport [and use this equation for part (c)]:
c. Assume three mol H+ must be translocated to synthesize one mol ATP as described in part (b) above. Given the following steady-state concentrations: ATP = 2.70 mM and Pi = 5.2o mM, the membrane potential ( = 168 mV (inside negative), and the pH values in part (a), calculate the steady-state concentration of ADP at 37 °C when G = -11.7 kJ/mol.
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Related Book For
Biochemistry Concepts and Connections
ISBN: 978-0321839923
1st edition
Authors: Dean R. Appling, Spencer J. Anthony Cahill, Christopher K. Mathews
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