JacobBob
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This is from my A2 bio book :
The phosphorylation of ADP to ATP is also catalysed by ATPase and requires 34 kJ of energy.


I’m confused, shouldn’t the synthesis of ATP be catalysed by ATP synthase and the breakdown of it be catalysed by ATPase ?
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googie3
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i think both these enzymes are the same.... please confirm...
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Jpw1097
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(Original post by JacobBob)
This is from my A2 bio book :
The phosphorylation of ADP to ATP is also catalysed by ATPase and requires 34 kJ of energy.


I’m confused, shouldn’t the synthesis of ATP be catalysed by ATP synthase and the breakdown of it be catalysed by ATPase ?
You're absolutely right, the phosphorylation of ADP to ATP is catalysed by ATP synthase (which uses the proton gradient across the inner mitochondrial membrane), NOT ATPase. An ATPase is an enzyme which splits ATP to ADP and Pi (inorganic phosphate).
An example of an ATPase is the Na+/K+-ATPase (i.e. sodium-potassium pump) which pumps 3 Na+ ions out of the cell and 2 K+ ions into the cell. The ATPase catalyses the breakdown of ATP to ADP and inorganic phosphate, releasing energy which allows the pump to pump sodium out and potassium into the cell.
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