A bacterial atp synthase has 10 c subunits, and a chloroplast atp synthase has 14 c subunits. Would you expect the bacterium or the chloroplast to have a higher p:o ratio?

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18-08-2022
Biology

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A bacterial atp synthase has 10 c subunits, and a chloroplast atp synthase has 14 c subunits. Would you expect the bacterium or the chloroplast to have a higher p:o ratio?

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Bacterium will have a higher p:o ratio than Chloroplast

Bacterial ATP synthase has 10 c subunit. Therefore, bacterial ATP synthase thus requires 10 protons to synthesize three ATP, or 10/3. In contrast, Chloroplast ATP synthase has 14 c subunit. Therefore, bacterial ATP synthase thus requires 14 protons to synthesize three ATP, or 14/3

What is P:O ratio ?

The P:O ratio is obtained by calculating the total amount of ATP produced by reducing an oxygen atom and is also dependent on the proton translocation number. Every full rotation of ATP synthase produces 3 ATP. The number of hydrogen translocated per rotation is directly proportional to the number of c subunits.

Knowledge of the P/O ratio is fundamental for understanding the ATP yield from cell fuels and is a core metabolic parameter.

Hence, Chloroplast ATP synthase has a higher P:O ratio (14/3) than bacterial ATP synthase (10/3).

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