Summary
Protons flowing back through ATP synthase down their gradient drive the formation of ATP.
In depth
Protons flow through ATP synthase's F0 channel and rotate the stalk, causing conformational changes in F1, which makes ATP (Boyer's binding change mechanism). Also used in chloroplasts and bacteria.
The proton gradient stores energy as potential like water behind a dam. ATP synthase turns it into chemical energy. Chloroplasts and bacteria use the same mechanism.
Key idea: a membrane and a gradient are required.
Frequently asked questions
What is Chemiosmosis?
Protons flowing back through ATP synthase down their gradient drive the formation of ATP.
Which area of biology covers Chemiosmosis, and how advanced is it?
Chemiosmosis is one of the 53 topics in Metabolism & Bioenergetics. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Proton Motive Force, ATP Synthase Rotary Mechanism, Light Reactions and ATP Synthesis.
Can you give an example of Chemiosmosis?
Acid bath experiments by Jagendorf made ATP in chloroplasts.
What should I learn before Chemiosmosis?
Work through the Beginner topics in Metabolism & Bioenergetics first, such as Metabolism, Anabolism and Catabolism, ATP, then return to Chemiosmosis. Intermediate topics assume the Beginner vocabulary.
What topics are related to Chemiosmosis?
The closest topics to Chemiosmosis are Proton Motive Force, ATP Synthase Rotary Mechanism, Light Reactions and ATP Synthesis, Oxidative Phosphorylation. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Chemiosmosis?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Chemiosmosis. To practise the whole of Metabolism & Bioenergetics, use the Metabolism & Bioenergetics quiz.
How is Chemiosmosis different from Proton Motive Force?
Chemiosmosis: Protons flowing back through ATP synthase down their gradient drive the formation of ATP. Proton Motive Force: The combined chemical and electrical gradient of protons that powers ATP synthase and transport. Read both side by side and note what each one explains.
How should I study Chemiosmosis step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Proton Motive Force and explain the difference aloud. Finally, take the Metabolism & Bioenergetics quiz and come back to this page for any question you miss.