Photosynthesis160-page12 - The accumulated H ions diffuse...

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Photosynthesis - 12 The Chemiosmotic Theory of ATP Synthesis We have discussed that electrons released from molecules (such as chlorophyll) can travel down an electron transport system, releasing their energy in controlled bits. This energy, as we have said, can be used for the synthesis of ATP. In photosynthesis, the molecules of electron transport system are located in the thylakoid membrane. The energy released from the electron transport system is used to move Hydrogen ions (H + ) from the stroma into the inner thylakoid compartments by active transport. This concentration of H + in the inner compartment of the thylakoid establishes a concentration and a charge gradient in the thylakoid compartment that has a high potential energy.
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Unformatted text preview: The accumulated H + ions diffuse through ATP synthase protein complex channels in the thylakoid membranes that are coupled to ATP synthesis. As the H + ions flow down the gradient in the protein channels, their energy is used to make ATP from ADP and P on the other side of the thylakoid membrane in the stroma. Note: Peter Mitchell won the 1978 Nobel prize in chemistry "for his contribution to the understanding of biological energy transfer through the formulation of the chemiosmotic theory". ATP is synthesized in the mitochondria during cell respiration by a similar mechanism. Chemiosmotic synthesis of ATP in the Thylakoids...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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