BISC110: Series 3 Experiment 9 Hill Reaction: Difference between revisions

This electron transport is coupled in two steps to the formation of ATP through the mechanism of chemiosmosis.  First, during the light reactions, the transport of electrons is coupled to the movement of protons from the stroma to the thylakoid lumen, forming a pH gradient across the thylakoid membrane.  The sources of these protons are the splitting of water, which occurs on the lumenal side of the thylakoid membrane, and the transport of protons from the stromal side across the membrane into the lumen by the electron transport chain components plastoquinone and cytochrome b/f complex.  In the second step, this gradient of protons is released when the protons diffuse through the membrane-spanning ATP-synthase molecule, which couples proton movement to the synthesis of ATP from ADP and Pi.  

<br><br>

<br>

The process resulting in the formation of NADPH and ATP is called non-cyclic photophosphorylation.