- Books Name
- ACME SMART COACHING Biology Book
- Publication
- ACME SMART PUBLICATION
- Course
- CBSE Class 11
- Subject
- Biology
Chemiosmotic Hypothesis
Generation of ATP in light reaction is called photophosphorylation.
Chemiosmotic hypothesis was first explained by P. Mitchell.
As a result of (a) photolysis towards thylakoid lumen, (b) quinone pump, which takes H+ from stroma to lumen, and (c) NADP+ reductase reaction towards stroma; H+ concentration in thylakoid lumen increases by 1000-2000 times and as a result a proton motive force develops.
This force is responsible for ATP synthesis on the head of CF0 – CF1 particle plugged on thylakoid membrane. The CF0 part forms facilitated channel for proton diffusion towards stroma. Movement of 3H+ is involved in the synthesis of 1 ATP.