Mitchell proposed the chemiosmotic hypothesis in 1961
The Chemiosmotic Hypothesis - Department of Biology
a text description of the chemiosmotic hypothesis of Mitchell
The chemisosmotic hypothesis first postulated by in 1961 describes the process of generation in the final stage of , namely in the . This process was also discovered to take place in the of as a means of generating ATP and reduced in the light dependent reaction, key products needed for the light independent reaction to generate in plants. Chemiosmosis in both plants and animals are essentially the same however there are a few subtleties in the creation of the proton gradient related to the electron transport chain.
The chemiosmotic hypothesis suggests that the action of is coupled with that of a . It is the action of the proton gradient that causes a that allows ATP synthase to phosphorylate and inorganic phosphate to ATP. In mitochondria, the key site of ATP production in oxidative phosphorylation is the inner mitochondrial membrane. Pumping of hydrogen ions to generate a gradient is facilitated by transmembranal proteins called electron carriers. These electron carriers are sites of for and with each reaction across the electron carriers the electrons energy is transferred into the pumping of across the membrane, this results in a high concentration in the intermembranal space than that of the matrix. The protons go through the ATPsynthase from an area of high concentration in the intermembranal space to an area of lower concentration, the mitochondrial matrix, through facilitated diffusion generating ATP. The proton-motive force is the mathematical sum of the chemical gradient, expressed as the difference in pH between the matrix and intermembranal space, and the charge gradient created by the disequilibrium (via proton pumping) of proton distribution either side of the inner membrane.
Chemiosmotic Hypothesis of Oxidative …
This work belongs to the Mitchell’s dream series, inspired by the Chemiosmotic hypothesis that penetrates all biology. The Nobel prize winning British biochemist Peter Mitchell first published his ideas on the proton motive force in Nature in 1961. The equations here suggest the mitochondrial network.
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The chemiosmotic theory
Oxidative phosphorylation and chemi…
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