chemiosmosis
A theoretical mechanism (proposed by Mitchell) to explain energy transduction in the mitochondrion. As a general mechanism it is the coupling of one enzyme-catalysed reaction to another using the transmembrane flow of an intermediate species, eg. cytochrome oxidase pumps protons across the mitochondrial inner membrane and ATP synthesis is ‘driven’ by re-entry of protons through the ATP-synthesizing protein complex. The alternative model is production of a chemical intermediate species, but no compound capable of coupling these reactions has ever been identified.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Chemiosmosis — is the movement of ions across a selectively permeable membrane, down their electrochemical gradient. More specifically, it relates to the generation of ATP by the movement of hydrogen ions across a membrane during cellular respiration. An Ion… …   Wikipedia

  • chemiosmosis — noun Any chemical reaction that occurs through an intervening semipermeable membrane, especially through a membrane in a biological cell Syn: chemosmosis …   Wiktionary

  • chemiosmosis — chemi·os·mo·sis (kem″e os moґsis) a mechanism by which the energy stored in a transmembrane electrochemical gradient is used to drive a process requiring energy, such as oxidative phosphorylation. Called also chemiosmotic coupling.… …   Medical dictionary

  • Oxidative phosphorylation — The electron transport chain in the mitochondrion is the site of oxidative phosphorylation in eukaryotes. The NADH and succinate generated in the citric acid cycle are oxidized, releasing energy to power the ATP synthase. Oxidative… …   Wikipedia

  • Thylakoid — A Thylakoid is a membrane bound compartment inside chloroplasts and cyanobacteria. They are the site of the light dependent reactions of photosynthesis. The word thylakoid is derived from the Greek thylakos , meaning sac . Thylakoids consists of… …   Wikipedia

  • Abiogenesis — Primordial soup redirects here. For the board game, see Primordial Soup (board game). Origin of life redirects here. For views on the origins of life outside the natural sciences, see Creation myth. Pre Cambrian stromatolites in the Siyeh… …   Wikipedia

  • Chemiosmotische Kopplung — Übergeordnet ATP Biosynthese Energiegekoppelter Protonentransport (mit dem Gradienten) Untergeordnet Chemiosmosis (Plasmamembran) Chemiosmos …   Deutsch Wikipedia

  • Chimiosmose — Un gradient ionique a une énergie potentielle et peut être utilisé comme réaction chimique produisant de l énergie lorsque les ions traversent un canal (en rouge). La chimiosmose est la diffusion des ions au travers d une membrane sélectivement… …   Wikipédia en Français

  • Cell membrane — Illustration of a Eukaryotic cell membrane The cell membrane or plasma membrane is a biological mem …   Wikipedia

  • Mitochondrion — For the metal band, see Mitochondrion (band). Two mitochondria from mammalian lung tissue displaying their matrix and membranes as shown by electron microscopy …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”