Intermembrane space of mitochondria

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Image:Diagram of a human mitochondrion.svg Because of channels in the outer membrane of the mitochondria, the content of the intermembrane space is similar to that of the content of the cytoplasm.

As electrons move down the proteins in the electron transport chain, the electrons lose energy to bring H+ ions from the mitochondrial matrix into the intermembrane space. As a concentration gradient of hydrogen ions forms, a protein called ATP synthase harnesses the potential energy of these ions and starts chemiosmosis, where the H+ ions reenter the matrix via this enzyme bound to the cristae (folds of the inner membrane). ADP and a phosphate group are combined to form ATP.

v • d • e Mitochondrial enzymes and transporters
Outer membrane	Long fatty acyl CoA synthetase - Kynureninase - Monoamine oxidase
Intermembrane space	Adenylate kinase - Creatine kinase
Inner membrane	Coenzyme Q - cytochrome c reductase -Cytochrome c - Dihydroorotate dehydrogenase -Glutamate aspartate transporter - Glycerol-3-phosphate dehydrogenase - NADH dehydrogenase - Succinate dehydrogenase
Matrix	Aconitase - Aspartate transaminase - ALDH2 - Carbamoyl phosphate synthase - Citrate synthase - Fumarase - Glutamate dehydrogenase - Isocitrate dehydrogenase - Malate dehydrogenase - Ornithine transcarbamoylase - Oxoglutarate dehydrogenase - Pyruvate dehydrogenase complex - Succinyl coenzyme A synthetase
Mitochondrial DNA	Complex I (7 units) - Complex III (1 unit) - Complex IV (3 units) - ATP synthase (2 units)

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