Outer Mitochondrial Membrane

The outer mitochondrial membrane, which encloses the entire organelle, has a protein-to-phospholipid ratio similar to the eukaryotic plasma membrane (about 1:1 by weight). It contains numerous integral proteins called porins, which contain a relatively large internal channel (about 2-3 nm) that is permeable to all molecules of 5000 daltons or less. Larger molecules can only traverse the outer membrane by active transport through mitochondrial membrane transport proteins, and mitochondrial preproteins are imported through specialised translocase complexes. The outer membrane also contains enzymes involved in such diverse activities as the elongation of fatty acids, oxidation of epinephrine (adrenaline), and the degradation of tryptophan.

Mitochondrial proteins
Outer membrane

fatty acid degradation (Carnitine palmitoyltransferase I, Long fatty acyl CoA synthetase)

tryptophan metabolism (Kynureninase)

monoamine neurotransmitter metabolism (Monoamine oxidase)
Intermembrane space Adenylate kinase - Creatine kinase
Inner membrane

oxidative phosphorylation (Coenzyme Q - cytochrome c reductase, Cytochrome c, NADH dehydrogenase, Succinate dehydrogenase)

pyrimidine metabolism (Dihydroorotate dehydrogenase)

mitochondrial shuttle (Malate-aspartate shuttle, Glycerol phosphate shuttle)

other (Glutamate aspartate transporter, Glycerol-3-phosphate dehydrogenase, ATP synthase, Carnitine palmitoyltransferase II, Uncoupling protein)

citric acid cycle (Citrate synthase, Aconitase, Isocitrate dehydrogenase, Oxoglutarate dehydrogenase, Succinyl coenzyme A synthetase, Fumarase, Malate dehydrogenase)

anaplerotic reactions (Aspartate transaminase, Glutamate dehydrogenase, Pyruvate dehydrogenase complex)

urea cycle (Carbamoyl phosphate synthetase I, Ornithine transcarbamylase, N-Acetylglutamate synthase)

alcohol metabolism (ALDH2)

Other/to be sorted

steroidogenesis (Cholesterol side-chain cleavage enzyme, Steroid 11-beta-hydroxylase, Aldosterone synthase), Frataxin

Mitochondrial membrane transport protein (Mitochondrial permeability transition pore, Mitochondrial carrier)
Mitochondrial DNA

Complex I (MT-ND1, MT-ND2, MT-ND3, MT-ND4, MT-ND4L, MT-ND5, MT-ND6) - Complex III (MT-CYB) - Complex IV (MT-CO1, MT-CO2, MT-CO3)

ATP synthase (MT-ATP6, MT-ATP8)

see also mitochondrial diseases
B strc: edmb (perx), skel (ctrs), epit, cili, mito, nucl (chro)

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