title: Intramitochondrial localization of the 4-aminobutyrate-2-oxoglutarate transaminase from ox brain.
abstract: In order to determne the intramitochondrial location of 4-aminobutyrate transaminase, mitochondria were prepared from ox brain and freed from myelin and synaptosomes by using conventional density-gradient-centrifugation techniques, and the purity was checked electron-microscopically. Inner and outer membranes and matrix were prepared from the mitochondria by large-amplitude swelling and subsequent density-grient centrifugation. The fractions were characterized by using both electron microscopy and different marker enzymes. From the specific activity of the 4-aminobutyrate transaminase in the submitochondrial fractions it was concluded that this enzyme is associated with the innter mitochondrial membrane.
mesh_terms: D000612:4-Aminobutyrate Transaminase / Q000378:metabolism*; D000818:Animals; D001219:Aspartate Aminotransferases / Q000378:metabolism; D001921:Brain / Q000201:enzymology* / Q000648:ultrastructure; D002417:Cattle; D002462:Cell Membrane / Q000378:metabolism / Q000648:ultrastructure; D002499:Centrifugation, Density Gradient; D007521:Isocitrate Dehydrogenase / Q000378:metabolism; D008854:Microscopy, Electron; D008928:Mitochondria / Q000201:enzymology* / Q000648:ultrastructure; D000637:Transaminases / Q000378:metabolism*
chemical_list: D007521:Isocitrate Dehydrogenase; D000637:Transaminases; D001219:Aspartate Aminotransferases; D000612:4-Aminobutyrate Transaminase