Abstract
Bouyant density gradient centifugation of ‘crude membranes’ of the coryneform bacterium Brevibacterium ammoniagenes yielded two distinct membrane fractions which differed significantly in equilibrium densities (1.15 and 1.18 g/cm 3), NADH dehydrogenase activity (0.29 and 0.09 μmol·min −1·mg −1), protein composition and association of ribosomes. As determined by one dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) proteins unique to either the free membrane (FM) fraction or the denser ribosome-containing complexed membrane (CM) fraction were identified.
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