Membrane Structure by D. Branton, D. W. Deamer (auth.)

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By D. Branton, D. W. Deamer (auth.)

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J. :. " Ub'qu Inone • DPN Fig. 7. Packing density of respiratory enzymes in mitochondrial inner membranes. From KLINGENBERG (1968). This result is a maximum value. If 16,000 is used as a turnover number, the ATPase would correspond to 22 per cent of the membrane protein. Similar calculations for mammalian muscle microsome preparations, which may not be as pure, give values of 5-10 per cent of the membrane protein as ATPase (BADER et aZ. 1968). A second membrane structure in which the amount of functional membrane protein can be estimated is the inner mitochondrial membrane.

It was suggested that these subunits, with groups of four being the possible equivalent of one quantasome, form lamellar aggregates which are the thylakoid membranes. The suggestion that membrane subunits can be seen in cross sectioned thylakoid lamellae requires careful scrutiny, particularly since similar claims have been advanced in connection with a number of different membrane systems (ROBERTSON 1966). Sections for electron microscopy are usually thicker than 400 A, and an electron microscope would not resolve one layer of particles but at best produce a compound image of several particles.

1969) used sodium dodecyl sulfate (SDS) to solubilize Mycoplasma membranes. Upon removal of the detergent, membranous structures reappeared. YANAGIDA and NODA (1969) utilized a number of treatments, particularly high pH, to solubilize plasma membranes of myxamoebae. At pH 11, the membranes dissociated into particulate structures with a ? S sedimentation coefficient. Lowering the pH caused a reaggregation of the particles into several morphological forms, among them structures resembling the parent membrane, double-thickness membranes, filaments, and random aggregates.

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