By G. Rickey Welch
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Extra info for Organized Multienzyme Systems: Catalytic Properties
Knecht et á\. (1979) labeled CPS antibodies with ferritin and then incubated them with tissue that had been treated with (postembedding) sodium methoxide. This treatment was necessary to render the cells and organelles permeable to the large ferritin-antibody molecule. Individual ferritin molecules could be observed with the electron microscope. The ferritin molecules were distributed homogeneously throughout the mitochondrial matrix. By counting the number of ferritin molecules per square micrometer of mitochondrial surface an independent measure of carbamoyl phosphate synthetase in rat liver could be made.
If one assumes an average spherical protein molecule of the mitochondrial matrix to be 60 Â, then it is possible to calculate the average distance between cristal surfaces in terms of surface area-volume ratios and protein molecules. This can then be compared to the measured surface areavolume ratio for mitochondria and a model of the inner membrane-matrix compartment can be visualized. I have made these calculations (Table VI). 0-nm diameter proteins) between the inner membrane inner surfaces.
From experiments in which the matrix volume was held constant and the concentration of solutes in the medium was varied, Garlid (1979) concluded that the mitochondrial matrix had at least two different water compartments. This could reflect the existence of a layer of water two or three molecules deep around each protein molecule (Peschel and Belouschek, 1979) in addition to the bulk water. If this is true, the apparent concentration of limiting metabolites might be much higher than the calculated values.
Organized Multienzyme Systems: Catalytic Properties by G. Rickey Welch