Abstract
Proteins of whole mitochondria from mouse liver and brain and proteins of liver mitochondrial fractions (plasma and rough membrane fraction) were separated by two-dimensional electrophoresis. Protein patterns of two inbred strains of mouse, C57BL/6J and DBA/2J, and of F1 mice of these two strains were studied. The protein patterns obtained from the different mitochondrial materials were analyzed with regard to their protein composition and the genetic variability of proteins (qualitative and quantitative protein variants). Included in this analysis are data previously obtained from the cytosols and plasma membranes of the same organs and mouse strains. The results showed the following. (1) Mitochondria and organelle-free cell components (cytosol and plasma membranes) have only a few percent of their proteins in common, while two organs, liver and brain, reveal up to approximately 50% organ-nonspecific proteins. The frequency of proteins common to solubilized and structure-bound proteins ranges below 20%. (2) Genetic variability in protein amount occurs much more frequently than genetic variability in protein structure. Liver proteins reveal more genetic variants than brain proteins. Proteins solubilized in the cell show more genetic variation than structure-bound proteins. Furthermore, the results show that with regard to the composition and the genetic variability of proteins, liver and brain differ more in their mitochondria than in their cytosol and plasma membranes.
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This work was supported by grants from the Deutsche Forschungsgemeinschaft awarded to Sonderforschungsbereich 29.
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Jungblut, P., Klose, J. Genetic variability of proteins from mitochondria and mitochondrial fractions of mouse organs. Biochem Genet 23, 227–245 (1985). https://doi.org/10.1007/BF00504321
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DOI: https://doi.org/10.1007/BF00504321