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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Asymmetric distribution of plasma membrane proteins in mouse L-929 cells.

The distribution of plasma membrane-associated proteins was studied by using latex-filled phagolysosomes prepared from cultured mouse L-929 cells as a model of "inside-out" membrane. Proteins from 131I/lactoperoxidase-labeled phagolysosomes, phagolysosomes derived from 131I/lactoperoxidase-labeled cells, and phagolysosomes prepared from [35S]methionine metabolically labeled cells were analyzed by high-resolution two-dimensional gel electrophoresis. The gel patterns of iodinated proteins showed specific differences in the availability of membrane proteins to lactoperoxidase labeling between inside-out and right-side-out membranes. However, at least two prominent [35S]methionine-labeled proteins of approximately 60,000 and 100,000 daltons were available for iodination at both sides of the membrane. Partial proteolysis of the 100,000-dalton protein revealed that different peptides were iodinated when the iodination was performed on intact cells or on phagolysosomes, consisent with the idea that this protein spans the plasma membrane.[1]


  1. Asymmetric distribution of plasma membrane proteins in mouse L-929 cells. Evans, R.M., Ward, D.C., Fink, L.M. Proc. Natl. Acad. Sci. U.S.A. (1979) [Pubmed]
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