This fractionation protocol will allow researchers to isolate cytoplasmic, nuclear, mitochondrial, and membrane proteins from mammalian cells. The latter two subcellular fractions are further purified via isopycnic density gradient.
McCaig, W. D., Deragon, M. A., Truong, P. V., Knapp, A. R., LaRocca, T. J. Cell Fractionation of U937 Cells by Isopycnic Density Gradient Purification. J. Vis. Exp. (174), e62119, doi:10.3791/62119 (2021).