Standardized sample preparation to reduce proteome complexity facilitates subsequent proteome analysis. Here we describe a robust sequential extraction method that enables simple fractionation of proteins in their native state according to their subcellular localization, yielding four subproteomes enriched in (a) cytosolic; (b) membrane and membrane organelle-localized; (c) soluble and DNA-associated nuclear and (d) cytoskeletal proteins. Efficiency and selectivity is demonstrated by morphological-, two-dimensional electrophoresis image-, immunological- as well as enzymatic-analysis. In pilot studies, subcellular redistribution of regulatory proteins was successfully measured.
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