Convenient and versatile subcellular extraction procedure, that facilitates classical protein expression profiling and functional protein analysis

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.