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A subcellular prefractionation protocol for minute amounts of mammalian cell cultures and tissue
Author(s) -
Guillemin Isabelle,
Becker Michael,
Ociepka Kornelia,
Friauf Eckhard,
Nothwang Hans Gerd
Publication year - 2005
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200400892
Subject(s) - proteome , subcellular localization , gel electrophoresis , organelle , protein subcellular localization prediction , cell fractionation , biology , two dimensional gel electrophoresis , biochemistry , membrane protein , proteomics , cytoplasm , sodium dodecyl sulfate , chemistry , membrane , gene
Subcellular localization represents an essential, albeit often neglected, aspect of proteome analysis. Generally, the subcellular location of proteins determines the function of cells and tissues. Here we present a robust and versatile prefractionation protocol for mammalian cells and tissues which is appropriate for minute sample amounts. The protocol yields three fractions: a nuclear, a cytoplasmic, and a combined membrane and organelle fraction. The subcellular specificity and the composition of the fractions were demonstrated by immunoblot analysis of five marker proteins and analysis of 43 proteins by two‐dimensional gel electrophoresis and mass spectrometry. To cover all protein species, both conventional two‐dimensional and benzyldimethyl‐ n ‐hexadecyl ammonium chloride‐sodium dodecyl sulfate (16‐BAC‐SDS) gel electrophoresis were performed. Integral membrane proteins and strongly basic nuclear histones were detected only in the 16‐BAC‐SDS gel electrophoresis system, confirming its usefulness for proteome analysis. All but one protein complied to the respective subcellular composition of the analyzed fractions. Taken together, the data make our subcellular prefractionation protocol an attractive alternative to other prefractionation methods which are based on less physiological protein properties.