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A simple and efficient method for processing of cell lysates for two‐dimensional gel electrophoresis
Author(s) -
Xavier Tessy,
Ganesan Trivadi S.,
Me Krishnakumar N.
Publication year - 2010
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200900644
Subject(s) - lysis , chemistry , thiourea , lysis buffer , chromatography , urea , nucleic acid , isoamyl alcohol , sonication , protein precipitation , biochemistry , denaturation (fissile materials) , extraction (chemistry) , alcohol , organic chemistry , nuclear chemistry
Sample preparation is one of the major issues in 2‐DE for the separation of proteins. Although a 100% representation of cellular proteins onto a 2‐DE is virtually impossible, maximum representation of cellular proteins compared with the original cell lysate is important in the subsequent analysis. We demonstrate that lysis of cells in urea/thiourea solution with subsequent sonication to disrupt the nucleic acids and concentration of the lysate using centri‐con led to enrichment of proteins. The procedure resulted in minimal nucleic acid contamination with better resolution of spots. 2‐DE spot patterns of proteins prepared using urea–thiourea solubilization/centri‐con method to other protein enrichment methods such as phenol/chloroform/isoamyl alcohol extraction, methanol/ammonium acetate precipitation, acetone precipitation and ethanol precipitation were compared. Urea–thiourea solubilization combined with centri‐con method of protein enrichment represented higher number/unique spots particularly in the 50–250 kDa M r compared with others. Lysis of cells in urea/thiourea from the beginning of lysate preparation preserves the proteins from protease activity due to denaturation of proteases. Thus, we demonstrate that the centri‐con methodology is simple and effective for the preparation of high‐quality sample that can be used for a qualitative representation of cellular proteins on a 2‐DE for proteomic analysis.