Should I use 1D or 2D SDS PAGE?
I’m interested in isolating and identifying cell surface receptor proteins.
In my experience, they typically have high MW, transmembrane domains, and are glycosylated.
I’m considering 2D electrophoresis, but do you have any recommendations?
2D PAGE is the classical approach to separating and visualizing many proteins from complex proteomics samples. It can give you an idea of the sample purity, which is helpful before running mass spectrometry analyses relying on a sample with relatively high chromatographic purity (>80%), such as intact mass determination or peptide mapping. However, 2D PAGE also has some known disadvantages.
For example, you rarely observe hydrophobic membrane proteins because they precipitate during IEF. So because of this, you will most likely only watch proteins within the pI range of the gel, typically pH 4-7 or 3-10, and the MW range of proteins in the gel is approximately 10-130 kDa [1-3].
Therefore, it is better to use 1D SDS PAGE for large and hydrophobic proteins. The main reason is that you can dissolve the proteins in the 1D SDS PAGE buffer containing 0.1% SDS. But in addition, the gels have no pI limits, and the MW range can go up as high as 1.000 kDa .
Another possibility is to use in-solution digestion of the protein mixture. This approach is the alternative to running a gel and cutting out the bands of interest before in-gel digestion and protein ID of each band. Typically, you would identify hundreds or even thousands of proteins by LC-MS/MS and a subsequent database search in Swiss-Prot/UniProtKB [1-3].
Related blog posts:
If you are considering sending samples for mass spec services, I also recommend that you take some time to check out these other blog posts for more information on how to optimize the use of SDS gels:
 Sickmann et al.: “The proteome of Saccharomyces cerevisiae mitochondria,” Proceedings of the National Academy of Sciences of the United States of America (PNAS), 2003
 Andersen et al.: “Directed Proteomic Analysis of the Human Nucleolus,” Current Biology, 2002
 Wiśniewski et al.: “Universal sample preparation method for proteome analysis,” Nature Methods, 2009