Identification of proteins from one-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis using electrospray quadrupole-time-of-flight tandem mass spectrometry

The potential of electrospray tandem mass spectrometry using a quadrupole-time-of-flight tandem mass spectrometer was evaluated for the identification of two unknown proteins from one-dimensional polyacrylamide gel electrophoresis (1-D-PAGE). Two proteins from cellular cultures of mammary epithelia were purified by 1D-PAGE. Their identification was achieved using peptide sequence tags generated by LC/Q-TOF-MS/MS, whereas MALDI-TOF mass mapping failed for these proteins obtained from simple 1D-PAGE separation.