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        Protein Identification by MALDI-TOF Mass Spectrometry

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        MALDI-TOF mass spectrometers are now commonplace and their relative ease of use means that most non-specialist labs can readily access the technology for the rapid and sensitive analysis of biomolecules. One of the main uses of MALDI-TOF-MS is in the identification of proteins, by peptide mass fingerprinting (PMF). Here we describe a simple protocol that can be performed in a standard biochemistry laboratory, whereby proteins separated by 1D or 2D gel electrophoresis can be identified at femtomole levels. The procedure involves excision of the spot or band from the gel, washing and destaining, reduction and alkylation, in-gel trypsin digestion, MALDI-TOF-MS of the tryptic peptides and database searching of the PMF data. Up to 96 protein samples can easily be manually processed at one time by this method.
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