Abstract
We have integrated preparative two-dimensional polyacrylamide gel electrophoresis with high-performance tandem mass spectrometry and Edman degradation. By using this approach, we have isolated and identified, by partial sequencing, a human melanoma protein (34 kDa, pI 6.4) as lipocortin I. To our knowledge, this protein was not previously known to be associated with melanoma cells. The identity of the protein was confirmed by two-dimensional immunoblot analysis. High-energy collision-induced dissociation analysis revealed the sequence and acetylation of the N-terminal tryptic peptide and an acrylamide-modified cysteine in another tryptic peptide. Thus, knowledge concerning both the primary structure and covalent modifications of proteins isolated from two-dimensional gels can be obtained directly by this approach, which is applicable to a broad range of biological problems.
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