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Mapping and identification of HeLa cell proteins separated by immobilized pH‐gradient two‐dimensional gel electrophoresis and construction of a two‐dimensional polyacrylamide gel electrophoresis database

The HeLa cell line, a human adenocarcinoma, is used in many research fields, since it can be infected with a wide range of viruses and intracellular bacteria. Therefore, the mapping of HeLa cell proteins is useful for the investigation of parasite host cell interactions. Because of the recent improvements of two‐dimensional gel electrophoresis with immobilized pH gradients (IPG) compared to isoelectric focusing with carrier ampholytes, a highly reproducible method for examining global changes in HeLa cell protein expression due to different stimuli is now available. Therefore, we have initiated the mapping of [35S]methionine/cysteine‐labeled HeLa cell proteins with the 2‐D PAGE (IPG)‐system, using matrix‐assisted laser desorption/ionization‐mass spectrometry (MALDI‐MS) and N‐terminal sequencing for protein identification. To date 21 proteins have been identified and mapped. In order to make these and future data accessible for interlaboratory comparison, we constructed a 2‐D PAGE database on the World Wide Web.