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Kee, Jung-Min; Oslund, Rob C; Perlman, David H; Muir, Tom W
Nature chemical biology, 07/2013, Letnik: 9, Številka: 7Journal Article
Despite its importance in central metabolism and bacterial cell signaling, protein histidine phosphorylation has remained elusive with respect to its extent and functional roles in biological systems because of the lack of adequate research tools. We report the development of the first pan-phosphohistidine (pHis) antibody using a stable pHis mimetic as the hapten. This antibody was successfully used in ELISA, western blotting, dot blot assays and immunoprecipitation and in detection and identification of histidine-phosphorylated proteins from native cell lysates when coupled with MS analysis. We also observed that the amount of protein pHis in Escherichia coli lysates depends on carbon source and nitrogen availability in the growth medium. In particular, we found that the amount of pHis on phosphoenolpyruvate synthase (PpsA) is sensitive to nitrogen availability in vivo and that α-ketoglutarate inhibits phosphotransfer from phosphorylated PpsA to pyruvate. We expect this antibody to open opportunities for investigating other pHis proteins and their functions.
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in: SICRIS
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