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• W1603898340 abstract "Granzyme B (cytotoxic cell proteinase 1) is a serine proteinase that has been implicated in cytotoxic T lymphocyte-induced apoptosis. In order to understand how granzyme B is involved in mechanisms of target cell destruction, characterization and identification of substrates are required. We have developed an in situ binding assay using permeabilized cells and recombinant granzyme B that allows us to visualize potential substrates after immunostaining with anti-granzyme B antiserum.Confocal laser scanning microscopy and immunoelectron microscopic analyses demonstrate that granzyme B recognizes a nuclear substrate. The labeling pattern observed corresponds with regions of positive staining with uranyl acetate which binds to heterochromatin in the nucleus. Positive labeling of target cells with granzyme B is dependent on the presence of a catalytically active proteinase, since an inactive proenzyme form of granzyme B fails to give rise to any binding in the target cells. Far-Western blotting and immunoprecipitation of subcellular fractions of target cells have shown that the putative substrate of catalytically active granzyme B is an 80-kDa nuclear protein. Minor cytosolic bands of 50 and 94 kDa are also observed. A cytoplasmic band of 69 kDa is detected by both active and zymogen forms of granzyme B. Granzyme B (cytotoxic cell proteinase 1) is a serine proteinase that has been implicated in cytotoxic T lymphocyte-induced apoptosis. In order to understand how granzyme B is involved in mechanisms of target cell destruction, characterization and identification of substrates are required. We have developed an in situ binding assay using permeabilized cells and recombinant granzyme B that allows us to visualize potential substrates after immunostaining with anti-granzyme B antiserum. Confocal laser scanning microscopy and immunoelectron microscopic analyses demonstrate that granzyme B recognizes a nuclear substrate. The labeling pattern observed corresponds with regions of positive staining with uranyl acetate which binds to heterochromatin in the nucleus. Positive labeling of target cells with granzyme B is dependent on the presence of a catalytically active proteinase, since an inactive proenzyme form of granzyme B fails to give rise to any binding in the target cells. Far-Western blotting and immunoprecipitation of subcellular fractions of target cells have shown that the putative substrate of catalytically active granzyme B is an 80-kDa nuclear protein. Minor cytosolic bands of 50 and 94 kDa are also observed. A cytoplasmic band of 69 kDa is detected by both active and zymogen forms of granzyme B." @default.
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• W1603898340 date "1996-04-01" @default.
• W1603898340 modified "2023-09-27" @default.
• W1603898340 title "Binding of Granzyme B in the Nucleus of Target Cells" @default.
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• W1603898340 doi "https://doi.org/10.1074/jbc.271.17.10225" @default.
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