Abstract
Cytolysis mediated by complement or cytolytic lymphocytes results in the formation of morphology similar lesions in the target membrane1–6. These lesions, formed by the polymerization of C9 or perforin respectively, contribute the major killing action by causing osmotic lysis of the target cell. Following the suggestion of Mayer7 that the mechanisms of humoral and cell-mediated cytotoxicity might be related, studies into the morphology of the membrane lesions formed8–13, and the proteins responsible for causing the lesions9,14,15, have shown several similarities. While the lesion caused by natural and T-killer cells is a little larger than that caused by complement, its overall shape is similar and in both cases the cylindrical pore is formed by polymerization of a monomeric subunit, C9 (relative molecular mass, Mr = 71,000) for complement9, and perforin (Mr = 66,000) for cell-mediated cytotoxicity14,15. C9 has an absolute requirement for a receptor in the target membrane formed by the earlier membrane attack complex components, C5b, C6, C7 and C8 (ref. 8). For perforin, polymerization in a target membrane requires no receptor, specificity being derived from the specific recognition between killer and target cell. Both proteins can be made to polymerize in vitro by the addition of divalent cations (Zn2+ for C9 (ref. 16) and Ca2+ for perforin10,12,13) and the resultant complexes closely resemble their physiological counterparts. Antibodies raised against lymphocyte-killed targets have also been shown to cross-react with complement proteins17,18,33, but the antigenically related proteins were not determined in these studies. We show here using purified proteins that perforin, C9 and complexes involving C7 and C8 share a common antigenic determinant which is probably involved in polymerization.
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Tschopp, J., Masson, D. & Stanley, K. Structural/functional similarity between proteins involved in complement- and cytotoxic T-lymphocyte-mediated cytolysis. Nature 322, 831–834 (1986). https://doi.org/10.1038/322831a0
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DOI: https://doi.org/10.1038/322831a0
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