Comparative analysis of proapoptotic activity of cytochrome c mutants in living cellsстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Comparative analysis of proapoptotic activity of cytochrome c mutants in living cells / G. V. Sharonov, A. V. Feofanov, O. V. Bocharova et al. // Apoptosis. — 2005. — Vol. 10, no. 4. — P. 797–808. A non-traumatic electroporation procedure was developed to load exogenous cytochrome c into the cytoplasm and to study the apoptotic effect of cytochrome c, its K72-substitued mutants and "yeast –> horse" hybrid cytochrome c in living WEHI-3 cells. The minimum apoptosis-activating intracellular concentration of horse heart cytochrome c was estimated to be 2.7 +/- 0.5 microM (47 +/- 9 fg/cell). The equieffective concentrations of the K72A-, K72E- and K72L-substituted mutants of cytochrome c were five-, 15- and 70-fold higher. The "yeast –> horse" hybrid created by introducing S2D, K4E, A7K, T8K, and K11V substitutions (horse protein numbering) and deleting five N-terminal residues in yeast cytochrome c did not evoke apoptotic activity in mammalian cells. The apoptotic function of cytochrome c was abolished by the K72W substitution. The K72W-substituted cytochrome c possesses reduced affinity to the apoptotic protease activating factor-1 (Apaf-1) and forms an inactive complex. This mutant is competent as a respiratory-chain electron carrier and well suited for knock-in studies of cytochrome c-mediated apoptosis. [ DOI ]

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