Cellular FLICE-inhibitory protein splice variants inhibit different steps of caspase-8 activation at the CD95 death-inducing signaling complex*
Upon stimulation, CD95 (APO-1/Fas) recruits the adapter molecule FADD/MORT1, procaspase-8, and the cellular FLICE-inhibitory proteins (c-FLIP) into the death-inducing signaling complex (DISC). According to the induced proximity model, procaspase-8 is activated in the DISC in an autoproteolytic manne...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2001
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| In: |
The journal of biological chemistry
Year: 2001, Jahrgang: 276, Heft: 23, Pages: 20633-20640 |
| ISSN: | 1083-351X |
| DOI: | 10.1074/jbc.M101780200 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1074/jbc.M101780200 Verlag, Volltext: https://www.sciencedirect.com/science/article/pii/S002192581940519X 
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| Verfasserangaben: | Andreas Krueger, Ingo Schmitz, Sven Baumann, Peter H. Krammer, and Sabine Kirchhoff |
MARC
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| 520 | |a Upon stimulation, CD95 (APO-1/Fas) recruits the adapter molecule FADD/MORT1, procaspase-8, and the cellular FLICE-inhibitory proteins (c-FLIP) into the death-inducing signaling complex (DISC). According to the induced proximity model, procaspase-8 is activated in the DISC in an autoproteolytic manner by two subsequent cleavage steps. c-FLIP proteins exist as a long (c-FLIPL) and a short (c-FLIPS) splice variant, both of them capable of protecting cells from death receptor-mediated apoptosis. In stably transfected BJAB cells, both c-FLIPS and c-FLIPL block procaspase-8 activation at the DISC. However, cleavage is blocked at different steps. c-FLIPL allows the first cleavage step of procaspase-8, leading to the generation of the p10 subunit. In contrast, c-FLIPS completely inhibits cleavage of procaspase-8. Interestingly, p43-c-FLIPL lacking the p12 subunit also prevents cleavage of procaspase-8. In contrast, a nonprocessable mutant of c-FLIPL allows the first cleavage of procaspase-8. In conclusion, both c-FLIP proteins prevent caspase-8 activation at different levels of procaspase-8 processing at the DISC. Our results indicate that c-FLIPL induces a conformation of procaspase-8 that allows partial but not complete proteolytical processing, whereas in contrast c-FLIPS even prevents partial procaspase-8 activation at the DISC. | ||
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