Cytochrome c and dATP-Dependent Formation of Apaf-1/Caspase-9 Complex Initiates an Apoptotic Protease Cascade
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منابع مشابه
Cytochrome c and dATP-Dependent Formation of Apaf-1/Caspase-9 Complex Initiates an Apoptotic Protease Cascade
We report here the purification of the third protein factor, Apaf-3, that participates in caspase-3 activation in vitro. Apaf-3 was identified as a member of the caspase family, caspase-9. Caspase-9 and Apaf-1 bind to each other via their respective NH2-terminal CED-3 homologous domains in the presence of cytochrome c and dATP, an event that leads to caspase-9 activation. Activated caspase-9 in...
متن کاملFormation of apoptosome is initiated by cytochrome c-induced dATP hydrolysis and subsequent nucleotide exchange on Apaf-1.
Apoptosis in metazoans is executed by a group of intracellular proteases named caspases. One of the caspase-activating pathways in mammals is initiated by the release of cytochrome c from mitochondria to cytosol, where it binds to Apaf-1 to form a procaspase-9-activating heptameric protein complex named apoptosome. We report here the reconstitution of this pathway with purified recombinant Apaf...
متن کاملCytochrome c binding to Apaf-1: the effects of dATP and ionic strength.
In the apoptosis pathway in mammals, cytochrome c and dATP are critical cofactors in the activation of caspase 9 by Apaf-1. Until now, the detailed sequence of events in which these cofactors interact has been unclear. Here, we show through fluorescence polarization experiments that cytochrome c can bind to Apaf-1 in the absence of dATP; when dATP is added to the cytochrome c.Apaf-1 complex, fu...
متن کاملAPAF 1 ( Apoptotic protease activating factor 1 )
Five isoforms of APAF1 cDNA have been identified in Homo sapiens: The original APAF1 (also called Apaf-1S) is 3585 bp long (it contains 12 WD40 repeats); The APAF1-1M isoform (3618 bp) contains an insertion of 33 nt after position 295 of the first published sequence (11 aa insertion GKDSVSGITSY between aa 98 and 99; it also contains 12 WD40 repeats); The APAF1XS isoform (3516 bp) contains the s...
متن کاملInduction of Apoptotic Program in Cell-Free Extracts: Requirement for dATP and Cytochrome c
A cell-free system based on cytosols of normally growing cells is established that reproduces aspects of the apoptotic program in vitro. The apoptotic program is initiated by addition of dATP. Fractionation of cytosol yielded a 15 kDa protein that is required for in vitro apoptosis. The absorption spectrum and protein sequence revealed that this protein is cytochrome c. Elimination of cytochrom...
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ژورنال
عنوان ژورنال: Cell
سال: 1997
ISSN: 0092-8674
DOI: 10.1016/s0092-8674(00)80434-1