Journal
STRUCTURE
Volume 13, Issue 11, Pages 1725-1735Publisher
CELL PRESS
DOI: 10.1016/j.str.2005.09.006
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Apaf-1 and cytochrome c coassemble in the presence of dATP to form the apoptosome. We have determined a structure of the apoptosome at 12.8 angstrom resolution by using electron cryomicroscopy and single-particle methods. We then docked appropriate crystal structures into the map to create an accurate domain model. Thus, we found that seven caspase recruitment domains (CARDS) form a central ring within the apoptosome. At a larger radius, seven copies of the nucleotide binding and oligomerization domain (NOD) associate laterally to form the hub, which encircles the CARD ring. Finally, an arm-like helical domain (HD2) links each NOD to a pair of beta propellers, which bind a single cytochrome c. This model provides insights into the roles of dATP and cytochrome c in assembly. Our structure also reveals how a CARD ring and the central hub combine to create a platform for procaspase-9 activation.
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