eLife assessment
This study provides compelling data that defines the structure of the S. cerevisiae APC/C. The structure reveals overall conservation of its mechanism of action compared to the human APC/C but some important differences that indicate that activation by co-activator binding and phosphorylation are not identical to the human APC/C. Thus this study will be of considerable value to the field, although the conclusions regarding the effect of phosphorylation would be strengthened by quantification of the phosphopeptides. Recent work on the role of APC7 in APC/C activity in neurones should also be discussed with respect to the mode of action of the APC/C in human versus budding yeast cells.