Ribosome synthesis meets the cell cycle.

A large number of ribosome synthesis factors have been identified using proteomic analyses in yeast. The patterns of RNA and protein co-precipitation suggest that ribosome synthesis does not proceed via a linear progression of successive steps. Recent analyses have identified several interactions between factors clearly implicated in ribosome synthesis and specific steps in the cell division cycle. The intersections between these pathways were not anticipated, but potential explanations for their existence can be advanced.