Which group of proteins control the cycle of a eukaryotic cell?

The name of the group of proteins that controls the cycle of a eukaryotic cell is Ubiquitin. Ubiquitin is a small regulatory protein that has been found in almost all tissues (ubiquitously) of eukaryotic organisms. It can affect proteins in many ways: it can signal for their degradation via the proteasome, alter their cellular location, affect their activity, and promote or prevent protein interactions.

Try and make the question more clear : )