pfam11357: Spy1 (this model, PSSM-Id:402800 is obsolete and has been replaced by 463263)
Cell cycle regulatory protein
Speedy (Spy1) is a cell cycle regulatory protein which activates CDK2, the major kinase that allows progression through G1/S phase and further replication events. Spy1 expression overcomes a p27-induced cell cycle arrest to allow for DNA synthesis, so cell cycle progression occurs due to an interaction between Spy1 and p27. Spy1 is also known as Ringo protein A.