PIAS-1 is a checkpoint regulator which affects exit from G1 and G2 by sumoylation of p73
Molecular and cellular biology (2004) - Comments
pubmed: 15572666  doi: 10.1128/mcb.24.24.10593-10610.2004  issn: 0270-7306  issn: 1098-5549 

Eliana Munarriz, Daniela Barcaroli, Anastasis Stephanou, Paul A. Townsend, Carine Maisse, Alessandro Terrinoni, Michael H. Neale, Seamus J. Martin, David S. Latchman, Richard A. Knight, Gerry Melino, Vincenzo De Laurenzi