This family includes a conserved region from a group of yeast proteins that associate with the SIT4 phosphatase. This association is required for SIT4's role in G1 cyclin transcription and for bud formation. This family also includes homologous regions from other eukaryotes.

1: The SAP, a new family of proteins, associate and function positively with the SIT4 phosphatase. Luke MM, Della Seta F, Di Como CJ, Sugimoto H, Kobayashi R, Arndt KT; Mol Cell Biol 1996;16:2744-2755. PMID:8649382