Rad9 is required for transient cell-cycle arrests and transcriptional induction of DNA repair in response to DNA damage. It contains a Bcl-2 homology domain 3 (BH3) [2].

1: The budding yeast Rad9 checkpoint protein is subjected to Mec1/Tel1-dependent hyperphosphorylation and interacts with Rad53 after DNA damage. Vialard JE, Gilbert CS, Green CM, Lowndes NF; EMBO J 1998;17:5679-5688. PMID:9755168

2: Apoptosis and lipoapoptosis in the fission yeast Schizosaccharomyces pombe. Low CP, Liew LP, Pervaiz S, Yang H; FEMS Yeast Res. 2005;5:1199-1206. PMID:16137929