Association of Chk1 with 14-3-3 proteins is stimulated by DNA damage

DNA damage-dependent links between phosphorylated Chk1 and 14-3-3 proteins suggest these mediate a significant step on the DNA-damage checkpoint path. The 14-3-3 proteins Rad24 and Rad25 interact with Chk1 in fission yeast. Once DNA is damaged, Chk1 is phosphorylated and the 14-3-3 proteins prefer binding to that form. In fission yeast, the interaction between 14-3-3 proteins and Cdc25 does not require Chk1 function.