a co-chaperone protein that binds both Hsp70 and Hsp90 through its TPR domains. Its DnaJ domain stimulates ATP hydrolysis and polypeptide binding by Hsp70. Interacts with the proapoptotic and cell-cycle checkpoint protein Rad9. Rad9 transiently dissociates from Tpr2 following heat-shock or UV treatments. Note: This description may include information from UniProtKB.