Acts as a receptor for egr. Plays a role in activation of JNK signaling and is required for egr-induced apoptosis. May also play an egr-independent role in cell proliferation. Interacts with egr, Traf6/TRAF2 and veli (via PDZ domain). The name 'grindelwald' comes from the village at the foot of the Eiger mountain in Switzerland after which the egr gene is named.