DnaJ homolog subfamily C member 3 (DNAJC3)

Involved in the unfolded protein response (UPR) through endoplasmic reticulum (ER) stress. Acts as a negative regulator of the EIF2AK4/GCN2 kinase activity by preventing the phosphorylation of eIF-2-alpha at'Ser-52' and hence attenuating overall protein synthesis under ER stress, hypothermic and amino acid starving stress conditions (By similarity).

Co-chaperone of HSPA8/HSC70, it stimulates its ATPase activity. May inhibit the autophosphorylation of EIF2AK2/PKR and the ability of EIF2AK2 to catalyze phosphorylation of the EIF2A.