Synonyms:DJ 2, DjA1, DnaJ protein homolog 2, DNAJ2, DNAJA1, hDJ 2, HDJ2, Heat shock 40 kDa protein 4, Heat shock protein J2, HSDJ, HSJ 2, HSJ2, HSPF4, Human DnaJ protein 2 Background:Co-chaperone for HSPA8/Hsc70(PubMed:10816573). Stimulates ATP hydrolysis, but not the folding of unfolded proteins mediated by HSPA1A(in vitro)(PubMed:24318877). Plays a role in protein transport into mitochondria via its role as co-chaperone. Functions as co-chaperone for HSPA1B and negatively regulates the translocation of BAX from the cytosol to mitochondria in response to cellular stress, thereby protecting cells against apoptosis(PubMed:14752510). Promotes apoptosis in response to cellular stress mediated by exposure to anisomycin or UV(PubMed:24512202).