The function of DNAJB2 (DnaJ heat shock protein family (Hsp40) member B2, ENSG00000135924) is as follows. Functions as a co-chaperone, regulating the substrate binding and activating the ATPase activity of chaperones of the HSP70/heat shock protein 70 family (PubMed:22219199, PubMed:7957263). In parallel, also contributes to the ubiquitin-dependent proteasomal degradation of misfolded proteins (PubMed:15936278, PubMed:21625540). Thereby, may regulate the aggregation and promote the functional recovery of misfolded proteins like HTT, MC4R, PRKN, RHO and SOD1 and be crucial for many biological processes (PubMed:12754272, PubMed:20889486, PubMed:21719532, PubMed:22396390, PubMed:24023695). Isoform 1 which is localized to the endoplasmic reticulum membranes may specifically function in ER-associated protein degradation of misfolded proteins (PubMed:15936278). {ECO:0000269|PubMed:12754272, ECO:0000269|PubMed:15936278, ECO:0000269|PubMed:20889486, ECO:0000269|PubMed:21625540, ECO:0000269|PubMed:21719532, ECO:0000269|PubMed:22219199, ECO:0000269|PubMed:22396390, ECO:0000269|PubMed:24023695, ECO:0000269|PubMed:7957263}.