Enables chaperone binding activity and ubiquitin protein ligase binding activity. Involved in several processes, including negative regulation of protein refolding; negative regulation of ubiquitin-protein transferase activity; and regulation of inclusion body assembly. Predicted to be located in inclusion body; mitochondrion; and perinuclear region of cytoplasm. Predicted to be active in cytosol; membrane; and nucleus. Orthologous to human BAG5 (BAG cochaperone 5). [provided by Alliance of Genome Resources, Apr 2022]