Enables Hsp70 protein binding activity; polyubiquitin modification-dependent protein binding activity; and proteasome binding activity. Involved in several processes, including animal organ development; protein stabilization; and synaptonemal complex assembly. Acts upstream of or within negative regulation of apoptotic process. Located in cytosol and nucleus. Is expressed in palatal shelf epithelium. Human ortholog(s) of this gene implicated in lung non-small cell carcinoma and osteoarthritis. Orthologous to human BAG6 (BAG cochaperone 6). [provided by Alliance of Genome Resources, Apr 2022]