Enables several functions, including Hsp70 protein binding activity; chaperone binding activity; and dATP binding activity. Involved in chaperone cofactor-dependent protein refolding and negative regulation of protein refolding. Located in cytosol. Part of protein-containing complex. Orthologous to several human genes including ST13 (ST13 Hsp70 interacting protein). [provided by Alliance of Genome Resources, Apr 2022]