Enables chaperone binding activity and tau protein binding activity. Predicted to be involved in several processes, including chaperone cofactor-dependent protein refolding; positive regulation of ATPase activity; and positive regulation of ATPase-coupled calcium transmembrane transporter activity. Predicted to act upstream of or within several processes, including male gamete generation; positive regulation of G2/M transition of mitotic cell cycle; and synaptonemal complex disassembly. Predicted to be located in cell surface; meiotic spindle; and nucleus. Predicted to be part of CatSper complex. Predicted to be active in cytosol; nucleus; and plasma membrane. Orthologous to human HSPA2 (heat shock protein family A (Hsp70) member 2). [provided by Alliance of Genome Resources, Apr 2022]