In cooperation with other chaperones, Hsp70s are key components that facilitate folding of de novo synthesized proteins, assist translocation of precursor proteins into organelles, and are responsible for degradation of damaged protein under stress conditions. Interacts with GDP-mannose 3,5-epimerase and SGT1B (via SGS domain). Binds to the deubiquitinating enzyme AMSH3. Interacts with WPP1. Interacts with DEK3 (PubMed:25387881). Down-regulated during seed maturation. Up-regulated during germination. By heat shock and by cold. Up-regulated by virus infection. Belongs to the heat shock protein 70 (TC 1.A.33) family. DnaK subfamily.