8.2 Chaperones may be required for protein folding System Function HSp70 H sp70(Dnak) ATPase H sp40(DnaJ) stimulates ATPase GrpE (GrpE) Nucleotide exchange factor Chaperonin H sp60(GroEL)Foms two heptameric rings Hsp10 (GroES)Foms cap Figure 8.5 Chaperone families have eukaryotic and bacterial counterparts(named in parentheses) 消当Figure 8.5 Chaperone families have eukaryotic and bacterial counterparts (named in parentheses). 8.2 Chaperones may be required for protein folding