This family consists of the C terminal region of the DnaJ protein. It is always found associated with pfam00226 and pfam00684. DnaJ is a chaperone associated with the Hsp70 heat-shock system involved in protein folding and renaturation after stress. The two C-terminal domains CTDI and CTDII, both incorporated in this family are necessary for maintaining the J-domains in their specific relative positions. Structural analysis of Structure 1nlt shows that pfam00684 is nested within this DnaJ C-terminal region.