The ClpX heat shock protein of Escherichia coli is a member of the universally conserved Hsp100 family of proteins, and possesses a putative zinc finger motif of the C4 type. This presumed zinc binding domain is found at the N-terminus of the ClpX protein. ClpX is an ATPase which functions both as a substrate specificity component of the ClpXP protease and as a molecular chaperone. The molecular function of this domain is now known.

1: Structure-function analysis of the zinc-binding region of the Clpx molecular chaperone. Banecki B, Wawrzynow A, Puzewicz J, Georgopoulos C, Zylicz M; J Biol Chem 2001;276:18843-18848. PMID:11278349