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ClpB disaggregase, in particular, ClpB3 from A. thaliana. ClpB3 was produced recombinantly in Escherichia coli and affinity-purified to near homogeneity. ClpB3 forms a hexameric complex in the presence of MgATP and displays intrinsic ATPase activity. We demonstrate that ClpB3 has ATPase activity in a wide range of pH and temperature values and is particularly resistant to heat. ClpB3 specifically targets unstructured polypeptides and mediates the reactivation of heat-denatured model substrates without the aid of the Hsp70 system. Overall,