Hsp70 proteins are highly conserved proteins induced by heat shock and other stress conditions. An ATP-binding domain of human Hsp70 protein has been crystallized in two major morphological forms at pH 7.0 in the presence of PEG 8000 and CaCl2. Both ...
Hsp70 proteins are highly conserved proteins induced by heat shock and other stress conditions. An ATP-binding domain of human Hsp70 protein has been crystallized in two major morphological forms at pH 7.0 in the presence of PEG 8000 and CaCl2. Both crystal forms belong to the orthorhombic space group P212121, but show no resemblance in unit-cell parameters. Analysis of the crystal structures for both forms shows a 1-2 A shift of one of the subdomains of the protein. This conformational change could reflect a 'natural' flexibility of the protein which might be relevant to ATP binding and may facilitate the interaction of other proteins with Hsp70 protein.
Related Citations: 
Human Hsp70 Molecular Chaperone Binds Two Calcium Ions within the ATPase Domain Sriram, M.,Osipiuk, J.,Freeman, B.C.,Morimoto, R.I.,Joachimiak, A. (1997) Structure 5: 403
Three-Dimensional Structure of the ATPase Fragment of a 70K Heat-Shock Cognate Protein Flaherty, K.M.,Deluca-Flaherty, C.,Mckay, D.B. (1990) Nature 346: 623
Organizational Affiliation: 
Argonne National Laboratory, Center for Mechanistic Biology and Biotechnology, 9700 S. Cass Avenue, Argonne, IL 60439, USA.