Figure 1.
Illustration of ATP binding pocket differences. (A) Molecular model of adenosine diphosphate (ADP) in the adenosine triphosphate (ATP) binding pocket of human (2FWZ) Hsp90 (HsHsp90). (B) Molecular model of ADP in the ATP binding pocket of P. falciparum (3K60) Hsp90 (PfHsp90). (C) Molecular model of ADP in the ATP binding pocket of E. histolytica Hsp90 (EhHsp90) (based on PfHsp90 template: 3K60). (D) Summary of the unique residues in the ATP binding pockets of HsHsp90, PfHsp90 and EhHsp90. Please note that these residues are at conserved positions in the 3D model. These residues were mutated by site-directed mutagenesis to examine alterations in binding specificity.