Fig. 2.

Rep40–ADP interactions. (a) The nucleotide binding pocket in Rep40. (b) Stereoview of the active site. The dotted lines represent hydrogen bonds; green spheres represent water molecules. Residues T337, T338, G339, K340, T341, and N342 are located in the P-loop, and residues D457, G459, K460, and V461 are located in the NB-loop. (c) Electrostatic surface potential of the Rep40–ADP molecule. Blue and red represent regions of positive and negative potential, respectively, as calculated in grasp (68). (d) Superposition of the ADP molecule in a trans-gauche conformation from the structure of NSF-D2 (cyan). Rep40 is shown as a surface representation (salmon).