Figure 9.
MD simulations to identify stable MRA78T-ATP and MRA78T-ADP conformations. (A, B) FELs were evaluated for MRA78T-ATP (A) and MRA78T-ADP (B). Analyses have been carried out using the projection of concatenated trajectories along the first and the second principal components (PC1 and PC2) as reaction coordinates. Basins are progressively numbered according to their energetic stability. Energy values are reported in kJ/mol. (C, D) The most energetically favoured conformations shown are derived from the FELs and cluster analysis for MRA78T-ATP (C) (corresponding to basin II in panel A), and MRA78T-ADP (D) (corresponding to basin I in panel B). Rad50 subunits are in red and yellow; Mre11 subunits are in cyan and green. Close-up views of the nucleotide binding site are shown at the bottom. Nucleotides and residues interacting with ATP/ADP are shown as sticks; each residue is colored according to the chain it belongs to.