Protein-ligand interactions, and energetics. A, Total number of hydrogen bond interactions, and contacts, formed between ligands and GGPPS. A contact is formed whenever the ligand is less than 7Å from a protein atom. B, Coulombic, van der Waals and hydrophobic interaction energies (solvent-accessible surface area, SASA) computed for each ligand. Zoledronate in turquoise, BPH-703 in pink, GGPP in tan and BPH-1185 in green.