... (A˚2)Overall 18 .1 18.3Protein (chain A, B) 16 .2, 16 .5 16 .4, 16 .3Ligand 21. 8, 56.0 34.2, 43.2Solvent 26.5 25.6rmsdBond length (A˚) 0.007 0.007Bond angle (°) 1. 439 1. 113 PDB codes 2xog ... variants at Lys7, Arg10, andLys66. Biochemistry 37, 12 1 21 12 132. 31 Anderson DG, Hammes GG & Walz FG Jr (19 68)Binding of phosphate ligands to ribonuclease A.Biochemistry 7, 16 37 16 45.32 Meadows ... 2 010 , revised29 November 2 010 , accepted 1 December2 010 )doi :10 .11 11/ j .17 42-4658.2 010 .07976.xMolecular probes are useful for both studying and controlling the functions of enzymes and other proteins....