The adaptability of the ion binding site by the Ag(I)/Cu(I) periplasmic chaperone SilF by Lithgo, RM, Hanževački, M, Harris, G, Kamps, JJAG, Holden, E, Gianga, T-M, Benesch, JL, Jäger, CM, Croft, AK, Hussain, R, Hobman, JL, Orville, AM, Quigley, A, Carr, SB, Scott, DJ