Fig. 4From: Role of magnesium ions in the reaction mechanism at the interface between Tm1631 protein and its DNA ligandEnergy profile (red) for the QM/MM calculation without ions with the values for the energy reported on y1 axis. Values for distances between atoms Cyt6 03′—P (3DR7) (green) and water 1863 OH2–P (3DR7) (blue) are marked on the y2 axis. The distances to important amino acids are collected in Additional file 1: Table S2Back to article page