Volume 137, No. 6, June 6, 2011. Pages 479–488.

Please note that Yu et al. (2010. J. Amer. Chem. Soc. 132:10847–10856) cited the wrong LJ parameter set used for Na+ and K+ ions (Andersen, O.S., and B. Roux, personal communication). In their study, Yu et al. (2010) did not use the parameter set from Beglov and Roux (1994. J. Chem. Phys. 100:9050–9063), but instead the parameter set from Noskov and Roux (2008. J. Mol. Biol. 377:804–818). These two parameter sets yield different K+→Na+ hydration free energy differences. While the parameters from Beglov and Roux (1994) yield a value of −20.7 kcal/mol, the parameters from Noskov and Roux (2008) yield a value of −18.6 kcal/mol. This consequently modifies two entries in Table I (marked by asterisks below), but has no impact on the published conclusions.