Correction for Schwartz et al., Investigation of protein conformation and interactions with salts via X-ray absorption spectroscopy

CHEMISTRY Correction for “Investigation of protein conformation and interactions with salts via X-ray absorption spectroscopy,” by Craig P. Schwartz, Janel S. Uejio, Andrew M. Duffin, Alice H. England, Daniel N. Kelly, David Prendergast, and Richard J. Saykally, which appeared in issue 32, August 10, 2010, of Proc Natl Acad Sci USA (107:14008–14013; first published July 26, 2010; 10.1073/pnas.1006435107).

The authors note that the results of their article indicated that sulfite interacts more directly with the peptide than does bromide. These results do not refute nor contradict the work of Cremer and coworkers involving the interactions of anions with poly(N-isopropylacrylamide) (1). In the case of Cremer's work, a direct Hofmeister series is followed. For triglycine, however, at least a partially reversed Hofmeister series might be expected (2, 3), because this molecule contains a site of positive charge.