Erratum to: J Biol Inorg Chem (2013) 18:411–418 DOI 10.1007/s00775-013-0985-5

In the original publication of the article, the equation for fitting chemical denaturation included an error (Page 413). The corrected equation is given below.

$$ MRE = \frac{{MRE_{f} + MRE_{u1} e^{{ - \frac{{\Updelta G_{1} - m_{1} [D]}}{RT}}} }}{{1 + e^{{ - \frac{{\Updelta G_{1} - m_{1} [D]}}{RT}}} }} + \frac{{MRE_{f1} + MRE_{u} e^{{ - \frac{{\Updelta G_{2} - m_{2} [D]}}{RT}}} }}{{1 + e^{{ - \frac{{\Updelta G_{2} - m_{2} [D]}}{RT}}} }} $$

The chemical denaturation data in the published article were fit to the correct equation given above.