Two-dimensional 15N-1H-HSQC spectra from CaM-MA.
(a) 15N-MA only;
(b) 15N-MA-CaM complex in
10 mM NaPO4 (pH 5.5), 5 mM CaCl2, 1 mM TCEP;
(c and d) the 15N-MA-CaM complex after titration with either KCl (to
500 mM) or EGTA (10 mM), respectively, showing many peaks corresponding to
folded MA have been restored; (e) 15N-MA in 6 M GuHCl, and (f) 15N-MA after removal of 6 M GuHCl.