P. Wittungstafshede et al., FOLDING OF DEOXYMYOGLOBIN TRIGGERED BY ELECTRON-TRANSFER, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 102(28), 1998, pp. 5599-5601
The met and deoxy forms of sperm whale myoglobin (Mb) can be unfolded
by guanidine hydrochloride (GuHCl). Electronic absorption and circular
dichroism spectroscopic measurements show that folded deoxyMb is more
stable than the folded met protein. Laser excitation of NADH generate
s species that rapidly reduce unfolded metMb, triggering the formation
of folded deoxyMb in less than 10 ms (pH 7.0, 2.5 to 3 M GuHCl, 20 de
grees C). At comparable reaction driving forces (similar to 10 kJ/mol)
, deoxyMb folds much faster than reduced cytochrome c.