Pure Appl. Chem., 2004, Vol. 76, No. 2, pp. 321-333
http://dx.doi.org/10.1351/pac200476020321
Copper(II) proteins are amenable for NMR investigations
Abstract:
The possibility of investigating copper proteins by
nuclear magnetic resonance is here treated. It is shown that the solution
structure and dynamic information can be obtained on Type I Cu(II) proteins,
which have a relatively short electron relaxation time (τS
= 10-10 s). The experimental approach,
in this case, is routine, although tailored for fast-relaxing nuclei.
In the case of Type II Cu(II) proteins, when the electron relaxation
times are larger (τS
= 10-8 - 10-9
s) and proton linewidths are broadened beyond detectable limits, heteronuclear
13C spectra with direct detection can
be used and the solution structure can again be obtained.
In this review, it is shown that Cu(II) proteins are now amenable
for NMR investigation, the size being the only limit as in diamagnetic
proteins.