The magnetic susceptibility of cytochrome oxidase in the 4.2-1.5 K range.
Sixteen low temperature measurements on eight independent cytochrome oxidase samples from two separate laboratories have yielded magnetic susceptibility data compatible with a model of spin-coupled iron and copper ions, as presented in the preceding paper (Tweedle, M.F., Wilson, L.J., García-Iñiguez, L., Babcock, G. T., and Palmer, G. (1978) J. Biol. Chem. 253, 8065-8071). The data in the 1.5-77 K range match those attained at higher temperatures and the predictions of the spin-coupled model. Measurements on reduced samples confirm the high spin nature of one iron atom. No obvious uncoupling of the antiferromagnetic Fe-Cu interaction is detected in partly reduced samples.
D003300:Copper; D004578:Electron Spin Resonance Spectroscopy; D003576:Electron Transport Complex IV; D005615:Freezing; D007501:Iron; D008280:Magnetics; D010084:Oxidation-Reduction
D003300:Copper; D007501:Iron; D003576:Electron Transport Complex IV