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. Author manuscript; available in PMC: 2011 Jul 6.
Published in final edited form as: Curr Opin Struct Biol. 2003 Dec;13(6):716–721. doi: 10.1016/j.sbi.2003.10.011

Figure 4.

Figure 4

Spectral simulations showing the effect on EPR spectra of varying the angle between the interspin vector connecting the paramagnetic centers and the g||-axis of the Co2+. In the simulations, the g-values for Co2+are g⊥ = 2.25 and g|| = 2, and g = 2 for the substrate-derived radical. The 59Co nuclear hyperfine splittings are A⊥ = 5 G and A|| =115 G. The zero-field splitting parameters, D and E, were set to 125 G and 25 G, respectively, and the exchange coupling constant, J, was held fixed at 1750 G. The values for the zero-field splitting parameters and the exchange coupling constant are consistent with an interspin distance of approximately 6 Å.