Electron Paramagnetic Resonance of Single Crystal Oxycobaltmyoglobin and Deoxycobaltmyoglobin
AUTOR(ES)
Chien, James C. W.
RESUMO
Single crystals of oxycobaltmyoglobin and deoxycobaltmyoglobin have been prepared and found to be isomorphous. The paramagnetic resonance spectra of deoxycobaltmyoglobin yield gxx = 2.330, gyy = 2.323, gzz = 2.028 with the z-axis parallel to the “heme” normal. The ACo and g tensors share the same principal axes with|ACo∥| = 79 G and|ACo[unk]| = 6 G. A value of AN = 17.5 G was also obtained for the ε-N atom of the F8 histidine. There are two paramagnetic species in oxycobaltmyoglobin having apparently identical g-tensors (gξξ = 2.083, gηη = 2.006, and gζζ = 1.989) but different ACo-tensors. Furthermore, g values ACo do not share the same principal axes. The ACo-values for one of the species are (Axx = 16.7 G, Ayy = 5.95 G, Azz = 9.3 G), they are all 40% larger for the other species. The two species are oriented 90° to each other in the crystal. The results from electron paramagnetic resonance studies are consistent with a π-bounded structure for CoMbO2.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=389644Documentos Relacionados
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