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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Electron paramagnetic resonance spectroscopy of thyroid peroxidase.

Thyroid peroxidase was isolated from porcine thyroids by two methods. Limited trypsin proteolysis was employed to obtain a cleaved enzyme, and affinity chromatography was used to isolate intact thyroid peroxidase. Enzyme isolated by both methods was used in the examination of the heme site of native thyroid peroxidase and its complexes by EPR spectroscopy. Intact thyroid peroxidase showed a homogeneous high-spin EPR signal with axial symmetry, in contrast to the rhombic EPR signal of native lactoperoxidase. Reaction of cyanide or azide ion with native thyroid peroxidase resulted in the loss of the axial EPR signal within several hours. The EPR spectroscopy of the nitrosyl adduct of ferrous thyroid peroxidase exhibited a three-line hyperfine splitting pattern and indicated that the heme-ligand structure of thyroid peroxidase is significantly different from that of lactoperoxidase.[1]

References

  1. Electron paramagnetic resonance spectroscopy of thyroid peroxidase. Lukat, G.S., Jabro, M.N., Rodgers, K.R., Goff, H.M. Biochim. Biophys. Acta (1988) [Pubmed]
 
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