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Lipoxygenases catalyze the formation of fatty acid hydroperoxides, products used in further biochemical reactions leading to normal and pathological cell functions. X-ray structure analysis and spectroscopy have been applied to elucidate the mechanism of lipoxygenases. Two X-ray structures of soybean lipoxygenase-1 reveal the side chains of three histidines and the COO- of the carboxy terminus as ligands to the catalytically important iron atom. The enzyme contains a novel three-turn pi-helix near the iron center. Spectroscopic studies, including electron magnetic resonance, X-ray absorption spectroscopy, infrared circular dichroism, and magnetic circular dichroism, have been applied to compare lipoxygenases from varied sources and with different substrate positional specificity.
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Betty J. Gaffney (1996) studied this question.
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