首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >APPLICATION OF 129I MOSSBAUER EFFECT TO BIOLOGICAL SYSTEMS: STUDIES WITH HEME MODELS
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APPLICATION OF 129I MOSSBAUER EFFECT TO BIOLOGICAL SYSTEMS: STUDIES WITH HEME MODELS

机译:129I MOSSBAUER效应在生物系统中的应用:血红素模型研究

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摘要

The Mossbauer effect associated with 129I, 125Te, and 57Fe has been applied to investigate structural properties of the axial ligands in ferric-high spin hematoheme-I, hematoheme-Te, and hematoheme-histidine-iodide. The magnitude and sign of the 129I quadrupole coupling constant (e2qQ) and the isomer shift, as deduced from the Mossbauer effect spectra, are consistent with an axial, s-p hybridized bond of overwhelming σ-character. Identical coupling constant (e2qQ(127I) = -1826 ± 3 MHz) were measured for both heme-I and hematoheme-histidine-iodide. Implications of this result to the nature of ferric-high spin heme-histidine complexing are discussed. A stable heme 125Te species formed in the electron-capture decay of heme-125I is observed, and structural properties of this singly bonded telluride ligand are discussed.
机译: 129 I, 125 Te和 57 Fe的Mossbauer效应已被用于研究高铁离子中轴向配体的结构性质旋转血红素-I,血红素-Te和血红素-组氨酸-碘。由Mossbauer效应谱推导的 129 I四极偶合常数(e 2 qQ)的大小和正负号以及异构体位移与轴向sp压倒性的σ字符的杂化键。测定血红素I和血红素-组氨酸碘的相同的耦合常数(e 2 qQ( 127 I)= -1826±3 MHz)。讨论了该结果对高铁自旋血红素-组氨酸配合物的性质的影响。观察到在血红素- 125 I的电子捕获衰变中形成的稳定的血红素 125 Te物种,并讨论了这种单键碲化物配体的结构性质。

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