Interpretation of the Mössbauer spectra of the four-iron ferredoxin from Bacillus stearothermophilus.
Interpretation of the Mössbauer spectra of the four-iron ferredoxin from Bacillus stearothermophilus.
复制标题
嗜热脂肪芽孢杆菌四铁铁氧还蛋白穆斯堡尔谱的解释。
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
James D. Rush
中科院分区：
文献类型：
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作者：
Peter Middleton;D. Dickson;C. Johnson;James D. Rush
氧化和还原的铁氧还蛋白从嗜热脂肪芽孢杆菌的穆斯堡尔谱进行了分析，使用计算机拟合从自旋哈密顿理论光谱。一组一致的参数，从拟合得到的光谱在很宽的范围内的温度和磁场。这些结果被解释在一个模型的活性中心，这是一致的，其电子和磁性在两个氧化还原状态。在氧化中心的模型中，所有四个铁原子基本上具有相同的价态，介于三价铁和亚铁之间，一对自旋向上，另一对自旋向下。在还原过程中，额外的电子主要流向一对铁原子，这对铁原子变成亚铁，而另一对铁原子基本上保持不变。使用这个模型，它是可能的，以获得单个铁原子的自旋哈密顿参数和耦合中心之间的关系。这可以进一步了解所观察到的电子顺磁共振和穆斯堡尔谱之间的关系。
The Mössbauer spectra of both oxidized and reduced ferredoxin from Bacillus stearothermophilus have been analysed using computer fits to theoretical spectra obtained from a spin Hamiltonian. A consistent set of parameters was obtained from fits to spectra obtained over a wide range of temperature and magnetic field. These results are interpreted in terms of a model for the active centre which is consistent with its electronic and magnetic properties in both redox states. In the model for the oxidized centre all four iron atoms have essentially the same valence, intermediate between ferric and ferrous, with one pair spin-up and the other pair spin-down. On reduction the extra electron goes predominantly to one pair of iron atoms which become ferrous with the other pair remaining substantially unchanged. Using this model it is possible to obtain relationships between the spin Hamiltonian parameters for individual iron atoms and those for the coupled centre. This can give further insight into the relation between the observed electron paramagnetic resonance and Mössbauer spectra.