XFEL Crystal Structures of Peroxidase Compound II

XFEL Crystal Structures of Peroxidase Compound II
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过氧化物酶化合物 II 的 XFEL 晶体结构

DOI:
10.1002/ange.202103010
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Kwon H
Kwon H
中科院分区:
--
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作者:
Kwon H

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在所有的血红素酶中,氧的激活都需要形成高氧化态的铁,通常被称为铁基血红素。有两个已知的中间体:化合物I和化合物II。铁基血红素的性质--以及它是FeIV=O还是FeIV-OH物种--对于控制不同组的血红素酶的反应活性很重要。化合物I的最新证据表明,铁基血红素是一种未质子化的FeIV=O物种。对于化合物II,铁血红素的性质并不是明确确定的。在这里,我们报告了使用SACLA的X射线自由电子激光收集的细胞色素过氧化物酶和抗坏血酸过氧化物酶的化合物II中间体的1.06 ?和1.50 ?的晶体结构。这些结构揭示了这两种过氧化物酶之间的差异。CCP的铁氧键长度(1.76 ?)明显短于APX(1.87 ?)。结果表明,在密切相关的过氧化物酶中,铁基物种在化合物I和化合物II之间存在很好的调谐。我们认为,这种微调与质子输送到血红素的功能需求有关。
Oxygen activation in all heme enzymes requires the formation of high oxidation states of iron, usually referred to as ferryl heme. There are two known intermediates: Compound I and Compound II. The nature of the ferryl heme—and whether it is an FeIV=O or FeIV‐OH species—is important for controlling reactivity across groups of heme enzymes. The most recent evidence for Compound I indicates that the ferryl heme is an unprotonated FeIV=O species. For Compound II, the nature of the ferryl heme is not unambiguously established. Here, we report 1.06 Å and 1.50 Å crystal structures for Compound II intermediates in cytochromecperoxidase (CcP) and ascorbate peroxidase (APX), collected using the X‐ray free electron laser at SACLA. The structures reveal differences between the two peroxidases. The iron‐oxygen bond length in CcP (1.76 Å) is notably shorter than in APX (1.87 Å). The results indicate that the ferryl species is finely tuned across Compound I and Compound II species in closely related peroxidase enzymes. We propose that this fine‐tuning is linked to the functional need for proton delivery to the heme.
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发表时间: 2012-08-08
影响因子: 15
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影响因子: --
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过氧化物酶中间体中氧铁 (IV) 卟啉阳离子自由基和氧铁 (IV) 血红素的共振拉曼光谱。
DOI: 10.1016/j.jinorgbio.2006.01.008
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影响因子: --
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