Coupled Methyl Group Rotation in FMN Radicals Revealed by Selective Deuterium Labeling.
Coupled Methyl Group Rotation in FMN Radicals Revealed by Selective Deuterium Labeling.
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选择性氘标记揭示 FMN 自由基中的耦合甲基旋转
DOI:
10.1021/acs.jpcb.9b11331
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Schleicher
中科院分区:
文献类型:
--
作者:
Richard;Illarionov;Heidinger;Lorenz;Ryu-Ryun;Fischer;Markus;Stefan;Bacher;Adelbert;Robert;Schleicher
Flavin semiquinones are common intermediate redox states in flavoproteins, and thus, knowledge of their electronic structure is essential for fully understanding their chemistry and chemical versatility. In this contribution, we use a combination of high-field electron nuclear double resonance spectroscopy and selective deuterium labeling of flavin mononucleotide (FMN) with subsequent incorporation as cofactor into a variantAvena sativaLOV domain to extract missing traits of the electronic structure of a protein-bound FMN radical. From these experiments, precise values of small proton hyperfine and deuterium nuclear quadrupole couplings could be extracted. Specifically, isotropic hyperfine couplings of −3.34, −0.11, and +0.91 MHz were obtained for the protons H(6), H(9), and H(7α), respectively. These values are discussed in the light of specific protein–cofactor interactions. Furthermore, the temperature behavior of the H(7α) methyl-group rotation elicited by its energy landscape was analyzed in greater detail. Pronounced interplay between the two methyl groups at C(7) and C(8) of FMN could be revealed. Most strikingly, this rotational behavior could be modulated by selective deuterium editing.
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影响因子:
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