Determination of the g-matrix orientation in flavin radicals by high-rield/high-frequency electronnuclear double resonance
Determination of the g-matrix orientation in flavin radicals by high-rield/high-frequency electronnuclear double resonance
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DOI：
10.1002/mrc.1667
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发表时间：
2005-11-01
影响因子：
2
通讯作者：
Weber, S
中科院分区：
文献类型：
--
作者：
Kay, CWM;Schleicher, E;Weber, S
A high-microwave-frequency/high-magnetic-field pulsed electron-nuclear double resonance (ENDOR) study performed at 94 GHz on the flavin semiquinone cofactor of Xenopus laevis (6-4) photolyase in its neutral radical state is presented. Although the principal values of the flavin radical's g-matrix are not fully resolved in the 94-GHz EPR spectrum in a nonoriented sample, the orientation of the principal axes of g is obtained by exploiting the orientation selection of the proton ENDOR signals from the methyl protons at C-8 alpha and the deuteron ENDOR signals from D-5 in an enzyme sample in deuterated buffer. This procedure for assigning the orientation of g relative to the molecular frame makes use of commercially available ENDOR instrumentation without the necessity to perform single-crystal studies. Copyright (c) 2005 John Wiley & Sons, Ltd.
