Electron spin-echo envelope modulation (ESEEM) studies of the tyrosyl radical DOF plant photosystem II

R. G. Evelo; S. A. Dikanov; A. J. Hoff

doi:10.1016/0009-2614(89)87201-X

Electron spin-echo envelope modulation (ESEEM) studies of the tyrosyl radical DOF plant photosystem II

R. G. Evelo, S. A. Dikanov, A. J. Hoff

Research output: Contribution to journal › Article › peer-review

Abstract

An electron spin-echo envelope modulation (ESEEM) study has been performed on the tyrosyl radical D· in photosystem II particles in the frequency region 8.6-9.3 GHz. The experimental data show the presence of at least one proton which is easily exchanged by deuterium. The isotropic a_iso) and anisotropic (Tβ) hyperfine interactions of this proton are a_iso=±4 MHz, Tβ=±9 MHz indicative of D· being a neutral tyrosyl radical. The ESEEM data of D· also exhibit a low-frequency modulation the amplitude and the frequency of which are strongly affected by the microwave frequency. Possible origins of this modulation are discussed.

Original language	English (US)
Pages (from-to)	25-30
Number of pages	6
Journal	Chemical Physics Letters
Volume	157
Issue number	1-2
DOIs	https://doi.org/10.1016/0009-2614(89)87201-X
State	Published - Apr 28 1989
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/0009-2614(89)87201-X

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@article{1e1ccfd3f48f4dfa88f4bafc97a3a4cc,

title = "Electron spin-echo envelope modulation (ESEEM) studies of the tyrosyl radical DOF plant photosystem II",

abstract = "An electron spin-echo envelope modulation (ESEEM) study has been performed on the tyrosyl radical D· in photosystem II particles in the frequency region 8.6-9.3 GHz. The experimental data show the presence of at least one proton which is easily exchanged by deuterium. The isotropic aiso) and anisotropic (Tβ) hyperfine interactions of this proton are aiso=±4 MHz, Tβ=±9 MHz indicative of D· being a neutral tyrosyl radical. The ESEEM data of D· also exhibit a low-frequency modulation the amplitude and the frequency of which are strongly affected by the microwave frequency. Possible origins of this modulation are discussed.",

author = "Evelo, {R. G.} and Dikanov, {S. A.} and Hoff, {A. J.}",

note = "Funding Information: We are indebted to Dr. R. de Beer for making the Fourier and cosine transformation programs available to us, and to Dr. L-G. Franz& (University of GGteborg) and Ms. Maaike Nieveen for the preparation of the PS II particles. This work was supported by the Netherlands Foundation for Chemical Research (SON), financed by the Netherlands Organization for Scientific Research (NWO). SAD thanks the Netherlands Organization for Scientific Research (NWO) for supporting his sojourn at the University of Leiden and the Department of Biophysics, University of Leiden, for its hospitality.",

year = "1989",

month = apr,

day = "28",

doi = "10.1016/0009-2614(89)87201-X",

language = "English (US)",

volume = "157",

pages = "25--30",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier",

number = "1-2",

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T1 - Electron spin-echo envelope modulation (ESEEM) studies of the tyrosyl radical DOF plant photosystem II

AU - Evelo, R. G.

AU - Dikanov, S. A.

AU - Hoff, A. J.

N1 - Funding Information: We are indebted to Dr. R. de Beer for making the Fourier and cosine transformation programs available to us, and to Dr. L-G. Franz& (University of GGteborg) and Ms. Maaike Nieveen for the preparation of the PS II particles. This work was supported by the Netherlands Foundation for Chemical Research (SON), financed by the Netherlands Organization for Scientific Research (NWO). SAD thanks the Netherlands Organization for Scientific Research (NWO) for supporting his sojourn at the University of Leiden and the Department of Biophysics, University of Leiden, for its hospitality.

PY - 1989/4/28

Y1 - 1989/4/28

N2 - An electron spin-echo envelope modulation (ESEEM) study has been performed on the tyrosyl radical D· in photosystem II particles in the frequency region 8.6-9.3 GHz. The experimental data show the presence of at least one proton which is easily exchanged by deuterium. The isotropic aiso) and anisotropic (Tβ) hyperfine interactions of this proton are aiso=±4 MHz, Tβ=±9 MHz indicative of D· being a neutral tyrosyl radical. The ESEEM data of D· also exhibit a low-frequency modulation the amplitude and the frequency of which are strongly affected by the microwave frequency. Possible origins of this modulation are discussed.

AB - An electron spin-echo envelope modulation (ESEEM) study has been performed on the tyrosyl radical D· in photosystem II particles in the frequency region 8.6-9.3 GHz. The experimental data show the presence of at least one proton which is easily exchanged by deuterium. The isotropic aiso) and anisotropic (Tβ) hyperfine interactions of this proton are aiso=±4 MHz, Tβ=±9 MHz indicative of D· being a neutral tyrosyl radical. The ESEEM data of D· also exhibit a low-frequency modulation the amplitude and the frequency of which are strongly affected by the microwave frequency. Possible origins of this modulation are discussed.

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Electron spin-echo envelope modulation (ESEEM) studies of the tyrosyl radical DOF plant photosystem II

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