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

✍ Scribed by R.G. Evelo; S.A. Dikanov; A.J. Hoff

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 538 KB
Volume: 157
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(89)87201-x

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✦ Synopsis

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 (aim) and anisotropic (T, ) hyperline interactions of this proton are ai-= 24 MHz, TI = T 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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