Pulsed EPR measurement of the distance between P680+· and QA−· in photosystem II
- 8 September 1997
- journal article
- Published by Wiley in FEBS Letters
- Vol. 414 (2) , 454-456
- https://doi.org/10.1016/s0014-5793(97)01054-5
Abstract
Out-of-phase electron spin echo envelope modulation (ESEEM) spectroscopy was used to determine the distance between the primary donor radical cation P680 +· and the quinone acceptor radical anion QA −· in iron-depleted photosystem II in membrane fragments from spinach that are deprived of the water oxidizing complex. Furthermore, a lower limit for the distance between the oxidized tyrosine residue Yz of polypeptide D1 and QA −· could be estimated by a comparison of data gathered from samples where the electron transfer from Yz to P680 +· is either intact or blocked by preillumination in the presence of NH2OH.Keywords
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