Formation and decay of P680 (PD1–PD2)+PheoD1− radical ion pair in photosystem II core complexes
نویسندگان
چکیده
منابع مشابه
Radical pair state in photosystem II.
A stable light-induced EPR signal is reported in photosystem II particles and in chloroplasts at 5 K. Characteristic spectral features indicate that the signal arises from dipole-dipole interactions of a radical pair triplet state. From its dependence on potential, its relationship to the spin-polarized triplet state, and the redox state of the pheophytin acceptor (Ph) and because it is present...
متن کاملPhotosystem II electron transfer: the manganese complex to P680.
bridges in transition metal clusters are unreactive as a class, they would require special activation if they were to be involved in oxidations or 0-0 bond formation. We propose that the unusual electronic configuration of the Mn, cluster of the WOC is an expression of this activation. Formation of the activated (dn)3(dx2-,2)' electron configuration may also be explained if the Mn"' ions have o...
متن کاملRapid formation of the stable tyrosyl radical in photosystem II.
Two symmetrically positioned redox active tyrosine residues are present in the photosystem II (PSII) reaction center. One of them, TyrZ, is oxidized in the ns-micros time scale by P680+ and reduced rapidly (micros to ms) by electrons from the Mn complex. The other one, TyrD, is stable in its oxidized form and seems to play no direct role in enzyme function. Here, we have studied electron donati...
متن کاملHigh-spin supramolecular pair of Mn(II)/thiazyl radical complexes.
The Mn(hfac)(2) complex of the paramagnetic 4-(benzoxazol-2'-yl)-1,2,3,5-dithiadiazolyl ligand is reported (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato-). The Mn(ii) and radical ligand spins are coupled antiferromagnetically (AF) in the coordination complex. Short sulfur-oxygen contacts between molecules provide an efficient pathway for AF coupling between the radical ligand of one molecule an...
متن کاملNew Heterobimetallic Ion-pair Complexes of Ni(II) with Mn(II), Co(II) and Zn(II)
Some heterobimetallic ion-pair complexes of Ni(II) with Mn(II), Co(II) and , Zn (II) using 1,10-phenanthroline (phen) and 1-tert-butylimidazole-2-thione (tm) ligands were prepared by co-crystallization of Ni(II)-phen cationic complex and Cl / tm containing anionic complex in acetonitrile / methanol solvent. The [Ni(phen)3][MnCl4] (1) contains two molecule of acetonitrile and [Ni(phen)3] 2+ is h...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2014
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2014.01.026