Photosystem II of green plants: on the possible role of retarded protonic relaxation in water oxidation

Autor(en): Mulkidjanian, AY
Stichwörter: Biochemistry & Molecular Biology; Biophysics; DIFFERENCE SPECTRA; ELECTRON-TRANSFER; EVOLUTION; MODEL; OXIDIZING SIDE; oxygen evolution; P680; PHOTOSYNTHETIC REACTION-CENTER; photosystem II; proton transfer; REACTION CENTER COMPLEX; redox potential; relaxation; TEMPERATURE; TOPOLOGY; water oxidation
Erscheinungsdatum: 1999
Herausgeber: ELSEVIER SCIENCE BV
Journal: BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
Volumen: 1410
Ausgabe: 1
Startseite: 1
Seitenende: 6
Zusammenfassung: 
Photosystem II (PSII) of green plants and cyanobacteria uses energy of light to oxidize water and to produce oxygen. The available estimates of the oxidizing potential of P-680(+), the primary donor of PSII, yield value of about 1.15 V. Two main factors are suggested to add up and engender this high oxidizing potential, namely: (1) the electrostatic influence dominated by Arg-181 of the D2 subunit which elevates the oxidizing potential of P680(+) up to 1 V, some 0.1 V above the E-m value of a hydrogen-bonded chlorophyll a; and (2) the dynamic component of 0.10-0.15 V due to the experimentally demonstrated retarded protonic relaxation at the P-680 site. (C) 1999 Elsevier Science B.V. All rights reserved.
ISSN: 00052728
DOI: 10.1016/S0005-2728(98)00174-1

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