55Mn-ENDOR of the S2-state multiline signal of Photosystem II from Thermosynechococcus elongatus

2008 ◽  
Vol 36 (5) ◽  
pp. 1001-1004 ◽  
Author(s):  
Susanne Pudollek ◽  
Friedhelm Lendzian ◽  
Robert Bittl
Keyword(s):  
Photosystem Ii ◽  
Double Resonance ◽  
Oxygen Evolving Complex ◽  
Electron Nuclear Double Resonance ◽  
Pulse Epr ◽  
S2 State ◽  
Oxygen Evolving

Pulse EPR and 55Mn-ENDOR (electron nuclear double resonance) experiments at 34 GHz (Q-band) were performed on the S2 state of the OEC (oxygen-evolving complex) in PSII (Photosystem II) from Thermosynechococcus elongatus. The ENDOR spectra are discussed with respect to earlier data obtained from X- (9 GHz) and Q-band experiments on PSII preparations from spinach with and without the addition of methanol.

Pulse EPR, 55Mn-ENDOR and ELDOR-detected NMR of the S2-state of the oxygen evolving complex in Photosystem II

2005 ◽  
Vol 84 (1-3) ◽  
pp. 347-353 ◽  
Author(s):  
Leonid Kulik ◽  
Boris Epel ◽  
Johannes Messinger ◽  
Wolfgang Lubitz
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolving Complex ◽  
Pulse Epr ◽  
S2 State ◽  
Oxygen Evolving

scholarly journals Tetranuclear [MnIIIMn3IVO4] Complexes as Spectroscopic Models of the S2 State of the Oxygen Evolving Complex in Photosystem II

2018 ◽  
Vol 140 (49) ◽  
pp. 17175-17187 ◽  
Author(s):  
Heui Beom Lee ◽  
Angela A. Shiau ◽  
Paul H. Oyala ◽  
David A. Marchiori ◽  
Sheraz Gul ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolving Complex ◽  
S2 State ◽  
Oxygen Evolving

Formation of the High-Spin S2 State Related to the Extrinsic Proteins in the Oxygen Evolving Complex of Photosystem II

2020 ◽  
Vol 11 (20) ◽  
pp. 8908-8913
Author(s):  
Shota Taguchi ◽  
Liangliang Shen ◽  
Guangye Han ◽  
Yasufumi Umena ◽  
Jian-Ren Shen ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
High Spin ◽  
Oxygen Evolving Complex ◽  
Extrinsic Proteins ◽  
S2 State ◽  
Oxygen Evolving

scholarly journals Theoretical study of the multiline EPR signal from the S2 state of the oxygen evolving complex of photosystem II

1992 ◽  
Vol 61 (5) ◽  
pp. 1076-1086 ◽  
Author(s):  
Jacques Bonvoisin ◽  
Geneviève Blondin ◽  
Jean-Jacques Girerd ◽  
Jean-Luc Zimmermann
Keyword(s):  
Photosystem Ii ◽  
Theoretical Study ◽  
Oxygen Evolving Complex ◽  
Epr Signal ◽  
S2 State ◽  
Oxygen Evolving

scholarly journals Structural changes correlated with magnetic spin state isomorphism in the S2 state of the Mn4CaO5 cluster in the oxygen-evolving complex of photosystem II

2016 ◽  
Vol 7 (8) ◽  
pp. 5236-5248 ◽  
Author(s):  
Ruchira Chatterjee ◽  
Guangye Han ◽  
Jan Kern ◽  
Sheraz Gul ◽  
Franklin D. Fuller ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Spin State ◽  
Structural Changes ◽  
Oxygen Evolving Complex ◽  
Magnetic Spin ◽  
Spin Isomers ◽  
S2 State ◽  
Oxygen Evolving

Mn XAS indicating different structures in the spin isomers of the S2 state of PSII

scholarly journals Simulations of the 1 H electron spin echo–electron nuclear double resonance and 2 H electron spin echo envelope modulation spectra of exchangeable hydrogen nuclei coupled to the S 2 –state photosystem II manganese cluster

2002 ◽  
Vol 357 (1426) ◽  
pp. 1359-1366 ◽  
Author(s):  
Constantino P. Aznar ◽  
R. David Britt
Keyword(s):  
Photosystem Ii ◽  
Electron Spin ◽  
Spin Echo ◽  
Double Resonance ◽  
Electron Spin Echo ◽  
Oxygen Evolving Complex ◽  
Electron Nuclear Double Resonance ◽  
Paramagnetic Resonance ◽  
Pulsed Epr ◽  
Envelope Modulation

The pulsed EPR methods of electron spin echo envelope modulation (ESEEM) and electron spin echo–electron nuclear double resonance (ESE–ENDOR) are used to investigate the proximity of exchangeable hydrogens around the paramagnetic S 2 –state Mn cluster of the photosystem II oxygen–evolving complex. Although ESEEM and ESE–ENDOR are both pulsed electron paramagnetic resonance techniques, the specific mechanisms by which nuclear spin transitions are observed are quite different. We are able to generate good simulations of both 1 H ESE–ENDOR and 2 H ESEEM signatures of exchangeable hydrogens at the S 2 –state cluster. The convergence of simulation parameters for both methods provides a high degree of confidence in the simulations. Several exchangeable protons–deuterons with strong dipolar couplings are observed. In the simulations, two of the close (≈2.5 Å) hydrogen nuclei exhibit strong isotropic couplings and are therefore most probably associated with direct substrate ligation to paramagnetic Mn. Another two of the close (≈2.7 Å) hydrogen nuclei show no isotropic couplings and are therefore most probably not contained in Mn ligands. We suggest that these proximal hydrogens may be associated with a Ca 2+ –bound substrate, as indicated in recent mechanistic proposals for O 2 formation.

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