Analysis of dipolar and exchange interactions between manganese and tyrosine Z in the S2Y(sub Z)* state of acetate-inhibited photosystem II via EPR spectral simulations at X- and Q-brands

Article Abstract:

Research was conducted to examine the dipolar and exchange interactions between tyrosine Z and manganese in the S2Y(sub Z)* state of acetate-inhibited photosystem II using electron paramagnetic resonance (EPR) spectroscopy at X- and Q-bands. The positions and intensities of the hyperfine lines were accurately simulated and used to simulate the dipolar and exchange interactions. The relative intensities of components of the S2Y(sub Z)*EPR spectrum are best reproduced with a dipolar coupling.

Manganese, Manganese (Metal), Acetates, Tyrosine

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Probing local dynamics of the photosynthetic bacterial reaction center with a cysteine specific spin label

Article Abstract:

A multifrequency electron paramagnetic resonance (EPR) approach is used to probe the dynamic structure of the bacterial photosynthetic reaction (RC) center protein. Analysis of the multifrequency EPR spectra of the spin-labeled RC protein suggests the restricted character of the protein dynamics.

Proteins, Magnetic fields, Photosynthesis

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High-field EPR study of carotenoid and chlorophyll cation radicals in photosystem II

Article Abstract:

In photosystem II, chlorophyll, beta-carotene, and cytochrome are alternate electron donors that may be involved in a photoprotection mechanism. This study establishes the feasibility of using deuteration and high-field EPR to resolve the unresolvable cofactor signals in PS II.

Carotenoids, Radicals (Chemistry), Chlorophyll, Chemical properties, Atomic properties

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