The quinone acceptor A1 in Photosystem I: binding site, and comparison to Q(sub A) in purple bacteria reaction centers

Article Abstract:

Research was conducted to examine the nature of the binding site of the quinone acceptor A1 in Photosystem I (PSI) by modeling the protein and cofactor based on the structural data obtained from the intermediate resolution 4 angstrom X-ray diffraction electron density map the histidine ligation of P700 and the position and orientation of A1. Models were constructed within the degrees of freedom allowed by experimental limitations. Results are compared for consistency with published magnetic resonance data.

Bacteria, Binding sites (Biochemistry), Active sites (Biochemistry), Quinone, Quinones, Electron paramagnetic resonance spectroscopy

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A structural model for the charge separated state P(super .+)(sub 700)A(super .-)(sub 1) in photosystem I from the orientation of the magnetic Interaction Tensors

Article Abstract:

The charge separated state P(super .+)(sub 700)A(super.-)(sub 1) (P(sub 700)= primary electron donor, A(sub 1)=phylloquinone electron acceptor) in photosystem I of oxygenic photosynthesis by EPR spectroscopy in frozen solution and single crystals is investigated. The implications of the complete structural model from the A(super .-)(sub 1) and P(super .+)(sub 700) molecular tensors in the active charge separated state P(super .+)(sub 700)A(super .-)(sub 1) is studied.

Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Phosphorus & Compounds, Elemental Phosphorus, Phosphorus, Photochemistry

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The radical pair state P*+(sub 700)A*-(sub 1) in Photosystem I single crystals: orientation dependence of the transient spin-polarized EPR spectra

Article Abstract:

Research was conducted to examine the light-induced, charge-separated state P*+(sub 700)A*-(sub 1) in single crystals of Photosystem I (PSI) from the cyanobacterium Synechococcus elongatus using transient, direct-detection EPR spectroscopy. Together with independent knowledge about the location of A1 within the PSI reaction center, a nearly complete structural model for the head group of the functional A1 cofactor is attained.

Crystals, Electron paramagnetic resonance

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