Comparison of the manganese oxygen-evolving complex in photosystem II of spinach and Synechococcus sp. with multinuclear manganese model compounds by X-ray absorption spectroscopy

Journal Article · Wed Jun 15 00:00:00 EDT 1994 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00091a031· OSTI ID:7248220

DeRose, V J; Mukerji, I; Latimer, M J ^[1]; Yachandra, V K; Klein, M P ^[2]; Sauer, K ^[3]

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1. Univ. of California, Berkeley, CA (United States)
2. Lawrence Berkeley Lab., CA (United States)
3. Univ. of California, Berkeley, CA (United States) Lawrence Berkeley Lab., CA (United States)

The evaluation of Mn X-ray absorption fine structure (EXAFS) studies on the oxygen-evolving complex (OEC) from photosystem II is described for preparations from both spinach and the cyanobacterium Synechococcus sp. poised in the S[sub 1] and S[sub 2] states. In addition to reproducing previous results suggesting the presence of bis([mu]-oxo)-bridged Mn centers in the OEC, a Fourier transform peak due to scatterers at an average distance of > 3 [angstrom] is detected in both types of preparation. In addition, subtle but reproducible changes are found in the relative amplitudes of the Fourier transform peaks due to mainly O ([approximately]1.8 [angstrom]) and Mn ([approximately] 2.7 [angstrom]) neighbors upon cryogenic advance from the S[sub 1] to the S[sub 2] state. Analysis of the peak due to scatterers at [approximately] 3 [angstrom] favors assignment to (per 4 Mn in the OEC) 1-2 heavy atom (Mn, Ca) scatterers at an average distance of 3.3-3.4 [angstrom]. The EXAFS data of several multinuclear Mn model compounds containing such scattering interactions are analyzed and compared with the data for the OEC. Structural models for the OEC are evaluated on the basis of these results. 40 refs., 9 figs., 5 tabs.

• OSTI ID: 7248220
• Journal Information: Journal of the American Chemical Society; (United States), Vol. 116:12; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
MANGANESE COMPLEXES
ABSORPTION SPECTROSCOPY
ELECTRON SPIN RESONANCE
PHOTOCHEMISTRY
X-RAY SPECTROSCOPY
COMPILED DATA
CYANOBACTERIA
OXYGEN
PHOTOSYNTHESIS
SPINACH
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
ELEMENTS
FOOD
INFORMATION
MAGNETIC RESONANCE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MICROORGANISMS
NONMETALS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PLANTS
RESONANCE
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VEGETABLES
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400102 - Chemical & Spectral Procedures
400500 - Photochemistry
550200 - Biochemistry