Strontium EXAFS reveals the proximity of calcium to the manganese cluster of oxygen-evolving photosystem II
Article Abstract:
Research was conducted to examine the hypothesis that strontium extended X-ray absorption fine structure (EXAFS) reveals the proximity of calcium to the manganese cluster of oxygen-evolving photosystem II. Nonessential, loosely bound Sr were removed from the protein environment. An inactive sample was prepared by treating the intact PS II with hydroxylamine to disrupt the Mn cluster and to generate nonfunctional enzyme. Results reveal the proximity of Ca (Sr) cofactor to the Mn cluster using EXAFS.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Ultrafast time-resolved transient structures of solids and liquids studied by means of X-ray diffraction and EXAFS
Article Abstract:
Time-resolved X-ray diffraction and absorption were used to directly observe picosecond and nanosecond transient structures. The evolution of transient molecular structure on the atomic length scale during the course of a chemical reaction was provided by these experiments. Picosecond and nanosecond laser pulses induced ultrafast relaxation dynamics of crystal lattice structures as observed by time-resolved picosecond and nanosecond X-ray diffraction.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Structural effects of calcium depletion on the manganese cluster of photosystem II: determination by X-ray absorption spectroscopy
Article Abstract:
Research was conducted to examine the structural effects of calcium depletion on the manganese cluster of photosystem II using X-ray absorption spectroscopy. Measurements of Ca-depleted samples in the three modified S states indicate that the Fourier peak due to scatterers is strongly diminished. Results indicate that Mn-Mn contributions making up the second Fourier peak at approximately 2.7 angstrom are largely undisturbed by Ca-depletion.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
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