Journal
BIOCHEMISTRY
Volume 42, Issue 50, Pages 14862-14867Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi0351413
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We have shown that the isolated 33 kDa protein of photosystem 11 contains one calcium and one lanthanide low-affinity binding site with binding constants (K-D) on the order of 10(-5) M. Binding of calcium or lanthanides to this site induces conformational changes in the protein that manifest in fluorescence emission spectra of the protein, circular dichroism spectra, and calorimetric thermograms where the phase transitions are shifted to lower temperatures. The role of calcium binding to the 33 kDa protein in the attainment of its native structure and the significance of this interaction for the oxygen evolution process are discussed.
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