The 33 kDa protein of photosystem II is a low-affinity calcium- and lanthanide-binding protein.

@article{Kruk2003The3K,
  title={The 33 kDa protein of photosystem II is a low-affinity calcium- and lanthanide-binding protein.},
  author={Jerzy Kruk and Květoslava Burda and Małgorzata Jemioła-Rzemińska and Kazimierz Strzałka},
  journal={Biochemistry},
  year={2003},
  volume={42 50},
  pages={14862-7}
}
We have shown that the isolated 33 kDa protein of photosystem II 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… CONTINUE READING