plastosemiquinone

plastosemiquinone

English

Noun

plastosemiquinone (plural plastosemiquinones)

1. (biochemistry) Any semiquinone derived from a plastoquinone
   • 2014 July 15, Patrick J. O’Malley, Colin A. Wraight, Sergei A. Dikanov, “Hyperfine and Nuclear Quadrupole Tensors of Nitrogen Donors in the QA Site of Bacterial Reaction Centers: Correlation of the Histidine Nδ Tensors with Hydrogen Bond Strength”, in The Journal of Physical Chemistry. B‎, volume 118, DOI:10.1021/jp5051029:

     Also, DFT calculations on the plastosemiquinone anion radical in PSII found the histidine N δ to be the stronger of the two H-bond donors. 47 Therefore, the previous assignments of the hydrogen bond proton couplings for SQ A in PSII are not unambiguous. 46 From a comparative analysis of available nqi data for several semiquinone species and for copper complexes, 17 we find that the protonated imidazole nitrogens of these systems share similar valence orbital occupancies.