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Crystal Structure of PsbQ from Synechocystis sp. PCC 6803 at 1.8 Å: Implications for Binding and Function in Cyanobacterial Photosystem II

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journal contribution
posted on 06.04.2010 by Simon A. Jackson, Robert D. Fagerlund, Sigurd M. Wilbanks, Julian J. Eaton-Rye
In Synechocystis sp. PCC 6803, PsbQ is associated with photosystem II (PSII) complexes with the highest activity and stability. However, this subunit is not found in PSII X-ray crystallographic structures from Thermosynechococcus elongatus or Thermosynechococcus vulcanus. We present the crystal structure of cyanobacterial PsbQ determined in the presence and absence of Zn2+. The protein has a well-defined helical core, containing four helices arranged in an up−down−up−down fold. A conserved potential interaction site composed of a divalent metal binding site and adjacent hydrophobic pocket has been identified.