title: Oxygen-evolving complex of Photosystem II: an analysis of second-shell residues and hydrogen-bonding networks.
abstract: The oxygen-evolving complex (OEC) is a Mn4O5Ca cluster embedded in the Photosystem II (PSII) protein complex. As the site of water oxidation, the OEC is connected to the lumen by channels that conduct water, oxygen, and/or protons during the catalytic cycle. The hydrogen-bond networks found in these channels also serve to stabilize the oxidized intermediates, known as the S states. We review recent developments in characterizing these networks via protein mutations, molecular inhibitors, and computational modeling. On the basis of these results, we highlight regions of the PSII protein in which changes have indirect effects on the S1, S2, and S3 oxidation states of the OEC while still allowing photosynthetic activity.
authors.affiliation: Department of Chemistry, Yale University, New Haven, CT 06520-8107, United States.
authors.forename: Leslie
authors.initials: L
authors.lastname: Vogt
authors.affiliation: Department of Chemistry, Yale University, New Haven, CT 06520-8107, United States.
authors.forename: David J
authors.initials: DJ
authors.lastname: Vinyard
authors.affiliation: Department of Chemistry, Yale University, New Haven, CT 06520-8107, United States.
authors.forename: Sahr
authors.initials: S
authors.lastname: Khan
authors.affiliation: Department of Chemistry, Yale University, New Haven, CT 06520-8107, United States. Electronic address: gary.brudvig@yale.edu.
authors.forename: Gary W
authors.initials: GW
authors.lastname: Brudvig
mesh_terms: D004579:Electron Transport; D006860:Hydrogen Bonding; D010100:Oxygen / Q000378:metabolism*; D010788:Photosynthesis; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000378:metabolism*; D014867:Water / Q000378:metabolism
chemical_list: D045332:Photosystem II Protein Complex; D014867:Water; D010100:Oxygen