title: Important roles of tyrosines in photosystem II and cytochrome oxidase.
abstract: Theoretical studies (B3LYP) on models of the active sites in Photosystem II (PSII) and cytochrome oxidase are discussed. The role of a tyrosyl radical in the O-O bond formation in PSII is investigated, as well as the tyrosyl radical formation. In cytochrome oxidase, mechanisms for O-O bond cleavage involving tyrosyl radical formation are investigated, together with possible roles for the tyrosine in the proton translocation.
authors.affiliation: Department of Physics, Stockholm Centre for Physics, Astronomy and Biotechnology, Stockholm University, ALBANOVA, SE-106 91 Stockholm, Sweden.
authors.forename: Per E M
authors.initials: PE
authors.lastname: Siegbahn
authors.forename: Margareta R A
authors.initials: MR
authors.lastname: Blomberg
mesh_terms: D004579:Electron Transport; D003576:Electron Transport Complex IV / Q000737:chemistry* / Q000378:metabolism*; D005609:Free Radicals / Q000378:metabolism; D008958:Models, Molecular; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000378:metabolism*; D018892:Proton-Motive Force; D014443:Tyrosine / Q000737:chemistry*
chemical_list: D005609:Free Radicals; D045332:Photosystem II Protein Complex; D014443:Tyrosine; D003576:Electron Transport Complex IV