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1Author    Hiroyuki Koike, Yasuhiro Kashino, Kazuhiko SatohRequires cookie*
 Title    Interactions of Halogenated Benzoquinones with the Non-Heme Iron (Q40o) in Photosystem II  
 Abstract    Interactions o f halogenated benzoquinones with the acceptor side o f Photosystem (PS) II were studied by measuring fluorescence induction curves and flash-induced absorbance changes in PS II particles isolated from Synechococcus vulcanus. Following results were ob­ tained: 1) Addition o f some halogenated benzoquinones prior to 3-(3,4-dichlorophenyl)-l,l-dimethylurea (D C M U) in the dark increased the area above the fluorescence induction curve (work integral) by a factor o f two. 2) Based on the ability to increase the fluorescence work integral, halogenated benzoquinones could be divided into two groups. 3) 2,6-D ichlorobenzo-quinone (2,6-D C BQ), trichlorobenzoquinone (TCBQ) and tetrahalogenated benzoquinones except tetrafluorobenzoquinone (fluoranil) (group A) increased the work integral, but 2,5-D CBQ and fluoranil (group B) did not. 4) Rapid reoxidation o f QA was observed in the presence o f quinones which belong to group A. These results were interpreted in terms o f dark oxidation o f by quinones belonging to group A. Possible mechanisms o f oxidation o f Q400 by these quinones in the dark are discussed. 
  Reference    Z. Naturforsch. 48c, 168 (1993); received Novem ber 9 1992 
  Published    1993 
  Keywords    Photosystem II, Q400, Halogenated Benzoquinone, Q B-Site, Fluorescence Induction 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0168.pdf 
 Identifier    ZNC-1993-48c-0168 
 Volume    48