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1993 (1)
1Author    Walter Oettmeier, Klaus Masson, Ralf Kloos, Ellen ReilRequires cookie*
 Title    On the Orientation of Photosystem II Inhibitors in the QB-Binding Niche: Acridones, Xanthones and Quinones  
 Abstract    The orientation o f acridones, xanthones, 1,4-benzo-and naphthoquinones within the ph o­ tosystem II Q b herbicide-binding niche was studied by means o f mild trypsination and by esti­ mation o f p /50-values in Chlamydomonas reinhardtii D 1 mutants (Val219 > lie, A la25, > Val, Phe255 > Tyr, Ser264 > Ala, A sn266 > Thr, and Leu275 > Phe). A s judged from the R/S-values (ratios o f -^50 -values resistant versus susceptible type) close to 1 in all mutants, the acridones and xanthones do not have strong interactions with the parent amino acids. Contrary, the qui-nones exhibit extreme low R/S-values down to 0.003 (for 2,5-dibrom o-3-m ethyl-6-isopropyl-1,4-benzoquinone; D BM IB) in the Ser264 mutant. This extreme negative cross resistance or supersensitivity indicates that the quinones do not droxyl group. 
  Reference    Z. Naturforsch. 48c, 146—151 (1993); received December 3 1992 
  Published    1993 
  Keywords    Chlamydomonas reinhardtii Mutants, D 1 Protein, Antibody, Trypsination 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0146.pdf 
 Identifier    ZNC-1993-48c-0146 
 Volume    48