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1990 (1)
1982 (1)
1Author    Bernhard HuchzermeyerRequires cookie*
 Title    Energy Transfer Inhibition Induced by Nitrofen  
 Abstract    The herbicide nitrofen was shown to act as an energy transfer inhibitor. The results proved nitrofen to act by inhibiting nucleotide exchange on the chloroplast coupling factor. A strong correlation was found between the inhibition o f phosphorylation, ATPase activity, and nucleotide exchange. These results are discussed in terms of a regulatory effect o f tightly bound A D P on the enzymatic activity o f the chloroplast coupling factor. 
  Reference    Z. Naturforsch. 37c, 787—792 (1982); received April 30/June 8 1982 
  Published    1982 
  Keywords    Herbicides, Nitrofen, Energy Transfer Inhibition, Photophosphorylation, N ucleotide Exchange 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0787.pdf 
 Identifier    ZNC-1982-37c-0787 
 Volume    37 
2Author    Bernhard Huchzermeyer, Andreas LöhrRequires cookie*
 Title    Diphenyl Ether Herbicides, a Tool to Elucidate the Mechanism of Photophosphorylation  
 Abstract    At least two different classes of A DP binding sites on chloroplast coupling factor are de­ scribed in the literature. High-affinity sites are assumed to entail regulatory functions while low-affinity sites are involved in catalysis. Diphenyl ether herbicides, acting as energy transfer inhibitors, interfere with nucleotide ex­ change on both categories of A D P binding sites. Their inhibitory potency varies depending on their substitution. We found that each diphenyl ether assayed revealed identical / 50 values for inhibition of nucleotide interaction with both classes of binding sites. We show here that diphenyl ether inhibition of energytransfer is primary based upon the interference with A DP binding to high-affinity binding sites. Thereby the control of proton permeability through the coupling factor complex is affected. Moreover, we found that the three ß-subunits are not absolutely fixed in one conformational state: After covalently block­ ing the high-affinity site by an azido-label, a new ß-subunit. 
  Reference    Z. Naturforsch. 45c, 552—557 (1990); received October 10 1989 
  Published    1990 
  Keywords    Diphenyl Ethers, Energy-Transfer Inhibition, Nitrofen, Photophosphorylation, Coupling Factor 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0552.pdf 
 Identifier    ZNC-1990-45c-0552 
 Volume    45