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1994 (1)
1981 (1)
1Author    Eckhard Kumpe, H. Ans-G, Erhard Löffler, Friedhelm SchneiderRequires cookie*
 Title    Studies on the Zn2+/C o2+ Exchange with Acylamino Acid Amidohydrolase from Pig Kidney Co2+-Acylamino Acid Amido Hydrolase  
 Abstract    The kinetics of inactivation o f the Zn2+-metalloenzyme acyl-amino acid amido hydrolase by chelating ligands were studied. The rate of inactivation by 1,10-phenanthroline is enhanced by histidine and inhibited in the presence of phenyl-alanine. Removal of the metal ion increases the heat stability and decreases the pH stability of the enzyme. Reactivation o f the inactive metal free enzyme is possible with Zn2+ and Co2+. Titration of the metal free protein with a Co2+/nitrilotriacetate metal buffer revealed a dissociation constant of about 10~7 M for the Co2+ enzyme (Zn2+ enzyme = 10-10m). The Co2+ substituted enzyme is less stable than the Zn2+ < enzyme. Histidine and phenylalanine protect the Co2+ enzyme against inactivation by 1,10-phenanthroline. 
  Reference    Z. Naturforsch. 36c, 951—955 (1981); received June 261981 
  Published    1981 
  Keywords    Chelating Ligands, Co2+ Dissociation Constant, Apo-Enzyme 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0951.pdf 
 Identifier    ZNC-1981-36c-0951 
 Volume    36 
2Author    G. Stalke, M. Eorge, SheldrickRequires cookie*
 Title    Neue Cyclophosphazene mit Metallen der III. Hauptgruppe als Ringbausteine  
 Abstract    Acylic silylated phosphazenes of the type HN(PR2NSiMe3)2 (1) react quantitatively with molecules MMe3 (M = Al, Ga, In) under ring formation and CH4 evolution. The ring com­ pounds N(PPh2NSiMe3)2AlMe2 (2 a) and N(PPh2NSiMe3)2InMe2 (4 a) have been investiga­ ted by X-ray structure determination. 2a and 4a crystallize in the space groups P 1 and P 3 15 respectively; they show different conformations regarding the cyclohexane framework. NMR spectroscopy of the nuclei in the chelating phosphazene ligand indicates decreasing Lewis acidity of the metal containing fragments in the series AlMe2 > GaMe2 > InMe2. 
  Reference    (Z. Naturforsch. 49b, 43—49 [1994]; eingegangen am 22. September 1993) 
  Published    1994 
  Keywords    Cyclophosphazenes, Chelating Ligands, Conformational Isomers, Lewis Acidity, 27Al NMR Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0043.pdf 
 Identifier    ZNB-1994-49b-0043 
 Volume    49