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1990 (1)
1982 (1)
1Author    Hans Liidi, Bernhard Rauch, Wilhelm HasselbachRequires cookie*
 Title    The Influence of Detergents on the Ca2+-and Mg2+-Dependent Adenosine Triphosphatase of the Sarcoplasmic Reticulum  
 Abstract    During the stepwise solubilization of sarcoplasmic reticulum vesicles with detergents, the following changes in the structural and enzymatic properties of the preparation are observed: 1. The viscosity of the vesicular suspension initially rises. This change is accompanied by the formation of elongated tubules. Subsequently the membranes are completely desintegrated, resulting in a considerable reduction of the viscosity. 2. A decrease in the activity of the Ca2+-dependent ATPase, which is restored after complete solubilization. 3. A decrease in the change of intrinsic tryptophan-fluorescence on removal of calcium ions, which is also restored after complete solubilization. 4. A decrease of the calcium affinity of the ATPase. 5. A decrease in the amount of phosphorylated protein formed by the incorporation of inorganic phosphate. On the other hand, the amount of phosphoprotein formed from ATP is not affected during solubilization. 6. The dependence of the initial rates of phosphoprotein formation from inorganic phosphate on either magnesium or inorganic phosphate at low concentrations of the respective ligand changes from an S-shape profile to a normal hyperbolic profile after solubilization. 
  Reference    Z. Naturforsch. 37c, 299—307 (1982); received January 1982 
  Published    1982 
  Keywords    Sarcoplasmic Reticulum, ATPase, Detergent, Protein-Phosphorylation, Kinetics 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0299.pdf 
 Identifier    ZNC-1982-37c-0299 
 Volume    37 
2Author    J. Schmidt, H. Gottstein, Scheer, A. ScherzRequires cookie*
 Abstract    Micellar aggregates have been prepared from chloro­ phyll a. Whereas most detergents including non-ionic, zwitterionic and anionic ones, produce aggregates with long-wavelength shifted and enhanced Q Y absorption, the cationic detergents hexadecyl-trimethylammonium-bromide and hexadecyl-pyridiniumchloride produce complexes with opposite traits: The Q Y absorption is shifted to shorter wavelengths, and it is hypochromic. The optical activity is increased as in the long-wave­ length shifted complexes, but the cd bands are non-con­ servative and coincide with the absorption maxima. The complexes are most likely small aggregates o f chloro­ phyll with a changed geometry as compared to the "standard" ones. 
  Reference    Z. Naturforsch. 45c, 729—732 (1990); received January 26 1990 
  Published    1990 
  Keywords    Chlorophyll, Micelles, Detergent, Aggregation, Absorp­ tion, Circular Dichroism, Molecular Orbital 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0729_n.pdf 
 Identifier    ZNC-1990-45c-0729_n 
 Volume    45