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1Author    M. KumakuraRequires cookie*
 Title    Association of an Antibody-Conjugated Enzyme with Synthetic Polymers Dissolved in Organic Solvents  
 Abstract    A n antibody of a tumor marker (a-fetoprotein) conju­ gated with peroxidase was dispersed in organic solvents including synthetic polymers, and the interaction o f the antibody with the polymers was investigated. It was found that the antibody-conjugated enzyme is associated with the polymers dissolved in hydrophobic organic sol­ vents. The association correlated with the polym eriza­ tion degree, concentration, and nature of the polymers. 
  Reference    Z. Naturforsch. 49c, 891—8 (1994); received January 10/August 15 1994 
  Published    1994 
  Keywords    Antibody, Enzyme, Association, Polymer, Solvent 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0891_n.pdf 
 Identifier    ZNC-1994-49c-0891_n 
 Volume    49 
2Author    Ingrid Pilz, K. Arin Goral, FriedrichV D HaarRequires cookie*
 Title    Phenylalanyl-tRNA Synthetase from Baker'Yeast: Structural Organization of the Enzyme and Its Complex with tRNAPhe as Determined by X-Ray Small-Angle Scattering  
 Abstract    The quaternary structure of the phenylalanyl-tRNA synthetase and its complex with tRNAPhe was studied in dilute solutions by small angle X-ray scattering. For the free synthetase the radius of gyration was determ ined as 5.5 nm, the volume 523 nm 3, the maximum diam eter 17.5 nm and the m olecular weight as 260 000 using an isopotential specific volume of 0.735. The overall shape could be best approxim ated by a flat cylinder with dimensions 18.2 n m X l l .5 n m X 4 nm ; the loose structure was approxim ated by building up the cylinder by spheres (diam eter 4.2 n m). The corresponding param eters of the enzyme tRN A complex were the following: radius of gyration 5.9 nm, volume 543 nm 3, maximum diam eter 21 nm and m olecular weight 290 000. These param eters suggest an 1:1 complex, whereby it m ust be assumed that the tRN A m olecule is attached in the extension of the longer axis. From the difference in the distance distribution functions of the free enzyme and the complex it is evident that we have to assume a change of conform ation (contraction) of the enzyme upon the binding of the specific tRNA. 
  Reference    Z. Naturforsch. 34c, 20 (1979); received November 20 1978 
  Published    1979 
  Keywords    X-Ray, Small-Angle, Scattering, Enzyme, Complex 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0020.pdf 
 Identifier    ZNC-1979-34c-0020 
 Volume    34 
3Author    Brigitte Schumann, Walter Maier, Detlef GrögerRequires cookie*
 Title    Characterization of Some Claviceps Strains Derived from Regenerated Protoplasts  
 Abstract    Three ergoline alkaloids producing Claviceps strains easily formed protoplasts when treated with snail digestive extract ex Helix pomatia. Colonies obtained after regeneration of protoplasts were monitored for alkaloid production. Among the regenerated progeny strains could be iso­ lated which differ considerably in the quantity of ergolines and the composition of the alkaloid mixture compared with parental strains. Protoplast-derived strains were stable in morphology and alkaloid production for more than four years if the propagation was performed with hyphal fragments. Activities of some alkaloid-specific enzymes e.g. oxygenases and ergotamine syntheta­ se were studied in various related strains. 
  Reference    Z. Naturforsch. 42c, 381 (1987); received November 6 1986 
  Published    1987 
  Keywords    Claviceps, Protoplasts Regeneration, Strain Development, Ergot Alkaloids, Enzymes 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0381.pdf 
 Identifier    ZNC-1987-42c-0381 
 Volume    42 
4Author    Gerhard Kasang, Leopold Von Proff, Michael NichollsRequires cookie*
 Title    Enzymatic Conversion and Degradation of Sex Pheromones in Antennae of the Male Silkworm Moth Antheraea polyphemus  
 Abstract    In living antennae of the male silkworm moth Antheraea polyphemus the pheromone com-pounds [6,7-3 H]-6,ll-hexadecadienyl acetate and [12,13-3 H]-10,12-hexadecadienol are enzymati-cally converted to their corresponding fatty alcohols, aldehydes, acids and long-chained fatty acid esters. In antennae of freshly hatched moths the 3 H-labeled pheromones are degraded at high rates to volatile polar metabolites. The half-life of the pheromone acetate is about 3 min. In dried antennae the pheromone acetate is merely hydrolyzed to the fatty alcohol. 
  Reference    Z. Naturforsch. 43c, 275—284 (1988); received December 14 1987/January 25 1988 Dedicated to 
  Published    1988 
  Keywords    birthday Moth, Antennae, Pheromones, Metabolites, Enzymes 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0275.pdf 
 Identifier    ZNC-1988-43c-0275 
 Volume    43 
5Author    Rene Csuk, BrigitteI. GlänzerRequires cookie*
 Title    Biocatalytical Transformations, III [1] Regioselective Enzymic Deacetylations of Laevoglucosane Triacetate  
 Abstract    Several hydrolytic enzymes (porcine liver esterase, lipase from wheat germ type I, and the lipase from rhizopus javanicus) efficiently deacetylate laevoglucosane triacetate (2) with good re-gioselectivity into diacetylated laevoglucosane derivatives (3—5). 
  Reference    Z. Naturforsch. 43b, 1355—1357 (1988); received June 3 1988 
  Published    1988 
  Keywords    1, 6-Anhydro Sugar, Laevoglucosane Triacetate, Deacetylation, Enzymes, Lyophilized Yeast 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1355.pdf 
 Identifier    ZNB-1988-43b-1355 
 Volume    43 
6Author    ErwinW. BeckerRequires cookie*
 Title    Dynamics and Kinetics of Enzymes Kinetic Equilibrium of Forces in Biochemistry  
 Abstract    To explain the high specificity, high reaction rate, and high thermodynamic efficiency in enzymatic processes, cooperation of the enzyme with a molecular transfer unit is assumed. A "kinetic equilibrium of forces" is suggested, which enables high reaction rates to occur under equilibrium conditions and a thorough examination of the substrate to be made without con­ sumption of free energy. In case o f ATPases, ion-binding proteins are the most probable trans­ fer units. By analyzing the elementary effect in muscle contraction it is shown that the new theorem may be of substantial value in elucidating biochemical processes. 
  Reference    Z. Naturforsch. 47c, 628—633 (1992); received May 18 1992 
  Published    1992 
  Keywords    Enzyme, Mechanism, Free Energy Transfer, ATPase, Calmodulin, Muscle Contraction 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0628.pdf 
 Identifier    ZNC-1992-47c-0628 
 Volume    47 
7Author    Yun-Fuk Tsang, RagaiK. IbrahimRequires cookie*
 Title    Evidence for the Existence of meta and para Directing O-Methyltransferases in Tobacco Cell Cultures  
 Abstract    The O-methyltransferase of tobacco cell culture was resolved to its meta and para directing forms by chromatography on DEAE-cellulose. Despite similarities in molecular weights and pi values of the two forms, however, evidence from pH optima, SH-group inhibitors, methylation ratios, SDS-acrylamide gels and mixed substrate experiments indicates the existence of two discrete enzymes acting at the meta and para positions of caffeic acid and quercetin, respectively; though the latter enzyme was less substrate specific than its meta counterpart. 
  Reference    Z. Naturforsch. 34c, 46 (1979); received November 17 1978 
  Published    1979 
  Keywords    O-Methyltransferase, Enzyme, meta and para Methylation, Phenols, Tobacco Cell Suspension Culture, Nicotiana tabcaum 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0046.pdf 
 Identifier    ZNC-1979-34c-0046 
 Volume    34