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  • 1
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 21-peptide amide antibiotic gallidermin is a potential therapeutic against acne disease. It belongs to the class of polycyclic lanthionine and α,β-clidehydroamino acids containing polypeptides, which were named “lantibiotics.” The structural gene of the recently elucidated lantibiotic gallidermin encodes a precursor peptide containing Ser, Thr, and Cys residues in the Oterminal prolantibiotic part, and an unusually hydrophilic leader peptide. The ribosomally synthesized pregallidermin is posttranslationally modified and processed to a complex peptide antibiotic with four/sulfide rings and two unsaturated residues.The complete solution structure of gallidermin was determined in triffuoroethanol : water (95 : 5) and dimethylsulfoxide by two-dimensional 1H-nmr at 500 MHz, using a combination of double quantum filtered correlated spectroscopy, homonuclear Hartman-Hahn, and nuclear Overhauser enhancement spectroscopy experiments. Using a total number of 152 distance constraints from NOEs and 14 torsional constraints, derived from coupling constants, we obtained a screwlike solution structure of gallidermin. Restrained molecular dynamics simulations yielded a set of five converging structures with an atomic rms difference of 1.7 Å for the backbone atoms, not dependent on the starting structure. The spatial structure model is in excellent agreement with the amphiphilic and channel-forming properties of gallidermin on membranes and its tryptic cleavage at the exposed site between residues 13 and 14.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chicester [u.a.] : Wiley-Blackwell
    Journal of Molecular Recognition 8 (1995), S. 90-94 
    ISSN: 0952-3499
    Keywords: optimisation ; protein G chromatography ; monoclonal antibodies ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Compared to more stable chromatographic media the use of affinity media with biological ligands such as Protein G Sepharose® 4 Fast Flow poses special challenges regarding regeneration and sanitization. This is especially critical for the purification of pharmaceutical proteins, where complete regeneration of the column between runs is of paramount importance. Here, the problems encountered during process development and up scaling of regeneration methods for a protein G Sepharose Fast Flow column intended for the large-scale purification of pharmaceutical monoclonal anitbiodies are reported. The initially chosen alkaline regeneration buffer led to an increase in the affinity of Protein G towards antibodies which made elution increasingly difficult. A combination of urea and acetic acid was selected to ensure efficient cleaning of the matrix without affecting ligand properties.Validation experiments were done to demonstrate the functional integrity of the matrix after repeated cycles of use and regeneration, as well as the efficiency of the cleaning process.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 378-382 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: ω-Cycloheptyl-α-hydroxyundecansäure, eine neue Fettsäure aus einer thermo-acidophilen Bacillus-Speciesω-Cycloheptyl-α-hydroxyundecansäure wurde in präparativen Mengen aus einer neuen thermoacidophilen Bacillus-Species isoliert. Die neue, ungewöhnliche Fettsäure und ihr Methylester sowie ihr α-Ketosäure-methylester wurden eindeutig durch 1H- und 13C-Kernresonanz, Massen-und Infrarot-Spektren sowie durch Gaschromatographie bestimmt. Gaschromatographie an chiraler Phase ergab die D-Konfiguration für ω-Cycloheptyl-α-hydroxyundecansäure.
    Notes: ω-Cycloheptyl-α-hydroxyundecanoic acid was isolated in preparative amounts from a new thermoacidophilic Bacillus strain. The new unusual fatty acid, its methyl ester and α-keto acid methyl ester derivatives were unequivocally determined by 1H and 13C nuclear magnetic resonance, mass and infrared spectra, and gas chromatography. Gas chromatography on a chiral phase revealed the D-configuration for ω-cycloheptyl-α-hydroxyundecanoic acid.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 854-866 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Iturin AL: Structure and Derivatives of a Peptidolipid with a High Content of C16-Iturinic AcidsBacillus subtilis A 114 produces the peptidolipid iturin AL with high antifungal activity. Iturin AL is a difficultly separable mixture due to homologous β-amino fatty acid (iturinic acid) units, which differs from other iturins by its high content of C16-acids. The octapeptide ring of iturin AL has the following iturinic acid composition: 3-amino-12-methyltridecanoic acid (3%), 3-aminotetradecanoic acid (31%), 3-amino-13-methyltetradecanoic acid (15%), 3-amino-12-methyltetradecanoic acid (9%), 3-amino-14-methylpentadecanoic acid (35%), and 3-aminohexadecanoic acid (5%). The D-tyrosine ring of the antibiotic was acetylated, methylated, iodinated, nitrated, and aminated. Each derivative was chromatographed and characterized by spectroscopy.
    Notes: Bacillus subtilis A 114 produziert das Peptidolipid Iturin AL (1) mit hoher antifungischer Aktivität. Iturin AL ist ein schwierig zu trennendes Gemisch aufgrund homologer β-Aminofettsäure-(Iturinsäure-)Bausteine, wobei im Gegensatz zu anderen Iturinen ein ungewöhnlich hoher Anteil an C16-Säuren auftritt. Der Octapeptidring von Iturin AL hat folgende Iturinsäurenzusammensetzung: 3-Amino-12-methyltridecansäure (3%), 3-Aminotetradecansäure (31%), 3-Amino-13-methyltetradecansäure (15%), 3-Amino-12-methyltetradecansäure (9%), 3-Amino-14-methylpentadecansäure (35%) und 3-Aminohexadecansäure (5%). Der D-Tyrosinring des Antibiotikums wurde acetyliert, methyliert, iodiert, nitriert und aminiert. Jedes Derivat wurde chromatographiert und spektroskopisch charakterisiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 97 (1985), S. 1052-1054 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 24 (1985), S. 1051-1053 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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