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  • General Chemistry  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 179-186 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nucleosidphosphorothioate sind modifizierte Nucleotide, bei denen ein an ein Phosphoratom gebundenes Sauerstoffatom gegen ein Schwefelatom ausgetauscht ist. Zur Untersuchung der Wirkungsweise von Enzymen sind diese Verbindungen deshalb geeignet, weil sie zwar von Enzymen in vielen Fällen ähnlich gut wie das natürliche Substrat gebunden werden, die enzymatischen Reaktionen aber oft wesentlich langsamer ablaufen. Da Nucleosidthiophosphorsäure-O-ester als Diastereomere auftreten, kann mit diesen Verbindungen in geeigneten Fällen die Stereochemie enzymatischer Reaktionen überprüft werden.
    Additional Material: 1 Ill.
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  • 2
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 95 (1983), S. 431-447 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nucleosidphosphorothioate sind vielseitig verwendbare Analoga von Nucleotiden. So sind sie einerseits in vielen, aber nicht in allen Fällen gegen Hydrolyse stabiler als die nicht-modifizierten Nucleotide, eine Eigenschaft, die sie mit anderen Nucleotidanaloga gemeinsam haben. Andererseits sind sie für viele, aber nicht für alle Reaktionen, bei denen das Nucleotid oder die Phosphorothioatgruppe auf andere Acceptormoleküle als H2O übertragen wird, gute Substrate. Dies führt dazu, daß sie nicht so rasch wieder enzymatisch entfernt werden können, wenn sie einmal in ein System wie DNA inkorporiert sind. Was sie gewissermaßen einzigartig macht, ist die Chiralität am Phosphor, wenn zwei ungleiche Reste mit der Phosphorothioatgruppe verbunden sind. Dies ermöglicht ihre Verwendung zur Untersuchung stereochemischer Aspekte enzymatischer Reaktionen. Zu diesen Eigenschaften kommen solche hinzu, die man von einem Austausch eines Sauerstoffatoms in einer Phosphatgruppe gegen ein Schwefelatom erwartet, wie z. B. die erhöhte Affinität zu Quecksilberverbindungen und die starke Verschiebung der Signale im 31P-NMR-Spektrum. Bedenkt man, in wie vielen biologisch interessanten Verbindungen Phosphatgruppen enthalten sind, verwundert das starke Interesse an diesen Nucleotidanaloga nicht.
    Additional Material: 27 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 29 (1990), S. 820-820 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 160-166 
    ISSN: 0570-0833
    Keywords: Enzyme mechanisms ; Phosphorothioates ; Nucleotides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nucleoside phosphorothioates are modified nucleotides in which an oxygen atom bound to a phosphorus atom has been replaced by a sulfur atom. These compounds are suitable for the investigation of enzyme mechanisms because, although they are bound by enzymes in many cases just as well as the natural substrate, the enzymatic reactions very often proceed considerably more slowly. Since nucleoside thiophosphate O-esters exist as diastereomers these compounds can be used in suitable cases for information about the stereochemistry of enzymatic reactions.
    Additional Material: 1 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 22 (1983), S. 423-439 
    ISSN: 0570-0833
    Keywords: Phosphorothioates ; Nucleotides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nucleoside phosphorothioates are analogues of nucleotides with a wide range of applications. Thus, on the one hand, in many but not all cases they are more stable against hydrolysis than the unmodified nucleotides - a property which they share with other nucleotide analogues. On the other hand, however, they are good substrates for many, but not all reactions where the nucleotide or the phosphorothioate group is transferred to an acceptor other than H2O. As a consequence, once incorporated into a system such as DNA, phosphorothioates cannot be easily removed.What makes these compounds unique to a certain extent is the chirality at the phosphorus center if two nonequivalent residues are linked to the phosphorothioate group. This opens the way for the use of these compounds to investigate stereochemical aspects of enzymatic reactions. In addition to these properties, there are those expected from exchange of an oxygen for a sulfur atom in a phosphate group, e.g. the increased affinity towards mercury derivatives and the large chemical shift of the 31P-NMR sinals.If one considers how many biologically interesting compounds contain phosphate groups, the considerable interest in these nucleotide analogues is not surprising.
    Additional Material: 27 Ill.
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