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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 4721-4724 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1831
    Keywords: Key words Differential display ; Gene expression ; Virus reactivation ; Epstein-Barr virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Stimulation of Epstein-Barr virus (EBV) genome-positive Burkitt lymphoma cells with the ganglioside IV3NeuAc-nLcOse4Cer leads to the induction of cell differentiation processes and activates the EBV lytic viral cycle. In cells of the Burkitt lymphoma line Raji differential expression of host cell genes was analysed in the early phase (150 min) post stimulation with the ganglioside to display the cell activities that precede the activation of the EBV lytic cycle using the differential display reverse transcription-polymerase chain reaction technique. Multiple fragment cDNAs derived from control cells and ganglioside-stimulated cells were amplified using random primers and displayed via polyacrylamide gel electrophoresis. The expression pattern of 8,400 bands was analysed. Eleven differentially expressed fragment cDNAs were reamplified and identified by nucleotide sequencing. Six of these could be identified as coding for proteins that may take part in virus reactivation and differentiation. The most striking finding was the induction of s-adenosylhomocysteine hydrolase (AHCY) expression. The cellular enzyme AHCY plays an important role in transmethylation reactions controlling the replication of several viruses. Thus, an involvement in EBV replication can be suggested.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 471-502 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Isochromanquinone Antibiotics of the Naphthocyclinone SeriesFive new naphthocyclinones are isolated from the mycelium of Streptomyces arenae. From these, 5a, 19a, and 20a contain the molecular skeleton of β-naphthocyclinone (2a), the chromophore part is changed at the 4a/10a-double bond by addition of OH/acetonyl or OH/Cl and by epoxidation, respectively. It will be decided between possible regio- and stereoisomers by spectroscopic and chemical methods. The halves of the molecule of γ-iso-naphthocyclinone (29a) are connected unsymmetrically, this is remarkable with regard to the biosynthesis. The corresponding stereo-chemistry of the naphthocyclinones is confirmed by chemical transformations. The photolysis of the epoxide 20a into α-naphthocyclinone (1a) is to be emphasized. Furthermore, it will be reported on the biological activity of the naphthocyclinones
    Notes: Aus dem Mycel von Streptomyces arenae werden fünf neue Naphthocyclinone isoliert. Von diesen enthalten 5a, 19a und 20a das Molekülgerüst des β-Naphthocyclinons (2a), der Chromophorteil ist durch Addition von OH/Acetonyl oder OH/Cl bzw. durch Epoxidierung an der 4a/10a-Doppelbindung verändert. Zwischen möglichen Regio- und Stereoisomeren wird mit spektroskopischen und chemischen Methoden entschieden. Im γ-iso-Naphthocyclinon (29a) sind, biogenetisch bemerkenswert, die Molekülhälften unsymmetrisch verknüpft. Durch die chemische Umwandlung der Naphthocyclinone ineinander gelingt es, ihre Stereochemie aufzuklären. Hervorzuheben ist die Photolyse des Epoxids 20a zum α-Naphthocyclinon (1a). Über die biologische Aktivität der Naphthocyclinone wird berichtet.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 13C-NMR- und CD-Spektroskopie mit Isochromanchinonen. - Zuverlässige Methoden zur Bestimmung der Stereochemie und des Tautomeriegleichgewichtes in dieser AntibiotikagruppeDie 13C-NMR- und CD-Spektren von Isochromanchinonen der Naphthocyclinon- und Actinorhodin-Reihe werden eingehend interpretiert. Die beiden spektroskopischen Methoden lassen sich so weit entwickeln, daß die schwierigen Strukturprobleme in dieser Antibiotikagruppe zukünftig einfach und zuverlässig gelöst werden können. Außerdem läßt sich bei diesen Naturstoffen erstmals das Gleichgewicht zwischen den Tautomeren 1-4 (R3 = H) des Naphthazarin-Chromophors für Lösungen genauer beschreiben.
    Notes: The isochromanquinones of the naphthocyclinone and actinorhodin series get a thorough interpretation of their 13C-NMR and CD spectra. By improving these two methods the difficult structural problems in the whole group of these antibiotics will be solved easily and reliably. In addition, the equilibrium of the naphthazarin tautomers 1-4 (R3 = H) in solution can be described more exactly for the first time.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 510-518 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Determination of the Connection of Dimeric Isochromanequinone by Diazomethane DegradationThe diazomethane degradation is a chemical method to determine the connection of the halves of the molecule in the actinorhodines and naphthocyclinones and to decide between the regioisomers of dimeric isochromanequinones. The prefered direction of the addition of diazomethane to the deacetylnaphthocyclinones results from the structure of the indazolequinones 7b, 10A, 13A, and 16A as well as the seco-naphthocyclinones 17a-c formed by thermal fragmentation of the diazomethane adducts. _ The different portion of the indazolequinones 16A and 16B resulting from γ-naphthocyclinone (14a) and γ-iso-naphthocyclinone (22a), respectively, refers to a mistake of dimerization made in biosynthesis
    Notes: Mit dem Diazomethan-Abbau steht eine chemische Methode zur Verfügung, um die Verknüpfung der Molekülhälften bei den Actinorhodinen und Naphthocyclinonen zu bestimmen und zwischen Regioisomeren der dimeren Isochromanchinone zu entscheiden. Die bevorzugte Additionsrichtung des Diazomethans an die Desacetylnaphthocyclinone folgt aus der Struktur der Indazolchinone 7b, 10A, 13A und 16A sowie der seco-Naphthocyclinone 17a-c, die bei der thermischen Fragmentierung der Diazomethan-Addukte entstehen. _ Der unterschiedliche Anteil der Indazolchinone 16A und 16B aus γ-Naphthocyclinon (14a) bzw. γ-iso-Naphthocyclinon (22a) deutet auf einen Dimerisierungsfehler bei der Biosynthese von 22a hin.
    Type of Medium: Electronic Resource
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