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Institute
- Biochemie, Chemie und Pharmazie (678) (remove)
Bei saurer Hydrolyse wird aus den 5-Halogenuracildesoxyribosiden die DR ** etwa 3 -4-mal rascher abgespalten als aus TdR oder UdR. CdR wird unter den gleichen Bedingungen 16-fach schneller hydrolysiert. Im Gegensatz dazu ist die Ribose im Cytidin um ein Mehrfaches fester gebunden als im Uridin. Im TdR-Dimeren wird durch die Absättigung der 5.6-Doppelbindung die Stabilität der N-glykosidischen Bindung stark erniedrigt. Aus diesen Befunden ergibt sich ein Hinweis auf die Elektronendichte-Verteilung im Pyrimidinring und damit eine chemische Basis für das mutagene Verhalten verschiedener unnatürlicher Desoxyriboside.
Bei der UV-Bestrahlung von Uracil-[5.6-3H] bilden sich je nach eingestrahlter Energie dimeres Uracil und Uracil-Wasseranlagerungsprodukt [5.6-Dihydro-6-hydroxyuracil] als radioaktive Photoprodukte. Während bei der Synthese des Wasseranlagerungsproduktes ein beträchtlicher sekundärer Isotopeneffekt wirksam wird, verändert sich die Radioaktivität des dimeren Uracils gegenüber der des Ausgangsuracils kaum.
Wird das Wasseranlagerungsprodukt durch Erwärmen zu Uracil zurückgewandelt, so dehydratisiert das Molekül ebenfalls unter Mitwirkung eines Isotopeneffektes. Wird das Uracildimere zu Uracil rückgewandelt, so beobachtet man keinen Isotopeneffekt.
Bei der Bestrahlung von Uracil in Tritium-haltigem Wasser werden nur sehr geringe Radioaktivitäten in die Photoprodukte eingebaut. Der Isotopeneffekt beträgt ca. 8. — Durch Synthese der Photoprodukte aus spezifisch an C-5 oder C-6 Tritium-markiertem Uracil bzw. durch Bromierung von 5.6-Tritium-markiertem Uracil bzw. dessen Photoprodukten zu den 5-Brom-Derivaten erhält man Hinweise, daß der Geschwindigkeits-bestimmende Schritt der Wasseraddition an C-6 des Uracils verläuft. Die inversen sekundären Isotopeneffekte betragen für Tritium an C-6 etwa 0,65, für Tritium an C-5 dagegen nur 0,95.
The photodynamic inactivation of nucleic acids with pyronin, methylene blue, thiopyronin and furocoumarines has been studied. The template efficiency of DNA in RNA-Polymerase reaction was found to be decreased after the treatment of DNA with these compounds. However, the magnitude of their inhibiting capacity varied from one compound to the other. Psoralen and thiopyronin were found to be the most active inhibitors followed by xanthotoxin and methylene blue respectively. At a lower temperature the inhibiting capacity of thiopyronin was considerably decreased but that of psoralen remained nearly unaffected. We have also tried to show evidence for a complimentary code in t-RNA through a specific destruction of guanine with thiopyronin.
Es wird das Mikrowellenspektrum von Fluorwasserstoffassoziaten im X-und K-Band bei -70 °C und 0,01 Torr gemessen und analysiert. Dazu wird ein erstelltes Frequenzprogramm für den asymmetrischen Kreisel verwendet, sowie ein Extrapolationsprogramm, das eine in der Literatur angegebene druck-und temperaturabhängige Verteilung der Fluorwasserstoffassoziate auf für Mikrowellenspektroskopie geeignete Drücke und Temperaturen umzurechnen erlaubt. Es zeigt sich, daß planare hexamere und heptamere Fluorwasserstoffassoziate vorliegen mit F-F-F-Winkeln von etwa 104° und H-F-Bindungslängen von 0,9997 Å bzw. 0,9640 Å. Die Längen der Wasserstoff brücken sind 1,4998 Å bzw. 1,6105 Å. Ein Vergleich der Bindungslängen zeigt, daß bei Anlagerung von H-F an (HF)6 eine Kontraktion der Fluorwasserstoffbindung um 3,5% und eine Dilatation der Wasserstoffbrückenbindung um 1% stattfindet. Dieses Ergebnis steht im Einklang mit der oben erwähnten Assoziatverteilung, die eine Minderung der Kettenstabilität beim Übergang von hexamerer zu heptamerer Kette erwarten läßt.
In the course of systematic investigations on sila-substituted parasympatholytics the diphenyl(2-aminoethoxymethyl)silanols 3b and 4b (and its carbon analogue 4a) were synthesized and characterized by their physical and chemical properties. In the solid state 4a and 4b form strong O-H---N hydrogen bonds, which are intramolecular (4a) and intermolecular (4b), respectively. 4a and 4b were found to be weak antimuscarinic agents (4b >4a) and strong papaverine-like spasmolytics (4a ≈4b).
The absolute configurations of the diastereomeric 10-hydroxyaloins, which may be regarded as parent structures for other naturally occurring oxanthrone-C-glucosyls, have been established as 10R, 16 R (A) and 10 S, 16 R (B) by an X-ray structure analysis of the A-octaacetyl derivative (C 16 is the anomeric glucosyl carbon atom). The determination was confirmed by CD spectroscopic comparison with the structural analogues aloins A and B, which should prove useful for making future configurational assignments within this class of compounds. A conformational analysis by the use of a molecular modeling method based on force-field calculations reveals the presence of an extra- and an intra-form, the extra-form of which is energetically preferred.