Untersuchungen über Komplexbildungen von Dehydrogenasen mit Coenzymanalogen
Investigations on complex formation of dehydrogenases with coenzyme analogues
- The coenzyme analogue nicotinamide 5-iodouracil-dinucleotide was synthesized by condensation of the two mononucleotides with dicyclohexylcarbodiimide in aqueous pyridine. The enzymatic properties of this compound were compared with those of the nicotinamide-uracil-dinucleotide. Both coenzyme analogues reacted slowly when functioning as a hydrogen carrier in enzymatic tests. The properties were similar to those of nicotinamide-benzimidazole-dinucleotide. The difference spectrum between the intact coenzyme analogue and its mononucleotides showed that the intramolecular interaction between the functional and non-functional moiety was smaller than that in NAD. The interaction corresponded to that of nicotinamide-benzimidazole-dinucleotide. The fluorescence excitation spectrum did not show any energy transfer from the non-functional iodouracil to the dihydronicotinamide part of the analogue. Difference spectra between the coenzyme - enzymecomplex and the two isolated components indicated that the unfolded dihydrocoenzyme was bound to the active site of lactate- and alcohol-dehydrogenase, respectively. Furthermore, they showed aromatic interaction of the non-functional part with parts of the protein. Introduction of iodine into the nicotinamide-uracil-dinucleotide did not remarkably alter the behavior of the analogues. As the iodine is bound very strongly to the coenzyme analogue, it may be useful for X-Ray-investigations of the dehydrogenases.
Verfasserangaben: | Christoph Wilhelm Wönckhaus, Dietmar Scherr |
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URN: | urn:nbn:de:hebis:30:3-714936 |
DOI: | https://doi.org/10.1515/znb-1971-0210 |
ISSN: | 1865-7117 |
ISSN: | 0932-0776 |
Titel des übergeordneten Werkes (Deutsch): | Zeitschrift für Naturforschung, B |
Verlag: | Verlag der Zeitschrift für Naturforschung |
Verlagsort: | Tübingen |
Dokumentart: | Wissenschaftlicher Artikel |
Sprache: | Deutsch |
Datum der Veröffentlichung (online): | 02.06.2014 |
Jahr der Erstveröffentlichung: | 1971 |
Veröffentlichende Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Datum der Freischaltung: | 29.12.2023 |
Jahrgang: | 26.1971 |
Ausgabe / Heft: | 2 |
Seitenzahl: | 7 |
Erste Seite: | 106 |
Letzte Seite: | 112 |
HeBIS-PPN: | 517669471 |
Institute: | Biochemie, Chemie und Pharmazie / Biochemie und Chemie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie | |
Sammlungen: | Universitätspublikationen |
Lizenz (Deutsch): | Creative Commons - Namensnennung-Nicht kommerziell-Keine Bearbeitung 3.0 |