Aug 1, 1976

8-Azidoacenine analogs of NAD+ and FAD. Synthesis and coenzyme properties with NAD+-dependent and FAD-dependent enzymes

European Journal of Biochemistry
R Koberstein

Abstract

The synthesis and purification of the 8-azidoadenine analogs of NAD+ (azido-NAD+) and FAD (AZIDO-FAD) from 8-azidoadenosine 5'-phosphate and NMN+ or FMN, respectively, is described. The coenzyme analogs are characterized by absorption, nuclear magnetic resonance and circular dichroism spectra. The two latter methods indicate a folded structure of azido-NAD+ and azido-FAD. Upon irradiation at 300 mn in aqueous solution, a change of the ultraviolet absorption spectra of the coenzyme analogs indicates photolysis of the azido group. The coenzyme properties of azido-NAD+ are demonstrated with lactate, glutamate and alcohol dehydrogenase yielding 14, 154 and 60%, respectively, of the V observed with NAD+. Concomitantly, the Km values of the coenzyme analogs are 1.7, 3.5 and 3-fold higher than those of NAD+. Azido-FAD is shown to be coenzyme of apo-glucose oxidase. The recovery of activity, however, is much slower in the presence of azido-FAD than with FAD. A final value of 66% of the activity with FAD is obtained. With apo-D-amino acid oxidase, azido-FAD is completely inactive, although it is specifically bound to the enzyme.

Mentioned in this Paper

In Vivo NMR Spectroscopy
D-Amino Acid Dehydrogenase
Lactate
Alcohol Oxidoreductases
Magnetic Resonance Imaging
Enzymes, antithrombotic
DAO gene
Photodegradation
Analog
Phosphate Measurement

About this Paper

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