A KINETIC STUDY OF THE DEAMINATION OF SOME ADENOSINE ANALOGUES: SUBSTRATE SPECIFICITY OF ADENOSINE DEAMINASE
- 1 March 1966
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Biochemistry
- Vol. 44 (3), 331-337
- https://doi.org/10.1139/o66-039
Abstract
The kinetic constants Kmand Vmaxwere determined for the deamination by adenosine deaminase of a series of analogues of adenosine containing "fraudulent" sugars. The configuration of the 2′-hydroxyl was found to be important for the binding of enzyme and substrate. The largest effect of changes in sugar structure was on the rate of breakdown of the enzyme–substrate complex to form products, i.e. Vmax. The nature of the configuration in the 3′-position was not important if the 2′-hydroxyl was trans to the glycosidic linkage; however, if the steric arrangement of the 2′-hydroxyl was cis to the glycosidic linkage, then Vmaxshowed a marked dependence on the nature of the 3′-substituent and its configuration. For instance, Vmaxvalues were for arabinosyl adenine < 3′-deoxyarabinosyl adenine <lyxosyl adenine. 6-N-methyladenosine was found to be a competitive inhibitor of adenosine deaminase, with a Kiof 2 × 10−6M.Keywords
This publication has 14 references indexed in Scilit:
- DEAMINATION OF ADENINE AND RELATED COMPOUNDS AND FORMATION OF DEOXYADENOSINE AND DEOXYINOSINE BY LINGCOD MUSCLE ENZYMESCanadian Journal of Biochemistry, 1964
- Enzyme Inhibitors IJournal of Pharmaceutical Sciences, 1964
- Deoxyribosyl-8-azaadenine. Its deamination to deoxyribosyl-8-azahypoxanthine and effect on nucleic acid synthesis in Ehrlich ascites cells in vitroBiochimica et Biophysica Acta (BBA) - Specialized Section on Nucleic Acids and Related Subjects, 1964
- Inhibition of ribosephosphate pyrophosphokinase activity by decoyinine, an adenine nucleosideBiochemical and Biophysical Research Communications, 1964
- A purification of adenosine deaminase from the superficial mucosa of calf intestineBiochimica et Biophysica Acta, 1962
- The Properties of Adenosine Deaminase and Adenosine Nucleoside Phosphorylase in Extracts of Escherichia coliJournal of Biological Chemistry, 1959
- The determination of enzyme inhibitor constantsBiochemical Journal, 1953
- THE ENZYMATIC SYNTHESIS OF PURINE RIBOSIDESJournal of Biological Chemistry, 1947
- The Determination of Enzyme Dissociation ConstantsJournal of the American Chemical Society, 1934