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  • Title: Study of the interaction between NADP-dependent dehydrogenase and immobilized adenosine 2'-monophosphate by means of affinity electrophoresis.
    Author: Nakamura K, Kuwahara A, Takeo K.
    Journal: J Chromatogr; 1980 Aug 01; 196(1):85-99. PubMed ID: 7400292.
    Abstract:
    A water-soluble 8-substituted adenosine 2'-monophosphate-polyacrylamide (8-sub-2'-AMP-PA) was prepared as a new affinity ligand for the determination of the dissociation constants of the interactions between immobilized 8-sub-2'-AMP and NADP-dependent dehydrogenases (NADP-dependent DH), NAD-dependent dehydrogenases (NAD-dependent DH) and phosphorylase by means of affinity electrophoresis. From the dissociation constants, it was found that NADP-dependent DH had a much stronger affinity to immobilized 8-sub-2'-AMP than did NAD-dependent DH and phosphorylase. On the other hand, NADP-dependent DH had a much weaker affinity to immobilized 8-sub-5'-AMP than did NAD-dependent DH. The effects of NADP+ and NAD+ on the interaction between immobilized 8-sub-2'-AMP and NADP-dependent DH were also investigated by means of affinity electrophoresis. NADP+ inhibited the interaction specifically, but NAD+ did not inhibit the interaction. These results indicate that 8-sub-2'-AMP binds to the coenzyme binding site of NADP-dependent DH, while other compounds, such as 8-sub-5'-AMP and NAD+, do not bind to NADP-depenndent DH. Such a difference suggests that the phosphate group at position 2' in 2'-AMP and NADP+ is important for the binding at the coenzyme binding site of NADP-dependent DH.
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