| The base exchange reaction of NAD+ glycohydrolase: identification of novel heterocyclic alternative substrates. | |
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MedLine Citation:
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PMID: 18835239 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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ADP-ribosyl cyclase and NAD+ glycohydrolase (CD38, E.C.3.2.2.5) efficiently catalyze the exchange of the nicotinamidyl moiety of NAD+, nicotinamide adenine dinucleotide phosphate (NADP+) or nicotinamide mononucleotide (NMN+) with an alternative base. 4'-Pyridinyl drugs (amrinone, milrinone, dismerinone and pinacidil) were efficient alternative substrates (k(cat)/K(M)=0.9-10 microM(-1)s(-1)) in the exchange reaction with ADP-ribosyl cyclase. When CD38 was used as a catalyst the k(cat)/K(M) values for the exchange reaction were reduced two or more orders of magnitude (0.015-0.15 microM(-1)s(-1)). The products of this reaction were novel dinucleotides. The values of the equilibrium constants for dinucleotide formation were determined for several drugs. These enzymes also efficiently catalyze the formation of novel mononucleotides in an exchange reaction with NMN+, k(cat)/K(M)=0.05-0.4 microM(-1)s(-1). The k(cat)/K(M) values for the exchange reaction with NMN+ were generally similar (0.04-0.12 microM(-1)s(-1)) with CD38 and ADP-ribosyl cyclase as catalysts. Several novel heterocyclic alternative substrates were identified as 2-isoquinolines, 1,6-naphthyridines and tricyclic bases. The k(cat)/K(M) values for the exchange reaction with these substrates varied over five orders of magnitude and approached the limit of diffusion with 1,6-naphthyridines. The exchange reaction could be used to synthesize novel mononucleotides or to identify novel reversible inhibitors of CD38. |
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Authors:
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Frank Preugschat; Ginger H Tomberlin; David J T Porter |
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Publication Detail:
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Type: Journal Article Date: 2008-09-22 |
Journal Detail:
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Title: Archives of biochemistry and biophysics Volume: 479 ISSN: 1096-0384 ISO Abbreviation: Arch. Biochem. Biophys. Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-10-30 Completed Date: 2008-11-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372430 Medline TA: Arch Biochem Biophys Country: United States |
Other Details:
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Languages: eng Pagination: 114-20 Citation Subset: IM |
Affiliation:
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Department of Biochemistry and Pharmacology, GlaxoSmithKline, 5 Moore Drive, 3.2114, Research Triangle Park, NC 27709, USA. fp41724@gsk.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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ADP-ribosyl Cyclase
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chemistry*,
metabolism Animals Aplysia / enzymology* Catalysis Enzyme Inhibitors / chemistry NAD+ Nucleosidase / chemistry*, metabolism Ribonucleotides / chemistry*, metabolism Substrate Specificity / physiology |
| Chemical | |
Reg. No./Substance:
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0/Enzyme Inhibitors; 0/Ribonucleotides; EC 3.2.2.5/ADP-ribosyl Cyclase; EC 3.2.2.5/NAD+ Nucleosidase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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