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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Parkesh, Raman Thomas, Justyn M. Ganesan, A. Vasudevan, Sridhar R. Churchill, Grant C. Rosen, Daniel Izumi, Minoru Mizote, Akiko Lewis, Alexander M. Aley, Parvinder K. Galione, Antony |
| Description | Author Affiliation: Rosen D ( Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, United Kingdom.) |
| Abstract | Nicotinic acid adenine dinucleotide phosphate (NAADP) is a Ca(2+)-releasing messenger. Biological data suggest that its receptor has two binding sites: one high-affinity locking site and one low-affinity opening site. To directly address the presence and function of these putative binding sites, we synthesized and tested analogues of the NAADP antagonist Ned-19. Ned-19 itself inhibits both NAADP-mediated Ca(2+) release and NAADP binding. A fluorometry bioassay was used to assess NAADP-mediated Ca(2+) release, whereas a radioreceptor assay was used to assess binding to the NAADP receptor (only at the high-affinity site). In Ned-20, the fluorine is para rather than ortho as in Ned-19. Ned-20 does not inhibit NAADP-mediated Ca(2+) release but inhibits NAADP binding. Conversely, Ned-19.4 (a methyl ester of Ned-19) inhibits NAADP-mediated Ca(2+) release but cannot inhibit NAADP binding. Furthermore, Ned-20 prevents the self-desensitization response characteristic of NAADP in sea urchin eggs, confirming that this response is mediated by a high-affinity allosteric site to which NAADP binds in the radioreceptor assay. Collectively, these data provide the first direct evidence for two binding sites (one high- and one low-affinity) on the NAADP receptor. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 50 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-12-11 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Carbolines Metabolism NADP Analogs & Derivatives Piperazines Receptors, Cell Surface Animals Binding Sites Biological Assay Calcium Chemistry Molecular Structure Antagonists & Inhibitors Oocytes Cytology Radioligand Assay Genetics Sea Urchins Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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