351. CD38: A NAADP degrading enzyme
- Author
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Hans-Willi Mittrücker, Karin Weber, Andreas H. Guse, Sören Bruhn, and Frederike Schmid
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NAADP ,Biophysics ,Thymus Gland ,Biology ,Biochemistry ,Jurkat cells ,Jurkat Cells ,Mice ,chemistry.chemical_compound ,Structural Biology ,Jurkat T lymphocyte ,hemic and lymphatic diseases ,Genetics ,Animals ,Humans ,Gene silencing ,Gene Silencing ,Molecular Biology ,Calcium signaling ,Mice, Knockout ,chemistry.chemical_classification ,Adenosine Diphosphate Ribose ,Membrane Glycoproteins ,Nicotinic acid adenine dinucleotide phosphate ,Adenosine diphosphate ribose ,Calcium signalling ,hemic and immune systems ,Cell Biology ,ADP-ribosyl Cyclase 1 ,In vitro ,Enzyme ,chemistry ,Second messenger system ,Calcium ,NADP ,Spleen ,CD38 - Abstract
The role of the multifunctional enzyme CD38 in formation of the Ca2+-mobilizing second messenger nicotinic acid adenine dinucleotide phosphate (NAADP) was investigated. Gene silencing of CD38 did neither inhibit NAADP synthesis in intact Jurkat T cells nor in thymus or spleen obtained from CD38 knock out mice. In vitro, both NAADP formation by base-exchange and degradation to 2-phospho adenosine diphosphoribose were efficiently decreased. Thus in vivo CD38 appears to be a NAADP degrading rather than a NAADP forming enzyme, perhaps avoiding desensitizing NAADP levels in intact cells.
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