Nicotinic Acid Adenine Dinucleotide Phosphate Analogues Containing Substituted Nicotinic Acid: Effect of Modification on Ca<sup>2+</sup> Release
作者:Pooja Jain、James T. Slama、LeRoy A. Perez-Haddock、Timothy F. Walseth
DOI:10.1021/jm1007209
日期:2010.11.11
in potency for competition ligand binding assays using [32P]NAADP. In contrast, several 5-substituted NAADP derivatives showed high potency for binding and full agonist activity for Ca2+ release. 5-Azido-NAADP was shown to release calcium from sea urchin egg homogenates at low concentration and to compete with [32P]NAADP in a competition ligand binding assay with an IC50 of 18 nM, indicating that this
在烟酸部分的 4 位或 5 位位置被取代的烟酸腺嘌呤二核苷酸磷酸 (NAADP) 的类似物已使用Aplysia californica ADP-核糖基环化酶或哺乳动物 NAD 糖水解酶从 NADP 酶促合成。烟酸的 4 位取代导致从海胆卵匀浆中释放 Ca 2+ 离子的激动剂效力丧失,并导致使用 [ 32 P]NAADP进行竞争配体结合测定的效力丧失。相比之下,几种 5-取代 NAADP 衍生物显示出对 Ca 2+ 的高结合力和完全激动剂活性释放。5-叠氮基-NAADP 以低浓度从海胆卵匀浆中释放钙,并在竞争配体结合试验中与[ 32 P]NAADP 竞争,IC 50为 18 nM,表明该化合物可能是一种潜在的光探针可用于 NAADP 受体的特异性标记和鉴定。