Structural Determinants for N1/N7 Cyclization of Nicotinamide Hypoxanthine 5‘-Dinucleotide (NHD+) Derivatives by ADP-Ribosyl Cyclase from Aplysia californica: Ca2+-Mobilizing Activity of 8-Substituted Cyclic Inosine 5‘-Diphosphoribose Analogues in T-Lymphocytes
摘要:
A series of nicotinamide hypoxanthine 5'-dinucleotide (NHD+) analogues modified at C-8 (2-5) and 7-deaza-NHD+ were synthesized, and cyclization in the presence of Aplysia ADP-ribosyl cyclase was studied. All 8-substituted NHD+ analogues were converted into their N1-cyclic forms by the enzyme, while in contrast, 7-deaza- NHD+ 17 was hydrolyzed into 7-deazainosine 5'-diphosphoribose (7-deaza- IDPR) 25. Correlations are made showing that the conformation of the NHD+ substrate is the key to successful cyclization. The pharmacological activities of these novel cIDPR derivatives were evaluated in both permeabilized and intact Jurkat T-lymphocytes. The results show that in permeabilized cells both 8-iodo 1g and 8-N3-N1-cIDPR 1d have an activity comparable to that of cADPR, while 8-iodo 1g and 8-phenyl-N1-cIDPR 1c have a small but significant effect in intact cells and can therefore be regarded as membrane-permeant; thus, cIDPR derivatives are emerging as important novel biological tools to study cADPR-mediated Ca2+ release in T-cells.
Structural Determinants for N1/N7 Cyclization of Nicotinamide Hypoxanthine 5‘-Dinucleotide (NHD+) Derivatives by ADP-Ribosyl Cyclase from Aplysia californica: Ca2+-Mobilizing Activity of 8-Substituted Cyclic Inosine 5‘-Diphosphoribose Analogues in T-Lymphocytes
摘要:
A series of nicotinamide hypoxanthine 5'-dinucleotide (NHD+) analogues modified at C-8 (2-5) and 7-deaza-NHD+ were synthesized, and cyclization in the presence of Aplysia ADP-ribosyl cyclase was studied. All 8-substituted NHD+ analogues were converted into their N1-cyclic forms by the enzyme, while in contrast, 7-deaza- NHD+ 17 was hydrolyzed into 7-deazainosine 5'-diphosphoribose (7-deaza- IDPR) 25. Correlations are made showing that the conformation of the NHD+ substrate is the key to successful cyclization. The pharmacological activities of these novel cIDPR derivatives were evaluated in both permeabilized and intact Jurkat T-lymphocytes. The results show that in permeabilized cells both 8-iodo 1g and 8-N3-N1-cIDPR 1d have an activity comparable to that of cADPR, while 8-iodo 1g and 8-phenyl-N1-cIDPR 1c have a small but significant effect in intact cells and can therefore be regarded as membrane-permeant; thus, cIDPR derivatives are emerging as important novel biological tools to study cADPR-mediated Ca2+ release in T-cells.
Structural Determinants for N1/N7 Cyclization of Nicotinamide Hypoxanthine 5‘-Dinucleotide (NHD<sup>+</sup>) Derivatives by ADP-Ribosyl Cyclase from <i>Aplysia </i><i>californica</i>: Ca<sup>2+</sup>-Mobilizing Activity of 8-Substituted Cyclic Inosine 5‘-Diphosphoribose Analogues in T-Lymphocytes
作者:Christelle Moreau、Gerd K. Wagner、Karin Weber、Andreas H. Guse、Barry V. L. Potter
DOI:10.1021/jm060275a
日期:2006.8.1
A series of nicotinamide hypoxanthine 5'-dinucleotide (NHD+) analogues modified at C-8 (2-5) and 7-deaza-NHD+ were synthesized, and cyclization in the presence of Aplysia ADP-ribosyl cyclase was studied. All 8-substituted NHD+ analogues were converted into their N1-cyclic forms by the enzyme, while in contrast, 7-deaza- NHD+ 17 was hydrolyzed into 7-deazainosine 5'-diphosphoribose (7-deaza- IDPR) 25. Correlations are made showing that the conformation of the NHD+ substrate is the key to successful cyclization. The pharmacological activities of these novel cIDPR derivatives were evaluated in both permeabilized and intact Jurkat T-lymphocytes. The results show that in permeabilized cells both 8-iodo 1g and 8-N3-N1-cIDPR 1d have an activity comparable to that of cADPR, while 8-iodo 1g and 8-phenyl-N1-cIDPR 1c have a small but significant effect in intact cells and can therefore be regarded as membrane-permeant; thus, cIDPR derivatives are emerging as important novel biological tools to study cADPR-mediated Ca2+ release in T-cells.