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.
J Med Chem
; 49(17): 5162-76, 2006 Aug 24.
Article
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| MEDLINE
| ID: mdl-16913705
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.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Aplysia
/
Linfocitos T
/
Calcio
/
IMP Cíclico
/
ADP-Ribosil Ciclasa
/
Inosina Difosfato
Límite:
Animals
/
Humans
Idioma:
En
Revista:
J Med Chem
Asunto de la revista:
QUIMICA
Año:
2006
Tipo del documento:
Article
País de afiliación:
Reino Unido
Pais de publicación:
Estados Unidos