TY - JOUR
T1 - Isozyme-dependent sensitivity of adenylyl cyclases to P-site-mediated inhibition by adenine nucleosides and nucleoside 3'-polyphosphates
AU - Johnson, Roger A.
AU - Désaubry, Laurent
AU - Bianchi, Glen
AU - Shoshani, Ilana
AU - Lyons, Edward
AU - Taussig, Ronald
AU - Watson, Peter A.
AU - Cali, James J.
AU - Krupinski, John
AU - Pieroni, Joseph P.
AU - Iyengar, Ravi
PY - 1997/4/4
Y1 - 1997/4/4
N2 - Recombinant adenylyl cyclase isozyme Types I, II, VI, VII, and three splice variants of Type VIII were compared for their sensitivity to P-site- mediated inhibition by several adenine nucleoside derivatives and by the family of recently synthesized adenine nucleoside 3'-polyphosphates (Desaubry, L., Shoshani, I., and Johnson, R. A. (1996) J. Biol. Chem. 271, 14028-14034). Inhibitory potencies were dependent on isozyme type, the mode of activation of the respective isozymes, and on P-site ligand. For the nucleoside derivatives potency typically followed the order 2',5'- dideoxyadenosine (2',5'-ddAdo) > β-adenosine > 9-(cyclopentyl)-adenine (9- CP-Ade) ≤ 9-(tetrahydrofuryl)-adenine (9-TRF-Ade; SQ 22,536), with the exception of Type II adenylyl cyclase, which was essentially insensitive to inhibition by 9-CP-Ade. For the adenine nucleoside 3'-polyphosphates inhibitory potency followed the order Ado < 2'-dAdo < 2',5'-ddAdo and 3'- mono- < 3'-di- < 3'-triphosphate. Differences in potency of these ligands were noted between isozymes. The most potent ligand was 2',5'-dd-3'-ATP with IC50 values of 40-300 nM. The data demonstrate isozyme selectivity for some ligands, suggesting the possibility of isozyme-selective inhibitors to take advantage of differences in P-site domains among adenylyl cyclase isozymes. Differential expression of adenylyl cyclase isozymes may dictate the physiological sensitivity and hence importance of this regulatory mechanism in different cells or tissues.
AB - Recombinant adenylyl cyclase isozyme Types I, II, VI, VII, and three splice variants of Type VIII were compared for their sensitivity to P-site- mediated inhibition by several adenine nucleoside derivatives and by the family of recently synthesized adenine nucleoside 3'-polyphosphates (Desaubry, L., Shoshani, I., and Johnson, R. A. (1996) J. Biol. Chem. 271, 14028-14034). Inhibitory potencies were dependent on isozyme type, the mode of activation of the respective isozymes, and on P-site ligand. For the nucleoside derivatives potency typically followed the order 2',5'- dideoxyadenosine (2',5'-ddAdo) > β-adenosine > 9-(cyclopentyl)-adenine (9- CP-Ade) ≤ 9-(tetrahydrofuryl)-adenine (9-TRF-Ade; SQ 22,536), with the exception of Type II adenylyl cyclase, which was essentially insensitive to inhibition by 9-CP-Ade. For the adenine nucleoside 3'-polyphosphates inhibitory potency followed the order Ado < 2'-dAdo < 2',5'-ddAdo and 3'- mono- < 3'-di- < 3'-triphosphate. Differences in potency of these ligands were noted between isozymes. The most potent ligand was 2',5'-dd-3'-ATP with IC50 values of 40-300 nM. The data demonstrate isozyme selectivity for some ligands, suggesting the possibility of isozyme-selective inhibitors to take advantage of differences in P-site domains among adenylyl cyclase isozymes. Differential expression of adenylyl cyclase isozymes may dictate the physiological sensitivity and hence importance of this regulatory mechanism in different cells or tissues.
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U2 - 10.1074/jbc.272.14.8962
DO - 10.1074/jbc.272.14.8962
M3 - Article
C2 - 9083018
AN - SCOPUS:1842335067
SN - 0021-9258
VL - 272
SP - 8962
EP - 8966
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 14
ER -