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- W1969452229 abstract "Hydrolysis of cyclic AMP and cyclic GMP analogues by a purified cGMP-stimulated phosphodiesterase from bovine adrenal tissue was investigated by reversed-phase HPLC. The results indicate that both a negative charge and an equatorial oxygen atom located at the cyclic phosphate residue are absolute requirements for the process of hydrolysis. Ohter substituents only gradually decreased the apparent hydrolytic activity. C-8-substituted derivatives were generally poor substrates due to the limited ability of these compounds to rotate freely around the glycosidic bond. While C-6- and 0–2′-substituted analogues carrying bulky substituents were also poorly hydrolysed, all other derivatives, including different C-2-, C-6-, 0–3′- and 0–5′-modified cyclic nucleotides, were good substrates. We consistently observed that cyclic GMP and cyclic GMP analogues were better hydrolysed than the corresponding cyclic AMP analogues. Hydrolysis was correlated with neither the hydrogen bond donor/acceptor abilities nor the hydrophobicity of selected cyclic nucleotide analogues. Based on quantum-chemical calculations of the size and direction of the dipole moments of different purine bases, we propose that the polarization of inducible amino acid side-chains within the binding site is involved in the differential binding of adenine-derived and guanine-derived nucleotides. However, the size of the dipole moment alone is not sufficient to explain the observed cGMP-preference. Rather, the direction of the polarization power relative to the other molecular structures involved in binding and hydrolysis seems to be the molecular mechanism by which the enzyme is able to discriminate between cAMP- and cGMP-like structures." @default.
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- W1969452229 date "1986-06-01" @default.
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- W1969452229 title "Hydrolysis of cyclic nucleotides by a purified cGMP-stimulated phosphodiesterase: structural requirements for hydrolysis" @default.
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- W1969452229 doi "https://doi.org/10.1016/0167-4838(86)90174-3" @default.
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