title: Synthesis and enzymic activity of 8-acyl and 8-alkyl derivatives of guanosine 3, 5-cyclic phosphate.
abstract: Several new 8-alkyl and 8-acyl derivatives of quanosie 3',5'-cyclic phosphate (cGMP) and inosine 3',5'-cyclic phosphate (cGMP) were prepared by direct alkylation or acylation of the parent cyclic nucleotide via free radicals generated in situ. These compounds have been examined for their ability to stimulate a cGMP-dependent protein kinase, and several of the cGMP derivatives were as active in this regard as cGMP. These compounds proved to be quite ineffective when tested for their ability to activate an adenosine 3',5'-cyclic phosphate (cAMP) dependent protein kinase. In addition, these 8-substituted cGMP derivatives are not substrates for a phosphodiesterase preparation from rabbit kidney, but do show inhibition of the hydrolysis of cAMP by crude phosphodiesterase preparations from rabbit lung and beef heart.
mesh_terms: D000818:Animals; D002417:Cattle; D002852:Chromatography, Ion Exchange; D006152:Cyclic GMP / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008168:Lung / Q000201:enzymology; D009206:Myocardium / Q000201:enzymology; D008121:Nephropidae / Q000201:enzymology; D009928:Organ Specificity; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism; D011494:Protein Kinases / Q000378:metabolism; D011817:Rabbits; D013045:Species Specificity; D013329:Structure-Activity Relationship
chemical_list: D011494:Protein Kinases; D010727:Phosphoric Diester Hydrolases; D006152:Cyclic GMP