title: Nucleotide specificity of stringent factor and the synthesis of analogs of guanosine 5'-diphosphate 3'-diphosphate and guanosine 5'-triphosphate 3'-diphosphate.
abstract: The ribosome-dependent stringent factor reaction was found to be nonspecific with regard to the number of phosphate groups linked to the 5' position of guanosine nucleotides. Both GMP and guanosine 5'-tetraphosphate could accept a pyrophosphoryl group from ATP although at a much lower rate than GDP or GTP. Guanosine 5'-monophosphate 3'-diphosphate and guanosine 5'-tetraphosphate 3'-diphosphate were the products of these reactions. Furthermore, 3'-linked analogs of guanosine 5'-diphosphate 3'-diphosphate and guanosine 5'-triphosphate 3'-diphosphate were synthesized from the corresponding ATP analog, adenosine 5'-O-(3-thiotriphosphate). The stringent factor catalyzed reverse reaction was found to be specific for guanosine 5'-diphosphate 3'-diphosphate, and was essentially inactive to the isomeric form, guanosine 5'-diphosphate 2'-diphosphate.
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D002855:Chromatography, Thin Layer; D004926:Escherichia coli / Q000378:metabolism*; D006150:Guanine Nucleotides / Q000096:biosynthesis*; D007700:Kinetics; D012270:Ribosomes / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013997:Time Factors
chemical_list: D001426:Bacterial Proteins; D006150:Guanine Nucleotides