title: Phosphorothioate analogues of 5-phosphoribosyl 1-diphosphate: synthesis, purification, and partial characterization.
abstract: The 1-phosphorothioate analogues of 5-phosphoribosyl 1-diphosphate (P-Rib-PP) have been prepared enzymatically, in reactions catalyzed by P-Rib-PP synthetase from Salmonella typhimurium. 5-Phosphoribosyl 1-O-(2-thiodiphosphate) (P-Rib-PP beta S) was synthesized from ribose 5-phosphate (Rib-5-P) and the Mg2+ complex of adenosine 5'-O-(3-thiotriphosphate). The SP and RP diastereomers of 5-phosphoribosyl 1-O-(1-thiodiphosphate) (P-Rib-PP alpha S) were synthesized from Rib-5-P and the Mg2+ complex of adenosine 5'-O-(2-thiotriphosphate) (ATP beta S) (SP diastereomer, delta-configuration) and the Cd2+ complex of ATP beta S (RP diastereomer, delta-configuration), respectively. The strategy for the synthesis and stereochemical assignment of the P-Rib-PP alpha S diastereomers was based on the specificity of P-Rib-PP synthetase for the (delta)-beta, gamma-bidentate metal-nucleotide substrate and the stereochemical course of the synthetase reaction, leading to inversion of configuration at the P beta atom of the nucleotide [Li, T. M., Mildvan, A. S., & Switzer, R. L. (1978) J. Biol. Chem. 253, 3918-3923], and the known configurations of the Mg2+ and Cd2+ beta, gamma-bidentate complexes of the ATP beta S diastereomers [Jaffe, E. K., & Cohn, M. (1979) J. Biol. Chem. 254, 10839-10845]. The P-Rib-PP analogues were purified by gradient elution from DEAE-Sephadex and characterized by chemical analysis and 31P nuclear magnetic resonance [Smithers, G. W., & O'Sullivan, W. J. (1984) Biochemistry (following paper in this issue)]. A preliminary account of their interaction with human brain hypoxanthine phosphoribosyltransferase and yeast orotate phosphoribosyltransferase (OPRTase) is described.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D001921:Brain / Q000201:enzymology; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism; D009962:Orotate Phosphoribosyltransferase / Q000378:metabolism; D010428:Pentosephosphates / Q000138:chemical synthesis*; D010754:Phosphoribosyl Pyrophosphate / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000378:metabolism; D010770:Phosphotransferases / Q000378:metabolism*; D012268:Ribose-Phosphate Pyrophosphokinase / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology; D012486:Salmonella typhimurium / Q000201:enzymology*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D010428:Pentosephosphates; D010754:Phosphoribosyl Pyrophosphate; C043610:5-phosphoribosyl 1-O-(2-thiodiphosphate); C043611:5-phosphoribosyl 1-O-(1-thiodiphosphate); D009962:Orotate Phosphoribosyltransferase; D007041:Hypoxanthine Phosphoribosyltransferase; D010770:Phosphotransferases; D012268:Ribose-Phosphate Pyrophosphokinase