摘要:
D-ribo-2,5-anhydro-1,3-dideoxy-1-(((dihydroxyphosphinyl)oxy) hydroxyphosphininyl)-6-phorylhexitol, compound 4, along with 25% of its D-arabino epimer, was synthesized in 10 steps from 2-deoxyribonolactone. Compound 4 represents the 2-deoxy analog of the central metabolite 5-phosphorylribose 1-alpha-diphosphate (PRPP). The analog is a competitive inhibitor of yeast orotate phosphoribosyltransferase (PRTase) with K-i/K-m(PRPP) = 24 and is thus comparable to other C-glycosylphosphonyl PRPP analogs reported previously (R. W. McClard, and J. F. Witte (1990) Bioorg. Chem. 18, 165-178). The analog is an even better inhibitor of both human hypoxanthine-guanine PRTase and glutamine:amido PRTase from Escherichia coli with K-i/K-m(PRPP) values of 16 and 3, respectively. These results support the argument that the cis-diol grouping of nucleotides (or PRPP) plays a very minor role in binding of these substrates to PRTases. (C) 1996 Academic Press, Inc.