title: Inhibition of vaccinia RNA guanine 7-methyltransferase by compounds designed as multisubstrate adducts.
abstract: Several potential inhibitors of mRNA guanine 7-methyltransferase, which were designed from mechanism-based considerations, were evaluated against the vaccinia virus capping enzyme complex. Of the compounds tested, 5'-deoxy-5'[6-(2-aminopyrrolo[2,3-d]-pyrimidine-4-one) methylthio]adenosine (9) had good selective inhibitory activity against vaccinia mRNA guanine 7-methyltransferase, exhibiting an IC50 of 9.2 X 10(-5) M. Structure-activity considerations suggest that specific inhibition of RNA methyltransferases by low molecular weight multisubstrate adduct inhibitors may be achievable.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D008780:Methyltransferases / Q000037:antagonists & inhibitors*; D010625:Phenylethanolamine N-Methyltransferase / Q000378:metabolism; D013329:Structure-Activity Relationship; D014616:Vaccinia virus / Q000201:enzymology*
chemical_list: D008780:Methyltransferases; D010625:Phenylethanolamine N-Methyltransferase; C055097:mRNA (guanine(N7))-methyltransferase