title: Synthesis of stable aminoacyl-tRNA analogues containing triazole as a bioisoster of esters.
abstract: Aminoacyl-tRNAs have important roles in a variety of biological processes, including protein synthesis by ribosomes, targeting of proteins for degradation by the proteasome, and bacterial cell wall synthesis. Here we describe the synthesis of stable aminoacyl-tRNA analogues containing 1,4- and 1,5-substituted 1,2,3-triazole rings. The procedure involves i) Cu- and Ru-catalysed cycloadditions of 3'-azidoadenosine and alkynes, which produced the 1,4 and 1,5 regioisomers of the triazoles, respectively, ii) coupling between the resulting triazole-deoxyadenosine derivatives and a deoxycytidine phosphoramidite, and iii) the enzymatic ligation of the substituted dinucleotides with a 22 nt RNA microhelix that mimics the acceptor arm of tRNA. Nucleoside and nucleotide compounds were characterized by MS spectrometry and (1)H, (31)P and (13)C NMR spectroscopy and were assayed for inhibition of FemX(Wv), an alanyltransferase essential for the formation of the peptidoglycan network of gram-positive bacterial pathogens. The low IC(50) values obtained (2 to 4 microM) indicate that the five-membered triazole rings acted as bioisosters of esters and can be used for the design of stable aminoacyl-tRNA analogues.
authors.affiliation: UMR 7613, Synthèse, Structure et Fonction de Molécules Bioactives, Université Pierre et Marie Curie, 4 place Jussieu, case 179, 75 252 Paris Cedex, France.
authors.forename: Maryline
authors.initials: M
authors.lastname: Chemama
authors.forename: Matthieu
authors.initials: M
authors.lastname: Fonvielle
authors.forename: Michel
authors.initials: M
authors.lastname: Arthur
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Valéry
authors.forename: Mélanie
authors.initials: M
authors.lastname: Etheve-Quelquejeu
mesh_terms: D019881:Aminoacyltransferases / Q000037:antagonists & inhibitors*; D001483:Base Sequence; D004952:Esters; D020128:Inhibitory Concentration 50; D008954:Models, Biological; D008956:Models, Chemical; D015394:Molecular Structure; D012346:RNA, Transfer, Amino Acyl / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014230:Triazoles / Q000737:chemistry*
chemical_list: D004952:Esters; D012346:RNA, Transfer, Amino Acyl; D014230:Triazoles; D019881:Aminoacyltransferases