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. 1998 Nov;4(11):1444–1454. doi: 10.1017/s1355838298980967

Determination of 2'-hydroxyl and phosphate groups important for aminoacylation of Escherichia coli tRNAAsp: a nucleotide analogue interference study.

C S Vörtler 1, O Fedorova 1, T Persson 1, U Kutzke 1, F Eckstein 1
PMCID: PMC1369716  PMID: 9814764

Abstract

2'-Deoxynucleoside 5'-a-thiotriphosphates have been incorporated randomly, replacing any of the four nucleotides separately and at a low level in Escherichia colitRNA(AsP)transcripts. After some tRNAs were charged with the cognate aminoacyl-tRNA synthetase and biotinylated, charged and uncharged tRNAs were separated by binding to Streptavidin. A comparison of the iodine cleavage pattern of charged and uncharged tRNAs indicated positions of 2'-deoxyphosphorothioate interference with charging. To separate the 2'-deoxy from the phosphorothioate effect, the same sequence of reactions was performed with the corresponding NTPalphaS. Several positions were identified with a 2'-deoxy or a phosphorothioate effect. tRNAs with single deoxy substitutions at the identified positions were prepared by enzymatic ligation of chemically synthesized halves. The kinetics of charging these tRNAs were determined. The 2'-deoxy effects identified by the interference assay were confirmed, showing a reduction in charging efficiency of between 2.5-6-fold, except for the terminal A76 with a 25-fold reduction. Inspection of the X-ray structure of the tRNA-synthetase complex showed consistency of most of these findings. Critical 2'-deoxy groups are localized mainly on the proposed contact surface with the synthetase or at the interface of the two tRNA domains. The same overall picture emerged for critical phosphorothioates. With the exception of 2'-deoxy-adenosine-containing tRNAs, multiple 2'-deoxy-substituted tRNAs, prepared by ligation of halves, showed a much larger reduction in charging efficiency than the mono-substituted tRNAs, indicating an additive effect.

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