Chemical synthesis and biological investigation of a 77-mer oligoribonucleotide with a sequence corresponding to E. coli tRNA(Asp) |
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| Authors: | Persson T Kutzke U Busch S Held R Hartmann R K |
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| Institution: | 1. Max-Planck Institut für Experimentelle Medizin, Hermann-Rein-Straße 3, D-37075 Göttingen, Germany;2. Medizinische Universität zu Lübeck, Institut für Biochemie, Ratzeburger Alle 160, D-23538 Lübeck, Germany;1. Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA;2. Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA;3. AllTranz, Lexington, KY 40505, USA;4. Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA |
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| Abstract: | A 77-mer RNA with the sequence of Eschlerichia coli tRNA(Asp) has been chemically synthesised using standard automated phosphoramidite chemistry with the coupling reagent 4,5-dicyanoimidazole (DCI). The synthesis was carried out on a 1000 A CPG-column and. after deprotection and gel purification, a yield of about 7 mmol with a purity of > 95% was reproducibly obtained. By comparing automated synthesis of the 77-mer RNA using 1H-tetrazole and DCI as activator, DCI is advantageous in producing longer RNAs. However, for shorter RNAs ( <40 mer) no difference could be observed. In addition to the all-ribo tRNA(Asp) carrying the wild-type sequence, two variants were synthesised, one with a single C to G48 mutation and the second with a 2'-deoxy modification at C48. The three tRNAs were tested for their aminoacylation efficiency and high affinity binding to E. coli RNase P RNA. The results demonstrate that chemically synthesised 77-mer oligoribonucleotides can be successfully used for structure function studies. |
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