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Structure and aminoacylation capacities of tRNA transcripts containing deoxyribonucleotides
R Aphasizhev1, A Théobald-Dietrich, D Kostyuk
1UPR 9002, IBMC du CNRS, Strasbourg, France.
RNA (New York, N.Y.)
|August 1, 1997
Summary
The ribose 2'-hydroxyl groups in transfer RNAs (tRNAs) are crucial for their tertiary structure and aminoacylation identity. Replacing them with deoxyribonucleotides reveals specific hydroxyls critical for function.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- The precise role of ribose 2 extquotesingle-hydroxyl groups in RNA structure and function remains a subject of debate.
- Transfer RNAs (tRNAs) are essential molecules involved in protein synthesis, undergoing aminoacylation to attach specific amino acids.
Purpose of the Study:
- To investigate the contribution of specific ribose 2 extquotesingle-hydroxyl groups to tRNA structure and aminoacylation.
- To utilize a mutant T7 RNA polymerase for synthesizing deoxyribonucleotide-containing RNAs.
Main Methods:
- Synthesis of deoxyribose-containing tRNAs using a mutant T7 RNA polymerase.
- Analysis of RNA structure using melting curves (temperature-gradient gel electrophoresis) and nuclease footprinting.
- Assessment of aminoacylation efficiency in vitro.
Main Results:
- Deoxyribose-containing RNAs maintain a global conformation similar to natural RNAs.
- Tertiary structure stability decreases, while secondary structure stability remains unchanged in deoxyribose-containing tRNAs.
- Aminoacylation efficiency is differentially affected by ribonucleotide substitutions, with specific residues (U11, G27 in tRNA(Asp); dG, dC in tRNA(Met)) showing significant decreases.
Conclusions:
- Specific ribose 2 extquotesingle-hydroxyl groups are critical determinants for aminoacylation identity in tRNAs.
- The study highlights the importance of these hydroxyls in maintaining tertiary structure and interacting with synthetases.