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Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution
Published on: July 8, 2019
Stem-loop structures can effectively substitute for an RNA pseudoknot in -1 ribosomal frameshifting.
Chien-Hung Yu1, Mathieu H Noteborn, Cornelis W A Pleij
1Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands.
Nucleic Acids Research
|August 2, 2011
Summary
Programmed ribosomal frameshifting (-1 PRF) in Simian retrovirus type-1 (SRV-1) is influenced by RNA structures. Hairpins, even without triple helix formation, can stimulate frameshifting, with loop and stem features affecting efficiency.
Area of Science:
- Molecular Biology
- Virology
- Structural Biology
Background:
- Programmed ribosomal frameshifting (-1 PRF) is crucial for synthesizing viral polyproteins, as seen in Simian retrovirus type-1 (SRV-1).
- H-type pseudoknots, forming triple helices, were previously identified as key stimulators of -1 PRF in SRV-1.
- Mutations affecting triple helix formation in SRV-1 pseudoknots confirmed their role in -1 PRF.
Purpose of the Study:
- To investigate the frameshifting efficiency of hairpin structures with base-pair composition similar to the SRV-1 gag-pro pseudoknot.
- To determine the influence of hairpin structural features, such as thermodynamic stability, loop size/composition, and stem irregularities, on -1 PRF.
- To compare the frameshifting efficiency of different tetraloops, including GAAA and UUCG motifs.
Main Methods:
- Construction and analysis of approximately 30 different hairpin RNA constructs.
- Assessment of frameshifting efficiency in relation to hairpin secondary structure.
- Comparative analysis of frameshifting activity based on loop sequence (GAAA, UUCG) and stem stability.
Main Results:
- Hairpin structures, lacking triple helix formation capability, effectively stimulated -1 PRF.
- Hairpin thermodynamic stability, loop characteristics (size and composition), and stem irregularities significantly influenced frameshifting efficiency.
- Hairpins containing the GAAA tetraloop exhibited significantly lower frameshifting efficiency compared to other hairpins, including those with the UUCG motif.
Conclusions:
- RNA hairpins can act as potent stimulators of -1 PRF, independent of triple helix formation.
- Specific structural determinants within hairpins, including loop and stem features, modulate frameshifting efficiency.
- The GAAA tetraloop appears less conducive to efficient frameshifting compared to other motifs, suggesting sequence-specific roles in regulating translation.
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