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Interaction between tumour necrosis factor alpha ribozyme and cellular proteins. Involvement in ribozyme stability
1Institute of Immunology and Rheumatology, Rikshospitalet, Oslo, Norway.
Journal of Molecular Biology
|October 7, 1994
Summary
Endogenous cellular proteins bind to tumor necrosis factor alpha ribozymes (TNF alpha-Rz), forming complexes that enhance stability and activity. This RNA-protein interaction identifies a novel epitope for improving RNA therapeutics.
Area of Science:
- Molecular Biology
- RNA Therapeutics
- Gene Expression Regulation
Background:
- Ribozymes are RNA molecules capable of cleaving other RNA, offering potential for gene expression inhibition.
- Intracellular stability is crucial for ribozyme efficacy; previous studies showed acquired resistance to degradation for TNF alpha-Rz.
- Understanding the mechanisms behind ribozyme stability is key to developing effective RNA-based therapies.
Purpose of the Study:
- To investigate the cause of acquired resistance to degradation in TNF alpha ribozymes (TNF alpha-Rz) in human cells.
- To identify endogenous cellular proteins that bind to TNF alpha-Rz and form stable complexes.
- To characterize the RNA-protein interaction and its impact on ribozyme stability, activity, and potential therapeutic applications.
Main Methods:
- Native gel electrophoresis to detect ribozyme-protein complexes in cytoplasmic extracts.
- RNase suppression and proteinase K treatment to assess complex formation and ribozyme integrity.
- Binding assays using ribozyme sub-fragments and modified constructs to map the protein binding site (epitope).
Main Results:
- Endogenous cellular proteins form stable complexes with TNF alpha-Rz, protecting it from degradation and recovering ~80% of input RNA.
- Protein binding occurs at a conformational epitope involving the 5' end and catalytic domain, requiring the ribose phosphate backbone.
- The identified protein binding is specific to TNF alpha-Rz, and covalent linkage to other ribozymes enhanced their stability and activity.
Conclusions:
- Endogenous protein binding significantly enhances the intracellular stability and activity of TNF alpha-Rz.
- The identified RNA epitope serves as a potential cassette for improving the in vivo performance of various RNA molecules.
- This study provides insights into RNA-protein interactions and offers a strategy for developing more robust RNA-based therapeutics.
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