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RNA ligands to human nerve growth factor
J Binkley1, P Allen, D M Brown
1Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309-0347, USA.
Nucleic Acids Research
|August 25, 1995
Summary
Researchers developed high-affinity RNA ligands for nerve growth factor (NGF) using SELEX. These novel RNA molecules show potential as diagnostic tools for studying NGF, a key neurotrophic protein.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- Nerve growth factor (NGF) is essential for neuronal development.
- NGF is not known to naturally bind nucleic acids.
- The SELEX method enables the selection of specific RNA ligands.
Purpose of the Study:
- To select high-affinity RNA ligands that bind to human nerve growth factor (NGF).
- To characterize the binding properties and structures of selected RNA molecules.
- To explore the potential of these RNA ligands as diagnostic tools for NGF.
Main Methods:
- Systematic Evolution of Ligands by Exponential Enrichment (SELEX) was employed to identify RNA binders.
- Characterization of RNA structure, including pseudoknot formation and hairpin-loops.
- Assessment of binding affinities and salt concentration effects on RNA-NGF interactions.
Main Results:
- Two distinct RNA ligands with high affinity for NGF were identified.
- One RNA ligand exhibits a structured pseudoknot, conferring salt-resistant binding.
- The second RNA ligand is unstructured, with binding inhibited by high salt concentrations.
- These RNA ligands compete for NGF binding, indicating specific interaction sites.
Conclusions:
- Novel RNA molecules can be selected to bind specifically to NGF, a protein not known to interact with nucleic acids.
- The structural characteristics of RNA ligands influence their binding stability and affinity.
- These findings highlight the potential of RNA aptamers as diagnostic and research tools for neurotrophic factors like NGF.