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An ELISA Based Binding and Competition Method to Rapidly Determine Ligand-receptor Interactions

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RAID3--An interleukin-6 receptor-binding aptamer with post-selective modification-resistant affinity.

Florian Mittelberger¹, Cindy Meyer², Georg H Waetzig³

¹a Institute for Biochemistry and Molecular Biology ; Department of Chemistry ; University of Hamburg ; Hamburg , Germany.

|September 19, 2015

Summary

This summary is machine-generated.

Modified RNA aptamers targeting the interleukin-6 receptor (IL-6R) show enhanced stability and maintain binding affinity. This breakthrough overcomes aptamer degradation issues, paving the way for new therapeutic applications.

Keywords:

Aptamers Interleukin-6 receptor SAXS cell biology cytokine signaling internalization molecular modelling post-selective modification protein-RNA interactions

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Published on: March 14, 2016

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Area of Science:

Biochemistry
Molecular Biology
Drug Discovery

Background:

Aptamers are highly specific nucleic acid ligands with therapeutic potential.
Aptamers face challenges due to degradation by serum nucleases.
Post-selective modification of aptamers is difficult and can impair binding.

Purpose of the Study:

To select and characterize an RNA aptamer targeting a novel site on the interleukin-6 receptor (IL-6R).
To develop a post-selective modification strategy to enhance aptamer stability without compromising affinity.
To investigate the structural properties and binding characteristics of the modified aptamer.

Main Methods:

Selection of a 34-nucleotide RNA aptamer against IL-6R domain 3.
Structural analysis using small-angle X-ray scattering.
Post-selective modification by replacing pyrimidines with 2'-fluoro analogs.
Affinity testing for both membrane-bound and soluble IL-6R.

Main Results:

Aptamer selection and characterization were successful.
Post-selective modification with 2'-fluoro pyrimidines significantly increased aptamer stability.
The modified aptamer retained high affinity for IL-6R.
The aptamer could be truncated to its minimal binding motif without affinity loss.

Conclusions:

Post-selective modification is a viable strategy to enhance aptamer stability and therapeutic potential.
The developed 2'-fluoro modified aptamer is a promising candidate for IL-6R targeting therapies.
The findings facilitate the development of more robust aptamer-based drugs.