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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
Molecular recognition of single-stranded RNA: neomycin binding to poly(A)
Hongjuan Xi1, David Gray, Sunil Kumar
1Department of Chemistry, Clemson University, Clemson, SC 29634, USA.
FEBS Letters
|June 13, 2009
Summary
Neomycin antibiotic binds to poly(A) sequences, crucial for mRNA stability. This interaction stabilizes the poly(A) duplex, offering new insights into nucleic acid targeting by antibiotics.
Area of Science:
- Molecular Biology
- Biochemistry
- Pharmacology
Background:
- Poly(A) sequences are vital for mRNA stability and translation initiation.
- Neomycin, an aminoglycoside antibiotic, is known to interact with nucleic acid structures.
Purpose of the Study:
- To investigate the binding interaction between neomycin and poly(A) oligonucleotides.
- To determine the effect of neomycin on the stability of poly(A) duplexes.
Main Methods:
- Circular Dichroism (CD) spectroscopy
- Melting temperature experiments
- Oligonucleotide binding assays (K(d) determination)
Main Results:
- Neomycin binds to single-stranded poly(A) oligonucleotides (A(30)) with a dissociation constant (K(d)) in the micromolar range.
- CD melting experiments confirmed complex formation and indicated a melting temperature of 47°C for the neomycin-poly(A) complex.
- Neomycin significantly stabilized the poly(A) duplex, increasing its melting temperature from 44°C to 61°C at pH 5.5.
Conclusions:
- Neomycin exhibits strong binding affinity for poly(A) sequences.
- Neomycin effectively stabilizes poly(A) duplexes, suggesting a potential mechanism for its interaction with RNA.
- These findings contribute to understanding neomycin's molecular targets and its effects on RNA structure and function.
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