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Study of RNA structure by pyrene-labeled oligonucleotides
R Iwase1, H Tsuchida, T Yamaoka
1Department of Polymer Science and Engineering, Kyoto Institute of Technology, Japan.
Nucleic Acids Symposium Series
|January 1, 1997
Summary
Fluorescent probes with pyrenylmethyl uridine (Upy) show increased emission upon binding to RNA, not DNA. This property makes Upy-probes valuable for detecting single-stranded RNA regions.
Area of Science:
- Biochemistry
- Molecular Biology
- Oligonucleotide Chemistry
Background:
- Fluorescent labeling of oligonucleotides is crucial for molecular detection.
- Understanding hybridization interactions is key to developing sensitive probes.
Purpose of the Study:
- To investigate the fluorescent properties of oligonucleotides modified with 2'-(1-pyrenylmethyl) uridine (Upy).
- To assess the utility of Upy-modified probes for distinguishing between RNA and DNA targets.
Main Methods:
- Synthesis of fluorescently labeled oligonucleotides containing Upy.
- Hybridization assays with complementary oligoribonucleotides (ORN) and oligodeoxyribonucleotides (ODN).
- Spectroscopic analysis including fluorescence emission and UV melting curves.
- Circular dichroism (CD) spectroscopy to analyze pyrene group interactions.
Main Results:
- Upy-modified oligonucleotides exhibited a significant increase in fluorescence emission upon hybridization with ORN, but not ODN.
- UV melting curves showed decreased Tm values for Upy-ORN duplexes compared to unmodified duplexes.
- Induced CD intensity related to pyrene groups was reduced in Upy-ORN duplexes, suggesting release from stacking interactions.
Conclusions:
- The observed fluorescence changes indicate that pyrene groups are released from stacking interactions during hybridization with RNA.
- Upy-probes adjacent to guanine (G) or cytosine (C) are effective for detecting single-stranded RNA regions.