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Article: Parallel Folding Topology-Selective Label-Free Detection and Monitoring of Conformational and Topological Changes of Different G-Quadruplex DNAs by Emission Spectral Changes via FRET of mPPE-Ala–Pt(II) Complex Ensemble
Title | Parallel Folding Topology-Selective Label-Free Detection and Monitoring of Conformational and Topological Changes of Different G-Quadruplex DNAs by Emission Spectral Changes via FRET of mPPE-Ala–Pt(II) Complex Ensemble |
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Authors | |
Issue Date | 2016 |
Publisher | Royal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/publishing/journals/sc/About.asp |
Citation | Chemical Science, 2016, v. 7 n. 4, p. 2842-2855 How to Cite? |
Abstract | The formation of supramolecular assemblies between [Pt(bzimpy-Et){C[triple bond, length as m-dash]CC6H4(CH2NMe3-4)}]Cl2 (1) and mPPE-Ala and the FRET properties of the ensemble have been revealed from the UV-vis absorption, steady-state emission and time-resolved emission decay studies. The two-component mPPE-Ala–1 ensemble has been employed in a “proof-of-principle” concept for label-free detection of G-quadruplex DNAs with the intramolecular propeller parallel folding topology, such as c-myc, in aqueous buffer solution. By the modulation of the aggregation/deaggregation of the polymer–metal complex aggregates and hence the FRET from the mPPE-Ala donor to the aggregated 1 as acceptor, the ensemble has been demonstrated for sensitive and selective label-free detection of c-myc via the monitoring of emission spectral changes of the ensemble. Ratiometric emission of the ensemble at 461 and 662 nm has been shown to distinguish the intramolecular propeller parallel G-quadruplex folding topology of c-myc from other G-quadruplex-forming sequences of different folding topologies, owing to the strong and specific interactions between c-myc and 1 as suggested by the UV-vis absorption and UV melting studies. In addition, the formation of high-order intermolecular multimeric G-quadruplexes from c-myc under molecular crowding conditions has been successfully probed by the ratiometric emission of the ensemble. The conformational and topological transition of human telomeric DNA from the mixed-hybrid form to the intramolecular propeller parallel form, as observed from the circular dichroism spectroscopy, has also been monitored by the ratiometric emission of the ensemble. The ability of the ensemble to detect these conformational and topological transitions of G-quadruplex DNAs has been rationalized by the excellent selectivity and sensitivity of the ensemble towards the intramolecular propeller parallel G-quadruplex DNAs and their high-order intermolecular multimers, which are due to the extra stabilization gained from Pt⋯Pt and π–π interactions in addition to the electrostatic and hydrophobic interactions found in the polymer–metal complex aggregates. |
Persistent Identifier | http://hdl.handle.net/10722/231667 |
ISSN | 2023 Impact Factor: 7.6 2023 SCImago Journal Rankings: 2.333 |
PubMed Central ID | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chan, K | - |
dc.contributor.author | Chung, CYS | - |
dc.contributor.author | Yam, VWW | - |
dc.date.accessioned | 2016-09-20T05:24:44Z | - |
dc.date.available | 2016-09-20T05:24:44Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | Chemical Science, 2016, v. 7 n. 4, p. 2842-2855 | - |
dc.identifier.issn | 2041-6520 | - |
dc.identifier.uri | http://hdl.handle.net/10722/231667 | - |
dc.description.abstract | The formation of supramolecular assemblies between [Pt(bzimpy-Et){C[triple bond, length as m-dash]CC6H4(CH2NMe3-4)}]Cl2 (1) and mPPE-Ala and the FRET properties of the ensemble have been revealed from the UV-vis absorption, steady-state emission and time-resolved emission decay studies. The two-component mPPE-Ala–1 ensemble has been employed in a “proof-of-principle” concept for label-free detection of G-quadruplex DNAs with the intramolecular propeller parallel folding topology, such as c-myc, in aqueous buffer solution. By the modulation of the aggregation/deaggregation of the polymer–metal complex aggregates and hence the FRET from the mPPE-Ala donor to the aggregated 1 as acceptor, the ensemble has been demonstrated for sensitive and selective label-free detection of c-myc via the monitoring of emission spectral changes of the ensemble. Ratiometric emission of the ensemble at 461 and 662 nm has been shown to distinguish the intramolecular propeller parallel G-quadruplex folding topology of c-myc from other G-quadruplex-forming sequences of different folding topologies, owing to the strong and specific interactions between c-myc and 1 as suggested by the UV-vis absorption and UV melting studies. In addition, the formation of high-order intermolecular multimeric G-quadruplexes from c-myc under molecular crowding conditions has been successfully probed by the ratiometric emission of the ensemble. The conformational and topological transition of human telomeric DNA from the mixed-hybrid form to the intramolecular propeller parallel form, as observed from the circular dichroism spectroscopy, has also been monitored by the ratiometric emission of the ensemble. The ability of the ensemble to detect these conformational and topological transitions of G-quadruplex DNAs has been rationalized by the excellent selectivity and sensitivity of the ensemble towards the intramolecular propeller parallel G-quadruplex DNAs and their high-order intermolecular multimers, which are due to the extra stabilization gained from Pt⋯Pt and π–π interactions in addition to the electrostatic and hydrophobic interactions found in the polymer–metal complex aggregates. | - |
dc.language | eng | - |
dc.publisher | Royal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/publishing/journals/sc/About.asp | - |
dc.relation.ispartof | Chemical Science | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Parallel Folding Topology-Selective Label-Free Detection and Monitoring of Conformational and Topological Changes of Different G-Quadruplex DNAs by Emission Spectral Changes via FRET of mPPE-Ala–Pt(II) Complex Ensemble | - |
dc.type | Article | - |
dc.identifier.email | Chung, CYS: cyschung@hku.hk | - |
dc.identifier.email | Yam, VWW: wwyam@hku.hk | - |
dc.identifier.authority | Chung, CYS=rp02672 | - |
dc.identifier.authority | Yam, VWW=rp00822 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1039/c5sc04563k | - |
dc.identifier.pmid | 30090278 | - |
dc.identifier.pmcid | PMC6055111 | - |
dc.identifier.scopus | eid_2-s2.0-84962293379 | - |
dc.identifier.hkuros | 265044 | - |
dc.identifier.volume | 7 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | 2842 | - |
dc.identifier.epage | 2855 | - |
dc.identifier.isi | WOS:000372614800050 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 2041-6520 | - |