期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 13, 页码 2259-2266出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz501040a
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资金
- National Natural Science Foundation of China [21333012, 21373233]
- National Basic Research Program of China [2013CB834602]
- Chinese Academy of Sciences [XDB12020200]
We report a new transient spectral method utilizing triplet excited state as sensitive reporters to monitor and differentiate the multiplex G-quadruplex/ligand interactions in a single assay, which is a difficult task and usually requires a combination of several techniques. From a systematic study on the interactions of porphyrin (TMPyP4) with each telomeric G-quadruplex: AG(3)(T(2)AG(3))(3), G(2)T(2)G(2)TGTG(2)T(2)G(2), (G(4)T(4)G(4))(2), and (TG(4)T)(4), it is convincingly shown that the ligand triplet decay lifetimes are sensitive to the local bound microenviromnent within G-quadruplexes, from which the coexisting binding modes of end-stacking, intercalation, and sandwich are distinguished and their respective contribution are determined. The complete scenario of mixed interaction modes is thus revealed, shedding light on the past controversial issues. Additional control experiments demonstrate the sensitivity of this triplet reporter method, which can even capture the binding behavior change as the G-quadruplex structures are adjusted by Na+ or K+.
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