Dynamics of tRNAtyr Probed with Long-Lifetime Metal-Ligand Complexes |
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Authors: | Woo Suk Hwang Yun Hong Jung Woo Sung Son Byeng Wha Son Jung Sook Kang |
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Institution: | 1. Department of Oral Biochemistry and Molecular Biology, School of Dentistry, Pusan National University, Yangsan, 626-870, South Korea 2. Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan, 626-870, South Korea 3. Department of Chemistry, Pukyong National University, Busan, 608-737, South Korea
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Abstract: | The metal-ligand complexes, Ru(bpy)2(dppz)]2+ (bpy = 2,2??-bipyridine, dppz = dipyrido3,2-a:2??,3??-c]phenazine) (RuBD) and Ru(phen)2(dppz)]2+ (phen = 1,10-phenanthroline) (RuPD), display favorable photophysical properties including long lifetime, polarized emission, and very little background fluorescence. To check if RuBD and RuPD reflect the overall rotational mobility of small nucleic acid, we measured the intensity and anisotropy decays of RuBD and RuPD when intercalated into tRNAtyr using pBC SK(+) phagemid as a control. We used frequency-domain fluorometry with a blue light-emitting diode (LED) as the modulated light source. We observed shorter lifetimes for tRNAtyr than those for the pBC SK(+) phagemid for both probes, however, RuPD showed much larger decrease in the mean lifetime values (64%). The slow rotational correlation time of RuBD (31.3 ns) and the fast rotational correlation time of RuPD (26.0 ns) reflected the overall rotational mobility of tRNAtyr. In addition, the steady-state anisotropy and time-resolved anisotropy decay data showed a clear difference between tRNAtyr and pBC SK(+) phagemid. This suggests the possibility of a homogeneous assay for identifying target nucleic acids and/or nucleic acid binding proteins. |
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