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• W2006868662 abstract "Abstract The phosphorescence of brewers' yeast phenylalanine transfer RNA has been investigated at 77 °K and at 1.2 °K in pumped liquid helium. Although the phosphorescence at 77 °K originates almost completely from the Y base in the anticodon loop, independent of excitation wavelength, the phosphorescence originates from normal bases with 270 nm excitation at temperatures in the helium range. The low-temperature phosphorescence is assigned to the triplet state of adenosine by optical detection of magnetic resonance measurements. The adenosine phosphorescence at 1.2 °K is quenched by the binding of the codon poly(U), as well as by the removal of Mg 2+ . The former result indicates that the adenosine phosphorescence originates from the anticodon, -Gm-A-A-, while the second shows that a conformational change introduced by removing Mg 2+ (possibly involving unstacking of the anticodon) prevents energy trapping in the anticodon triplet state. The lack of triplet energy transfer from anticodon to Y indicates that Y cannot be stacked with the anticodon in the conformation that is stable at helium temperature. The adenosine phosphorescence of transfer RNA Phe is nearly completely quenched at 77 °K, at least partially due to energy transfer to Y. We think that the thermally activated energy transfer is associated with some mobility of the Y base at 77 °K. Our observations are in contrast with previous results on bakers' yeast tRNA Phe where there is apparently little, if any, energy transfer to Y from the normal nucleotides at 80 °K with 265 nm excitation. Optically detected magnetic resonance measurements on the triplet state of Y base in various environments indicate that removal of Mg 2+ causes a shift of the Y base in tRNA Phe to a more solvent-exposed position, whereas the binding of poly(U) has little effect on the environment of Y." @default.
• W2006868662 created "2016-06-24" @default.
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• W2006868662 date "1974-10-01" @default.
• W2006868662 modified "2023-09-26" @default.
• W2006868662 title "Study of the phosphorescent bases of yeast phenylalanine transfer RNA with the aid of optical detection of magnetic resonance" @default.
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• W2006868662 doi "https://doi.org/10.1016/0022-2836(74)90525-7" @default.
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