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Action spectra for UV-light induced RNA–RNA crosslinking in 16S ribosomal RNA in the ribosome

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Abstract

UV irradiation induces intramolecular crosslinks in ribosomal RNA in the ribosome. These crosslinks occur between nucleotides distant in primary sequence and they are specific, limited in number and have crosslinking efficiencies sufficient to allow their use in monitoring conformational changes. In this work, the frequency of crosslinking for eight 16S rRNA crosslinks was determined as a function of wavelength of irradiation. For six of the crosslinks, the action spectra correspond to the absorption spectra of at least one of the participating nucleotides. For a crosslink between nucleotides C967 and C1400 the maximum frequency of crosslinking occurs at wavelengths blue-shifted from the absorbance maximum of cytidine and for a crosslink between C1402 and C1501 the maximum frequency of crosslinking is red-shifted. Photoreversal of the crosslinks was also studied by deproteinizing crosslinked RNA under mild conditions and then re-irradiating it with specific wavelengths under conditions in which the crosslinks were reversed but not formed. The different crosslinks exhibit significantly different extents of photoreversal versus wavelength profiles. The differences in the crosslinking action spectra can be accounted for in the absorbance spectra of the nucleotides that are involved in the crosslink as well as by the photoreversal action spectra.

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Zhirnov, O.V., Wollenzien, P. Action spectra for UV-light induced RNA–RNA crosslinking in 16S ribosomal RNA in the ribosome. Photochem Photobiol Sci 2, 688–693 (2003). https://doi.org/10.1039/b208677h

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