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![[Figure 2]](ig5064fig2mag.jpg)
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Figure 2
Schematic diagram of nucleic acid X-ray footprinting experiments. RNA folding experiments are an example application of X-ray footprinting. These experiments involve exposing unfolded and folded RNA samples to a focused X-ray beam, which produces hydroxyl radicals that cleave the phosphodiester backbone of the RNA molecule. The resulting nucleic acid fragments are analysed using gel electrophoresis. Missing regions observed on the sequencing gel for the folded sample indicate regions that become protected, or inaccessible to solvent (i.e. hydroxyl-radical cleavage), upon the unfolded RNA molecule assuming its folded state. |
![[Figure 2]](ig5064fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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