Abstract
Electrophoresis in polyacrylamide gels containing both formamide and urea is a high-resolution technique for the analysis of crosslinked RNA species. Combined with a specific crosslinking agent like uv irradiation, it allows a rapid fingerprint of structural differences between RNA forms. The technique reveals significant differences in the pattern of uv crosslinking of free Escherichia coli 16 S ribosomal RNA compared with the RNA in active or inactive 30 S subunits. Ultraviolet photocrosslinks seen only in the 30 S particle are likely to be tertiary structure contacts.
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