Abstract
CD and absorption spectra are sensitive to the secondary structure of RNAs. By fitting the spectra contained in our basis set to the CD and absorption spectra of an RNA of known sequence, we could determine the fractions of base pairs, the fractions of each of the nearest neighbor base pairs, and the fractions of the single-stranded nucleotides in that RNA. The basis set included 58 CD and 58 absorption spectra. The fitting was done with a guided selection routine. The estimated error was about 0.05 for predicting the fractions of the nearest neighbor base pairs, 0.06 for predicting the fractions of A.U, G.C, and G.U base pairs, and 0.04 for predicting the fractions of the single-stranded nucleotides.
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