NMR structure of a 4 x 4 nucleotide RNA internal loop from an R2 retrotransposon: Identification of a three purine-purine sheared pair motif and comparison to MC-SYM predictions.
Lerman, Y.V., Kennedy, S.D., Shankar, N., Parisien, M., Major, F., Turner, D.H.(2011) RNA 17: 1664-1677
- PubMed: 21778280 
- DOI: 10.1261/rna.2641911
- Primary Citation of Related Structures:  
2L8F - PubMed Abstract: 
The NMR solution structure is reported of a duplex, 5'GUGAAGCCCGU/3'UCACAGGAGGC, containing a 4 × 4 nucleotide internal loop from an R2 retrotransposon RNA. The loop contains three sheared purine-purine pairs and reveals a structural element found in other RNAs, which we refer to as the 3RRs motif ...