Cover.
Kink turn number 7 from the 23S rRNA as described in paper by Klein et al., [EMBO J. (2001) 20, 4214] is shown in blue. It is overlapped by dinucleotide consensus conformations number 9 (red) and 4 (yellow) reported by Schneider et al. in this issue [Nucleic Acids Res. (2004) 32, 1666–1677]. The consensus conformation 9 (red) overlaps tightly over the turn part of the motif, residues A95–A96. Both bases of the turn and conformation 9 are in `edge-on' orientation, the top one points back, the lower one in front. Consensus conformation 4 (yellow) can be superimposed over 23S nucleotides A80–G81 of the kink part of the motif but the overlap is less tight. A relatively small differences in ribose and base positions of the first residue, A80, cause a clash of the first base (yellow) with the first base of conformation 9 (red) and the experimental and consensus base of G81 pointing into the figure do not overlap well.
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