Secondary Structures of rRNAs from All Three Domains of Life
Figure 3
The 2° structure of the 16S rRNA of E. coli, based on three-dimensional structures.
Regions where base-pairing interactions were modified relative to the co-variation 2° structure are highlighted in red. The inset shows the 2° and three-dimensional structures of the central pseudoknot (nucleotides 9–25 and 913–920). Nucleotides 9-13 are blue, nucleotides 14–19 are red, nucleotides 20–25 are green and nucleotides 913–920 are orange. The topology of the A915-U15-U20 triple is difficult to represent clearly in the 2° structure: A915 is base-paired with U15, which is base paired with U20 to form a base triple. This representation includes the sequence of the 16S rRNA and the helix and domain numbers.