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. 2013 Jan 25;41(5):3373–3385. doi: 10.1093/nar/gkt023

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© The Author(s) 2013. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — (A) Predicted secondary structure of the ancestral 23S rRNA. Ancestral fragments of rRNA, indicated by black lines in the secondary structure, are derived from a consensus of models of rRNA evolution. The ancestral rRNA elements are stitched together by stem loops (blue). The RNA sequences are from the T. thermophilus 23S rRNA. Helix numbers are indicated. The predicted secondary structure of the a-rRNA alone is highlighted in the outbox. (B) 3D model of the a-PTC. This 3D model contains the a-rRNA plus five a-rPeptides (ancestral fragments of ribosomal proteins L2, L3, L4, L15 and L22). a-rRNA is shown in ribbon (brown), the stem loops are blue and the peptides are in surface representation (green). For reference, A-site (yellow) and P-site (red) substrates are shown in the figure, but are not components of the a-PTC. The modern LSU surface is shown for comparison (light gray, transparent).