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. 2011 Mar 4;39(12):5264–5275. doi: 10.1093/nar/gkr114

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© The Author(s) 2011. 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/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 5. — Tertiary-structure model of rpS25 (comprising residues 42–108) together with yeast 80S•CrPV map at 6.7Å resolution (M. Muhs and C. M. T. Spahn, unpublished). (a) Perspective from the intersubunit space. (b) The C-terminus shows possible interactions of rpS25 with helix 41 (h41) of the 18S rRNA. It is flanked by rpS5. H2 is cut by the clipping plane and is not visible here. (c) The two helices H1 and H3 form the core of a HTH motif. The highly conserved residues Arg58 and Arg68 fit into two well-defined density regions bridging rpS25 to the stem loop SL2.3 of the CrPV IRES. (d) At lower thresholds, the cryo-EM density map indicates further interactions between the CrPV IRES and the ribosome (black arrows). The N-terminus (N) is truncated, because it could not be modelled based on our template structure.