A possible tertiary rRNA interaction between expansion segments ES3 and ES6 in eukaryotic 40S ribosomal subunits

Secondary structure model of 18S rRNA (Gutell 1993) showing the position of expansion sequences ES3 (red) and ES6 (blue) (Gerbi 1996). The sequences of the proposed complementary regions in ES3 and ES6 are shown for wheat Triticum aestivum and mouse Mus musculus, GenBank accession nos. AY049040 and X00686, respectively. (Inset) Position of ES3 (red) and ES6 (blue) in the 40S ribosomal subunit (Spahn et al. 2001). The 40S subunit is shown from the inter-subunit side (left) and from the solvent side (right).