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. Author manuscript; available in PMC: 2014 Nov 24.
Published in final edited form as: Science. 2014 Sep 5;345(6201):1188–1191. doi: 10.1126/science.1255030

Figure 3. Contact between the downstream region of mRNA with the head of the 30S subunit.

Figure 3

(A) The entry to the downstream mRNA entry tunnel is surrounded by proteins uS3, uS4, and uS5. Positions +14 to +21 contact a positively charged patch on the surface of protein uS3 in the 30S head (Fig. S17). (B) Path of the downstream mRNA and (C) 90° rotated view. (D) Docking on the 30S body of the classical structure (17) (gray) shows that rotation of the head in the ap/ap intermediate structure translocates the mRNA by one codon. A-codon (yellow) and P-codon (red).