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. 2018 Dec;24(12):1667–1676. doi: 10.1261/rna.067660.118

FIGURE 4.

FIGURE 4.

Temperature dependence of C1397 conformational dynamics. (A) In the decoding region of the ambient-temperature mRNA model, C1397 engages in H-bonding with U4 which demarcates the boundary between the A-site mRNA codon and codon-1. A final unbiased Fo-Fc simple omit ambient temperature electron-density map of mRNA and C1397 contoured at the 3σ level is shown in blue and at 3 Å. (B) Superposition of the ambient temperature 30S-decoding complex with cryogenic structure shows disorder in the cryogenic mRNA structure as well as the alternate conformation of C1397. (C) Superposition of our ambient temperature structure (salmon) and the identical cryo temperature structure obtained by another laboratory (slate; PDB ID: 1IBL) showing the disorder in the cryogenic structure. (D) Superposition of our ambient temperature structure (salmon) with the two cryo-cooled structures (cyan and slate).