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. 2017 Mar 19;372(1716):20160182. doi: 10.1098/rstb.2016.0182

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Coupling between Sec-tRNA^Sec repositioning, docking of SelB on the SRL and GTPase activation (modified from [13]). (a) Sequential docking of SelB-Sec-tRNA^Sec on the SRL. Movements of the anticodon (shown by distance denoted as R_ASL) and elbow (R_elb distance) of tRNA^Sec and of SelB His61 (R_His61 distance) are indicated. Ribosome elements interacting with tRNA^Sec are shown in mauve, with SelB in pink; sh, 30S shoulder (G357 to U368 of 16S rRNA); S12, protein S12; DC, decoding centre; H43 and H89, helices of 23S rRNA; L11, protein L11. (b) Distance changes from state to state; R_ASL (N3 of C35 in tRNA^Sec to N1 of G in UGA); R_elb (tRNA^Sec elbow, C5′ of Ψ55 in tRNA^Sec to O2′ of A2473 in H89); R_His61 (ND1 of His61 in SelB to O2′ of G2661 in SRL).