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Figure 3
(a) Model of the transition state where the arrow represents the eigenvector of the imaginary frequency ([\nu_{\rm im}] = 1084.1 i cm−3) indicating the transfer of H from the amine N to O3 [the atom labeled `O' in (a)] of the P-site ribose sugar. The O2 hydroxyl group of the P-site tRNA (O24—H43) forms a stable hydrogen bond to the ester carbonyl group of the tRNA at the A-site (O4) (dashed line). (b) Molecular graph of the transition state: the large dark spheres are located at the nuclear critical points of C atoms, the large red sphere those of the O nuclei, the blue spheres are N nuclei, and the large light-gray spheres indicate the position of the H nuclear critical points. The lines of maximum electron density linking the nuclei are the bond paths and the small red dots are the BCPs. The yellow dots are the ring critical points. BL indicates bond length.

IUCrJ
Volume 1| Part 6| September 2014| Pages 457-469
ISSN: 2052-2525
doi:10.1107/S2052252514018867