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. 2017 May 5;13(6):2458–2480. doi: 10.1021/acs.jctc.7b00226

Figure 1.

Figure 1

Propeller loop conformations in the experimental structures of Htel topologies (model 1 is shown for the NMR structures). The GQs are shown in cartoon, while the propeller loop nucleosides are shown in sticks. In the TTA propeller loop, PT1, PT2, and PA3 (see abbreviations in Methods) are colored in green, yellow, and blue, respectively. In GQs where the PA3 formed alignment with the flanking base, the flanking base is shown in red sticks. The PDBs of the structures are (a) 1KF1, (b) IK8P, (c) 2HY9, (d) 2JSM, (e) 2GKU, (f) 2JPZ, (g) 2JSL, and (h) 2MBJ. The a-b, c-e, f-g, and h show various parallel-stranded, hybrid-1, hybrid-2, and antiparallel (2+2) GQs, respectively. The propeller loops and 5′ and 3′ ends of GQs are labeled in the figure. Chains 1 and 2 are also labeled in bimolecular parallel-stranded GQ.