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. 2021 May 28;49(10):5881–5890. doi: 10.1093/nar/gkab302

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© The Author(s) 2021. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Detailed conformations of cytosines in the tetrameric G-quadruplex formed by d(G4C2)₂-Ba (C222₁). The conformation of propeller loop, C5 and C6, in the dimeric G-quadruplex of (A) Form-1/7 formed by chains A/B, (B) Form-1/1 formed by chains C/D and (C) Form-1/1 formed by chains E/F. The conformation of the C11 and C12 bases of (D) chain A (green) and chain F (yellow), (E) chain B (yellow) and chain D (green) and (F) chain C (yellow) and chain E (green) located at the 3′- end observed in the unit cell. The hydrogen bonds are represented by read dash and solid black lines.