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. Author manuscript; available in PMC: 2014 Jul 3.
Published in final edited form as: J Am Chem Soc. 2013 Jun 19;135(26):9785–9796. doi: 10.1021/ja402525c

Figure 2.

Figure 2

Two orientations of the glycosidic torsion angle χ: anti (left) and syn (center and right). χ torsion angle is defined as O4′-C1′-N9-C4 and O4′-C1′-N1-C2 for purines and pyrimidines, respectively. The O5′H…N3(G) hydrogen bond typical for 5′-terminal syn guanosines in the G-DNA is depicted right.34