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. 1999 Sep 14;96(19):10614–10619. doi: 10.1073/pnas.96.19.10614

Figure 1.

Figure 1

Working design for nucleobase motifs leading to expanded DNA molecularities. (a, from left to right) Schematic representation of a circularly modular quartet motif with ideal sector angle of 90°, ab initio optimized geometry of a G-quartet motif, and actual 90° sector angle for G defined by the intersection of vectors along the van der Waals donor-donor and acceptor-acceptor atom surfaces using the geometry from its optimized quartet. (b, from left to right) Schematic representation of a circularly modular quintet motif with ideal sector angle of 72°, ab initio optimized geometry of an iG-quintet motif, and actual 67° sector angle for iG defined by the intersection of vectors along the van der Waals donor-donor and acceptor-acceptor atom surfaces using the geometry from its optimized quintet. (c) Schematic representation of a circularly modular n-mer motif with ideal sector angle of 360°/n.