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. 2003 Jun;84(6):3564–3582. doi: 10.1016/S0006-3495(03)75089-9

FIGURE 2.

FIGURE 2

Structures of corresponding non-Watson-Crick basepairs in the bacterial Loop E and in spinach chloroplast Loop E. The bacterial basepairs (left) are taken from the high-resolution crystal structure (NDB file URL064) whereas the corresponding chloroplast basepairs are shown as initially modeled based on isosteric considerations (Leontis and Westhof, 1998b). (Top) Cis bifurcated G/U and A/C. Middle two rows: Water-inserted cis Watson-Crick G/A followed by cis bifurcated G/G and A/A. (Bottom) trans Hoogsteen/Sugar-edge (sheared) G/A and A/A.