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. 2010 Jan 28;49(8):1596–1605. doi: 10.1021/bi9019912

Figure 1.

Figure 1

X-ray crystal structure of the guanine-bound xpt guanine riboswitch aptamer domain (10), marked with dye positions for the variants used in this FRET study. Guanine is colored dark pink. The green (Cy3) and red (Cy5) spheres mark dye locations on the variant designed for probing dynamics between the P1 and P2 helices (P1−P2 variant). Similarly, yellow (Cy3) and light pink (Cy5) spheres mark dye locations on the P1−P3 variant, and green (Cy3) and yellow (Cy5) spheres mark dye locations on the P2−P3 variant. Nucleotide color scheme (same as in ref (10)): J1/3 (joining region connecting P1 and P3), yellow; J2/3, green; J1/2, blue; L2 (loop capping P2), purple; L3, orange.