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Figure 3 | BMC Structural Biology

Figure 3

From: Hydrogen bonding and packing density are factors most strongly connected to limiting sites of high flexibility in the 16S rRNA in the 30S ribosome

Figure 3

Internucleotide geometrical parameters. Distance and geometry measurements for a nucleotide pair are illustrated on 16S rRNA nucleotides U244 and G894 which form a UV-induced photocrosslink. The distances between reactive bonds (double bonds at C5/C6 and N7/C8 in this instance), and C1'-C1' are indicated. The angle between respective base planes, here called base plane angle, is calculated as the angle between the perpendicular vectors (n1 and n2) to the planes defined by the C2, C4 and C6 atoms of the pyrimidine or purine. The angle, here called the reactive bond angle, is between the vectors defined by the C5/C6 atoms of the pyrimidine and the N7/C8 atoms of the purine.

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