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Figure 7.
Figure 7. Comparison of the
GCAA and GAGA loops, illustrates
small differences in hydrogen bond-
ing patterns. The hydrogen bonding
between -G5 2'OH and the third
base of the loops are shown. No
hydrogen atoms are displayed ex-
cept the G5 2'OH and the protons of
the third base, which are shown in
dark circles. (a) In the GCAA loop
the 2' hydroxyl group of G5 can
interact with the N7 of A7 and the
amino group of A7. (b) In the
GAGA loop the 2' hydroxyl group
of G5 can interact with the N7 of G7
or with the O6 of G7.
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