Skip to main content
. 2012 Jul 23;7(7):e41704. doi: 10.1371/journal.pone.0041704

Figure 2. BI and BII phosphate groups.

Figure 2

. The two panels represent two views of the same 5′-CpApG-3′ fragment and highlight the structural differences between BI (p in GpA, circled in blue in the left panel) and BII (p in CpA, circled in red in the right panel) phosphate groups. The orientation of the O1P-O2P vector is roughly perpendicular and parallel to the axis of the double helix in BI and BII, respectively. The O3′ atom points outside the helix in BI whereas it is turned towards the helix center in BII.