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. 2009 Oct 7;97(7):1971–1983. doi: 10.1016/j.bpj.2009.03.069

Figure 4.

Figure 4

Development of interactions between polycation amine groups and DNA basepairs for the first three systems. (a–c) Interaction with DNA phosphorus atoms within 4 Å of any protonated amine.(a) PEI(20). (b) 50%-PEI(20). (c) PLL(20)). (d and e) Interactions between electronegative atoms in the major and minor grooves of DNA interacting with protonated amine. (d) (50%-PEI(20)). (e) PLL(20)). For d and e, only the DNA bases that are involved in an interaction at one point during the trajectory are shown.