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. 2015 Sep 30;5(4):2435–2463. doi: 10.3390/biom5042435

Figure 7.

Figure 7

Polyelectrolyte effect of DNA. (a) Condensation of counterions around DNA and their release upon protein–DNA complex formation. Red circles represent the phosphate anions of DNA. Cyan circles represent the cations condensed around DNA. Blue circles on the protein represent the positively charged groups that form ion pairs with DNA. (b) Computed probability density maps of K+ (red) and Na+ (green) ions around B-form DNA at 0.1 M ionic strength. Panel b was adapted from Howard et al. [61] with permission from American Chemical Society.