Structure of a RecA-ssDNA-ADP-AlF
--Mg2+ presynaptic nucleoprotein filament. Shown are ribbon diagrams of side (A) and top (B) views of the recently reported 3CMU crystal structure . The NTDs and ssDNA are shown in yellow and red, respectively. The side chains of three charged residues are depicted as a ball-and-stick model. (C) Surface charge potential of the 3CMU RecA-ssDNA-ADP-AlF4--Mg2+ presynaptic nucleoprotein filament. The positively and negatively charged regions are indicated in blue and red, respectively. The positions of Lys8 , Lys19 , and Lys23  are indicated.