Structure of the KsgA-RNA complex (Tu, Tropea, Austin, Court, Waugh and Ji. Structure 2009; 16:1417-1427. Abstract). (A) Surface electrostatic potential for the protein. Positively charged area is indicated in blue and negatively charged in red. RNA is shown as a tube-and-stick model. Residues K171 and K195 are highlighted with sphere representation in magenta. (B) Ribbon diagram of the cmplex viewed along the bound RNA. Shown as stick models are the amino acid or nucleotide residues involved in the two hydrogen bonds (dashed lines in black) between the protein and the RNA.