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Hypothetical model of RapA translocation on dsDNA. The RapAoATPodsDNA model, constructed on the basis of the crystal structure of RapA (PDB: 3DMQ), suggests a role of domain 2B in ATP-binding-associated advancement of dsDNA for Swi2/Snf2 proteins. In this view, the ATP molecule is not visible. The white arrow suggests the transporting direction of DNA; the black arrow suggests the translocation direction of the protein (Gary Shaw, Jianhua Gan, et al. Structure 16:1417-1427, 2008. PubMed: 18786404).