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RapA, a Swi2/Snf2 protein that recycles RNA polymerase during transcription, may bind to and translocate on dsDNA (Shaw, Gan, Zhou, Zhi, Subburaman, Zhang, Joachimiak, Jin and Ji. Structure 2008; 16:1417-1427. Full Text). The RapAATPdsDNA model suggests a role of domain 2B in ATP-binding-associated advancement of dsDNA for Swi2/Snf2 protreins. 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.