Skip to main content
. 2005 Sep;69(3):501–526. doi: 10.1128/MMBR.69.3.501-526.2005

FIG. 15.

FIG. 15.

A simple two-step model of Tus-Ter and DnaB interactions. (Left) DnaB approaching the permissive face of the Tus-Ter complex promotes the formation of the open, nonspecifically bound form of Tus, which may dissociate directly or slide along the DNA. If DnaB moves into the Ter site before Tus can return to the specifically bound closed form, then helicase activity continues. (Right) DnaB approaching from the nonpermissive face cannot promote the formation of the open form of the complex, and further DNA unwinding is blocked.