The Ter sites specifically interact with the replication terminator protein called Tus, which is a polar contra-helicase, that is, it impedes the DNA unwinding activity of DnaB in an orientation-dependent manner.
The Ter sites specifically interact with the replication terminator protein. This replication terminator protein is called Tus. Tus is a polar contra-helicase-dependent manner. Helicase is. It impedes the DNA unwinding activity of DnaB in an orientation.