We know that Beta clamp in bacteria has two subunits and takes the shape of a ring

Yes, that's correct. The beta clamp in bacteria is a multimeric protein complex composed of two identical subunits arranged in the shape of a ring. This ring-shaped structure plays a crucial role in DNA replication by tethering DNA polymerase III to the DNA template during the replication process.

The beta clamp functions as a sliding clamp that encircles the DNA double helix, providing a stable platform for the DNA polymerase III holoenzyme to maintain processivity during DNA synthesis. This allows the polymerase to remain associated with the DNA template and synthesize long stretches of DNA without dissociating from the template strand.

The ring-shaped structure of the beta clamp enables it to slide along the DNA double helix, moving ahead of the DNA polymerase as it synthesizes new DNA strands. This sliding motion helps coordinate the actions of multiple enzymes involved in DNA replication and ensures efficient and accurate copying of the genetic material.

Overall, the beta clamp plays a critical role in DNA replication in bacteria by facilitating the processivity of DNA polymerase III and ensuring the faithful duplication of the genome during cell division.