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Purified Stx and λ phage initiator O proteins bind specifically to two different origins of replication in vitro.

The O protein is a crucial factor initiating the DNA replication of lambdoid bacteriophage. Efficient DNA replication of Shiga toxin-converting phage is necessary for effective production of Shiga toxin - main virulence factor of STEC strains. We developed an improved protocol for overproduction, bacterial cell lysis and purification of λO protein. With use of this method we have also isolated O proteins of Stx-phage P27 and 933W that were never purified before. Purified proteins were tested for their DNA binding activity and revealed a sequence specific interactions.

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