J. Biol. Chem., Vol. 263, Issue 6, 2719-2723, 02, 1988
Functionality of the dnaA protein binding site in DNA replication is orientation-dependent
W Seufert, B Dobrinski, R Lurz and W Messer
Max-Planck-Institut fur Molekulare Genetik, Berlin, West Germany.
We analyzed the functionality of different dnaA protein binding sites by
assaying in vitro dnaA-dependent replication of pBR322 derivatives. Single
dnaA sites from oriC and from the mioC and dnaA gene promoters were active
when combined with the primer generating element of pBR322 in a proper
distance. Prereplisome assembly did not require sequences in addition to
the 9-base pair consensus dnaA binding site. Inversion of the structurally
asymmetric dnaA site relative to its orientation in wild type pBR322
resulted in a marked reduction in replication efficiency, as observed with
five different dnaA sites studied. The direction of DNA replication was not
affected.