Chromosomal replication initiator protein DnaA

UniProtKB accession:  P03004

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UniProtKB description:  Plays an essential in the initiation and regulation of chromosomal replication. Binds in an ATP-dependent fashion to the origin of replication (oriC) to initiate formation of the DNA replication initiation complex once per cell cycle (PubMed:3036372). Binds the DnaA box (consensus sequence 5'-TTATC[CA]A[CA]A-3') and separates the double-stranded (ds)DNA (PubMed:3036372, PubMed:18216012). Forms a right-handed helical filament on oriC DNA; dsDNA binds to the exterior of the filament while single-stranded (ss)DNA is stabiized in the filament's interior (By similarity). The ATP-DnaA-oriC complex binds and stabilizes the upper strand of the AT-rich DNA unwinding element (DUE) (PubMed:18216012). Mutagenesis of residues that line the central pore blocks dsDNA strand separation (PubMed:18216012). Subsequent binding of DNA polymerase III subunits leads to replisome formation (PubMed:3036372, PubMed:18216012). The DnaA-ATP form converts to DnaA-ADP; once converted to ADP the protein cannot initiate replication, ensuring only 1 round of replication per cell cycle (PubMed:3036372). Binds ATP, ADP and dATP equally well, hydrolyzes ATP with a half-life of about 15 minutes, ATP hydrolysis is not required for pre-priming replisome formation, nucleotide exchange is very slow (PubMed:3036372). Binds acidic phospholipids (PubMed:26272946). DnaA inhibits its own gene expression (PubMed:2981626) as well as that of other genes including dam, rpoH (PubMed:2540187), ftsA and mioC.