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C-terminal domain of bacterial DnaA proteins. The DNA-binding C-terminal domain of DnaA contains a helix-turn-helix motif that specifically interacts with the DnaA box, a 9-mer motif that occurs repetitively in the replication origin oriC. Multiple copies of DnaA, which is an ATPase, bind to 9-mers at the origin and form an initial complex in which the DNA strands are being separated in an ATP-dependent step.
Jiyao W et al.(2023). "The conserved domain database in 2023.",