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Crystal structure of PriB, a component of the Escherichia coli replication restart primosome. | LitMetric
Maintenance of genome stability following DNA damage requires origin-independent reinitiation of DNA replication at repaired replication forks. In E. coli, PriA, PriB, PriC, and DnaT play critical roles in recognizing repaired replication forks and reloading the replisome onto the template to reinitiate DNA replication. Here, we report the 2.0 A resolution crystal structure of E. coli PriB, revealing a dimer that consists of a single structural domain formed by two oligonucleotide/oligosaccharide binding (OB) folds. Structural similarity of PriB to single-stranded DNA binding proteins reveals insights into its mechanisms of DNA binding. The structure further establishes a putative protein interaction surface that may contribute to the role of PriB in primosome assembly by facilitating interactions with PriA and DnaT. This is the first high-resolution structure of a protein involved in oriC-independent replisome loading and provides unique insight into mechanisms of replication restart in E. coli.
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