Crystal Structure of the Catalytic α Subunit of E. coli Replicative DNA Polymerase III
2006; Cell Press; Volume: 126; Issue: 5 Linguagem: Inglês
10.1016/j.cell.2006.07.028
ISSN1097-4172
AutoresMeindert H. Lamers, Roxana E. Georgescu, Sang-Gyu Lee, Mike O’Donnell, John Kuriyan,
Tópico(s)Antibiotic Resistance in Bacteria
ResumoBacterial replicative DNA polymerases such as Polymerase III (Pol III) share no sequence similarity with other polymerases. The crystal structure, determined at 2.3 Å resolution, of a large fragment of Pol III (residues 1–917), reveals a unique chain fold with localized similarity in the catalytic domain to DNA polymerase β and related nucleotidyltransferases. The structure of Pol III is strikingly different from those of members of the canonical DNA polymerase families, which include eukaryotic replicative polymerases, suggesting that the DNA replication machinery in bacteria arose independently. A structural element near the active site in Pol III that is not present in nucleotidyltransferases but which resembles an element at the active sites of some canonical DNA polymerases suggests that, at a more distant level, all DNA polymerases may share a common ancestor. The structure also suggests a model for interaction of Pol III with the sliding clamp and DNA.
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