Two Essential DNA Polymerases at the Bacterial Replication Fork

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Science  23 Nov 2001:
Vol. 294, Issue 5547, pp. 1716-1719
DOI: 10.1126/science.1066351

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DNA replication in bacteria is carried out by a multiprotein complex, which is thought to contain only one essential DNA polymerase, specified by the dnaE gene inEscherichia coli and the polC gene inBacillus subtilis. Bacillus subtilis genome analysis has revealed another DNA polymerase gene,dnaEBS , which is homologous to dnaE. We show that, in B. subtilis, dnaEBS is essential for cell viability and for the elongation step of DNA replication, as is polC, and we conclude that there are two different essential DNA polymerases at the replication fork of B. subtilis, as was previously observed in eukaryotes.dnaEBS appears to be involved in the synthesis of the lagging DNA strand and to be associated with the replication factory, which suggests that two different polymerases carry out synthesis of the two DNA strands in B. subtilis and in many other bacteria that contain both polC and dnaEgenes.

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