Overproduction of DnaE protein (alpha subunit of DNA polymerase III) restores viability in a conditionally inviable Escherichia coli strain deficient in DNA polymerase I.
A polA12 recA718 double mutant of Escherichia coli, in which DNA polymerase I is temperature sensitive, was unable to maintain normal DNA synthesis or to form colonies on rich media at 42 degrees C. Overproduction of DnaE protein, the polymerizing alpha subunit of DNA polymerase III, restored bacterial DNA replication and cell viability, as well as the PolI-dependent replication of the plasmid carrying dnaE.
Witkin
E M
EM
Waksman Institute, Rutgers State University of New Jersey, Piscataway, New Jersey 08854.
Roegner-Maniscalco
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D004256:DNA Polymerase I / Q000235:genetics / Q000378:metabolism*; D004258:DNA Polymerase III / Q000096:biosynthesis* / Q000235:genetics; D004261:DNA Replication / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D009154:Mutation / Q000235:genetics; D010957:Plasmids / Q000235:genetics; D011938:Rec A Recombinases / Q000235:genetics; D013696:Temperature
D004269:DNA, Bacterial; C074904:DNA polymerase III, alpha subunit; D011938:Rec A Recombinases; D004256:DNA Polymerase I; D004258:DNA Polymerase III