PMID:2452153
| Citation |
Polayes, DA, Rice, PW and Dahlberg, JE (1988) DNA polymerase I activity in Escherichia coli is influenced by spot 42 RNA. J. Bacteriol. 170:2083-8 |
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| Abstract |
We have shown that the level of DNA polymerase I (Pol I) activity in Escherichia coli is influenced by the level of a 109-nucleotide RNA, spot 42 RNA. Deletion of the gene for spot 42 RNA results in a 20 to 25% decrease in Pol I activity, as assayed by nucleotide incorporation in cell extracts and a decrease in the ability of cells to grow in the presence of the DNA-alkylating agent methyl methanesulfonate. Also, a physiological reduction of the level of spot 42 RNA, by growth in media containing poor carbon sources, results in a corresponding decrease in Pol I activity. Conversely, overproduction of spot 42 RNA results in a 10 to 15% increase in Pol I activity in vitro. Thus, changes in the amount of spot 42 RNA result in relatively small but significant changes in Pol I activity. |
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| Keywords |
Chromosome Deletion; Culture Media; DNA Polymerase I/genetics; DNA Polymerase I/metabolism; Escherichia coli/enzymology; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli/metabolism; Genes, Bacterial; Methyl Methanesulfonate/metabolism; Plasmids; RNA, Bacterial/biosynthesis; RNA, Bacterial/genetics; Transcription, Genetic; Transformation, Bacterial |
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