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- W1503160135 abstract "We propose that protein X provides the connection between damage to Escherichia coli DNA and inhibition of septation and cell division. This connection is needed to guarantee that each new bacterium receives a complete DNA copy. We present several new experiments here which demonstrate that the degree to which septation is inhibited following damage to DNA is correlated with the amount of protein X that is produced. Rifampin selectively blocks protein X production. This drug was shown to allow cells whose DNA had been damaged by nalidixic acid to resume septation. Several mutants formed septa-less filaments and also produced protein X at 42°C; rifampin both inhibited their production of protein X and permitted them to form septa and divide. Essentially complementary results were obtained with a dnaA mutant which at 42°C stopped making DNA, did not produce protein X, and continued to divide; added bleomycin degraded DNA, induced protein X, and inhibited septation. These results, as well as previous observations, are all consistent with the proposal that protein X is produced as a consequence of DNA damage and is an inhibitor of septation. We suggest that septation could require binding of a single-stranded region of DNA to a septum site in the membrane. Protein X could block this binding by combining with the DNA. This control could provide an emergency mechanism in addition to the usually proposed coordination in which completion of DNA synthesis creates a positive effector for a terminal step of septation. Or it could be the sole coordinating mechanism, even under unperturbed growth conditions." @default.
- W1503160135 created "2016-06-24" @default.
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- W1503160135 date "1978-03-01" @default.
- W1503160135 modified "2023-09-27" @default.
- W1503160135 title "Inhibition of <i>Escherichia coli</i> Division by Protein X" @default.
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- W1503160135 doi "https://doi.org/10.1128/jb.133.3.1492-1500.1978" @default.
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