Hydrolysis of the IciA protein, an inhibitor of DNA replication initiation, by protease Do in Escherichia coli

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Abstract

The 33 kDa IciA protein, an inhibitor of replication initiation of the Escherichia coli chromosome, was found to be specifically cleaved to 27 kDa fragment by protease Do, the htrA gene product. The 27 kDa polypeptide could no longer interact with the oriC region, and therefore the cleavage-site is likely to reside within the N-terminal DNA-binding domain of the IciA protein. In addition, protease Do was found to localize primarily to the cytoplasm although it also could bind to membranes through an ionic interaction. These results suggest that intracellular breakdown of the IciA protein by protease Do may provide a potential mechanism involving the regulation of initiation of DNA replication in Escherichia coli. © 1993.

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Yoo, S. J., Seol, J. H., Woo, S. K., Suh, S. W., Hwang, D. S., Ha, D. B., & Chung, C. H. (1993). Hydrolysis of the IciA protein, an inhibitor of DNA replication initiation, by protease Do in Escherichia coli. FEBS Letters, 327(1), 17–20. https://doi.org/10.1016/0014-5793(93)81029-Y

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