Abstract
Escherichia coli cells require RNase E, encoded by the essential gene rne, to propagate. The growth properties on different carbon sources of E. coli cells undergoing suppression of RNase E production suggested that reduction in RNase E is associated with decreased expression of phosphoenolpyruvate synthetase (PpsA), which converts pyruvate to phosphoenolpyruvate during gluconeogenesis. Western blotting and genetic complementation confirmed the role of RNase E in PpsA expression. Adventitious ppsA overexpression from a multicopy plasmid was sufficient to restore colony formation of ∆rne E. coli on minimal media containing glycerol or succinate as the sole carbon source. Complementation of ∆rne by ppsA overproduction was observed during growth on solid media but was only partial, and bacteria showed slowed cell division and grew as filamentous chains. We found that restoration of colony-forming ability by ppsA complementation occurred independent of the presence of endogenous RNase G or second-site suppressors of RNase E essentiality. Our investigations demonstrate the role of phosphoryl transfer catalyzable by PpsA as a determinant of RNase E essentiality in E. coli.
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Acknowledgments
We thank Kei Kitahara for helpful suggestions on plasmid construction and Teppei Morita for critical review of the manuscript. We also thank Hisako Suzuki for her support. This study was supported by MHLW Grant 11050201 and AMED Grant 48650201 to AK and by Grant AI08619 to SNC.
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M. T., H. F., and A. K. designed research; M. T. and N. H. performed research. All authors analyzed data, and M. T. and S. N. C. wrote the article.
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Communicated by Djamel Drider.
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Tamura, M., Honda, N., Fujimoto, H. et al. PpsA-mediated alternative pathway to complement RNase E essentiality in Escherichia coli . Arch Microbiol 198, 409–421 (2016). https://doi.org/10.1007/s00203-016-1201-0
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DOI: https://doi.org/10.1007/s00203-016-1201-0