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In <jats:italic>Escherichia coli<\/jats:italic>, cell elongation requires crosslink cleavage by PG endopeptidases to make space for the incorporation of new PG material throughout the cell cylinder. Cell division, on the contrary, requires the localized synthesis and remodeling of new PG at midcell by the divisome. Little is known about the factors that modulate transitions between these two modes of PG biogenesis. In a transposon\u2010insertion sequencing screen to identify mutants synthetically lethal with a defect in the division protein FtsP, we discovered that mutants impaired for cell division are sensitive to elevated activity of the endopeptidases. Increased endopeptidase activity in these cells was shown to interfere with the assembly of mature divisomes, and conversely, inactivation of MepS was found to suppress the lethality of mutations in essential division genes. Overall, our results are consistent with a model in which the cell elongation and division systems are in competition with one another and that control of PG endopeptidase activity represents an important point of regulation influencing the transition from elongation to the division mode of PG biogenesis.<\/jats:p>","DOI":"10.1111\/mmi.14587","type":"journal-article","created":{"date-parts":[[2020,8,31]],"date-time":"2020-08-31T20:12:56Z","timestamp":1598904776000},"page":"966-978","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Cell division is antagonized by the activity of peptidoglycan endopeptidases that promote cell elongation"],"prefix":"10.1111","volume":"114","author":[{"given":"Thao T.","family":"Truong","sequence":"first","affiliation":[{"name":"Department of Microbiology Harvard Medical School  Boston MA 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