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Robust peptidoglycan growth by dynamic and variable multi-protein complexes

Journal

CURRENT OPINION IN MICROBIOLOGY
Volume 36, Issue -, Pages 55-61

Publisher

CURRENT BIOLOGY LTD
DOI: 10.1016/j.mib.2017.01.006

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Funding

  1. Wellcome Trust [101824/Z/13/Z]
  2. MRC [MR/N002679/1]
  3. European Commission [FP7-PEOPLE-2013-IEF-623868]
  4. Medical Research Council [MR/N002679/1] Funding Source: researchfish
  5. MRC [MR/N002679/1] Funding Source: UKRI

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In Gram-negative bacteria such as Escherichia coli the peptidoglycan sacculus resides in the periplasm, a compartment that experiences changes in pH value, osmolality, ion strength and other parameters depending on the cell's environment. Hence, the cell needs robust peptidoglycan growth mechanisms to grow and divide under different conditions. Here we propose a model according to which the cell achieves robust peptidoglycan growth by employing dynamic multi-protein complexes, which assemble with variable composition from freely diffusing sets of peptidoglycan synthases, hydrolases and their regulators, whereby the composition of the active complexes depends on the cell cycle state - cell elongation or division - and the periplasmic growth conditions.

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