Bacterial Division Proteins FtsZ and ZipA Induce Vesicle Shrinkage and Cell Membrane Invagination |
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Authors: | Elisa J Cabré Alicia Sánchez-Gorostiaga Paolo Carrara Noelia Ropero Mercedes Casanova Pilar Palacios Pasquale Stano Mercedes Jiménez Germán Rivas Miguel Vicente |
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Institution: | From the ‡Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas (CIB-CSIC), 28040 Madrid, Spain.;the §Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), 28049 Madrid, Spain, and ;the ¶Dipartimento di Biologia, Universitá degli Studi di Roma Tre, 00146 Roma, Italy |
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Abstract: | Permeable vesicles containing the proto-ring anchoring ZipA protein shrink when FtsZ, the main cell division protein, polymerizes in the presence of GTP. Shrinkage, resembling the constriction of the cytoplasmic membrane, occurs at ZipA densities higher than those found in the cell and is modulated by the dynamics of the FtsZ polymer. In vivo, an excess of ZipA generates multilayered membrane inclusions within the cytoplasm and causes the loss of the membrane function as a permeability barrier. Overproduction of ZipA at levels that block septation is accompanied by the displacement of FtsZ and two additional division proteins, FtsA and FtsN, from potential septation sites to clusters that colocalize with ZipA near the membrane. The results show that elementary constriction events mediated by defined elements involved in cell division can be evidenced both in bacteria and in vesicles. |
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Keywords: | Cell Division Escherichia coli Membrane Function Protein-Protein Interactions Synthetic Biology FtsZ ZipA Bacterial Membrane Giant Vesicles |
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