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Cardiolipin-Containing Lipid Membranes Attract the Bacterial Cell Division Protein DivIVA.

ABSTRACT: DivIVA is a protein initially identified as a spatial regulator of cell division in the model organism Bacillus subtilis, but its homologues are present in many other Gram-positive bacteria, including Clostridia species. Besides its role as topological regulator of the Min system during bacterial cell division, DivIVA is involved in chromosome segregation during sporulation, genetic competence, and cell wall synthesis. DivIVA localizes to regions of high membrane curvature, such as the cell poles and cell division site, where it recruits distinct binding partners. Previously, it was suggested that negative curvature sensing is the main mechanism by which DivIVA binds to these specific regions. Here, we show that Clostridioides difficile DivIVA binds preferably to membranes containing negatively charged phospholipids, especially cardiolipin. Strikingly, we observed that upon binding, DivIVA modifies the lipid distribution and induces changes to lipid bilayers containing cardiolipin. Our observations indicate that DivIVA might play a more complex and so far unknown active role during the formation of the cell division septal membrane.

SUBMITTER: Labajova N

PROVIDER: S-EPMC8348161 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Cytochrome c causes pore formation in cardiolipin-containing membranes.

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| S-EPMC3631622 | biostudies-literature

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| S-EPMC7654743 | biostudies-literature

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| S-EPMC9670838 | biostudies-literature

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| S-EPMC6689329 | biostudies-literature

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| S-EPMC10799373 | biostudies-literature

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| S-EPMC5869912 | biostudies-literature

Cardiolipin synthesis for the assembly of bacterial and mitochondrial membranes.

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| S-EPMC4339443 | biostudies-literature

Localisation of DivIVA by targeting to negatively curved membranes.

Project description:DivIVA is a conserved protein in Gram-positive bacteria and involved in various processes related to cell growth, cell division and spore formation. DivIVA is specifically targeted to cell division sites and cell poles. In Bacillus subtilis, DivIVA helps to localise other proteins, such as the conserved cell division inhibitor proteins, MinC/MinD, and the chromosome segregation protein, RacA. Little is known about the mechanism that localises DivIVA. Here we show that DivIVA binds to liposomes, and that the N terminus harbours the membrane targeting sequence. The purified protein can stimulate binding of RacA to membranes. In mutants with aberrant cell shapes, DivIVA accumulates where the cell membrane is most strongly curved. On the basis of electron microscopic studies and other data, we propose that this is due to molecular bridging of the curvature by DivIVA multimers. This model may explain why DivIVA localises at cell division sites. A Monte-Carlo simulation study showed that molecular bridging can be a general mechanism for binding of proteins to negatively curved membranes.

| S-EPMC2690451 | biostudies-literature

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