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A Tad-like apparatus is required for contact-dependent prey killing in predatory social bacteria

By Sofiene Seef, Julien Herrou, Paul de Boissier, Laetitia My, Gael Brasseur, Donovan Robert, Rikesh Jain, Romain Mercier, Eric Cascales, Bianca H Habermann, Tâm Mignot

Posted 27 Feb 2021
bioRxiv DOI: 10.1101/2021.02.25.432843

Myxococcus xanthus, a soil bacterium, predates collectively using motility to invade prey colonies. Prey lysis is mostly thought to rely on secreted factors, cocktails of antibiotics and enzymes, and direct contac with Myxococcus cells. In this study, we show that on surfaces the coupling of A-motility and contact-dependent killing is the central predatory mechanism driving effective prey colony invasion and consumption. At the molecular level, contact-dependent killing involves a newly discovered type IV filament-like machinery (Kil) that both promotes motility arrest and prey cell plasmolysis. In this process, Kil proteins assemble at the predator-prey contact site, suggesting that they allow tight contact with prey cells for their intoxication. Kil-like systems form a new class of Tad-like machineries in predatory bacteria, suggesting a conserved function in predator-prey interactions. This study further reveals a novel cell-cell interaction function for bacterial pili-like assemblages.

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