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Tyson J, Radford P, Lambert C, Till R, Huwiler SG, Lovering AL, Elizabeth Sockett R. Prey killing without invasion by Bdellovibrio bacteriovorus defective for a MIDAS-family adhesin. Nat Commun 2024; 15:3078. [PMID: 38594280 PMCID: PMC11003981 DOI: 10.1038/s41467-024-47412-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 03/27/2024] [Indexed: 04/11/2024] Open
Abstract
The bacterium Bdellovibrio bacteriovorus is a predator of other Gram-negative bacteria. The predator invades the prey's periplasm and modifies the prey's cell wall, forming a rounded killed prey, or bdelloplast, containing a live B. bacteriovorus. Redundancy in adhesive processes makes invasive mutants rare. Here, we identify a MIDAS adhesin family protein, Bd0875, that is expressed at the predator-prey invasive junction and is important for successful invasion of prey. A mutant strain lacking bd0875 is still able to form round, dead bdelloplasts; however, 10% of the bdelloplasts do not contain B. bacteriovorus, indicative of an invasion defect. Bd0875 activity requires the conserved MIDAS motif, which is linked to catch-and-release activity of MIDAS proteins in other organisms. A proteomic analysis shows that the uninvaded bdelloplasts contain B. bacteriovorus proteins, which are likely secreted into the prey by the Δbd0875 predator during an abortive invasion period. Thus, secretion of proteins into the prey seems to be sufficient for prey killing, even in the absence of a live predator inside the prey periplasm.
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Affiliation(s)
- Jess Tyson
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
- Chain Biotechnology Ltd, MediCity, D6 Thane Road, Nottingham, NG90 6BH, UK
| | - Paul Radford
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
| | - Carey Lambert
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
- Biodiscovery Institute, University of Nottingham, Coates Road, Nottingham, NG7 2RD, UK
| | - Rob Till
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
- Biodiscovery Institute, University of Nottingham, Coates Road, Nottingham, NG7 2RD, UK
| | - Simona G Huwiler
- Department of Plant & Microbial Biology, University of Zurich, CH-, 8057, Zurich, Switzerland
| | - Andrew L Lovering
- School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK.
| | - R Elizabeth Sockett
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK.
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