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Guo S, Zahiri H, Stevens C, Spaanderman DC, Milroy LG, Ottmann C, Brunsveld L, Voets IK, Davies PL. Molecular basis for inhibition of adhesin-mediated bacterial-host interactions through a peptide-binding domain. Cell Rep 2021; 37:110002. [PMID: 34788627 DOI: 10.1016/j.celrep.2021.110002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 08/26/2021] [Accepted: 10/25/2021] [Indexed: 12/17/2022] Open
Abstract
Infections typically begin with pathogens adhering to host cells. For bacteria, this adhesion can occur through specific ligand-binding domains. We identify a 20-kDa peptide-binding domain (PBD) in a 1.5-MDa RTX adhesin of a Gram-negative marine bacterium that colonizes diatoms. The crystal structure of this Ca2+-dependent PBD suggests that it may bind the C termini of host cell-surface proteins. A systematic peptide library analysis reveals an optimal tripeptide sequence with 30-nM affinity for the PBD, and X-ray crystallography details its peptide-protein interactions. Binding of the PBD to the diatom partner of the bacteria can be inhibited or competed away by the peptide, providing a molecular basis for inhibiting bacterium-host interactions. We further show that this PBD is found in other bacteria, including human pathogens such as Vibrio cholerae and Aeromonas veronii. Here, we produce the PBD ortholog from A. veronii and demonstrate, using the same peptide inhibitor, how pathogens may be prevented from adhering to their hosts.
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Affiliation(s)
- Shuaiqi Guo
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada; Laboratory of Self-Organizing Soft Matter, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Laboratory of Chemical Biology, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Hossein Zahiri
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Corey Stevens
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Daniel C Spaanderman
- Laboratory of Chemical Biology, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Lech-Gustav Milroy
- Laboratory of Chemical Biology, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Christian Ottmann
- Laboratory of Chemical Biology, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Luc Brunsveld
- Laboratory of Chemical Biology, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Ilja K Voets
- Laboratory of Self-Organizing Soft Matter, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, the Netherlands
| | - Peter L Davies
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada.
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