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Thompson CMA, Hall JPJ, Chandra G, Martins C, Saalbach G, Panturat S, Bird SM, Ford S, Little RH, Piazza A, Harrison E, Jackson RW, Brockhurst MA, Malone JG. Plasmids manipulate bacterial behaviour through translational regulatory crosstalk. PLoS Biol 2023; 21:e3001988. [PMID: 36787297 PMCID: PMC9928087 DOI: 10.1371/journal.pbio.3001988] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 01/04/2023] [Indexed: 02/15/2023] Open
Abstract
Beyond their role in horizontal gene transfer, conjugative plasmids commonly encode homologues of bacterial regulators. Known plasmid regulator homologues have highly targeted effects upon the transcription of specific bacterial traits. Here, we characterise a plasmid translational regulator, RsmQ, capable of taking global regulatory control in Pseudomonas fluorescens and causing a behavioural switch from motile to sessile lifestyle. RsmQ acts as a global regulator, controlling the host proteome through direct interaction with host mRNAs and interference with the host's translational regulatory network. This mRNA interference leads to large-scale proteomic changes in metabolic genes, key regulators, and genes involved in chemotaxis, thus controlling bacterial metabolism and motility. Moreover, comparative analyses found RsmQ to be encoded on a large number of divergent plasmids isolated from multiple bacterial host taxa, suggesting the widespread importance of RsmQ for manipulating bacterial behaviour across clinical, environmental, and agricultural niches. RsmQ is a widespread plasmid global translational regulator primarily evolved for host chromosomal control to manipulate bacterial behaviour and lifestyle.
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Affiliation(s)
- Catriona M. A. Thompson
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk, United Kingdom
| | - James P. J. Hall
- Department of Evolution, Ecology and Behaviour Institute of Infection, Veterinary and Ecological Sciences University of Liverpool, Crown Street, Liverpool, United Kingdom
| | - Govind Chandra
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Carlo Martins
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Gerhard Saalbach
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Supakan Panturat
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Susannah M. Bird
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Samuel Ford
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Richard H. Little
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Ainelen Piazza
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
| | - Ellie Harrison
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Robert W. Jackson
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Michael A. Brockhurst
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
- Division of Evolution and Genomic Sciences, School of Biological Sciences, University of Manchester, Manchester, United Kingdom
| | - Jacob G. Malone
- Department of Molecular Microbiology, John Innes Centre, Colney Lane, Norwich, United Kingdom
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk, United Kingdom
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Patent highlights October-November 2019. Pharm Pat Anal 2020; 9:33-40. [PMID: 32301373 DOI: 10.4155/ppa-2020-0003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A snapshot of noteworthy recent developments in the patent literature of relevance to pharmaceutical and medical research and development.
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Ironing out pyoverdine's chromophore structure: serendipity or design? J Biol Inorg Chem 2019; 24:659-673. [PMID: 31214860 DOI: 10.1007/s00775-019-01678-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 06/07/2019] [Indexed: 10/26/2022]
Abstract
Pyoverdines are Pseudomonas aeruginosa's primary siderophores. These molecules, composed of a fluorescent chromophore attached to a peptide chain of 6-14 amino acids, are synthesized by the bacterium to scavenge iron (essential to its survival and growth) from its environment. Hijacking the siderophore pathway to use pyoverdine-antibiotic compounds in a Trojan horse approach has shown promise but remains very challenging because of the synthetic efforts involved. Indeed, both possible approaches (grafting an antibiotic on pyoverdine harvested from Pseudomonas or designing a total synthesis route) are costly, time-consuming and low-yield tasks. Designing comparatively simple analogs featuring the salient properties of the original siderophore is thus crucial for the conception of novel antibiotics to fight bacterial resistance. In this work, we focus on the replacement of the pyoverdine chromophore, a major roadblock on the synthetic pathway. We propose three simpler analogs and evaluate their ability to complex iron and interact with the FpvA transporter using molecular modeling techniques. Based on these results, we discuss the role of the native chromophore's main features (polycyclicity, positive charge, flexibility) on pyoverdine's ability to bind iron and be recognized by membrane transporter FpvA and propose guidelines for the design of effective synthetic siderophores.
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Bouvier B, Cézard C. Impact of iron coordination isomerism on pyoverdine recognition by the FpvA membrane transporter of Pseudomonas aeruginosa. Phys Chem Chem Phys 2017; 19:29498-29507. [PMID: 29082401 DOI: 10.1039/c7cp04529h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Pyoverdines, the primary siderophores of Pseudomonas bacteria, scavenge the iron essential to bacterial life in the outside medium and transport it back into the periplasm. Despite their relative simplicity, pyoverdines feature remarkably flexible recognition characteristics whose origins at the atomistic level remain only partially understood: the ability to bind other metals than ferric iron, the capacity of outer membrane transporters to recognize and internalize noncognate pyoverdines from other pseudomonads… One of the less examined factors behind this polymorphic recognition lies in the ability for pyoverdines to bind iron with two distinct chiralities, at the cost of a conformational switch. Herein, we use free energy simulations to study how the stereochemistry of the iron chelating groups influences the structure and dynamics of two common pyoverdines and impacts their recognition by the FpvA membrane transporter of P. aeruginosa. We show that conformational preferences for one metal binding chirality over the other, observed in solution depending on the nature of the pyoverdine, are canceled out by the FpvA transporter, which recognizes both chiralities equally well for both pyoverdines under study. However, FpvA discriminates between pyoverdines by altering the kinetics of stereoisomer interconversion. We present structural causes of this intriguing recognition mechanism and discuss its possible significance in the context of the competitive scavenging of iron.
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Affiliation(s)
- Benjamin Bouvier
- Laboratoire de Glycochimie, des Antimicrobiens et des Agroressources, CNRS UMR7378/Université de Picardie Jules Verne, 10 rue Baudelocque, 80039 Amiens Cedex, France.
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Synthesis, iron(III) complexation properties, molecular dynamics simulations and P. aeruginosa siderophore-like activity of two pyoverdine analogs. Eur J Med Chem 2017; 137:338-350. [DOI: 10.1016/j.ejmech.2017.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/02/2017] [Accepted: 06/05/2017] [Indexed: 11/23/2022]
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