Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>

ABSTRACT Disulfide bond formation is required for the folding of many bacterial virulence factors. However, whereas the Escherichia coli disulfide bond-forming system is well characterized, not much is known on the pathways that oxidatively fold proteins in pathogenic bacteria. Here, we report the d...

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Autores principales: Isabelle S. Arts, Geneviève Ball, Pauline Leverrier, Steven Garvis, Valérie Nicolaes, Didier Vertommen, Bérengère Ize, Veronica Tamu Dufe, Joris Messens, Romé Voulhoux, Jean-François Collet
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Publicado: American Society for Microbiology 2013
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spelling oai:doaj.org-article:ce7eb50e935a4fe1a8372d8e3636f5f92021-11-15T15:42:31ZDissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>10.1128/mBio.00912-132150-7511https://doaj.org/article/ce7eb50e935a4fe1a8372d8e3636f5f92013-12-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00912-13https://doaj.org/toc/2150-7511ABSTRACT Disulfide bond formation is required for the folding of many bacterial virulence factors. However, whereas the Escherichia coli disulfide bond-forming system is well characterized, not much is known on the pathways that oxidatively fold proteins in pathogenic bacteria. Here, we report the detailed unraveling of the pathway that introduces disulfide bonds in the periplasm of the human pathogen Pseudomonas aeruginosa. The genome of P. aeruginosa uniquely encodes two DsbA proteins (P. aeruginosa DsbA1 [PaDsbA1] and PaDsbA2) and two DsbB proteins (PaDsbB1 and PaDsbB2). We found that PaDsbA1, the primary donor of disulfide bonds to secreted proteins, is maintained oxidized in vivo by both PaDsbB1 and PaDsbB2. In vitro reconstitution of the pathway confirms that both PaDsbB1 and PaDsbB2 shuttle electrons from PaDsbA1 to membrane-bound quinones. Accordingly, deletion of both P. aeruginosa dsbB1 (PadsbB1) and PadsbB2 is required to prevent the folding of several P. aeruginosa virulence factors and to lead to a significant decrease in pathogenicity. Using a high-throughput proteomic approach, we also analyzed the impact of PadsbA1 deletion on the global periplasmic proteome of P. aeruginosa, which allowed us to identify more than 20 new potential substrates of this major oxidoreductase. Finally, we report the biochemical and structural characterization of PaDsbA2, a highly oxidizing oxidoreductase, which seems to be expressed under specific conditions. By fully dissecting the machinery that introduces disulfide bonds in P. aeruginosa, our work opens the way to the design of novel antibacterial molecules able to disarm this pathogen by preventing the proper assembly of its arsenal of virulence factors. IMPORTANCE The human pathogen Pseudomonas aeruginosa causes life-threatening infections in immunodepressed and cystic fibrosis patients. The emergence of P. aeruginosa strains resistant to all of the available antibacterial agents calls for the urgent development of new antibiotics active against this bacterium. The pathogenic power of P. aeruginosa is mediated by an arsenal of extracellular virulence factors, most of which are stabilized by disulfide bonds. Thus, targeting the machinery that introduces disulfide bonds appears to be a promising strategy to combat P. aeruginosa. Here, we unraveled the oxidative protein folding system of P. aeruginosa in full detail. The system uniquely consists of two membrane proteins that generate disulfide bonds de novo to deliver them to P. aeruginosa DsbA1 (PaDsbA1), a soluble oxidoreductase. PaDsbA1 in turn donates disulfide bonds to secreted proteins, including virulence factors. Disruption of the disulfide bond formation machinery dramatically decreases P. aeruginosa virulence, confirming that disulfide formation systems are valid targets for the design of antimicrobial drugs.Isabelle S. ArtsGeneviève BallPauline LeverrierSteven GarvisValérie NicolaesDidier VertommenBérengère IzeVeronica Tamu DufeJoris MessensRomé VoulhouxJean-François ColletAmerican Society for MicrobiologyarticleMicrobiologyQR1-502ENmBio, Vol 4, Iss 6 (2013)
institution DOAJ
collection DOAJ
language EN
topic Microbiology
QR1-502
spellingShingle Microbiology
QR1-502
Isabelle S. Arts
Geneviève Ball
Pauline Leverrier
Steven Garvis
Valérie Nicolaes
Didier Vertommen
Bérengère Ize
Veronica Tamu Dufe
Joris Messens
Romé Voulhoux
Jean-François Collet
Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
description ABSTRACT Disulfide bond formation is required for the folding of many bacterial virulence factors. However, whereas the Escherichia coli disulfide bond-forming system is well characterized, not much is known on the pathways that oxidatively fold proteins in pathogenic bacteria. Here, we report the detailed unraveling of the pathway that introduces disulfide bonds in the periplasm of the human pathogen Pseudomonas aeruginosa. The genome of P. aeruginosa uniquely encodes two DsbA proteins (P. aeruginosa DsbA1 [PaDsbA1] and PaDsbA2) and two DsbB proteins (PaDsbB1 and PaDsbB2). We found that PaDsbA1, the primary donor of disulfide bonds to secreted proteins, is maintained oxidized in vivo by both PaDsbB1 and PaDsbB2. In vitro reconstitution of the pathway confirms that both PaDsbB1 and PaDsbB2 shuttle electrons from PaDsbA1 to membrane-bound quinones. Accordingly, deletion of both P. aeruginosa dsbB1 (PadsbB1) and PadsbB2 is required to prevent the folding of several P. aeruginosa virulence factors and to lead to a significant decrease in pathogenicity. Using a high-throughput proteomic approach, we also analyzed the impact of PadsbA1 deletion on the global periplasmic proteome of P. aeruginosa, which allowed us to identify more than 20 new potential substrates of this major oxidoreductase. Finally, we report the biochemical and structural characterization of PaDsbA2, a highly oxidizing oxidoreductase, which seems to be expressed under specific conditions. By fully dissecting the machinery that introduces disulfide bonds in P. aeruginosa, our work opens the way to the design of novel antibacterial molecules able to disarm this pathogen by preventing the proper assembly of its arsenal of virulence factors. IMPORTANCE The human pathogen Pseudomonas aeruginosa causes life-threatening infections in immunodepressed and cystic fibrosis patients. The emergence of P. aeruginosa strains resistant to all of the available antibacterial agents calls for the urgent development of new antibiotics active against this bacterium. The pathogenic power of P. aeruginosa is mediated by an arsenal of extracellular virulence factors, most of which are stabilized by disulfide bonds. Thus, targeting the machinery that introduces disulfide bonds appears to be a promising strategy to combat P. aeruginosa. Here, we unraveled the oxidative protein folding system of P. aeruginosa in full detail. The system uniquely consists of two membrane proteins that generate disulfide bonds de novo to deliver them to P. aeruginosa DsbA1 (PaDsbA1), a soluble oxidoreductase. PaDsbA1 in turn donates disulfide bonds to secreted proteins, including virulence factors. Disruption of the disulfide bond formation machinery dramatically decreases P. aeruginosa virulence, confirming that disulfide formation systems are valid targets for the design of antimicrobial drugs.
format article
author Isabelle S. Arts
Geneviève Ball
Pauline Leverrier
Steven Garvis
Valérie Nicolaes
Didier Vertommen
Bérengère Ize
Veronica Tamu Dufe
Joris Messens
Romé Voulhoux
Jean-François Collet
author_facet Isabelle S. Arts
Geneviève Ball
Pauline Leverrier
Steven Garvis
Valérie Nicolaes
Didier Vertommen
Bérengère Ize
Veronica Tamu Dufe
Joris Messens
Romé Voulhoux
Jean-François Collet
author_sort Isabelle S. Arts
title Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
title_short Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
title_full Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
title_fullStr Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
title_full_unstemmed Dissecting the Machinery That Introduces Disulfide Bonds in <named-content content-type="genus-species">Pseudomonas aeruginosa</named-content>
title_sort dissecting the machinery that introduces disulfide bonds in <named-content content-type="genus-species">pseudomonas aeruginosa</named-content>
publisher American Society for Microbiology
publishDate 2013
url https://doaj.org/article/ce7eb50e935a4fe1a8372d8e3636f5f9
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