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Jonsmoen UL, Malyshev D, Öberg R, Dahlberg T, Aspholm ME, Andersson M. Endospore pili: Flexible, stiff, and sticky nanofibers. Biophys J 2023; 122:2696-2706. [PMID: 37218131 PMCID: PMC10397575 DOI: 10.1016/j.bpj.2023.05.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 03/29/2023] [Accepted: 05/18/2023] [Indexed: 05/24/2023] Open
Abstract
Species belonging to the Bacillus cereus group form endospores (spores) whose surface is decorated with micrometers-long and nanometers-wide endospore appendages (Enas). The Enas have recently been shown to represent a completely novel class of Gram-positive pili. They exhibit remarkable structural properties making them extremely resilient to proteolytic digestion and solubilization. However, little is known about their functional and biophysical properties. In this work, we apply optical tweezers to manipulate and assess how wild-type and Ena-depleted mutant spores immobilize on a glass surface. Furthermore, we utilize optical tweezers to extend S-Ena fibers to measure their flexibility and tensile stiffness. Finally, by oscillating single spores, we examine how the exosporium and Enas affect spores' hydrodynamic properties. Our results show that S-Enas (μm-long pili) are not as effective as L-Enas in immobilizing spores to glass surfaces but are involved in forming spore-to-spore connections, holding the spores together in a gel-like state. The measurements also show that S-Enas are flexible but tensile stiff fibers, which support structural data suggesting that the quaternary structure is composed of subunits arranged in a complex to produce a bendable fiber (helical turns can tilt against each other) with limited axial fiber extensibility. Finally, the results show that the hydrodynamic drag is 1.5 times higher for wild-type spores expressing S- and L-Enas compared with mutant spores expressing only L-Enas or "bald spores" lacking Ena, and 2 times higher compared with spores of the exosporium-deficient strain. This study unveils novel findings on the biophysics of S- and L-Enas, their role in spore aggregation, binding of spores to glass, and their mechanical behavior upon exposure to drag forces.
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Affiliation(s)
- Unni Lise Jonsmoen
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway
| | | | - Rasmus Öberg
- Department of Physics, Umeå University, Umeå, Sweden
| | | | - Marina E Aspholm
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway.
| | - Magnus Andersson
- Department of Physics, Umeå University, Umeå, Sweden; Umeå Centre for Microbial Research (UCMR), Umeå, Sweden.
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Alvarez-Molina A, Trigal E, Prieto M, López M, Alvarez-Ordóñez A. Assessment of a plasmid conjugation procedure to monitor horizontal transfer of an extended-spectrum β-lactamase resistance gene under food chain scenarios. Curr Res Food Sci 2022; 6:100405. [PMID: 36506112 PMCID: PMC9732120 DOI: 10.1016/j.crfs.2022.11.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/23/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022] Open
Abstract
Plasmids are relevant reservoirs of antimicrobial resistance genes (ARGs) which confer adaptive advantages to their host and can be horizontally transferred. The aims of this study were to develop a conjugation procedure to monitor the horizontal transfer of a 193 kb plasmid containing the extended-spectrum β-lactamase production gene bla CTX-M-14 between two Escherichia coli strains under a range of food chain-related scenarios, including temperature (20-37 °C), pH (5.0-9.0) or the presence of some biocidal agents (benzalkonium chloride, sodium hypochlorite or peracetic acid). The average conjugation rate in LB broth after 18 h at 37 °C was 2.09e-04 and similar rates were observed in a food matrix (cow's milk). The conjugation was reduced at temperatures below 37 °C, at alkaline pH (especially at pH 9.0) or in the presence of benzalkonium chloride. Peracetic acid and sodium hypochlorite slightly increased conjugation rates, which reached 5.59e-04 and 6.77e-03, respectively. The conjugation procedure described can be used to identify risk scenarios leading to an enhanced ARGs transmission via plasmid conjugation, as well as to identify novel intervention strategies impairing plasmid conjugation and tackling antimicrobial resistance.
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Affiliation(s)
| | - Elena Trigal
- Department of Food Hygiene and Technology, Universidad de León, León, Spain
| | - Miguel Prieto
- Department of Food Hygiene and Technology, Universidad de León, León, Spain,Institute of Food Science and Technology, Universidad de León, León, Spain
| | - Mercedes López
- Department of Food Hygiene and Technology, Universidad de León, León, Spain,Institute of Food Science and Technology, Universidad de León, León, Spain
| | - Avelino Alvarez-Ordóñez
- Department of Food Hygiene and Technology, Universidad de León, León, Spain,Institute of Food Science and Technology, Universidad de León, León, Spain,Corresponding author. Campus de Vegazana, Veterinary Faculty, León, Spain.
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Fan E, Chavez JA, Chavez JM, Christie AL, Zimmern PE. Does urinary pH and diet influence the rate of urinary tract infection recurrence after electrofulguration in women with antibiotic-recalcitrant recurrent urinary tract infections? Urology 2022; 164:94-99. [DOI: 10.1016/j.urology.2022.01.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 11/29/2022]
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Abstract
Although feline urinary tract diseases cause high morbidity and mortality rates, and subclinical bacteriuria is not uncommon, the feline urinary microbiome has not been characterized. We conducted a case-control study to identify the feline urinary bladder microbiome and assess its association with chronic kidney disease (CKD), feline idiopathic cystitis (FIC), and positive urine cultures (PUCs). Of 108 feline urine samples subjected to 16S rRNA gene sequencing, 48 (44.4%) samples reached the 500-sequence rarefaction threshold and were selected for further analysis, suggesting that the feline bladder microbiome is typically sparse. Selected samples included 17 CKD, 9 FIC, 8 PUC cases and 14 controls. Among these, 19 phyla, 145 families, and 218 genera were identified. Proteobacteria were the most abundant, followed by Firmicutes. Notably, four major urotypes were identified, including two urotypes predominated by Escherichia-Shigella or Enterococcus and two others characterized by relatively high alpha diversity, Diverse 1 and Diverse 2. Urotype was associated with disease status (P value of 0.040), with the Escherichia-Shigella-predominant urotype being present in 53% of CKD cases and in all of the Escherichia coli PUC cases. Reflecting these patterns, the overall microbial composition of CKD cases was more similar to that of E. coli PUC cases than to that of controls (P value of <0.001). Finally, PUC cases had microbial compositions distinct from those of controls as well as CKD and FIC cases, with significantly lower Shannon diversity and Faith’s phylogenetic diversity values. IMPORTANCE Despite the clinical importance of urinary diseases in cats, the presence of resident urine microbes has not been demonstrated in cats, and the role of these microbes as a community in urinary health remains unknown. Here, we have shown that cats with and without urinary tract disease harbor unique microbial communities in their urine. We found no evidence to suggest that the bladder microbiome is implicated in the pathogenesis of feline idiopathic cystitis, a disease similar to bladder pain syndrome/interstitial cystitis in humans. However, cats with chronic kidney disease had dysbiosis of their bladder microbiome, which was predominated by Escherichia-Shigella and had a community structure similar to that of cats with Escherichia coli cystitis. These findings suggest that chronic kidney disease alters the bladder environment to favor Escherichia-Shigella colonization, potentially increasing the risk of overt clinical infection.
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Lai HC, Chang SN, Lin HC, Hsu YL, Wei HM, Kuo CC, Hwang KP, Chiang HY. Association between urine pH and common uropathogens in children with urinary tract infections. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2019; 54:290-298. [PMID: 31604680 DOI: 10.1016/j.jmii.2019.08.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 08/19/2019] [Accepted: 08/31/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND/PURPOSE Urinary tract infections (UTIs) are one of the most common pediatric infections. Our objective in this study is to investigate the association between urine pH and uropathogens in pediatric patients. METHODS The source population comprised 26 066 paired urinalysis (UA) and urine culture (UC) samples obtained from pediatric patients. We classified the paired UA-UC samples into UTI positive (N = 6348) and UTI negative (N = 19 718) according to the colony forming units corresponding to the sampling source. We included UTI positive patients with infection caused by a single species of pathogen (N = 5201) and frequency matched them with UTI negative patients (N = 4729) by age, sex, sampling source, and visit type. RESULTS This study included 5201 pediatric patients with UTIs and found that urine with Proteus mirabilis or Pseudomonas aeruginosa demonstrated the least acidic pH (mean pH = 6.72 and 6.62, respectively), whereas urine with Escherichia coli or Klebsiella pneumoniae exhibited the most acidic pH (pH = 6.21 and 6.18). After stratifying the UTI samples by their pH range (<6, 6-6.9, 7-7.9, and ≥8). The prevalence of P. mirabilis increased significantly across increasing pH categories. CONCLUSION This research is the first epidemiological study that linked urine pH to specific uropathogens in a pediatric population. Both urine pH and age are associated with certain causative uropathogens. Urine that grew P. mirabilis or P. aeruginosa had the least acidic pH. Additional studies should validate the role of urine pH in predicting uropathogens and UTI.
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Affiliation(s)
- Huan-Cheng Lai
- Division of Pediatric Infectious Diseases, China Medical University Children's Hospital, China Medical University, Taichung, Taiwan
| | - Shih-Ni Chang
- Big Data Center, China Medical University Hospital, Taichung, Taiwan; The PhD Program for Cancer Biology and Drug Discovery, College of Medicine, China Medical University, Taichung, Taiwan
| | - Hsiao-Chuan Lin
- Division of Pediatric Infectious Diseases, China Medical University Children's Hospital, China Medical University, Taichung, Taiwan; School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan
| | - Yu-Lung Hsu
- Division of Pediatric Infectious Diseases, China Medical University Children's Hospital, China Medical University, Taichung, Taiwan
| | - Hsiu-Mei Wei
- Division of Pediatric Infectious Diseases, China Medical University Children's Hospital, China Medical University, Taichung, Taiwan
| | - Chin-Chi Kuo
- Big Data Center, China Medical University Hospital, Taichung, Taiwan; School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan; Kidney Institute, China Medical University Hospital, Taichung, Taiwan
| | - Kao-Pin Hwang
- Division of Pediatric Infectious Diseases, China Medical University Children's Hospital, China Medical University, Taichung, Taiwan; School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan.
| | - Hsiu-Yin Chiang
- Big Data Center, China Medical University Hospital, Taichung, Taiwan.
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Formosa-Dague C, Castelain M, Martin-Yken H, Dunker K, Dague E, Sletmoen M. The Role of Glycans in Bacterial Adhesion to Mucosal Surfaces: How Can Single-Molecule Techniques Advance Our Understanding? Microorganisms 2018; 6:E39. [PMID: 29734645 PMCID: PMC6027152 DOI: 10.3390/microorganisms6020039] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 04/24/2018] [Accepted: 04/26/2018] [Indexed: 12/14/2022] Open
Abstract
Bacterial adhesion is currently the subject of increased interest from the research community, leading to fast progress in our understanding of this complex phenomenon. Resent research within this field has documented the important roles played by glycans for bacterial surface adhesion, either through interaction with lectins or with other glycans. In parallel with this increased interest for and understanding of bacterial adhesion, there has been a growth in the sophistication and use of sensitive force probes for single-molecule and single cell studies. In this review, we highlight how the sensitive force probes atomic force microscopy (AFM) and optical tweezers (OT) have contributed to clarifying the mechanisms underlying bacterial adhesion to glycosylated surfaces in general and mucosal surfaces in particular. We also describe research areas where these techniques have not yet been applied, but where their capabilities appear appropriate to advance our understanding.
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Affiliation(s)
| | - Mickaël Castelain
- LISBP, Université de Toulouse, CNRS, INRA, INSA, 31400 Toulouse, France.
| | - Hélène Martin-Yken
- LISBP, Université de Toulouse, CNRS, INRA, INSA, 31400 Toulouse, France.
| | - Karen Dunker
- Department of Biotechnology and Food Science, NTNU the Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
| | - Etienne Dague
- LAAS-CNRS, Université de Toulouse, CNRS, 31400 Toulouse, France.
| | - Marit Sletmoen
- Department of Biotechnology and Food Science, NTNU the Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
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Azevedo AS, Almeida C, Gomes LC, Ferreira C, Mergulhão FJ, Melo LF, Azevedo NF. An in vitro model of catheter-associated urinary tract infections to investigate the role of uncommon bacteria on the Escherichia coli microbial consortium. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2016.11.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Differentiation of Crohn's Disease-Associated Isolates from Other Pathogenic Escherichia coli by Fimbrial Adhesion under Shear Force. BIOLOGY 2016; 5:biology5020014. [PMID: 27043645 PMCID: PMC4929528 DOI: 10.3390/biology5020014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 03/22/2016] [Accepted: 03/24/2016] [Indexed: 12/20/2022]
Abstract
Shear force exerted on uropathogenic Escherichia coli adhering to surfaces makes type-1 fimbriae stretch out like springs to catch on to mannosidic receptors. This mechanism is initiated by a disruption of the quaternary interactions between the lectin and the pilin of the two-domain FimH adhesin and transduces allosterically to the mannose-binding pocket of FimH to increase its affinity. Mannose-specific adhesion of 14 E. coli pathovars was measured under flow, using surface plasmon resonance detection on functionalized graphene-coated gold interfaces. Increasing the shear had important differential consequences on bacterial adhesion. Adherent-invasive E. coli, isolated from the feces and biopsies of Crohn’s disease patients, consistently changed their adhesion behavior less under shear and displayed lower SPR signals, compared to E. coli opportunistically infecting the urinary tract, intestines or loci of knee and hip prostheses. We exemplified this further with the extreme behaviors of the reference strains UTI89 and LF82. Whereas their FimA major pilins have identical sequences, FimH of LF82 E. coli is marked by the Thr158Pro mutation. Positioned in the inter-domain region known to carry hot spots of mutations in E. coli pathotypes, residue 158 is indicated to play a structural role in the allosteric regulation of type-1 fimbriae-mediated bacterial adhesion.
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9
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Castelain M, Duviau MP, Canette A, Schmitz P, Loubière P, Cocaign-Bousquet M, Piard JC, Mercier-Bonin M. The Nanomechanical Properties of Lactococcus lactis Pili Are Conditioned by the Polymerized Backbone Pilin. PLoS One 2016; 11:e0152053. [PMID: 27010408 PMCID: PMC4806873 DOI: 10.1371/journal.pone.0152053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 03/08/2016] [Indexed: 12/16/2022] Open
Abstract
Pili produced by Lactococcus lactis subsp. lactis are putative linear structures consisting of repetitive subunits of the major pilin PilB that forms the backbone, pilin PilA situated at the distal end of the pilus, and an anchoring pilin PilC that tethers the pilus to the peptidoglycan. We determined the nanomechanical properties of pili using optical-tweezers force spectroscopy. Single pili were exposed to optical forces that yielded force-versus-extension spectra fitted using the Worm-Like Chain model. Native pili subjected to a force of 0–200 pN exhibit an inextensible, but highly flexible ultrastructure, reflected by their short persistence length. We tested a panel of derived strains to understand the functional role of the different pilins. First, we found that both the major pilin PilB and sortase C organize the backbone into a full-length organelle and dictate the nanomechanical properties of the pili. Second, we found that both PilA tip pilin and PilC anchoring pilin were not essential for the nanomechanical properties of pili. However, PilC maintains the pilus on the bacterial surface and may play a crucial role in the adhesion- and biofilm-forming properties of L. lactis.
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Affiliation(s)
- Mickaël Castelain
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
- * E-mail:
| | - Marie-Pierre Duviau
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
| | - Alexis Canette
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Philippe Schmitz
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
| | - Pascal Loubière
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
| | - Muriel Cocaign-Bousquet
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
| | - Jean-Christophe Piard
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Muriel Mercier-Bonin
- Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400, Toulouse, France
- CNRS, UMR5504, F-31400, Toulouse, France
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Azevedo AS, Almeida C, Pereira B, Melo LF, Azevedo NF. Impact of Delftia tsuruhatensis and Achromobacter xylosoxidans on Escherichia coli dual-species biofilms treated with antibiotic agents. BIOFOULING 2016; 32:227-241. [PMID: 26901701 DOI: 10.1080/08927014.2015.1124096] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Recently it was demonstrated that for urinary tract infections species with a lower or unproven pathogenic potential, such as Delftia tsuruhatensis and Achromobacter xylosoxidans, might interact with conventional pathogenic agents such as Escherichia coli. Here, single- and dual-species biofilms of these microorganisms were characterized in terms of microbial composition over time, the average fitness of E. coli, the spatial organization and the biofilm antimicrobial profile. The results revealed a positive impact of these species on the fitness of E. coli and a greater tolerance to the antibiotic agents. In dual-species biofilms exposed to antibiotics, E. coli was able to dominate the microbial consortia in spite of being the most sensitive strain. This is the first study demonstrating the protective effect of less common species over E. coli under adverse conditions imposed by the use of antibiotic agents.
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Affiliation(s)
- Andreia S Azevedo
- a Laboratory for Process Engineering, Environment, and Energy and Biotechnology Engineering (LEPABE), Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
- b Nucleic Acid Center, Department of Physics, Chemistry and Pharmacy , University of Southern Denmark , Odense M , Denmark
| | - Carina Almeida
- a Laboratory for Process Engineering, Environment, and Energy and Biotechnology Engineering (LEPABE), Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
- c Institute for Biotechnology and Bioengineering (IBB), Centre of Biological Engineering , Universidade do Minho , Braga , Portugal
| | - Bruno Pereira
- a Laboratory for Process Engineering, Environment, and Energy and Biotechnology Engineering (LEPABE), Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
| | - Luís F Melo
- a Laboratory for Process Engineering, Environment, and Energy and Biotechnology Engineering (LEPABE), Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
| | - Nuno F Azevedo
- a Laboratory for Process Engineering, Environment, and Energy and Biotechnology Engineering (LEPABE), Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
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Zagorodko O, Bouckaert J, Dumych T, Bilyy R, Larroulet I, Yanguas Serrano A, Alvarez Dorta D, Gouin SG, Dima SO, Oancea F, Boukherroub R, Szunerits S. Surface Plasmon Resonance (SPR) for the Evaluation of Shear-Force-Dependent Bacterial Adhesion. BIOSENSORS-BASEL 2015; 5:276-87. [PMID: 26018780 PMCID: PMC4493549 DOI: 10.3390/bios5020276] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 05/19/2015] [Indexed: 01/05/2023]
Abstract
The colonization of Escherichia coli (E. coli) to host cell surfaces is known to be a glycan-specific process that can be modulated by shear stress. In this work we investigate whether flow rate changes in microchannels integrated on surface plasmon resonance (SPR) surfaces would allow for investigating such processes in an easy and high-throughput manner. We demonstrate that adhesion of uropathogenic E. coli UTI89 on heptyl α-d-mannopyranoside-modified gold SPR substrates is minimal under almost static conditions (flow rates of 10 µL·min−1), and reaches a maximum at flow rates of 30 µL·min−1 (≈30 mPa). This concept is applicable to the investigation of any ligand-pathogen interactions, offering a robust, easy, and fast method for screening adhesion characteristics of pathogens to ligand-modified interfaces.
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Affiliation(s)
- Oleksandr Zagorodko
- Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR-CNRS 8520, Université Lille 1, Cité Scientifique, 59655 Villeneuve d'Ascq, France.
| | - Julie Bouckaert
- Unité de Glycobiologie Structurale et Fonctionnelle (UGSF), UMR8576 du CNRS, Université Lille 1, 59655 Villeneuve d'Ascq, France.
| | - Tetiana Dumych
- Unité de Glycobiologie Structurale et Fonctionnelle (UGSF), UMR8576 du CNRS, Université Lille 1, 59655 Villeneuve d'Ascq, France.
| | - Rostyslav Bilyy
- Institute of Cell Biology, National Academy of Sciences of Ukraine, 79005 Lviv, Ukraine.
| | - Iban Larroulet
- SENSIA SL, Poligono Aranguren, 9, Apdo. Correos 171, 20180 Oiartzun, Gipuzkoa, Spain.
| | - Aritz Yanguas Serrano
- SENSIA SL, Poligono Aranguren, 9, Apdo. Correos 171, 20180 Oiartzun, Gipuzkoa, Spain.
| | - Dimitri Alvarez Dorta
- LUNAM Université, CEISAM, UMR 6230 du CNRS, 2, rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France.
| | - Sebastien G Gouin
- LUNAM Université, CEISAM, UMR 6230 du CNRS, 2, rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France.
| | - Stefan-Ovidiu Dima
- Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR-CNRS 8520, Université Lille 1, Cité Scientifique, 59655 Villeneuve d'Ascq, France.
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu, 011061 Bucharest, Romania.
- National R&D Institute for Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Florin Oancea
- National R&D Institute for Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Rabah Boukherroub
- Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR-CNRS 8520, Université Lille 1, Cité Scientifique, 59655 Villeneuve d'Ascq, France.
| | - Sabine Szunerits
- Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR-CNRS 8520, Université Lille 1, Cité Scientifique, 59655 Villeneuve d'Ascq, France.
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12
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Jacquot A, Sakamoto C, Razafitianamarahavo A, Caillet C, Merlin J, Fahs A, Ghigo JM, Duval JFL, Beloin C, Francius G. The dynamics and pH-dependence of Ag43 adhesins' self-association probed by atomic force spectroscopy. NANOSCALE 2014; 6:12665-12681. [PMID: 25208582 DOI: 10.1039/c4nr03312d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Self-associating auto-transporter (SAAT) adhesins are two-domain cell surface proteins involved in bacteria auto-aggregation and biofilm formation. Antigen 43 (Ag43) is a SAAT adhesin commonly found in Escherichia coli whose variant Ag43a has been shown to promote persistence of uropathogenic E. coli within the bladder. The recent resolution of the tri-dimensional structure of the 499 amino-acids' β-domain in Ag43a has shed light on the possible mechanism governing the self-recognition of SAAT adhesins, in particular the importance of trans-interactions between the L shaped β-helical scaffold of two α-domains of neighboring adhesins. In this study, we use single-molecule force spectroscopy (SMFS) and dynamic force spectroscopy (DFS) to unravel the dynamics of Ag43-self association under various pH and molecular elongation rate conditions that mimic the situations encountered by E. coli in its natural environment. Results evidenced an important stretchability of Ag43α with unfolding of sub-domains leading to molecular extension as long as 150 nm. Nanomechanical analysis of molecular stretching data suggested that self-association of Ag43 can lead to the formation of dimers and tetramers driven by rapid and weak cis- as well as slow but strong trans-interaction forces with a magnitude as large as 100-250 pN. The dynamics of cis- and trans-interactions were demonstrated to be strongly influenced by pH and applied shear force, thus suggesting that environmental conditions can modulate Ag43-mediated aggregation of bacteria at the molecular level.
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Affiliation(s)
- Adrien Jacquot
- Université de Lorraine, Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, UMR 7564, Villers-lès-Nancy, F-54601, France
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Piasecka M, Fraczek M, Gaczarzewicz D, Gill K, Szumala-Kakol A, Kazienko A, Laszczynska M, Lenart S, Beutin L, Kurpisz M. Novel Morphological Findings of Human Sperm Removal by Leukocytes inIn VivoandIn VitroConditions: Preliminary Study. Am J Reprod Immunol 2014; 72:348-58. [DOI: 10.1111/aji.12284] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 05/31/2014] [Indexed: 12/25/2022] Open
Affiliation(s)
- Malgorzata Piasecka
- Department of Histology and Developmental Biology; Pomeranian Medical University; Szczecin Poland
| | - Monika Fraczek
- Department of Reproductive Biology and Stem Cells; Institute of Human Genetics; Polish Academy of Sciences; Poznan Poland
| | - Dariusz Gaczarzewicz
- Department of Animal Reproduction, Biotechnology and Environmental Hygiene; West Pomeranian University of Technology; Szczecin Poland
| | - Kamil Gill
- Department of Histology and Developmental Biology; Pomeranian Medical University; Szczecin Poland
| | | | - Anna Kazienko
- Department of Histology and Developmental Biology; Pomeranian Medical University; Szczecin Poland
| | - Maria Laszczynska
- Department of Histology and Developmental Biology; Pomeranian Medical University; Szczecin Poland
| | - Stanislaw Lenart
- Institute of Materials Engineering; West Pomeranian University of Technology; Szczecin Poland
| | - Lothar Beutin
- Department of Biological Safety; Federal Institute for Risk Assessment (BfR); Berlin Germany
| | - Maciej Kurpisz
- Department of Reproductive Biology and Stem Cells; Institute of Human Genetics; Polish Academy of Sciences; Poznan Poland
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Ordered and ushered; the assembly and translocation of the adhesive type I and p pili. BIOLOGY 2013; 2:841-60. [PMID: 24833049 PMCID: PMC3960871 DOI: 10.3390/biology2030841] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 05/21/2013] [Accepted: 05/24/2013] [Indexed: 11/17/2022]
Abstract
Type I and P pili are chaperone-usher pili of uropathogenic Escherichia coli, which allow bacteria to adhere to host cell receptors. Pilus formation and secretion are orchestrated by two accessory proteins, a chaperone, which catalyses pilus subunit folding and maintains them in a polymerization-competent state, and an outer membrane-spanning nanomachine, the usher, which choreographs their assembly into a pilus and drives their secretion through the membrane. In this review, recent structures and kinetic studies are combined to examine the mechanism of type I and P pili assembly, as it is currently known. We also investigate how the knowledge of pilus biogenesis mechanisms has been exploited to design selective inhibitors of the process.
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Cerqueira L, Oliveira JA, Nicolau A, Azevedo NF, Vieira MJ. Biofilm formation with mixed cultures of Pseudomonas aeruginosa/Escherichia coli on silicone using artificial urine to mimic urinary catheters. BIOFOULING 2013; 29:829-40. [PMID: 23837894 DOI: 10.1080/08927014.2013.807913] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In this study, single and dual species biofilms of Pseudomonas aeruginosa and Escherichia coli, two common bacteria associated with urinary tract infections, were formed in silicon coupons immersed in artificial urine medium. In single species experiments, E. coli appeared to form biofilms more easily than P. aeruginosa. In mixed biofilms, both species apparently benefited from the presence of the other, as the average Log total cells cm(-2) of mixed biofilms (7.29 cells cm(-2)) was higher than obtained for single cultures (6.99 cells cm(-2)). However, the use of selective media seemed to indicate that P. aeruginosa was the only microorganism to benefit in mixed biofilms (Log 7 CFU of P. aeruginosa cm(-2), compared to Log 6 CFU cm(-2) obtained in pure cultures). Peptide nucleic acid-fluorescence in situ hybridization combined with confocal laser scanning microscopy confirmed that E. coli was indeed being outnumbered by P. aeruginosa at 48 h. Whereas E. coli is the main causative agent of catheter-associated urinary tract infections, the results from this study indicate that the reason for the higher prevalence of this microorganism is not related to an enhanced ability to form biofilm and outcompete other species that may also be present, but rather to a better ability to form single-species biofilms possibly due to a more frequent access to the catheter surface.
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Affiliation(s)
- Laura Cerqueira
- Centre of Biological Engineering, IBB - Institute for Biotechnology and Bioengineering, University of Minho, Braga, Portugal
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