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Tarallo D, Martínez J, Leyva A, Mónaco A, Perroni C, Tassano M, Gambini JP, Cappetta M, Durán R, Moreno M, Quijano C. Mitofusin 1 silencing decreases the senescent associated secretory phenotype, promotes immune cell recruitment and delays melanoma tumor growth after chemotherapy. Sci Rep 2024; 14:909. [PMID: 38195762 PMCID: PMC10776601 DOI: 10.1038/s41598-024-51427-7] [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: 08/17/2023] [Accepted: 01/04/2024] [Indexed: 01/11/2024] Open
Abstract
Cellular senescence is a therapy endpoint in melanoma, and the senescence-associated secretory phenotype (SASP) can affect tumor growth and microenvironment, influencing treatment outcomes. Metabolic interventions can modulate the SASP, and mitochondrial energy metabolism supports resistance to therapy in melanoma. In a previous report we showed that senescence, induced by the DNA methylating agent temozolomide, increased the level of fusion proteins mitofusin 1 and 2 in melanoma, and silencing Mfn1 or Mfn2 expression reduced interleukin-6 secretion by senescent cells. Here we expanded these observations evaluating the secretome of senescent melanoma cells using shotgun proteomics, and explored the impact of silencing Mfn1 on the SASP. A significant increase in proteins reported to reduce the immune response towards the tumor was found in the media of senescent cells. The secretion of several of these immunomodulatory proteins was affected by Mfn1 silencing, among them was galectin-9. In agreement, tumors lacking mitofusin 1 responded better to treatment with the methylating agent dacarbazine, tumor size was reduced and a higher immune cell infiltration was detected in the tumor. Our results highlight mitochondrial dynamic proteins as potential pharmacological targets to modulate the SASP in the context of melanoma treatment.
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Affiliation(s)
- Doménica Tarallo
- Departamento de Bioquímica, Facultad de Medicina, and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Jennyfer Martínez
- Departamento de Bioquímica, Facultad de Medicina, and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Alejandro Leyva
- Institut Pasteur de Montevideo and Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Montevideo, Uruguay
| | - Amy Mónaco
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Carolina Perroni
- Area Radiofarmacia, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Marcos Tassano
- Area Radiofarmacia, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Juan Pablo Gambini
- Centro Uruguayo de Imagenología Molecular (CUDIM) and Centro de Medicina Nuclear (CMN), Hospital de Clínicas Dr. Manuel Quintela, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Mónica Cappetta
- Departamento de Genética, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Rosario Durán
- Institut Pasteur de Montevideo and Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Montevideo, Uruguay
| | - María Moreno
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
| | - Celia Quijano
- Departamento de Bioquímica, Facultad de Medicina, and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay.
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2
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Carrión F, Rammauro F, Olivero‐Deibe N, Fló M, Portela MM, Lima A, Durán R, Pritsch O, Bianchi S. Soluble SARS-CoV-2 RBD and human ACE2 peptidase domain produced in Drosophila S2 cells show functions evoking virus-cell interface. Protein Sci 2023; 32:e4721. [PMID: 37405395 PMCID: PMC10382795 DOI: 10.1002/pro.4721] [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: 04/03/2023] [Revised: 06/06/2023] [Accepted: 07/03/2023] [Indexed: 07/06/2023]
Abstract
The interaction between the receptor-binding domain (RBD) of the spike glycoprotein of SARS-CoV-2 and the peptidase domain of the human angiotensin-converting enzyme 2 (ACE2) allows the first specific contact at the virus-cell interface making it the main target of neutralizing antibodies. Here, we show a unique and cost-effective protocol using Drosophila S2 cells to produce both RBD and soluble human ACE2 peptidase domain (shACE2) as thermostable proteins, purified via Strep-tag with yields >40 mg L-1 in a laboratory scale. Furthermore, we demonstrate its binding with KD values in the lower nanomolar range (independently of Strep-tag removal) and its capability to be blocked by serum antibodies in a competition ELISA with Strep-Tactin-HRP as a proof-of-concept. In addition, we assess the capacity of RBD to bind native dimeric ACE2 overexpressed in human cells and its antigen properties with specific serum antibodies. Finally, for completeness, we analyzed RBD microheterogeneity associated with glycosylation and negative charges, with negligible effect on binding either with antibodies or shACE2. Our system represents an accessible and reliable tool for designing in-house surrogate virus neutralization tests (sVNTs), enabling the rapid characterization of neutralizing humoral responses elicited against vaccines or infection, especially in the absence of facilities to conduct virus neutralization tests. Moreover, our biophysical and biochemical characterization of RBD and shACE2 produced in S2 cells lays the groundwork for adapting to different variants of concern (VOCs) to study humoral responses elicited against different VOCs and vaccine formulations.
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Affiliation(s)
- Federico Carrión
- Laboratorio de InmunovirologíaInstitut Pasteur de MontevideoMontevideoUruguay
| | - Florencia Rammauro
- Laboratorio de InmunovirologíaInstitut Pasteur de MontevideoMontevideoUruguay
- Facultad de Medicina, Departamento de InmunobiologíaUniversidad de la RepúblicaMontevideoUruguay
| | | | - Martín Fló
- Laboratorio de InmunovirologíaInstitut Pasteur de MontevideoMontevideoUruguay
- Facultad de Medicina, Departamento de InmunobiologíaUniversidad de la RepúblicaMontevideoUruguay
| | - María Magdalena Portela
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente EstableMontevideoUruguay
- Facultad de CienciasUniversidad de la RepúblicaMontevideoUruguay
| | - Analía Lima
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente EstableMontevideoUruguay
| | - Rosario Durán
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente EstableMontevideoUruguay
| | - Otto Pritsch
- Laboratorio de InmunovirologíaInstitut Pasteur de MontevideoMontevideoUruguay
- Facultad de Medicina, Departamento de InmunobiologíaUniversidad de la RepúblicaMontevideoUruguay
| | - Sergio Bianchi
- Departamento de Fisiopatología, Laboratorio de Biomarcadores Moleculares, Hospital de ClínicasUniversidad de la RepúblicaMontevideoUruguay
- Laboratorio de Genómica FuncionalInstitut Pasteur de MontevideoMontevideoUruguay
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3
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Yao Y, Xi N, Hai E, Zhang X, Guo J, Lin Z, Huang W. PA0575 (RmcA) interacts with other c-di-GMP metabolizing proteins in Pseudomonas aeruginosa PAO1. J GEN APPL MICROBIOL 2023; 68:232-241. [PMID: 35732459 DOI: 10.2323/jgam.2022.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
As a central signaling molecule, c-di-GMP (bis-(3,5)-cyclic diguanosine monophosphate) is becoming the focus for research in bacteria physiology. Pseudomonas aeruginosa PAO1 genome contains highly complicated c-di-GMP metabolizing genes and a number of these proteins have been identified and investigated. Especially, a sophisticated network of these proteins is emerging. In current study, mainly through Bacteria-2-Hybrid assay, we found PA0575 (RmcA), a GGDEF-EAL dual protein, to interact with two other dual proteins of PA4601 (MorA) and PA4959 (FimX). These observations imply the intricacy of c-di-GMP metabolizing protein interactions. Our work thus provides one piece of data to increase the understandings to c-di-GMP signaling.
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Affiliation(s)
- Yanxiang Yao
- School of Basic Medicine, Department of Biochemistry and Molecular Biology, Ningxia Medical University
| | - Naren Xi
- School of Basic Medicine, Department of Biochemistry and Molecular Biology, Ningxia Medical University
| | - E Hai
- School of Basic Medicine, Department of Biochemistry and Molecular Biology, Ningxia Medical University
| | - Xiaomin Zhang
- Research Center of Medical Science and Technology, Ningxia Medical University
| | - Jiayi Guo
- Research Center of Medical Science and Technology, Ningxia Medical University
| | - Zhi Lin
- School of Life Sciences, Tianjin University
| | - Weidong Huang
- School of Basic Medicine, Department of Biochemistry and Molecular Biology, Ningxia Medical University
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4
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Kong W, Luo W, Wang Y, Liu Y, Tian Q, Zhao C, Liang H. Dual GGDEF/EAL-Domain Protein RmcA Controls the Type III Secretion System of Pseudomonas aeruginosa by Interaction with CbrB. ACS Infect Dis 2022; 8:2441-2450. [PMID: 36379019 DOI: 10.1021/acsinfecdis.2c00212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cyclic diguanylate (c-di-GMP) is a major bacterial secondary signaling molecule that controls a multitude of cellular processes. More than 40 genes encoding diguanylate cyclases and phosphodiesterases have been identified in Pseudomonas aeruginosa, and many of them have been intensively investigated. However, the mechanism through which they achieve signaling specificity remains unclear. Here, we revealed that the absence of the dual GGDEF/EAL-domain protein RmcA significantly affected biofilm formation of P. aeruginosa PAO1 and led to upregulated expression of the type III secretion system (T3SS) genes; overexpression of RmcA strongly reduced the expression of T3SS. Further investigation showed that the regulatory function of RmcA was independent of the Gac/Rsm pathway. To identify the interaction partners of RmcA involved in this process, bacterial two-hybrid library screening was performed. We found that RmcA directly interacts with a two-component response regulator CbrB, which is involved in the regulation of biofilm formation and T3SS expression by RmcA. These findings reveal that the dual-domain GGDEF/EAL protein RmcA could achieve specificity of action through physical interaction with CbrB, which extends understanding the complex regulatory network of the c-di-GMP signaling.
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Affiliation(s)
- Weina Kong
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Wei Luo
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Yaya Wang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Yu Liu
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Qianqian Tian
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Cheng Zhao
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China
| | - Haihua Liang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, School of Life Sciences, Northwest University, Xi'an 710069, China.,School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
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5
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Eilers K, Kuok Hoong Yam J, Morton R, Mei Hui Yong A, Brizuela J, Hadjicharalambous C, Liu X, Givskov M, Rice SA, Filloux A. Phenotypic and integrated analysis of a comprehensive Pseudomonas aeruginosa PAO1 library of mutants lacking cyclic-di-GMP-related genes. Front Microbiol 2022; 13:949597. [PMID: 35935233 PMCID: PMC9355167 DOI: 10.3389/fmicb.2022.949597] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
Pseudomonas aeruginosa is a Gram-negative bacterium that is able to survive and adapt in a multitude of niches as well as thrive within many different hosts. This versatility lies within its large genome of ca. 6 Mbp and a tight control in the expression of thousands of genes. Among the regulatory mechanisms widespread in bacteria, cyclic-di-GMP signaling is one which influences all levels of control. c-di-GMP is made by diguanylate cyclases and degraded by phosphodiesterases, while the intracellular level of this molecule drives phenotypic responses. Signaling involves the modification of enzymes' or proteins' function upon c-di-GMP binding, including modifying the activity of regulators which in turn will impact the transcriptome. In P. aeruginosa, there are ca. 40 genes encoding putative DGCs or PDEs. The combined activity of those enzymes should reflect the overall c-di-GMP concentration, while specific phenotypic outputs could be correlated to a given set of dgc/pde. This notion of specificity has been addressed in several studies and different strains of P. aeruginosa. Here, we engineered a mutant library for the 41 individual dgc/pde genes in P. aeruginosa PAO1. In most cases, we observed a significant to slight variation in the global c-di-GMP pool of cells grown planktonically, while several mutants display a phenotypic impact on biofilm including initial attachment and maturation. If this observation of minor changes in c-di-GMP level correlating with significant phenotypic impact appears to be true, it further supports the idea of a local vs global c-di-GMP pool. In contrast, there was little to no effect on motility, which differs from previous studies. Our RNA-seq analysis indicated that all PAO1 dgc/pde genes were expressed in both planktonic and biofilm growth conditions and our work suggests that c-di-GMP networks need to be reconstructed for each strain separately and cannot be extrapolated from one to another.
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Affiliation(s)
- Kira Eilers
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Joey Kuok Hoong Yam
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Richard Morton
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Adeline Mei Hui Yong
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Jaime Brizuela
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London, United Kingdom
- Department of Medical Microbiology, Amsterdam UMC, Universitair Medische Centra, University of Amsterdam, Amsterdam, Netherlands
| | - Corina Hadjicharalambous
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London, United Kingdom
- Department of Biology, Institute of Molecular Biology and Biophysics, Eidgenössische Technische Hochschule Zürich, Zurich, Switzerland
| | - Xianghui Liu
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Michael Givskov
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, Costerton Biofilm Center, University of Copenhagen, Copenhagen, Denmark
| | - Scott A. Rice
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, Westmead and Microbiomes for One Systems Health, Melbourne, VIC, Australia
| | - Alain Filloux
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London, United Kingdom
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
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6
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Trochine A, Bellora N, Nizovoy P, Duran R, Greif G, de García V, Batthyany C, Robello C, Libkind D. Genomic and proteomic analysis of Tausonia pullulans reveals a key role for a GH15 glucoamylase in starch hydrolysis. Appl Microbiol Biotechnol 2022; 106:4655-4667. [PMID: 35713658 DOI: 10.1007/s00253-022-12025-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 11/25/2022]
Abstract
Basidiomycetous yeasts remain an almost unexplored source of enzymes with great potential in several industries. Tausonia pullulans (Tremellomycetes) is a psychrotolerant yeast with several extracellular enzymatic activities reported, although the responsible genes are not known. We performed the genomic sequencing, assembly and annotation of T. pullulans strain CRUB 1754 (Perito Moreno glacier, Argentina), a gene survey of carbohydrate-active enzymes (CAZymes), and analyzed its secretome by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) after growth in glucose (GLU) or starch (STA) as main carbon sources. T. pullulans has 7210 predicted genes, 3.6% being CAZymes. When compared to other Tremellomycetes, it contains a high number of CAZy domains, and in particular higher quantities of glucoamylases (GH15), pectinolytic enzymes (GH28) and lignocellulose decay enzymes (GH7). When the secretome of T. pullulans was analyzed experimentally after growth in starch or glucose, 98 proteins were identified. The 60% of total spectral counts belonged to GHs, oxidoreductases and to other CAZymes. A 65 kDa glucoamylase of family GH15 (TpGA1) showed the highest fold change (tenfold increase in starch). This enzyme contains a conserved active site and showed extensive N-glycosylation. This study increases the knowledge on the extracellular hydrolytic enzymes of basidiomycetous yeasts and, in particular, establishes T. pullulans as a potential source of carbohydrate-active enzymes. KEY POINTS: • Tausonia pullulans genome harbors a high number of genes coding for CAZymes. • Among CAZy domains/families, the glycoside hydrolases are the most abundant. • Secretome analysis in glucose or starch as main C sources identified 98 proteins. • A 65 kDa GH15 glucoamylase showed the highest fold increase upon culture in starch.
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Affiliation(s)
- Andrea Trochine
- Centro de Referencia en Levaduras Y Tecnología Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologías Biológicas Y Geoambientales (IPATEC), CONICET-Universidad Nacional del Comahue, Quintral 1250, (CP8400) San Carlos de Bariloche, Río Negro, Argentina.
| | - Nicolás Bellora
- Instituto de Tecnologías Nucleares Para La Salud (INTECNUS), RP82, (CP8400) San Carlos de Bariloche, Río Negro, Argentina
| | - Paula Nizovoy
- Centro de Referencia en Levaduras Y Tecnología Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologías Biológicas Y Geoambientales (IPATEC), CONICET-Universidad Nacional del Comahue, Quintral 1250, (CP8400) San Carlos de Bariloche, Río Negro, Argentina
| | - Rosario Duran
- Institut Pasteur de Montevideo (IPMont), Mataojo 2020, (CP11400), Montevideo, Uruguay
- Instituto de Investigaciones Biológicas Clemente Estable, Avenida Italia 3318, (CP 11600), Montevideo, Uruguay
| | - Gonzalo Greif
- Institut Pasteur de Montevideo (IPMont), Mataojo 2020, (CP11400), Montevideo, Uruguay
| | - Virginia de García
- Instituto de Investigación Y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas (PROBIEN), Buenos Aires 1400, (CP8300), Neuquén, Argentina
| | - Carlos Batthyany
- Institut Pasteur de Montevideo (IPMont), Mataojo 2020, (CP11400), Montevideo, Uruguay
- Facultad de Medicina (UDELAR), Av. Gral. Flores 2125, (CP1180), Montevideo, Uruguay
| | - Carlos Robello
- Institut Pasteur de Montevideo (IPMont), Mataojo 2020, (CP11400), Montevideo, Uruguay
- Facultad de Medicina (UDELAR), Av. Gral. Flores 2125, (CP1180), Montevideo, Uruguay
| | - Diego Libkind
- Centro de Referencia en Levaduras Y Tecnología Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologías Biológicas Y Geoambientales (IPATEC), CONICET-Universidad Nacional del Comahue, Quintral 1250, (CP8400) San Carlos de Bariloche, Río Negro, Argentina
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7
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Bouteiller M, Dupont C, Bourigault Y, Latour X, Barbey C, Konto-Ghiorghi Y, Merieau A. Pseudomonas Flagella: Generalities and Specificities. Int J Mol Sci 2021; 22:ijms22073337. [PMID: 33805191 PMCID: PMC8036289 DOI: 10.3390/ijms22073337] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 03/22/2021] [Accepted: 03/22/2021] [Indexed: 12/21/2022] Open
Abstract
Flagella-driven motility is an important trait for bacterial colonization and virulence. Flagella rotate and propel bacteria in liquid or semi-liquid media to ensure such bacterial fitness. Bacterial flagella are composed of three parts: a membrane complex, a flexible-hook, and a flagellin filament. The most widely studied models in terms of the flagellar apparatus are E. coli and Salmonella. However, there are many differences between these enteric bacteria and the bacteria of the Pseudomonas genus. Enteric bacteria possess peritrichous flagella, in contrast to Pseudomonads, which possess polar flagella. In addition, flagellar gene expression in Pseudomonas is under a four-tiered regulatory circuit, whereas enteric bacteria express flagellar genes in a three-step manner. Here, we use knowledge of E. coli and Salmonella flagella to describe the general properties of flagella and then focus on the specificities of Pseudomonas flagella. After a description of flagellar structure, which is highly conserved among Gram-negative bacteria, we focus on the steps of flagellar assembly that differ between enteric and polar-flagellated bacteria. In addition, we summarize generalities concerning the fuel used for the production and rotation of the flagellar macromolecular complex. The last part summarizes known regulatory pathways and potential links with the type-six secretion system (T6SS).
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Affiliation(s)
- Mathilde Bouteiller
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Charly Dupont
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Yvann Bourigault
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Xavier Latour
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Corinne Barbey
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Yoan Konto-Ghiorghi
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
| | - Annabelle Merieau
- LMSM, Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Normandy University, Université de Rouen, 27000 Evreux, France; (M.B.); (C.D.); (Y.B.); (X.L.); (C.B.); (Y.K.-G.)
- SFR NORVEGE, Structure Fédérative de Recherche Normandie Végétale, FED 4277, 76821 Mont-Saint-Aignan, France
- Correspondence:
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8
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Rivera B, Leyva A, Portela MM, Moratorio G, Moreno P, Durán R, Lima A. Quantitative proteomic dataset from oro- and naso-pharyngeal swabs used for COVID-19 diagnosis: Detection of viral proteins and host's biological processes altered by the infection. Data Brief 2020; 32:106121. [PMID: 32835036 PMCID: PMC7405904 DOI: 10.1016/j.dib.2020.106121] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 11/28/2022] Open
Abstract
Since January 2020, the world is facing the COVID-19 pandemic caused by SARS-CoV-2. In a big effort to cope with this outbreak, two Uruguayan institutions, Institut Pasteur de Montevideo and Universidad de la República, have developed and implemented a diagnosis pipeline based on qRT-PCR using entirely local resources. In this context, we performed comparative quantitative proteomic analysis from oro- and naso-pharyngeal swabs used for diagnosis. Tryptic peptides obtained from five positive and five negative samples were analysed by nano-LC-MS/MS using a Q-Exactive Plus mass spectrometer. Data analysis was performed using PatternLab for Proteomics software. From all SARS-CoV-2 positive swabs we were able to detect peptides of the SARS-CoV-2 nucleoprotein that encapsulates and protect the RNA genome. Additionally, we detected an average of 1100 human proteins from each sample. The most abundant proteins exclusively detected in positive swabs were “Guanylate-binding protein 1”, “Tapasin” and “HLA class II histocompatibility antigen DR beta chain”. The biological processes overrepresented in infected host cells were “SRP-dependent cotranslational protein targeting to membrane”, “nuclear-transcribed mRNA catabolic process, nonsense-mediated decay”, “viral transcription” and “translational initiation”. Data is available via ProteomeXchange with identifier PXD020394. We expect that this data can contribute to the future development of mass spectrometry based approaches for COVID-19 diagnosis. Also, we share this preliminary proteomic characterization concerning the host response to infection for its reuse in basic investigation.
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Affiliation(s)
- Bernardina Rivera
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente Estable, Mataojo 2020, CP 11400 Montevideo, Uruguay
| | - Alejandro Leyva
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente Estable, Mataojo 2020, CP 11400 Montevideo, Uruguay
| | - María Magdalena Portela
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente Estable, Mataojo 2020, CP 11400 Montevideo, Uruguay.,Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Gonzalo Moratorio
- Laboratorio de Inmunovirología, Institut Pasteur de Montevideo, Uruguay.,Laboratorio de Virología Molecular, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Pilar Moreno
- Laboratorio de Inmunovirología, Institut Pasteur de Montevideo, Uruguay.,Laboratorio de Virología Molecular, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Rosario Durán
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente Estable, Mataojo 2020, CP 11400 Montevideo, Uruguay
| | - Analía Lima
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo & Instituto de Investigaciones Biológicas Clemente Estable, Mataojo 2020, CP 11400 Montevideo, Uruguay
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9
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Feng Q, Ahator SD, Zhou T, Liu Z, Lin Q, Liu Y, Huang J, Zhou J, Zhang LH. Regulation of Exopolysaccharide Production by ProE, a Cyclic-Di-GMP Phosphodiesterase in Pseudomonas aeruginosa PAO1. Front Microbiol 2020; 11:1226. [PMID: 32582123 PMCID: PMC7290235 DOI: 10.3389/fmicb.2020.01226] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 05/14/2020] [Indexed: 11/13/2022] Open
Abstract
The ubiquitous second messenger c-di-GMP is involved in regulation of multiple biological functions including the important extracellular matrix exopolysaccharides (EPS). But how c-di-GMP metabolic proteins influence EPS and their enzymatic properties are not fully understood. Here we showed that deletion of proE, which encodes a protein with GGDEF-EAL hybrid domains, significantly increased the transcriptional expression of the genes encoding EPS production in Pseudomonas aeruginosa PAO1 and changed the bacterial colony morphology. Our data showed that ProE is a very active phosphodiesterase (PDE), with a high enzyme activity in degradation of c-di-GMP. Interestingly, the optimal activity of ProE was found in the presence of Co2+, unlike other PDEs that commonly rely on Mg2+ or Mn2+ for best performance. Furthermore, we identified three widely conserved novel residues that are critical for the function of ProE through site-directed mutagenesis. Subsequent study showed that ProE, together with other three key PDEs, i.e., RbdA, BifA, and DipA regulate the EPS production in P. aeruginosa PAO1. Moreover, by using the GFP-fusion approach, we observed that these four EPS associated-PDEs showed a polar localization pattern in general. Taken together, our data unveil the molecular mechanisms of ProE in regulation of EPS production, and provide a new insight on its enzymatic properties in degradation of c-di-GMP.
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Affiliation(s)
- Qishun Feng
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Stephen Dela Ahator
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Tian Zhou
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Zhiqing Liu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Qiqi Lin
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Yang Liu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Jiahui Huang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Jianuan Zhou
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
| | - Lian-Hui Zhang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China
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10
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Li Y, Ludford PT, Fin A, Rovira AR, Tor Y. Enzymatic Syntheses and Applications of Fluorescent Cyclic Dinucleotides. Chemistry 2020; 26:6076-6084. [PMID: 32157755 PMCID: PMC7220823 DOI: 10.1002/chem.202001194] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Indexed: 11/07/2022]
Abstract
Bacterial cyclic dinucleotides (CDNs) play important roles in regulating biofilm formation, motility and virulence. In eukaryotic cells, theses bacterial CDNs are recognized as pathogen-associated molecular patterns (PAMPs) and trigger an innate immune response. We report the photophysical analyses of a novel group of enzymatically synthesized emissive CDN analogues comprised of two families of isomorphic ribonucleotides. The highly favorable photophysical features of the CDN analogues, when compared to their non-emissive natural counterparts, are used to monitor in real time the dinucleotide cyclase-mediated synthesis and phosphodiesterase (PDE)-mediated hydrolysis of homodimeric and mixed CDNs, providing effective means to probe the activities of two classes of bacterial enzymes and insight into their biomolecular recognition and catalytic features.
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Affiliation(s)
- Yao Li
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Paul T Ludford
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Andrea Fin
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
- Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via P. Giuria 9, 10125, Turin, Italy
| | - Alexander R Rovira
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Yitzhak Tor
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
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11
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High Throughput Approaches to Unravel the Mechanism of Action of a New Vanadium-Based Compound against Trypanosoma cruzi. Bioinorg Chem Appl 2020; 2020:1634270. [PMID: 32351549 PMCID: PMC7171612 DOI: 10.1155/2020/1634270] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 01/03/2020] [Indexed: 12/17/2022] Open
Abstract
Treatment for Chagas disease, a parasitosis caused by Trypanosoma cruzi, has always been based on two drugs, nifurtimox and benznidazole, despite the toxic side effects described after prolonged prescription. In this work, we study a new prospective antitrypanosomal drug based on vanadium, here named VIVO(5Brsal)(aminophen). We found a good IC50 value, (3.76 ± 0.08) μM, on CL Brener epimastigotes. The analysis of cell death mechanism allowed us to rule out the implication of a mechanism based on early apoptosis or necrosis. Recovery assays revealed a trypanostatic effect, accompanied by cell shape and motility alterations. An uptake mostly associated with the insoluble fraction of the parasites was deduced through vanadium determinations. Concordantly, no drastic changes of the parasite transcriptome were detected after 6 h of treatment. Instead, proteomic analysis uncovered the modulation of proteins involved in different processes such as energy and redox metabolism, transport systems, detoxifying pathways, ribosomal protein synthesis, and proteasome protein degradation. Overall, the results here presented lead us to propose that VIVO(5Brsal)(aminophen) exerts a trypanostatic effect on T. cruzi affecting parasite insoluble proteins.
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12
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Multidrug Adaptive Resistance of Pseudomonas aeruginosa Swarming Cells. Antimicrob Agents Chemother 2020; 64:AAC.01999-19. [PMID: 31844008 DOI: 10.1128/aac.01999-19] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 12/10/2019] [Indexed: 01/25/2023] Open
Abstract
Swarming surface motility is a complex adaptation leading to multidrug antibiotic resistance and virulence factor production in Pseudomonas aeruginosa Here, we expanded previous studies to demonstrate that under swarming conditions, P. aeruginosa PA14 is more resistant to multiple antibiotics, including aminoglycosides, β-lactams, chloramphenicol, ciprofloxacin, tetracycline, trimethoprim, and macrolides, than swimming cells, but is not more resistant to polymyxin B. We investigated the mechanism(s) of swarming-mediated antibiotic resistance by examining the transcriptomes of swarming cells and swarming cells treated with tobramycin by transcriptomics (RNA-Seq) and reverse transcriptase quantitative PCR (qRT-PCR). RNA-Seq of swarming cells (versus swimming) revealed 1,581 dysregulated genes, including 104 transcriptional regulators, two-component systems, and sigma factors, numerous upregulated virulence and iron acquisition factors, and downregulated ribosomal genes. Strain PA14 mutants in resistome genes that were dysregulated under swarming conditions were tested for their ability to swarm in the presence of tobramycin. In total, 41 mutants in genes dysregulated under swarming conditions were shown to be more resistant to tobramycin under swarming conditions, indicating that swarming-mediated tobramycin resistance was multideterminant. Focusing on two genes downregulated under swarming conditions, both prtN and wbpW mutants were more resistant to tobramycin, while the prtN mutant was additionally resistant to trimethoprim under swarming conditions; complementation of these mutants restored susceptibility. RNA-Seq of swarming cells treated with subinhibitory concentrations of tobramycin revealed the upregulation of the multidrug efflux pump MexXY and downregulation of virulence factors.
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13
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Mosquillo MF, Smircich P, Ciganda M, Lima A, Gambino D, Garat B, Pérez-Díaz L. Comparative high-throughput analysis of the Trypanosoma cruzi response to organometallic compounds. Metallomics 2020; 12:813-828. [DOI: 10.1039/d0mt00030b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An in-depth, comparative look at the effects of two structurally related organometallic Pd and Pt compounds on the global gene expression pattern of T. cruzi epimastigotes. This parasite is the causative agent of Chagas disease.
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Affiliation(s)
- M. Florencia Mosquillo
- Laboratorio de Interacciones Moleculares
- Facultad de Ciencias
- Universidad de la República
- Montevideo
- Uruguay
| | - Pablo Smircich
- Laboratorio de Interacciones Moleculares
- Facultad de Ciencias
- Universidad de la República
- Montevideo
- Uruguay
| | | | - Analía Lima
- Instituto de Investigaciones Biológicas Clemente Estable
- Montevideo
- Uruguay
- Unidad de Bioquímica y Proteómica Analíticas
- Institut Pasteur de Montevideo
| | - Dinorah Gambino
- Área Química Inorgánica
- Facultad de Química
- Universidad de la República
- Montevideo
- Uruguay
| | - Beatriz Garat
- Laboratorio de Interacciones Moleculares
- Facultad de Ciencias
- Universidad de la República
- Montevideo
- Uruguay
| | - Leticia Pérez-Díaz
- Laboratorio de Interacciones Moleculares
- Facultad de Ciencias
- Universidad de la República
- Montevideo
- Uruguay
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14
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Fitting Pieces into the Puzzle of Pseudomonas aeruginosa Type III Secretion System Gene Expression. J Bacteriol 2019; 201:JB.00209-19. [PMID: 31010903 DOI: 10.1128/jb.00209-19] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Type III secretion systems (T3SS) are widely distributed in Gram-negative microorganisms and critical for host-pathogen and host-symbiont interactions with plants and animals. Central features of the T3SS are a highly conserved set of secretion and translocation genes and contact dependence wherein host-pathogen interactions trigger effector protein delivery and serve as an inducing signal for T3SS gene expression. In addition to these conserved features, there are pathogen-specific properties that include a unique repertoire of effector genes and mechanisms to control T3SS gene expression. The Pseudomonas aeruginosa T3SS serves as a model system to understand transcriptional and posttranscriptional mechanisms involved in the control of T3SS gene expression. The central regulatory feature is a partner-switching system that controls the DNA-binding activity of ExsA, the primary regulator of T3SS gene expression. Superimposed upon the partner-switching mechanism are cyclic AMP and cyclic di-GMP signaling systems, two-component systems, global regulators, and RNA-binding proteins that have positive and negative effects on ExsA transcription and/or synthesis. In the present review, we discuss advances in our understanding of how these regulatory systems orchestrate the activation of T3SS gene expression in the context of acute infections and repression of the T3SS as P. aeruginosa adapts to and colonizes the cystic fibrosis airways.
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15
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Zhang Y, Guo J, Zhang N, Yuan W, Lin Z, Huang W. Characterization and analysis of a novel diguanylate cyclase PA0847 from Pseudomonas aeruginosa PAO1. Infect Drug Resist 2019; 12:655-665. [PMID: 31114257 PMCID: PMC6497469 DOI: 10.2147/idr.s194462] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 02/16/2019] [Indexed: 12/12/2022] Open
Abstract
Background: As a central signaling molecule, cyclic diguanylate (c-di-GMP) is found to regulate various bacterial phenotypes, especially those involved in pathogen infection and drug resistance. Noticeably, many microbes have up to dozens of proteins that are involved in c-di-GMP metabolism. This apparent redundancy and the relevant functional specificity have become the focus of research. While a number of these proteins have been identified and investigated, the functions of PA0847, a PAS and GGDEF domain-containing protein from Pseudomonas aeruginosa PAO1, remain unclear. Materials and methods: In the current study, microbiology, biochemistry and structural biology methods were applied to characterize the gene/protein of PA0847. Results: We showed that PA0847 affects bacterial motility but not biofilm formation. We recorded the phenotypic influences of amino acids and compounds, and found that PA0847 is involved in response to various environmental nutrients and factors, suggesting its possible role in sensing environmental cues. Both in-vitro and in-vivo studies showed that PA0847 is an active diguanylate cyclase (DGC), whose activity depends on the neighboring PAS domain. Interestingly, PA0847 demonstrates no significant product inhibition, though the key residues of two I-sites for c-di-GMP binding are conserved in its GGDEF domain. A local structural change imposed by an adjacent tyrosine residue was identified, which indicates the structural and functional diversities of the GGDEF family proteins. Conclusion: Our data provide evidence for understanding the signaling mechanism of the unique c-di-GMP metabolizing protein PA0847.
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Affiliation(s)
- Yan Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Ningxia Medical University, Yinchuan750004, People’s Republic of China
- School of Life Sciences, Tianjin University, Tianjin300072, People’s Republic of China
| | - Jiayi Guo
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Ningxia Medical University, Yinchuan750004, People’s Republic of China
| | - Ning Zhang
- School of Life Sciences, Tianjin University, Tianjin300072, People’s Republic of China
| | - Wensu Yuan
- School of Life Sciences, Tianjin University, Tianjin300072, People’s Republic of China
| | - Zhi Lin
- School of Life Sciences, Tianjin University, Tianjin300072, People’s Republic of China
| | - Weidong Huang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Ningxia Medical University, Yinchuan750004, People’s Republic of China
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16
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Zhang Y, Xia B, Li M, Shi J, Long Y, Jin Y, Bai F, Cheng Z, Jin S, Wu W. HigB Reciprocally Controls Biofilm Formation and the Expression of Type III Secretion System Genes through Influencing the Intracellular c-di-GMP Level in Pseudomonas aeruginosa. Toxins (Basel) 2018; 10:toxins10110424. [PMID: 30355991 PMCID: PMC6265988 DOI: 10.3390/toxins10110424] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 10/21/2018] [Accepted: 10/22/2018] [Indexed: 11/16/2022] Open
Abstract
Toxin-antitoxin (TA) systems play important roles in bacteria persister formation. Increasing evidence demonstrate the roles of TA systems in regulating virulence factors in pathogenic bacteria. The toxin HigB in Pseudomonas aeruginosa contributes to persister formation and regulates the expression of multiple virulence factors and biofilm formation. However, the regulatory mechanism remains elusive. In this study, we explored the HigB mediated regulatory pathways. We demonstrate that HigB decreases the intracellular level of c-di-GMP, which is responsible for the increased expression of the type III secretion system (T3SS) genes and repression of biofilm formation. By analyzing the expression levels of the known c-di-GMP metabolism genes, we find that three c-di-GMP hydrolysis genes are up regulated by HigB, namely PA2133, PA2200 and PA3825. Deletion of the three genes individually or simultaneously diminishes the HigB mediated regulation on the expression of T3SS genes and biofilm formation. Therefore, our results reveal novel functions of HigB in P. aeruginosa.
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Affiliation(s)
- Yueying Zhang
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Bin Xia
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Mei Li
- Meishan Product Quality Supervision and Inspection Institute and National Pickle Quality Inspection Center, Meishan 620000, China.
| | - Jing Shi
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Yuqing Long
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Yongxin Jin
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Fang Bai
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Zhihui Cheng
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
| | - Shouguang Jin
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA.
| | - Weihui Wu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
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