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Schmitt BL, Leal BF, Leyser M, de Barros MP, Trentin DS, Ferreira CAS, de Oliveira SD. Increased ompW and ompA expression and higher virulence of Acinetobacter baumannii persister cells. BMC Microbiol 2023; 23:157. [PMID: 37246220 DOI: 10.1186/s12866-023-02904-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 05/19/2023] [Indexed: 05/30/2023] Open
Abstract
BACKGROUND Acinetobacter baumannii is one of the main causes of healthcare-associated infections that threaten public health, and carbapenems, such as meropenem, have been a therapeutic option for these infections. Therapeutic failure is mainly due to the antimicrobial resistance of A. baumannii, as well as the presence of persister cells. Persisters constitute a fraction of the bacterial population that present a transient phenotype capable of tolerating supra-lethal concentrations of antibiotics. Some proteins have been suggested to be involved in the onset and/or maintenance of this phenotype. Thus, we investigated the mRNA levels of the adeB (AdeABC efflux pump component), ompA, and ompW (outer membrane proteins) in A. baumannii cells before and after exposure to meropenem. RESULTS We found a significant increase (p-value < 0.05) in the expression of ompA (> 5.5-fold) and ompW (> 10.5-fold) in persisters. However, adeB did not show significantly different expression levels when comparing treated and untreated cells. Therefore, we suggest that these outer membrane proteins, especially OmpW, could be part of the mechanism of A. baumannii persisters to deal with the presence of high doses of meropenem. We also observed in the Galleria mellonella larvae model that persister cells are more virulent than regular ones, as evidenced by their LD50 values. CONCLUSIONS Taken together, these data contribute to the understanding of the phenotypic features of A. baumannii persisters and their relation to virulence, as well as highlight OmpW and OmpA as potential targets for drug development against A. baumannii persisters.
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Affiliation(s)
- Brenda Landvoigt Schmitt
- Laboratório de Imunologia e Microbiologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil
| | - Bruna Ferreira Leal
- Laboratório de Imunologia e Microbiologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil
| | - Mariana Leyser
- Laboratório de Imunologia e Microbiologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil
| | - Muriel Primon de Barros
- Laboratório de Bacteriologia e Modelos Experimentais Alternativos, Departamento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, UFCSPA, R. Sarmento Leite, 245, Porto Alegre, RS, 90050-170, Brazil
| | - Danielle Silva Trentin
- Laboratório de Bacteriologia e Modelos Experimentais Alternativos, Departamento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, UFCSPA, R. Sarmento Leite, 245, Porto Alegre, RS, 90050-170, Brazil
| | - Carlos Alexandre Sanchez Ferreira
- Laboratório de Imunologia e Microbiologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil.
- Programa de Pós-Graduação em Biologia Celular e Molecular, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil.
| | - Sílvia Dias de Oliveira
- Laboratório de Imunologia e Microbiologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil.
- Programa de Pós-Graduação em Biologia Celular e Molecular, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, Brazil.
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2
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An in silico reverse vaccinology study of Brachyspira pilosicoli, the causative organism of intestinal spirochaetosis, to identify putative vaccine candidates. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.08.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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ompX contribute to biofilm formation, osmotic response and swimming motility in Citrobacter werkmanii. Gene X 2022; 851:147019. [DOI: 10.1016/j.gene.2022.147019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 10/12/2022] [Accepted: 10/25/2022] [Indexed: 11/04/2022] Open
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Abstract
The DNA-binding protein from starved cells, Dps, is a universally conserved prokaryotic ferritin that, in many species, also binds DNA. Dps homologs have been identified in the vast majority of bacterial species and several archaea. Dps also may play a role in the global regulation of gene expression, likely through chromatin reorganization. Dps has been shown to use both its ferritin and DNA-binding functions to respond to a variety of environmental pressures, including oxidative stress. One mechanism that allows Dps to achieve this is through a global nucleoid restructuring event during stationary phase, resulting in a compact, hexacrystalline nucleoprotein complex called the biocrystal that occludes damaging agents from DNA. Due to its small size, hollow spherical structure, and high stability, Dps is being developed for applications in biotechnology.
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Cai Q, Wang G, Li Z, Zhang L, Fu Y, Yang X, Lin W, Lin X. SWATH based quantitative proteomics analysis reveals Hfq2 play an important role on pleiotropic physiological functions in Aeromonas hydrophila. J Proteomics 2019; 195:1-10. [DOI: 10.1016/j.jprot.2018.12.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 12/15/2018] [Accepted: 12/26/2018] [Indexed: 12/14/2022]
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6
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Pavan ME, Venero ES, Egoburo DE, Pavan EE, López NI, Julia Pettinari M. Glycerol inhibition of melanin biosynthesis in the environmental Aeromonas salmonicida 34mel T. Appl Microbiol Biotechnol 2018; 103:1865-1876. [PMID: 30539256 DOI: 10.1007/s00253-018-9545-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 11/20/2018] [Accepted: 11/27/2018] [Indexed: 02/06/2023]
Abstract
The environmental strain Aeromonas salmonicida subsp. pectinolytica 34melT produces abundant melanin through the homogentisate pathway in several culture media, but unexpectedly not when grown in a medium containing glycerol. Using this observation as a starting point, this study investigated the underlying causes of the inhibition of melanin synthesis by glycerol, to shed light on factors that affect melanin production in this microorganism. The effect of different carbon sources on melanin formation was related to the degree of oxidation of their C atoms, as the more reduced substrates delayed melanization more than the more oxidized ones, although only glycerol completely abolished melanin production. Glyphosate, an inhibitor of aromatic amino acid synthesis, did not affect melanization, while bicyclopyrone, an inhibitor of 4-hydroxyphenylpyruvate dioxygenase (Hpd), the enzyme responsible for the synthesis of homogentisate, prevented melanin synthesis. These results showed that melanin production in 34melT depends on the degradation of aromatic amino acids from the growth medium and not on de novo aromatic amino acid synthesis. The presence of glycerol changed the secreted protein profile, but none of the proteins affected could be directly connected with melanin synthesis or transport. Transcription analysis of hpd, encoding the key enzyme for melanin synthesis, showed a clear inhibition caused by glycerol. The results obtained in this work indicate that a significant decrease in the transcription of hpd, together with a more reduced intracellular state, would lead to the abolishment of melanin synthesis observed. The effect of glycerol on melanization can thus be attributed to a combination of metabolic and regulatory effects.
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Affiliation(s)
- María Elisa Pavan
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Esmeralda Solar Venero
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.,IQUIBICEN-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Diego E Egoburo
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.,IQUIBICEN-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Esteban E Pavan
- Biomedical Technologies Laboratory, Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milan, Italy
| | - Nancy I López
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina. .,IQUIBICEN-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
| | - M Julia Pettinari
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina. .,IQUIBICEN-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
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7
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Chourabi K, Campoy S, Rodriguez JA, Kloula S, Landoulsi A, Chatti A. UV-C Adaptation of Shigella: Morphological, Outer Membrane Proteins, Secreted Proteins, and Lipopolysaccharides Effects. Curr Microbiol 2017; 74:1261-1269. [PMID: 28744569 DOI: 10.1007/s00284-017-1311-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 07/14/2017] [Indexed: 11/29/2022]
Abstract
Water UV disinfection remains extremely important, particularly in developing countries where drinking and reclaimed crop irrigation water may spread devastating infectious diseases. Enteric bacterial pathogens, among which Shigella, are possible contaminants of drinking and bathing water and foods. To study the effect of UV light on Shigella, four strains were exposed to different doses in a laboratory-made irradiation device, given that the ultraviolet radiation degree of inactivation is directly related to the UV dose applied to water. Our results showed that the UV-C rays are effective against all the tested Shigella strains. However, UV-C doses appeared as determinant factors for Shigella eradication. On the other hand, Shigella-survived strains changed their outer membrane protein profiles, secreted proteins, and lipopolysaccharides. Also, as shown by electron microscopy transmission, morphological alterations were manifested by an internal cytoplasm disorganized and membrane envelope breaks. Taken together, the focus of interest of our study is to know the adaptive mechanism of UV-C resistance of Shigella strains.
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Affiliation(s)
- Kalthoum Chourabi
- Laboratory of Wastewater Treatment and Valorization, Water Research and Technology Centre, Technopole of Borj-Cédria, BP 273, Soliman, 8020, Tunisia.
| | - Susana Campoy
- Department of Genetics and Microbiology, Autonomous University of Barcelona, 08290, Barcelona, Spain
| | - Jesus A Rodriguez
- Department of Genetics and Microbiology, Autonomous University of Barcelona, 08290, Barcelona, Spain
| | - Salma Kloula
- Laboratory of Wastewater Treatment and Valorization, Water Research and Technology Centre, Technopole of Borj-Cédria, BP 273, Soliman, 8020, Tunisia
| | - Ahmed Landoulsi
- Laboratory of Biochemistry and Molecular Biology, Faculty of Sciences of Bizerte, Carthage University, Zarzouna, 7021, Tunisia
| | - Abdelwaheb Chatti
- Laboratory of Wastewater Treatment and Valorization, Water Research and Technology Centre, Technopole of Borj-Cédria, BP 273, Soliman, 8020, Tunisia
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8
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Hassard F, Gwyther CL, Farkas K, Andrews A, Jones V, Cox B, Brett H, Jones DL, McDonald JE, Malham SK. Abundance and Distribution of Enteric Bacteria and Viruses in Coastal and Estuarine Sediments-a Review. Front Microbiol 2016; 7:1692. [PMID: 27847499 PMCID: PMC5088438 DOI: 10.3389/fmicb.2016.01692] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 10/10/2016] [Indexed: 11/26/2022] Open
Abstract
The long term survival of fecal indicator organisms (FIOs) and human pathogenic microorganisms in sediments is important from a water quality, human health and ecological perspective. Typically, both bacteria and viruses strongly associate with particulate matter present in freshwater, estuarine and marine environments. This association tends to be stronger in finer textured sediments and is strongly influenced by the type and quantity of clay minerals and organic matter present. Binding to particle surfaces promotes the persistence of bacteria in the environment by offering physical and chemical protection from biotic and abiotic stresses. How bacterial and viral viability and pathogenicity is influenced by surface attachment requires further study. Typically, long-term association with surfaces including sediments induces bacteria to enter a viable-but-non-culturable (VBNC) state. Inherent methodological challenges of quantifying VBNC bacteria may lead to the frequent under-reporting of their abundance in sediments. The implications of this in a quantitative risk assessment context remain unclear. Similarly, sediments can harbor significant amounts of enteric viruses, however, the factors regulating their persistence remains poorly understood. Quantification of viruses in sediment remains problematic due to our poor ability to recover intact viral particles from sediment surfaces (typically <10%), our inability to distinguish between infective and damaged (non-infective) viral particles, aggregation of viral particles, and inhibition during qPCR. This suggests that the true viral titre in sediments may be being vastly underestimated. In turn, this is limiting our ability to understand the fate and transport of viruses in sediments. Model systems (e.g., human cell culture) are also lacking for some key viruses, preventing our ability to evaluate the infectivity of viruses recovered from sediments (e.g., norovirus). The release of particle-bound bacteria and viruses into the water column during sediment resuspension also represents a risk to water quality. In conclusion, our poor process level understanding of viral/bacterial-sediment interactions combined with methodological challenges is limiting the accurate source apportionment and quantitative microbial risk assessment for pathogenic organisms associated with sediments in aquatic environments.
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Affiliation(s)
| | - Ceri L. Gwyther
- Department of Engineering and Innovation, Open UniversityMilton Keynes, UK
| | - Kata Farkas
- School of Environment, Natural Resources and Geography, Bangor UniversityBangor, UK
| | | | | | | | | | - Davey L. Jones
- School of Environment, Natural Resources and Geography, Bangor UniversityBangor, UK
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9
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Catel-Ferreira M, Marti S, Guillon L, Jara L, Coadou G, Molle V, Bouffartigues E, Bou G, Shalk I, Jouenne T, Vila-Farrés X, Dé E. The outer membrane porin OmpW of Acinetobacter baumannii is involved in iron uptake and colistin binding. FEBS Lett 2016; 590:224-31. [PMID: 26823169 DOI: 10.1002/1873-3468.12050] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 12/10/2015] [Indexed: 11/07/2022]
Abstract
This study was undertaken to characterize functions of the outer membrane protein OmpW, which potentially contributes to the development of colistin- and imipenem-resistance in Acinetobacter baumannii. Reconstitution of OmpW in artificial lipid bilayers showed that it forms small channels (23 pS in 1 m KCl) and markedly interacts with iron and colistin, but not with imipenem. In vivo, (55) Fe uptake assays comparing the behaviours of ΔompW mutant and wild-type strains confirmed a role for OmpW in A. baumannii iron homeostasis. However, the loss of OmpW expression did not have an impact on A. baumannii susceptibilities to colistin or imipenem.
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Affiliation(s)
- Manuella Catel-Ferreira
- CNRS UMR 6270 & FR3038, Normandie Univ, Laboratoire Polymères, Biopolymères & Surfaces, Université de Rouen, Mont Saint Aignan, France
| | - Sara Marti
- CNRS UMR 6270 & FR3038, Normandie Univ, Laboratoire Polymères, Biopolymères & Surfaces, Université de Rouen, Mont Saint Aignan, France.,Center for International Health Research, CRESIB, Hospital Clínic, University of Barcelona, Spain
| | - Laurent Guillon
- UMR 7242, Université de Strasbourg-CNRS, ESBS, Illkirch, France
| | - Luis Jara
- Departament de Genètica i Microbiologia, Facultat de Biociències, Universitat Autònoma de Barcelona, Spain
| | - Gaël Coadou
- COBRA-CNRS, Laboratoire de RMN et Modélisation moléculaire, UMR 6014 & FR3038 CNRS, Université de Rouen, Mont Saint Aignan, France
| | - Virginie Molle
- Laboratoire de Dynamique des Interactions Membranaires Normales et Pathologiques, Universités de Montpellier II et I, CNRS; UMR 5235, Montpellier Cedex 05, France
| | - Emeline Bouffartigues
- Laboratoire de Microbiologie Signaux et Micro-Environnement (LMSM) EA 4312, Université de Rouen, Evreux, France
| | - German Bou
- Servicio de Microbiología-INIBIC, Complejo Hospitalario Universitario A Coruña (CHUAC), Spain
| | - Isabelle Shalk
- UMR 7242, Université de Strasbourg-CNRS, ESBS, Illkirch, France
| | - Thierry Jouenne
- CNRS UMR 6270 & FR3038, Normandie Univ, Laboratoire Polymères, Biopolymères & Surfaces, Université de Rouen, Mont Saint Aignan, France
| | - Xavier Vila-Farrés
- Center for International Health Research, CRESIB, Hospital Clínic, University of Barcelona, Spain
| | - Emmanuelle Dé
- CNRS UMR 6270 & FR3038, Normandie Univ, Laboratoire Polymères, Biopolymères & Surfaces, Université de Rouen, Mont Saint Aignan, France
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10
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Huang X, Chen M, Lu X, Li Y, Li X, Li JJ. Direct production of itaconic acid from liquefied corn starch by genetically engineered Aspergillus terreus. Microb Cell Fact 2014; 13:108. [PMID: 25162619 PMCID: PMC4145239 DOI: 10.1186/s12934-014-0108-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 07/22/2014] [Indexed: 01/01/2023] Open
Abstract
Background Itaconic acid is on the DOE (Department of Energy) top 12 list of biotechnologically produced building block chemicals and is produced commercially by Aspergillus terreus. However, the production cost of itaconic acid is too high to be economically competitive with the petrochemical-based products. Itaconic acid is generally produced from raw corn starch, including three steps: enzymatic hydrolysis of corn starch into a glucose-rich syrup by α-amylase and glucoamylase, fermentation, and recovery of itaconic acid. The whole process is very time-consuming and energy-intensive. Results In order to reduce the production cost, saccharification and fermentation were integrated into one step through overexpressing the glucoamylase gene in A. terreus under the control of the native PcitA promoter. The transformant XH61-5 produced higher itaconate titer from liquefied starch than WT. To further increase the titer by enhancing the secretion capacity of overexpressed glucoamylase, a stronger signal peptide was selected based on the major secreted protein ATEG_02176 (an acid phosphatase precursor) by A. terreus under the itaconate production conditions. Under the control of the stronger signal peptide, the transformant XH86-8 showed higher itaconate production level than XH61-5 from liquefied starch. The itaconate titer was further enhanced through a two-step process involving the vegetative and production phase, and the transformant XH86-8 produced comparable itaconate titer from liquefied starch to current one (~80 g/L) from saccharified starch hydrolysates in industry. The effects of the new signal peptide and the two-step process on itaconate production were investigated and discussed. Conclusions Itaconic acid could be efficiently produced from liquefied corn starch by overexpressing the glucoamylase gene in A. terreus, which will be helpful for constructing a highly efficient microbial cell factory for itaconate production and for further lowering the production cost of itaconic acid. Electronic supplementary material The online version of this article (doi:10.1186/s12934-014-0108-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | | | - Jian-Jun Li
- Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No, 189 Songling Road, Qingdao 266101, China.
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11
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Brambilla L, Morán-Barrio J, Viale AM. Expression of the Escherichia coli ompW colicin S4 receptor gene is regulated by temperature and modulated by the H-NS and StpA nucleoid-associated proteins. FEMS Microbiol Lett 2014; 352:238-44. [PMID: 24444297 DOI: 10.1111/1574-6968.12385] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 01/09/2014] [Accepted: 01/13/2014] [Indexed: 12/15/2022] Open
Abstract
The OmpW family consists of a ubiquitous group of small outer membrane (OM) β-barrel proteins of Gram-negative bacteria with proposed roles in environmental adaptation but poorly understood mechanisms of expression. We report here that Escherichia coli K-12 OmpW contents are drastically modified by temperature changes compatible with the leap from the environment to warm-blooded hosts and/or vice versa. Thus, while OmpW is present in the OM of bacteria grown at 37 °C, it sharply disappears at 23 °C with the concomitant acquisition of colicin S4 resistance by the cells. ompW::lacZY fusions indicated that temperature regulation operates at the level of transcription, being ompW expression almost abolished at 23 °C as compared to 37 °C. Moreover, E. coli Δhns mutants lacking H-NS showed reductions in ompW transcription and OmpW contents at 37 °C, indicating positive modulatory roles for this nucleoid-structuring protein in ompW expression. Also, ΔhnsΔstpA double mutants simultaneously lacking H-NS and its paralog StpA showed more severe reductions in ompW expression at 37 °C, resulting in the complete loss of OmpW. The overall results indicate that OmpW contents in E. coli are regulated by both temperature and H-NS and reinforce OmpW functions in bacterial adaptation to warm-blooded hosts.
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Affiliation(s)
- Luciano Brambilla
- Instituto de Biología Molecular y Celular de Rosario (IBR, CONICET) and Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Rosario, Argentina
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12
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Lee H, Park SJ, Han MJ, Eom GT, Choi MJ, Kim SH, Oh YH, Song BK, Lee SH. Expression of a lipase on the cell-surface of Escherichia coli using the OmpW anchoring motif and its application to enantioselective reactions. Biotechnol Lett 2013; 35:1677-83. [PMID: 23881313 DOI: 10.1007/s10529-013-1260-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 05/29/2013] [Indexed: 12/11/2022]
Abstract
Microbial-surface display is the expression of proteins or peptides on the surface of cells by fusing an appropriate protein as an anchoring motif. Here, the outer membrane protein W (OmpW) was selected as a fusion partner for functional expression of Pseudomonas fluorescence SIK W1 lipase (TliA) on the cell-surface of Escherichia coli. Localization of the truncated OmpW-TliA fusion protein on the cell-surface was confirmed by immunoblotting and functional assay of lipase activity. Enantioselective hydrolysis of rac-phenylethyl butanoate by the displayed lipase resulted in optically active (R)-phenyl ethanol with 96% enantiomeric excess and 44% of conversion in 5 days. Thus, a small outer membrane protein OmpW, is a useful anchoring motif for displaying an active enzyme of ~50 kDa on the cell-surface and the surface-displayed lipase can be employed as an enantioselective biocatalyst in organic synthesis.
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Affiliation(s)
- Hyuk Lee
- Division of Drug Discovery Research, Korea Research Institute of Chemical Technology, P.O. Box 107, 141 Gajeong-ro, Yuseong-gu, Daejeon, 305-600, Republic of Korea,
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13
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Cao B, Liu J, Qin G, Tian S. Oxidative Stress Acts on Special Membrane Proteins To Reduce the Viability of Pseudomonas syringae pv tomato. J Proteome Res 2012; 11:4927-38. [DOI: 10.1021/pr300446g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Baohua Cao
- Key Laboratory of Plant Resources,
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Graduate School of the Chinese Academy of Sciences, Beijing 100039,
China
| | - Jia Liu
- Key Laboratory of Plant Resources,
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Graduate School of the Chinese Academy of Sciences, Beijing 100039,
China
| | - Guozheng Qin
- Key Laboratory of Plant Resources,
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Shiping Tian
- Key Laboratory of Plant Resources,
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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Schliep M, Ryall B, Ferenci T. The identification of global patterns and unique signatures of proteins across 14 environments using outer membrane proteomics of bacteria. MOLECULAR BIOSYSTEMS 2012; 8:3017-27. [PMID: 22956018 DOI: 10.1039/c2mb25212k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We test the hypothesis that organisms sourced from different environments exhibit unique fingerprints in macromolecular composition. Experimentally, we followed proteomic changes with 14 different sub-lethal environmental stimuli in Escherichia coli at controlled growth rates. The focus was on the outer membrane sub-proteome, which is known to be extremely sensitive to environmental controls. The analyses surprisingly revealed that pairs of proteins belonging to very different regulons, such as Slp and OmpX or FadL and OmpF, have the closest patterns of change with the 14 conditions. Fe-limited and cold-cultured bacteria have the most distinct global patterns of spot changes, but the patterns with fast growth and oxygen limitation are the closest amongst the 14 environments. These unexpected but statistically robust results suggest that we have an incomplete picture of bacterial regulation across different stress responses; baseline choices and growth-rate influences are probably underestimated factors in such systems-level analysis. In terms of our aim of getting a unique profile for each of the 14 investigated environments, we find that it is unnecessary to compare all the proteins in a proteome and that a panel of five proteins is sufficient for identification of environmental fingerprints. This demonstrates the future feasibility of tracing the history of contaminating bacteria in hospitals, foods or industrial settings as well as for released organisms and biosecurity purposes.
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Affiliation(s)
- Martin Schliep
- School of Molecular Bioscience, University of Sydney, Camperdown NSW 2006, Australia
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Walczak JJ, Wang L, Bardy SL, Feriancikova L, Li J, Xu S. The effects of starvation on the transport of Escherichia coli in saturated porous media are dependent on pH and ionic strength. Colloids Surf B Biointerfaces 2011; 90:129-36. [PMID: 22019454 DOI: 10.1016/j.colsurfb.2011.10.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 09/26/2011] [Accepted: 10/06/2011] [Indexed: 11/15/2022]
Abstract
In this research, we investigate the effects of starvation on the transport of Escherichia coli K12 in saturated porous media. Particularly, we examine the relationship between the starvation effects and the pH and ionic strength of the electrolyte solutions used for cell starvation. E. coli K12 was cultured using either Luria-Bertani Miller (LB-Miller) broth, which contained 10 g/L of NaCl, or LB-Luria broth, which contained 0.5 g/L of NaCl. As both types of broths had similar pH (~7.2) they differed in ionic strengths. The bacterial cells were harvested at late-exponential phase and resuspended in buffered (pH=7.2) and non-buffered (pH=5.7) electrolyte solutions that had ionic strengths of 8.4mM or 168 mM, respectively. Column transport experiments were performed following 4, 25 and 52 h of cell starvation to evaluate the temporal changes in cell mobility. Our results showed that starvation led to a significant increase in the mobility of E. coli K12, particularly between 4 and 25 h, when both pH and ionic strength of the electrolyte solution were different from those of the growth media. The size, viability and surface properties (e.g., zeta potential, hydrophobicity, LPS sugar content, outer membrane protein profiles) of the bacterial cells were determined and related to the observed temporal variation patterns of cell mobility. We found that starvation in electrolyte solutions that had different pH and ionic strength from the growth media significantly lowered cell viability, which may be related to the temporal change in cell mobility under these specific conditions.
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Affiliation(s)
- Jacob J Walczak
- Department of Geosciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, United States
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Goulter-Thorsen RM, Gentle IR, Gobius KS, Dykes GA. The DNA protection during starvation protein (Dps) influences attachment of Escherichia coli to abiotic surfaces. Foodborne Pathog Dis 2011; 8:939-41. [PMID: 21438764 DOI: 10.1089/fpd.2011.0837] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
The attachment of bacterial species such as Escherichia coli to abiotic materials is of concern to the food industry. This study investigated the role of DNA protection during starvation protein (Dps) in cell surface hydrophobicity and attachment of E. coli to glass, stainless steel, and Teflon surfaces. The Dps was not found to influence hydrophobicity, but did have a putative role in attachment in a strain- and substrate-dependent manner.
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Zhang DF, Li H, Lin XM, Wang SY, Peng XX. Characterization of Outer Membrane Proteins of Escherichia Coli in Response to Phenol Stress. Curr Microbiol 2010; 62:777-83. [DOI: 10.1007/s00284-010-9786-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Accepted: 09/22/2010] [Indexed: 01/22/2023]
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Parry-Hanson AA, Jooste PJ, Buys EM. Relative gene expression in acid-adapted Escherichia coli O157:H7 during lactoperoxidase and lactic acid challenge in Tryptone Soy Broth. Microbiol Res 2010; 165:546-56. [DOI: 10.1016/j.micres.2009.11.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2009] [Revised: 11/02/2009] [Accepted: 11/07/2009] [Indexed: 11/24/2022]
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Lin XM, Yang JN, Peng XX, Li H. A Novel Negative Regulation Mechanism of Bacterial Outer Membrane Proteins in Response to Antibiotic Resistance. J Proteome Res 2010; 9:5952-9. [DOI: 10.1021/pr100740w] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Xiang-Min Lin
- Center for Proteomics, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, University City, Guangzhou 510006, People’s Republic of China
| | - Jun-Ning Yang
- Center for Proteomics, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, University City, Guangzhou 510006, People’s Republic of China
| | - Xuan-Xian Peng
- Center for Proteomics, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, University City, Guangzhou 510006, People’s Republic of China
| | - Hui Li
- Center for Proteomics, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, University City, Guangzhou 510006, People’s Republic of China
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Shiloach J, Reshamwala S, Noronha SB, Negrete A. Analyzing metabolic variations in different bacterial strains, historical perspectives and current trends – example E. coli. Curr Opin Biotechnol 2010; 21:21-6. [DOI: 10.1016/j.copbio.2010.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 01/06/2010] [Indexed: 10/19/2022]
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Bouchal P, Struhárová I, Budinská E, Sedo O, Vyhlídalová T, Zdráhal Z, van Spanning R, Kucera I. Unraveling an FNR based regulatory circuit in Paracoccus denitrificans using a proteomics-based approach. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1804:1350-8. [PMID: 20116460 DOI: 10.1016/j.bbapap.2010.01.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2009] [Revised: 01/05/2010] [Accepted: 01/21/2010] [Indexed: 10/19/2022]
Abstract
The switch from aerobic to anaerobic respiration in the bacterium Paracoccus denitrificans is orchestrated by the action of three FNR-type transcription regulators FnrP, NNR and NarR, which are sensors for oxygen, nitric oxide and nitrite, respectively. In this work, we analyzed the protein composition of four strains (wild type, FnrP-, NNR- and NarR-mutant strains) grown aerobically, semiaerobically and semiaerobically in the presence of nitrate to discover the global role of FNR-family transcription regulators using proteomics, with data validation at the transcript and genome levels. Expression profiles were acquired using two-dimensional gel electrophoresis for 737 protein spots, in which 640 proteins were identified using mass spectrometry. The annotated 2-D proteome map provided the most comprehensive coverage of P. denitrificans proteome available to-date and can be accessed on-line at http://www.mpiib-berlin.mpg.de/2D-PAGE/. Our results revealed several types of regulation under the conditions tested: (1) FnrP-controlled regulation of nitrous oxide reductase, UspA and OmpW as confirmed at protein, transcript and DNA level (position of FNR boxes). (2) Proteins regulated via additional regulators, including proteins involved in NNR and NarR regulons: nitrate reductase beta-subunit, TonB-dependent receptors, nitrite reductase, a TenA-type transcription regulator, and an unknown protein with an alpha/beta hydrolase fold. (3) Proteins whose expression was affected mainly by the growth condition. This group contains SSU ribosomal protein S305 / sigma(54) modulation protein, and two short-chain reductase-dehydrogenase proteins.
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Affiliation(s)
- Pavel Bouchal
- Department of Biochemistry, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic.
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Villa R, Lotti M, Gatti-Lafranconi P. Components of the E. coli envelope are affected by and can react to protein over-production in the cytoplasm. Microb Cell Fact 2009; 8:32. [PMID: 19500339 PMCID: PMC2701923 DOI: 10.1186/1475-2859-8-32] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2009] [Accepted: 06/05/2009] [Indexed: 11/30/2022] Open
Abstract
Background Protein over-expression in bacteria is still the easiest, cheapest and therefore preferred way to obtain large amounts of proteins for industrial and laboratory scale preparations. Several studies emphasized the importance of understanding cellular and molecular mechanisms triggered by protein over-production in order to obtain higher yield and better quality of the recombinant product. Almost every step leading to a fully functional polypeptide has been investigated, from mRNA stability to the role of molecular chaperones, from aggregation to bottlenecks in the secretory pathway. In this context, we focused on the still poorly addressed relationship between protein production in the cytoplasm and the bacterial envelope, an active and reactive cell compartment that controls interactions with the environment and several major cellular processes. Results available to date show that the accumulation of foreign proteins in the cytoplasm induces changes in the membrane lipids and in the levels of mRNAs for some membrane proteins. However, a direct connection between membrane protein expression levels and soluble/aggregated protein accumulation in the cytoplasm has never been reported. Results By the use of a combined physiological and proteomic approach, we investigated the effects on the cell membrane of E. coli of the overexpression of two recombinant proteins, the B. cepacia lipase (BCL) and the green fluorescent protein (GFP). Both polypeptides are expressed in the cytoplasm at similar levels but GFP is fully soluble whereas inactive BCL accumulates in inclusion bodies. Growth and viability of the transformed cells were tested in the presence of different drugs. We found that chloramphenycol preferentially inhibited the strain over-producing GFP while SDS was more effective when BCL inclusion bodies accumulated in the cytoplasm. In contrast, both proteins induced a similar response in the membrane proteome, i.e. increased levels of LamB, OmpF, OmpA and TolC. Under all tested conditions, the lipopolysaccharide was not affected, suggesting that a specific rather than a generalized rearrangement of the envelope was induced. Conclusion Taking together physiological and biochemical evidence, our work indicates that the E. coli envelope can sense protein over-expression in the cytoplasm and react by modulating the abundance of some membrane proteins, with possible consequences on the membrane traffic of small solutes, i.e. nutrients, drugs and metabolites. Such a response seems to be independent on the nature of the protein being over-expressed. On the other hand both our data reported herein and previous results indicate that membrane lipids may act as a second stress sensor responsive to the aggregation state of the recombinant protein and further contribute to changes in cellular exchanges with the environment.
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Affiliation(s)
- Riccardo Villa
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, Milano, Italy.
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