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Keltsch NG, Gazanis A, Dietrich C, Wick A, Heermann R, Tremel W, Ternes TA. Development of an analytical method to quantify N-acyl-homoserine lactones in bacterial cultures, river water, and treated wastewater. Anal Bioanal Chem 2024; 416:3555-3567. [PMID: 38703199 DOI: 10.1007/s00216-024-05306-9] [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: 01/02/2024] [Revised: 03/15/2024] [Accepted: 04/11/2024] [Indexed: 05/06/2024]
Abstract
N-Acyl-homoserine lactones (AHL) play a major role in the communication of Gram-negative bacteria. They influence processes such as biofilm formation, swarming motility, and bioluminescence in the aquatic environment. A comprehensive analytical method was developed to elucidate the "chemical communication" in pure bacterial cultures as well as in the aquatic environment and engineered environments with biofilms. Due to the high diversity of AHLs and their low concentrations in water, a sensitive and selective LC-ESI-MS/MS method combined with solid-phase extraction was developed for 34 AHLs, optimized and validated to quantify AHLs in bacterial conditioned medium, river water, and treated wastewater. Furthermore, the developed method was optimized in terms of enrichment volume, internal standards, limits of detection, and limits of quantification in several matrices. An unanticipated variety of AHLs was detected in the culture media of Pseudomonas aeruginosa (in total 8 AHLs), Phaeobacter gallaeciensis (in total 6 AHLs), and Methylobacterium mesophilicum (in total 15 AHLs), which to our knowledge have not been described for these bacterial cultures so far. Furthermore, AHLs were detected in river water (in total 5 AHLs) and treated wastewater (in total 3 AHLs). Several detected AHLs were quantified (in total 24) using a standard addition method up to 7.3±1.0 µg/L 3-Oxo-C12-AHL (culture media of P. aeruginosa).
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Affiliation(s)
- N G Keltsch
- Bundesanstalt für Gewässerkunde, Am Mainzer Tor 1, Koblenz, 56068, Germany
- Universität Koblenz-Landau, Universitätsstraße 1, Koblenz, 56070, Germany
| | - A Gazanis
- Biozentrum II, Institut für Molekulare Physiologie, Mikrobiologie und Biotechnologie, Johannes Gutenberg-Universität Mainz, Hanns-Dieter-Hüsch-Weg 17, Mainz, 55128, Germany
| | - C Dietrich
- Bundesanstalt für Gewässerkunde, Am Mainzer Tor 1, Koblenz, 56068, Germany
| | - A Wick
- Bundesanstalt für Gewässerkunde, Am Mainzer Tor 1, Koblenz, 56068, Germany
| | - R Heermann
- Biozentrum II, Institut für Molekulare Physiologie, Mikrobiologie und Biotechnologie, Johannes Gutenberg-Universität Mainz, Hanns-Dieter-Hüsch-Weg 17, Mainz, 55128, Germany
| | - W Tremel
- Department of Chemistry, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, Mainz, 55099, Germany
| | - T A Ternes
- Bundesanstalt für Gewässerkunde, Am Mainzer Tor 1, Koblenz, 56068, Germany.
- Universität Koblenz-Landau, Universitätsstraße 1, Koblenz, 56070, Germany.
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Diaz Perez A, Pysz PM, Usdrowski H, Hunter VK, Stenken JA. Attachment and optimization of Staphylococcus aureus, Staphylococcus epidermidis, and Pseudomonas aeruginosa biofilms to a 3D printed lattice. J Microbiol Methods 2023; 204:106644. [PMID: 36481431 DOI: 10.1016/j.mimet.2022.106644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022]
Abstract
A lattice was designed and fabricated using three-dimensional (3D) printing that allows for the facile transfer of biofilms formed from either Staphylococcus aureus, Staphylococcus epidermidis, or Pseudomonas aeruginosa into a fresh cell culture flask. To enhance biofilm production onto the filaments, three protein-based treatments were compared: fetal bovine serum (FBS), bovine serum albumin (BSA), and fibrinogen (Fb). Protein treatments included either supplementing the growth broths or pre-coating the lattice prior to immersion into the broth. S. aureus and P. aeruginosa biofilms were observed on all tested filaments that contained the supplement Fb. S. epidermidis required BSA to form biofilm. Ultimately, polycarbonate (PC) was chosen as the optimal material for lattice creation since it can be autoclaved without warping key design features. In addition, this 3D printed design may facilitate biofilm transfer from the bacterial culture to different cell culture platforms.
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Affiliation(s)
- Alda Diaz Perez
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, United States
| | - Patrick M Pysz
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, United States
| | - Hunter Usdrowski
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, United States
| | - Victoria K Hunter
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, United States
| | - Julie A Stenken
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, United States.
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Hosny RA, Fadel MA. Detection of Quorum Sensing N-Acyl-Homoserine Lactone Molecules Produced by Different Resistant Klebsiella pneumoniae Isolates Recovered from Poultry and Different Environmental Niches. Appl Biochem Biotechnol 2021; 193:3351-3370. [PMID: 34196919 DOI: 10.1007/s12010-021-03605-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 06/21/2021] [Indexed: 10/21/2022]
Abstract
This study aimed to detect and identify the N-acyl-homoserine lactones molecules (AHLs) produced by different resistant Klebsiella pneumoniae isolates recovered from poultry and environmental samples using a modified validated high-performance liquid chromatography method. A total of 56 K. pneumoniae isolates were recovered, investigated for their antibiotic susceptibility, and screened for AHLs production using the Agrobacterium tumefaciens NTL4 biosensor system and a validated high-performance liquid chromatography method. The results revealed the detection of different short- and long-chain AHLs molecules among 39 K. pneumoniae isolates recovered from poultry and environmental samples. All environmental isolates produced nine peaks with retention times for C4-HSL, C6-HSL, C12-HSL, C8-HSL, C14-HSL, C8-oxo-HSL, C10-HSL, C6-oxo-HSL, and C7-HSL. The most quantifiable AHL signal molecules in poultry isolates were C4-HSL, C6-HSL, and C12-HSL. No statistical correlation between the AHL-producing ability of K. pneumoniae isolates and antibiotic resistance was reported. To the best of our knowledge, this study provides the first detailed report on the detection and identification of AHLs in K. pneumoniae isolates recovered from poultry and environmental samples. Furthermore, it provides a new insight available tool other than LC-MS/MS for detection and identification of AHL molecules.
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Affiliation(s)
- Reham A Hosny
- Reference Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt.
| | - Mai A Fadel
- Pharmacology and Pyrogen Unit, Department of Chemistry, Toxicology and Feed Deficiency, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt
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Bazhenov S, Novoyatlova U, Scheglova E, Fomin V, Khrulnova S, Melkina O, Chistyakov V, Manukhov I. Influence of the luxR Regulatory Gene Dosage and Expression Level on the Sensitivity of the Whole-Cell Biosensor to Acyl-Homoserine Lactone. BIOSENSORS-BASEL 2021; 11:bios11060166. [PMID: 34071046 PMCID: PMC8224577 DOI: 10.3390/bios11060166] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/16/2021] [Accepted: 05/20/2021] [Indexed: 12/11/2022]
Abstract
Aliivibrio fischeri LuxR and Aliivibrio logei LuxR1 and LuxR2 regulatory proteins are quorum sensing transcriptional (QS) activators, inducing promoters of luxICDABEG genes in the presence of an autoinducer (3-oxo-hexanoyl-l-homoserine lactone). In the Aliivibrio cells, luxR genes are regulated by HNS, CRP, LitR, etc. Here we investigated the role of the luxR expression level in LuxI/R QS system functionality and improved the whole-cell biosensor for autoinducer detection. Escherichia coli-based bacterial lux-biosensors were used, in which Photorhabdus luminescensluxCDABE genes were controlled by LuxR-dependent promoters and luxR, luxR1, or luxR2 regulatory genes. We varied either the dosage of the regulatory gene in the cells using additional plasmids, or the level of the regulatory gene expression using the lactose operon promoter. It was shown that an increase in expression level, as well as dosage of the regulatory gene in biosensor cells, leads to an increase in sensitivity (the threshold concentration of AI is reduced by one order of magnitude) and to a two to threefold reduction in response time. The best parameters were obtained for a biosensor with an increased dosage of luxRA. fischeri (sensitivity to 3-oxo-hexanoyl-l-homoserine lactone reached 30–100 pM).
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Affiliation(s)
- Sergey Bazhenov
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
- Academy of Biology and Biotechnology, Southern Federal University, 344022 Rostov-on-Don, Russia;
- Faculty of Physics, HSE University, 109028 Moscow, Russia
- Correspondence:
| | - Uliana Novoyatlova
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
| | - Ekaterina Scheglova
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
| | - Vadim Fomin
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
| | - Svetlana Khrulnova
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
- National Research Center for Hematology, 125167 Moscow, Russia
| | - Olga Melkina
- State Research Institute of Genetics and Selection of Industrial Microorganisms of the National Research Center “Kurchatov Institute”, 117545 Moscow, Russia;
| | - Vladimir Chistyakov
- Academy of Biology and Biotechnology, Southern Federal University, 344022 Rostov-on-Don, Russia;
| | - Ilya Manukhov
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (U.N.); (E.S.); (V.F.); (S.K.); (I.M.)
- Faculty of Physics, HSE University, 109028 Moscow, Russia
- Federal Research Center of Biological Systems and Agro-technologies of RAS, 460000 Orenburg, Russia
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Biological and clinical significance of quorum sensing alkylquinolones: current analytical and bioanalytical methods for their quantification. Anal Bioanal Chem 2021; 413:4599-4618. [PMID: 33959788 DOI: 10.1007/s00216-021-03356-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/21/2021] [Accepted: 04/16/2021] [Indexed: 12/27/2022]
Abstract
Quorum sensing (QS) is a sophisticated bacterial communication system which plays a key role in the virulence and biofilm formation of many pathogens. The Pseudomonas aeruginosa QS network consists of four sets of connected systems (las, rlh, pqs and iqs) hierarchically organized. The pqs system involves characteristic autoinducers (AI), most of them sharing an alkylquinolone (AQ) structure, and is able to carry out several relevant biological functions besides its main signalling activity. Their role in bacterial physiology and pathogenicity has been widely studied. Indeed, the presence of these metabolites in several body fluids and infected tissues has pointed to their potential value as biomarkers of infection. In this review, we summarize the most recent findings about the biological implications and the clinical significance of the main P. aeruginosa AQs. These findings have encouraged the development of analytical and bioanalytical techniques addressed to assess the role of these metabolites in bacterial growth and survival, during pathogenesis or as biomarkers of infections. The availability of highly sensitive reliable analytical methods suitable for clinical analysis would allow getting knowledge about pathogenesis and disease prognosis or progression, supporting clinicians on the decision-making process for the management of these infections and guiding them on the application of more effective and appropriate treatments. The benefits from the implementation of the point-of-care (PoC)-type testing in infectious disease diagnostics, which are seen to improve patient outcomes by promoting earlier therapeutic interventions, are also discussed.
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Sikdar R, Elias M. Quorum quenching enzymes and their effects on virulence, biofilm, and microbiomes: a review of recent advances. Expert Rev Anti Infect Ther 2020; 18:1221-1233. [PMID: 32749905 DOI: 10.1080/14787210.2020.1794815] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Numerous bacterial behaviors are regulated by a cell-density dependent mechanism known as Quorum Sensing (QS). QS relies on communication between bacterial cells using diffusible signaling molecules known as autoinducers. QS regulates physiological processes such as metabolism, virulence, and biofilm formation. Quorum Quenching (QQ) is the inhibition of QS using chemical or enzymatic means to counteract behaviors regulated by QS. AREAS COVERED We examine the main, diverse QS mechanisms present in bacterial species, with a special emphasis on AHL-mediated QS. We also discuss key in vitro and in vivo systems in which interference in QS was investigated. Additionally, we highlight promising developments, such as the substrate preference of the used enzymatic quencher, in the application of interference in QS to counter bacterial virulence. EXPERT OPINION Enabled via the recent isolation of highly stable quorum quenching enzymes and/or molecular engineering efforts, the effects of the interference in QS were recently evaluated outside of the traditional model of single species culture. Signal disruption in complex microbial communities was shown to result in the disruption of complex microbial behaviors, and changes in population structures. These new findings, and future studies, may result in significant changes in the traditional views about QS.
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Affiliation(s)
- Rakesh Sikdar
- Biochemistry, Molecular Biology & Biophysics Department and BioTechnology Institute, University of Minnesota , Saint Paul, Minnesota, USA
| | - Mikael Elias
- Biochemistry, Molecular Biology & Biophysics Department and BioTechnology Institute, University of Minnesota , Saint Paul, Minnesota, USA
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Hoang TPT, Barthélemy M, Lami R, Stien D, Eparvier V, Touboul D. Annotation and quantification of N-acyl homoserine lactones implied in bacterial quorum sensing by supercritical-fluid chromatography coupled with high-resolution mass spectrometry. Anal Bioanal Chem 2020; 412:2261-2276. [PMID: 31919609 DOI: 10.1007/s00216-019-02265-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/31/2019] [Accepted: 11/07/2019] [Indexed: 10/25/2022]
Abstract
In recent years, use of supercritical-fluid chromatography (SFC) with CO2 as the mobile phase has been expanding in the research laboratory and industry since it is considered to be a green analytical method. This technique offers numerous advantages, such as good separation and sensitive detection, short analysis times, and stability of analytes. In this study, a method for quantification of N-acyl homoserine lactones (AHLs), signaling molecules responsible for cell-to-cell communication initially discovered in bacteria, by SFC coupled with high-resolution mass spectrometry (HRMS) was developed. The SFC conditions and MS ionization settings were optimized to obtain the best separation and greatest sensitivity. The optimal analysis conditions allowed quantification of up to 30 AHLs in a single run within 16 min with excellent linearity (R2 > 0.998) and sensitivity (picogram level). This method was then applied to study AHL production by one Gram-negative endophytic bacterium, Paraburkholderia sp. BSNB-0670. Nineteen known AHLs were detected, and nine abundant HSLs were quantified. To further investigate the production of uncommon AHLs, a molecular networking approach was applied on the basis of the SFC-HRMS/MS data. This led to additional identification of four unknown AHLs annotated as N-3-hydroxydodecanoylol homoserine lactone, N-3-hydroxydodecadienoyl homoserine lactone, and N-3-oxododecenoyl homoserine lactones (two isomers).
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Affiliation(s)
- Thi Phuong Thuy Hoang
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
| | - Morgane Barthélemy
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
| | - Raphaël Lami
- Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes, USR3579, Observatoire Océanologique de Banyuls-sur-Mer, Avenue Pierre Fabre, 66650, Banyuls-sur-Mer, France
| | - Didier Stien
- Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes, USR3579, Observatoire Océanologique de Banyuls-sur-Mer, Avenue Pierre Fabre, 66650, Banyuls-sur-Mer, France
| | - Véronique Eparvier
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
| | - David Touboul
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198, Gif-sur-Yvette, France.
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Das S, Das S, Ghangrekar M. Quorum-sensing mediated signals: A promising multi-functional modulators for separately enhancing algal yield and power generation in microbial fuel cell. BIORESOURCE TECHNOLOGY 2019; 294:122138. [PMID: 31542496 DOI: 10.1016/j.biortech.2019.122138] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 09/06/2019] [Accepted: 09/08/2019] [Indexed: 02/05/2023]
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Malešević M, Di Lorenzo F, Filipić B, Stanisavljević N, Novović K, Senerovic L, Polović N, Molinaro A, Kojić M, Jovčić B. Pseudomonas aeruginosa quorum sensing inhibition by clinical isolate Delftia tsuruhatensis 11304: involvement of N-octadecanoylhomoserine lactones. Sci Rep 2019; 9:16465. [PMID: 31712724 PMCID: PMC6848482 DOI: 10.1038/s41598-019-52955-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Accepted: 10/26/2019] [Indexed: 12/17/2022] Open
Abstract
Pseudomonas aeruginosa is one of the most common opportunistic pathogens that use quorum sensing (QS) system to regulate virulence factors expression and biofilm development. Delftia sp. 11304 was selected among 663 Gram-negative clinical isolates based on its QS inhibitory activity against P. aeruginosa MMA83 clinical isolate. Whole genome sequencing identified this isolate as D. tsuruhatensis and revealed genetic armamentarium of virulence factors and antibiotic resistance determinants. Ethyl acetate extract of D. tsuruhatensis 11304 culture supernatant (QSI extract) prevented biofilm formation of P. aeruginosa MMA83, but was unable to cause biofilm decomposition. QSI extract showed a synergistic effect in combination with meropenem and gentamycin, against P. aeruginosa MMA83. A dose-dependent reduction of the virulence factors: elastase, rhamnolipid and pyocyanin production by P. aeruginosa MMA83 and significant downregulation of lasI, lasR, rhlI, rhlR, pqs and mvfR expression were observed. Matrix-assisted Laser Desorption Ionization (MALDI) mass spectrometry of D. tsuruhatensis 11304 QSI extract revealed the presence of N-acyl homoserine lactones (AHL) with chain lengths of C12 to C18. The main ion peak was identified as N-octadecanoylhomoserine lactone (C18-HSL). Commercial C18-HSL (20 µM) reduced pyocyanin production as well as mRNA level of the lasI gene. A novel AHL species, dihydroxy-N-octadecanoylhomoserine lactone, was also described.
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Affiliation(s)
- Milka Malešević
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia
| | - Flaviana Di Lorenzo
- University of Napoli Federico II, Department of Chemical Sciences, Napoli, 80126, Italy
| | - Brankica Filipić
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia.,Faculty of Pharmacy, University of Belgrade, Belgrade, 11221, Serbia
| | - Nemanja Stanisavljević
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia
| | - Katarina Novović
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia
| | - Lidija Senerovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia
| | - Natalija Polović
- Faculty of Chemistry, University of Belgrade, Belgrade, 11000, Serbia
| | - Antonio Molinaro
- University of Napoli Federico II, Department of Chemical Sciences, Napoli, 80126, Italy
| | - Milan Kojić
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia
| | - Branko Jovčić
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia. .,Faculty of Biology, University of Belgrade, Belgrade, 11000, Serbia.
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Abdelhamid HN. Ionic Liquid-Assisted Laser Desorption/Ionization-Mass Spectrometry: Matrices, Microextraction, and Separation. Methods Protoc 2018; 1:E23. [PMID: 31164566 PMCID: PMC6526421 DOI: 10.3390/mps1020023] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/13/2018] [Accepted: 06/15/2018] [Indexed: 12/16/2022] Open
Abstract
Ionic liquids (ILs) have advanced a variety of applications, including matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS). ILs can be used as matrices and solvents for analyte extraction and separation prior to analysis using laser desorption/ionization-mass spectrometry (LDI-MS). Most ILs show high stability with negligible sublimation under vacuum, provide high ionization efficiency, can be used for qualitative and quantitative analyses with and without internal standards, show high reproducibility, form homogenous spots during sampling, and offer high solvation efficiency for a wide range of analytes. Ionic liquids can be used as solvents and pseudo-stationary phases for extraction and separation of a wide range of analytes, including proteins, peptides, lipids, carbohydrates, pathogenic bacteria, and small molecules. This review article summarizes the recent advances of ILs applications using MALDI-MS. The applications of ILs as matrices, solvents, and pseudo-stationary phases, are also reviewed.
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Diesner M, Neupert S. Quantification of Biogenic Amines from Individual GFP-Labeled Drosophila Cells by MALDI-TOF Mass Spectrometry. Anal Chem 2018; 90:8035-8043. [DOI: 10.1021/acs.analchem.8b00961] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Max Diesner
- University of Cologne, Department of Biology, Institute for Zoology, Zülpicher Strasse 47b, 50674 Cologne, Germany
| | - Susanne Neupert
- University of Cologne, Department of Biology, Institute for Zoology, Zülpicher Strasse 47b, 50674 Cologne, Germany
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Leipert J, Bobis I, Schubert S, Fickenscher H, Leippe M, Tholey A. Miniaturized dispersive liquid-liquid microextraction and MALDI MS using ionic liquid matrices for the detection of bacterial communication molecules and virulence factors. Anal Bioanal Chem 2018; 410:4737-4748. [PMID: 29470663 DOI: 10.1007/s00216-018-0937-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 01/23/2018] [Accepted: 02/01/2018] [Indexed: 11/30/2022]
Abstract
The identification and quantification of molecules involved in bacterial communication are major prerequisites for the understanding of interspecies interactions at the molecular level. We developed a procedure allowing the determination of 2-heptyl-4(1H)-quinolone (HHQ) and 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS) and the virulence factor pyocyanin (PYO) formed by the Gram-negative bacterium Pseudomonas aeruginosa. The method is based on dispersive liquid-liquid microextraction from small supernatant volumes (below 10 μL) followed by quantitative matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS). The use of ionic liquid matrix led to a lowered limit of detection for pyocyanin and, due to suppression of matrix background signals, easy to interpret mass spectra compared to crystalline matrices. Using an isotope-labeled pyocyanin standard synthesized in small-scale synthesis, quantitative analysis spanning approximately one order of magnitude (0.5 to 250 fmol) was feasible. The method was successfully applied to the detection of the signaling molecules PQS and HHQ in cultures of P. aeruginosa strains isolated from sputum of cystic fibrosis patients and allowed a highly sensitive quantification of PYO from these cultures. Hence, the developed method bears the potential to be used for screening purposes in clinical settings and will help to decipher the molecular basis of bacterial communication. Graphical abstract Ionic liquid matrices for the detection and quantification of the toxin pyocyanin and other signaling molecules from P. aeruginosa by MALDI MS.
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Affiliation(s)
- Jan Leipert
- Systematic Proteome Research & Bioanalytics, Institute for Experimental Medicine, University of Kiel, Niemannsweg 11, 24105, Kiel, Germany
| | - Ingrid Bobis
- Department of Internal Medicine, University Hospital Schleswig-Holstein, Campus Kiel, Arnold-Heller-Straße 3, 24105, Kiel, Germany
| | - Sabine Schubert
- Institute for Infection Medicine, University of Kiel and University Hospital Schleswig-Holstein, Brunswiker Straße 4, 24105, Kiel, Germany
| | - Helmut Fickenscher
- Institute for Infection Medicine, University of Kiel and University Hospital Schleswig-Holstein, Brunswiker Straße 4, 24105, Kiel, Germany
| | - Matthias Leippe
- Zoological Institute, Comparative Immunobiology, University of Kiel, Am Botanischen Garten 1-9, 24118, Kiel, Germany
| | - Andreas Tholey
- Systematic Proteome Research & Bioanalytics, Institute for Experimental Medicine, University of Kiel, Niemannsweg 11, 24105, Kiel, Germany.
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