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Pardeshi S, Shede P. A Novel Device and Method for Assay of Bacterial Chemotaxis Towards Chemoattractants. Indian J Microbiol 2024; 64:990-999. [PMID: 39282202 PMCID: PMC11399546 DOI: 10.1007/s12088-024-01194-w] [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: 07/21/2023] [Accepted: 01/01/2024] [Indexed: 09/18/2024] Open
Abstract
Capillary assemblies and microfluidic devices used for bacterial chemotaxis assays have certain inherent limitations. This opens opportunities for innovation in the area. The present study describes an innovative economical device called chemotaxis plate and also a method to use this device for chemotaxis assay. Two type cultures, Pseudomonas putida MCC 2989 and Bacillus subtilis MCC 2049, chemotactic to L-aspartate, were used to validate the new device and establish the protocol for assay. 100 to 1000 fold higher number of cells were recovered in presence of chemoattractant as compared to control (p < 0.05). This novel assay technique showed 100% sensitivity and 99.21% specificity for chemotaxis assay of Pseudomonas putida MCC 2989 towards 3 mM L-aspartate over 50 min assay time. The device was also used to isolate bacteria chemotactic to caffeine directly from environmental samples. Very high chemotaxis response indices were reported for the first-time using chemotaxis plate.
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Affiliation(s)
- Sheetal Pardeshi
- Department of Microbiology, PES Modern College of Arts, Science and Commerce (Autonomous), Shivajinagar, Pune, 411005 India
- Department of Microbiology, MES Abasaheb Garware College (Autonomous), Karve Road, Pune, 411004 India
| | - Prafulla Shede
- Department of Microbiology, MES Abasaheb Garware College (Autonomous), Karve Road, Pune, 411004 India
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Yadav VK, Khan SH, Choudhary N, Tirth V, Kumar P, Ravi RK, Modi S, Khayal A, Shah MP, Sharma P, Godha M. Nanobioremediation: A sustainable approach towards the degradation of sodium dodecyl sulfate in the environment and simulated conditions. J Basic Microbiol 2021; 62:348-360. [PMID: 34528719 DOI: 10.1002/jobm.202100217] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/20/2021] [Accepted: 08/28/2021] [Indexed: 11/12/2022]
Abstract
Nanotechnology has gained huge importance in the field of environmental clean-up today. Due to their remarkable and unique properties, it has shown potential application for the remediation of several pesticides and textile dyes. Recently it has shown positive results for the remediation of sodium dodecyl sulfate (SDS). One of the highly exploited surfactants in detergent preparation is anionic surfactants. The SDS selected for the present study is an example of anionic linear alkyl sulfate. It is utilized extensively in industrial washing, which results in the high effluent level of this contaminant and ubiquitously toxic to the environment. The present review is based on the research depicting the adverse effects of SDS in general and possible strategies to minimizing its effects by bacterial degradation which are capable of exploiting the SDS as an only source of carbon. Moreover, it has also highlighted that how nanotechnology can play a role in the remediation of such recalcitrant pesticides.
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Affiliation(s)
- Virendra K Yadav
- Department of Microbiology, School of Sciences, P P Savani University, Kosamba, Surat, Gujarat, India.,Environmental Nanotechnology, School of Nanosciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Samreen H Khan
- Environmental Nanotechnology, School of Nanosciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Nisha Choudhary
- Environmental Nanotechnology, School of Nanosciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Vineet Tirth
- Mechanical Engineering Department, College of Engineering, King Khalid University, Abha, Kingdom of Saudi Arabia.,Center for Advanced Materials Science (RCAMS), King Khalid University Guraiger, Abha, Asir, Kingdom of Saudi Arabia
| | - Pankaj Kumar
- Environmental Microbiology, School of Environment and Sustainable Development, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Raman K Ravi
- Environmental Microbiology, School of Environment and Sustainable Development, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Shreya Modi
- Environmental Nanotechnology, School of Nanosciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Areeba Khayal
- Department of Chemistry, Aligarh Muslim University, Aligarh, India
| | - Maulin P Shah
- Industrial Waste Water Research Laboratory, Division of Applied & Environmental Microbiology, Enviro Technology Limited, Ankleshwar, Gujarat, India
| | - Purva Sharma
- Department of Zoology, School of Life Sciences, Jaipur National University, Jaipur, Rajasthan, India
| | - Meena Godha
- Department of Zoology, School of Life Sciences, Jaipur National University, Jaipur, Rajasthan, India
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Balaraman P, Plettner E. Chemotaxis by Pseudomonas putida (ATCC 17453) towards camphor involves cytochrome P450 cam (CYP101A1). Biochim Biophys Acta Gen Subj 2018; 1863:304-312. [PMID: 30391161 DOI: 10.1016/j.bbagen.2018.10.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 10/27/2018] [Accepted: 10/29/2018] [Indexed: 11/29/2022]
Abstract
The camphor-degrading microorganism, Pseudomonas putida strain ATCC 17453, is an aerobic, gram-negative soil bacterium that uses camphor as its sole carbon and energy source. The genes responsible for the catabolic degradation of camphor are encoded on the extra-chromosomal CAM plasmid. A monooxygenase, cytochrome P450cam, mediates hydroxylation of camphor to 5-exo-hydroxycamphor as the first and committed step in the camphor degradation pathway, requiring a dioxygen molecule (O2) from air. Under low O2 levels, P450cam catalyzes the production of borneol via an unusual reduction reaction. We have previously shown that borneol downregulates the expression of P450cam. To understand the function of P450cam and the consequences of down-regulation by borneol under low O2 conditions, we have studied chemotaxis of camphor induced and non-induced P. putida strain ATCC 17453. We have tested camphor, borneol, oxidized camphor metabolites and known bacterial attractants (d)-glucose, (d) - and (l)-glutamic acid for their elicitation chemotactic behavior. In addition, we have used 1-phenylimidazole, a P450cam inhibitor, to investigate if P450cam plays a role in the chemotactic ability of P. putida in the presence of camphor. We found that camphor, a chemoattractant, became toxic and chemorepellent when P450cam was inhibited. We have also evaluated the effect of borneol on chemotaxis and found that the bacteria chemotaxed away from camphor in the presence of borneol. This is the first report of the chemotactic behaviour of P. putida ATCC 17453 and the essential role of P450cam in this process.
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Affiliation(s)
- Priyadarshini Balaraman
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
| | - Erika Plettner
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada.
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Elgamoudi BA, Ketley JM, Korolik V. New approach to distinguishing chemoattractants, chemorepellents and catabolised chemoeffectors for Campylobacter jejuni. J Microbiol Methods 2018; 146:83-91. [PMID: 29428740 DOI: 10.1016/j.mimet.2018.02.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/07/2018] [Accepted: 02/07/2018] [Indexed: 10/18/2022]
Abstract
Chemotactic behaviour is an important part of the lifestyle of motile bacteria and enables cells to respond to various environmental stimuli. The Hard Agar Plug (HAP) method is used to study the chemotactic behaviour of bacteria, including the fastidious microaerophile Campylobacter jejuni, an intestinal pathogen of humans. However, the traditional HAP assay is not quantitative, is unsuitable for chemotaxis observation over short time periods and for the investigation of repellent taxis, and is prone to false-positive and -negative results. Here we report an accurate, rapid, and quantitative HAP-based chemotaxis assay, tHAP, for the investigation of bacterial chemotactic responses. The critical component of the new assay is the addition of triphenyltetrazolium chloride (TTC). Enzymatic reduction of TTC to TFP-Red (1, 3, 5-Triphenylformazan) enables colourimetric detection of actively metabolising bacterial cells. Quantitative assessment of chemotaxis is achieved by colourimetric measurement or viability count over a period of 10 min to 3 h. Using the tHAP assay, we observed the dose-responsive chemotactic motility of C. jejuni cells along different concentrations of attractants aspartate and serine. Importantly, we have also designed a competitive tHAP assay to differentiate between repellents and attractants and to identify chemoeffectors that do not activate metabolism. IMPORTANCE The modified tHAP assay described here enables the exploration of the chemoresponse of Campylobacter jejuni towards chemorepellents, and catabolizable and non-catabolizable chemoattractants.
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Affiliation(s)
- Bassam A Elgamoudi
- Institute for Glycomics, Griffith University, Gold Coast Campus, Gold Coast, Australia; Department of Genetics, University of Leicester, Leicester, United Kingdom
| | - Julian M Ketley
- Department of Genetics, University of Leicester, Leicester, United Kingdom.
| | - Victoria Korolik
- Institute for Glycomics, Griffith University, Gold Coast Campus, Gold Coast, Australia.
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Baune M, Qi Y, Scholz K, Volmer DA, Hayen H. Structural characterization of pyoverdines produced by Pseudomonas putida KT2440 and Pseudomonas taiwanensis VLB120. Biometals 2017. [PMID: 28631237 DOI: 10.1007/s10534-017-0029-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The previously unknown sequences of several pyoverdines (PVD) produced by a biotechnologically-relevant bacterium, namely, Pseudomonas taiwanensis VLB120, were characterized by high performance liquid chromatography (HPLC)-high resolution mass spectrometry (HRMS). The same structural characterization scheme was checked before by analysis of Pseudomonas sp. putida KT2440 samples with known PVDs. A new sample preparation strategy based on solid-phase extraction was developed, requiring significantly reduced sample material as compared to existing methods. Chromatographic separation was performed using hydrophilic interaction liquid chromatography with gradient elution. Interestingly, no signals for apoPVDs were detected in these analyses, only the corresponding aluminum(III) and iron(III) complexes were seen. The chromatographic separation readily enabled separation of PVD complexes according to their individual structures. HPLC-HRMS and complementary fragmentation data from collision-induced dissociation and electron capture dissociation enabled the structural characterization of the investigated pyoverdines. In Pseudomonas sp. putida KT2240 samples, the known pyoverdines G4R and G4R A were readily confirmed. No PVDs have been previously described for Pseudomonas sp. taiwanensis VLB120. In our study, we identified three new PVDs, which only differed in their acyl side chains (succinic acid, succinic amide and malic acid). Peptide sequencing by MS/MS provided the sequence Orn-Asp-OHAsn-Thr-AcOHOrn-Ser-cOHOrn. Of particular interest is the presence of OHAsn, which has not been reported as PVD constituent before.
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Affiliation(s)
- Matthias Baune
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 30, 48149, Münster, Germany
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Dortmund, Germany
| | - Yulin Qi
- Institute of Bioanalytical Chemistry, Saarland University, Saarbrücken, Germany
| | - Karen Scholz
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 30, 48149, Münster, Germany
| | - Dietrich A Volmer
- Institute of Bioanalytical Chemistry, Saarland University, Saarbrücken, Germany
| | - Heiko Hayen
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 30, 48149, Münster, Germany.
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