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Mokrousov I, Vinogradova T, Dogonadze M, Zabolotnykh N, Vyazovaya A, Vitovskaya M, Solovieva N, Ariel B. A multifaceted interplay between virulence, drug resistance, and the phylogeographic landscape of Mycobacterium tuberculosis. Microbiol Spectr 2023; 11:e0139223. [PMID: 37768091 PMCID: PMC10581221 DOI: 10.1128/spectrum.01392-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 08/06/2023] [Indexed: 09/29/2023] Open
Abstract
Latin-American Mediterranean (LAM) family is one of the most significant and global genotypes of Mycobacterium tuberculosis. Here, we used the murine model to study the virulence and lethality of the genetically and epidemiologically distinct LAM strains. The pathobiological characteristics of the four LAM strains (three drug resistant and one drug susceptible) and the susceptible reference strain H37Rv were studied in the C57BL/6 mouse model. The whole-genome sequencing was performed using the HiSeq Illumina platform, followed by bioinformatics and phylogenetic analysis. The susceptible strain H37Rv showed the highest virulence. Drug-susceptible LAM strain (spoligotype SIT264) was more virulent than three multidrug-resistant (MDR) strains (SIT252, SIT254, and SIT266). All three MDR isolates were low lethal, while the susceptible isolate and H37Rv were moderately/highly lethal. Putting the genomic, phenotypic, and virulence features of the LAM strains/spoligotypes in the context of their dynamic phylogeography over 20 years reveals three types of relationships between virulence, resistance, and transmission. First, the most virulent and more lethal drug-susceptible SIT264 increased its circulation in parts of Russia. Second, moderately virulent and pre-XDR SIT266 was prevalent in Belarus and continues to be visible in North-West Russia. Third, the low virulent and MDR strain SIT252 previously considered as emerging has disappeared from the population. These findings suggest that strain virulence impacts the transmission, irrespective of drug resistance properties. The increasing circulation of susceptible but more virulent and lethal strains implies that personalized TB treatment should consider not only resistance but also the virulence of the infecting M. tuberculosis strains. IMPORTANCE The study is multidisciplinary and investigates the epidemically/clinically important and global lineage of Mycobacterium tuberculosis, named Latin-American-Mediterranean (LAM), yet insufficiently studied with regard to its pathobiology. We studied different LAM strains (epidemic vs endemic and resistant vs susceptible) in the murine model and using whole-genome analysis. We also collected long-term, 20-year data on their prevalence in Eurasia. The findings are both expected and unexpected. (i) We observe that a drug-susceptible but highly virulent strain increased its prevalence. (ii) By contrast, the multidrug-resistant (MDR) but low-virulent, low-lethal strain (that we considered as emerging 15 years ago) has almost disappeared. (iii) Finally, an intermediate case is the MDR strain with moderate virulence that continues to circulate. We conclude that (i) the former and latter strains are the most hazardous and require close epidemiological monitoring, and (ii) personalized TB treatment should consider not only drug resistance but also the virulence of the infecting strains and development of anti-virulence drugs is warranted.
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Affiliation(s)
- Igor Mokrousov
- St. Petersburg Pasteur Institute, St. Petersburg, Russia
| | - Tatiana Vinogradova
- St. Petersburg Pasteur Institute, St. Petersburg, Russia
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
| | - Marine Dogonadze
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
| | - Natalia Zabolotnykh
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
| | - Anna Vyazovaya
- St. Petersburg Pasteur Institute, St. Petersburg, Russia
| | - Maria Vitovskaya
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
| | - Natalia Solovieva
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
| | - Boris Ariel
- St. Petersburg Research Institute of Phthisiopulmonology, St. Petersburg, Russia
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Li M, Patel HV, Cognetta AB, Smith TC, Mallick I, Cavalier JF, Previti ML, Canaan S, Aldridge BB, Cravatt BF, Seeliger JC. Identification of cell wall synthesis inhibitors active against Mycobacterium tuberculosis by competitive activity-based protein profiling. Cell Chem Biol 2022; 29:883-896.e5. [PMID: 34599873 PMCID: PMC8964833 DOI: 10.1016/j.chembiol.2021.09.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 07/08/2021] [Accepted: 09/14/2021] [Indexed: 12/14/2022]
Abstract
The identification and validation of a small molecule's targets is a major bottleneck in the discovery process for tuberculosis antibiotics. Activity-based protein profiling (ABPP) is an efficient tool for determining a small molecule's targets within complex proteomes. However, how target inhibition relates to biological activity is often left unexplored. Here, we study the effects of 1,2,3-triazole ureas on Mycobacterium tuberculosis (Mtb). After screening ∼200 compounds, we focus on 4 compounds that form a structure-activity series. The compound with negligible activity reveals targets, the inhibition of which is functionally less relevant for Mtb growth and viability, an aspect not addressed in other ABPP studies. Biochemistry, computational docking, and morphological analysis confirms that active compounds preferentially inhibit serine hydrolases with cell wall and lipid metabolism functions and that disruption of the cell wall underlies biological activity. Our findings show that ABPP identifies the targets most likely relevant to a compound's antibacterial activity.
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Affiliation(s)
- Michael Li
- Department of Pharmacological Sciences and Immunology Stony Brook University, Stony Brook, NY 11790, USA
| | - Hiren V Patel
- Department of Microbiology and Immunology Stony Brook University, Stony Brook, NY 11790, USA
| | - Armand B Cognetta
- Department of Chemistry, Scripps Research Institute, La Jolla, CA 92037, USA
| | - Trever C Smith
- Department of Molecular Biology and Microbiology, Tufts University, Boston, MA 02111, USA
| | - Ivy Mallick
- Aix-Marseille Université, CNRS, LISM, IMM FR3479, 13402 Marseille, France
| | | | - Mary L Previti
- Department of Pharmacological Sciences and Immunology Stony Brook University, Stony Brook, NY 11790, USA
| | - Stéphane Canaan
- Aix-Marseille Université, CNRS, LISM, IMM FR3479, 13402 Marseille, France
| | - Bree B Aldridge
- Department of Molecular Biology and Microbiology, Tufts University, Boston, MA 02111, USA
| | - Benjamin F Cravatt
- Department of Chemistry, Scripps Research Institute, La Jolla, CA 92037, USA
| | - Jessica C Seeliger
- Department of Pharmacological Sciences and Immunology Stony Brook University, Stony Brook, NY 11790, USA.
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Environment dependent expression of mycobacterium hormone sensitive lipases: expression pattern under ex-vivo and individual in-vitro stress conditions in M. tuberculosis H37Ra. Mol Biol Rep 2022; 49:4583-4593. [PMID: 35301657 DOI: 10.1007/s11033-022-07305-4] [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: 10/30/2021] [Revised: 01/27/2022] [Accepted: 02/24/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND Hormone-sensitive lipase (HSL) is a neutral lipase capable of hydrolysing various kinds of lipids. In comparison to single human Hormone Sensitive Lipase (hHSL), that is induced under nutritional stress, twelve serine hydrolases are annotated as HSL in Mycobacterium tuberculosis (mHSL). Mycobacterium is exposed to multiple stresses inside the host. Therefore, the present study was carried out to investigate if mHSL are also expressed under stress condition and if there is any correlation between various stress conditions and expression pattern of mHSL. METHODS AND RESULTS The expression pattern of mHSL under different environmental conditions (in-vitro and ex-vivo) were studied using qRT-PCR in M. tuberculosis H37Ra strain with 16 S rRNA as internal control. Out of 12, only two genes (lipU and lipY) were expressed at very low level in mid log phase culture under aerobic conditions, while 9 genes were expressed at stationary phase of growth. Ten mHSLs were expressed post-infection under ex-vivo conditions in time dependent manner. LipH and lipQ did not express at any time point under ex-vivo condition. The relative expression of most of the genes under individual stress was much higher than observed in ex-vivo conditions. The expression pattern of genes varied with change in stress condition. CONCLUSIONS Different sets of mHSL genes were expressed under different individual stress conditions pointing towards the requirement of different mHSL to combat different stress conditions. Overall, most of the mHSLs have demonstrated stress dependent expression pointing towards their role in intracellular survival of mycobacteria.
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Kumar NG, Contaifer D, Wijesinghe DS, Jefferson KK. Staphylococcus aureus Lipase 3 (SAL3) is a surface-associated lipase that hydrolyzes short chain fatty acids. PLoS One 2021; 16:e0258106. [PMID: 34618844 PMCID: PMC8496776 DOI: 10.1371/journal.pone.0258106] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 09/20/2021] [Indexed: 11/18/2022] Open
Abstract
Bacterial lipases play important roles during infection. The Staphylococcus aureus genome contains several genes that encode well-characterized lipases and several genes predicted to encode lipases or esterases for which the function has not yet been established. In this study, we sought to define the function of an uncharacterized S. aureus protein, and we propose the annotation S. aureus lipase 3 (SAL3) (SAUSA300_0641). We confirmed that SAL3 is a lipase and that it is surface associated and secreted through an unknown mechanism. We determined that SAL3 specifically hydrolyzes short chain (4-carbon and fewer) fatty acids and specifically binds negatively charged lipids including phosphatidic acid, phosphatidylinositol phosphate, and phosphatidylglycerol, which is the most abundant lipid in the staphylococcal cell membrane. Mutating the catalytic triad S66-A, D167-A, S168-A, and H301-A in the recombinant protein abolished lipase activity without altering binding to host lipid substrates. Taken together we report the discovery of a novel lipase from S. aureus specific to short chain fatty acids with yet to be determined roles in host pathogen interactions.
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Affiliation(s)
- Naren Gajenthra Kumar
- Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Daniel Contaifer
- Department of Pharmacotherapy and Outcomes Sciences, School of Pharmacy, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Dayanjan S. Wijesinghe
- Department of Pharmacotherapy and Outcomes Sciences, School of Pharmacy, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Kimberly K. Jefferson
- Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University, Richmond, Virginia, United States of America
- * E-mail:
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Environmental Consortium Containing Pseudomonas and Bacillus Species Synergistically Degrades Polyethylene Terephthalate Plastic. mSphere 2020; 5:5/6/e01151-20. [PMID: 33361127 PMCID: PMC7763552 DOI: 10.1128/msphere.01151-20] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
While several research groups are utilizing purified enzymes to break down postconsumer PET to the monomers TPA and ethylene glycol to produce new PET products, here, we present a group of five soil bacteria in culture that are able to partially degrade this polymer. To date, mixed Pseudomonas spp. and Bacillus spp. biodegradation of PET has not been described, and this work highlights the possibility of using bacterial consortia to biodegrade or potentially to biorecycle PET plastic waste. Plastics, such as polyethylene terephthalate (PET) from water bottles, are polluting our oceans, cities, and soils. While a number of Pseudomonas species have been described that degrade aliphatic polyesters, such as polyethylene (PE) and polyurethane (PUR), few from this genus that degrade the semiaromatic polymer PET have been reported. In this study, plastic-degrading bacteria were isolated from petroleum-polluted soils and screened for lipase activity that has been associated with PET degradation. Strains and consortia of bacteria were grown in a liquid carbon-free basal medium (LCFBM) with PET as the sole carbon source. We monitored several key physical and chemical properties, including bacterial growth and modification of the plastic surface, using scanning electron microscopy (SEM) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) spectroscopy. We detected by-products of hydrolysis of PET using 1H-nuclear magnetic resonance (1H NMR) analysis, consistent with the ATR-FTIR data. The full consortium of five strains containing Pseudomonas and Bacillus species grew synergistically in the presence of PET and the cleavage product bis(2-hydroxyethyl) terephthalic acid (BHET) as sole sources of carbon. Secreted enzymes extracted from the full consortium were capable of fully converting BHET to the metabolically usable monomers terephthalic acid (TPA) and ethylene glycol. Draft genomes provided evidence for mixed enzymatic capabilities between the strains for metabolic degradation of TPA and ethylene glycol, the building blocks of PET polymers, indicating cooperation and ability to cross-feed in a limited nutrient environment with PET as the sole carbon source. The use of bacterial consortia for the biodegradation of PET may provide a partial solution to widespread planetary plastic accumulation. IMPORTANCE While several research groups are utilizing purified enzymes to break down postconsumer PET to the monomers TPA and ethylene glycol to produce new PET products, here, we present a group of five soil bacteria in culture that are able to partially degrade this polymer. To date, mixed Pseudomonas spp. and Bacillus spp. biodegradation of PET has not been described, and this work highlights the possibility of using bacterial consortia to biodegrade or potentially to biorecycle PET plastic waste.
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Mycobacterium tuberculosis LipE Has a Lipase/Esterase Activity and Is Important for Intracellular Growth and In Vivo Infection. Infect Immun 2019; 88:IAI.00750-19. [PMID: 31636137 PMCID: PMC6921666 DOI: 10.1128/iai.00750-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Accepted: 10/11/2019] [Indexed: 01/10/2023] Open
Abstract
Mycobacterium tuberculosis Rv3775 (LipE) was annotated as a putative lipase. However, its lipase activity has never been characterized, and its precise role in tuberculosis (TB) pathogenesis has not been thoroughly studied to date. We overexpressed and purified the recombinant LipE (rLipE) protein and demonstrated that LipE has a lipase/esterase activity. rLipE prefers medium-chain ester substrates, with the maximal activity on hexanoate. Its activity is the highest at 40°C and pH 9. We determined that rLipE hydrolyzes trioctanoate. Using site-directed mutagenesis, we confirmed that the predicted putative activity triad residues Ser97, Gly342, and His363 are essential for the lipase activity of rLipE. The expression of the lipE gene was induced under stressed conditions mimicking M. tuberculosis' intracellular niche. The gene-disrupting mutation of lipE led to significantly reduced bacterial growth inside THP-1 cells and human peripheral blood mononuclear cell-derived macrophages and attenuated M. tuberculosis infection in mice (with ∼8-fold bacterial load reduction in mouse lungs). Our data suggest that LipE functions as a lipase and is important for M. tuberculosis intracellular growth and in vivo infection.
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Hitch TCA, Clavel T. A proposed update for the classification and description of bacterial lipolytic enzymes. PeerJ 2019; 7:e7249. [PMID: 31328034 PMCID: PMC6622161 DOI: 10.7717/peerj.7249] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 06/03/2019] [Indexed: 11/23/2022] Open
Abstract
Bacterial lipolytic enzymes represent an important class of proteins: they provide their host species with access to additional resources and have multiple applications within the biotechnology sector. Since the formalisation of lipolytic enzymes into families and subfamilies, advances in molecular biology have led to the discovery of lipolytic enzymes unable to be classified via the existing system. Utilising sequence-based comparison methods, we have integrated these novel families within the classification system so that it now consists of 35 families and 11 true lipase subfamilies. Representative sequences for each family and subfamily have been defined as well as methodology for accurate comparison of novel sequences against the reference proteins, facilitating the future assignment of novel proteins. Both the code and protein sequences required for integration of additional families are available at: https://github.com/thh32/Lipase_reclassification.
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Affiliation(s)
- Thomas C A Hitch
- Functional Microbiome Research Group, Institute of Medical Microbiology, University Hospital of RWTH Aachen, Aachen, Germany
| | - Thomas Clavel
- Functional Microbiome Research Group, Institute of Medical Microbiology, University Hospital of RWTH Aachen, Aachen, Germany
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8
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Yang D, He X, Li S, Liu J, Stabenow J, Zalduondo L, White S, Kong Y. Rv1075c of Mycobacterium tuberculosis is a GDSL-Like Esterase and Is Important for Intracellular Survival. J Infect Dis 2019; 220:677-686. [DOI: 10.1093/infdis/jiz169] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 04/09/2019] [Indexed: 01/03/2023] Open
Abstract
AbstractMycobacterium tuberculosis lipid metabolism pathways facilitate access to carbon and energy sources during infection. M. tuberculosis gene Rv1075c was annotated as a conserved hypothetical protein. We identified that Rv1075c amino acid sequence shares similarities with other bacterial lipase/esterases and we demonstrated that it has esterase activity, with preference for short-chain fatty acids, particularly acetate, with highest activity at 45°C, pH 9. Site-direct mutagenesis revealed its activity triad as Ser80, Asp244, and His247. We further determined that rRv1075c hydrolyzed triacetin and tributyrin, and it was mainly distributed in cell wall and membrane. Its expression was induced at pH 4.5, mimicking the acidic phagosome of macrophages. Mutation of Rv1075c led to reduced bacterial growth in THP-1 cells and human peripheral blood mononuclear cell-derived macrophages, and attenuated M. tuberculosis infection in mice. Our data suggest that Rv1075c is involved in ester and fatty acid metabolism inside host cells.
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Affiliation(s)
- Dong Yang
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis
| | - Xiaoping He
- Department of Structural Biology, St Jude Children’s Research Hospital, Memphis, Tennessee
| | - Shaoji Li
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis
| | - Jiawang Liu
- Medicinal Chemistry Core, University of Tennessee Health Science Center, Memphis
| | - Jennifer Stabenow
- Regional Biocontainment Laboratory, University of Tennessee Health Science Center, Memphis
| | - Lillian Zalduondo
- Regional Biocontainment Laboratory, University of Tennessee Health Science Center, Memphis
| | - Stephen White
- Department of Structural Biology, St Jude Children’s Research Hospital, Memphis, Tennessee
| | - Ying Kong
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis
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Divya M B, Vemula M, Balakrishnan K, Banerjee S, Guruprasad L. Mycobacterium tuberculosis PE1 and PE2 proteins carrying conserved α/β-serine hydrolase domain are esterases hydrolyzing short to medium chain p-nitrophenyl esters. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2018; 140:90-102. [DOI: 10.1016/j.pbiomolbio.2018.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/23/2018] [Accepted: 04/30/2018] [Indexed: 10/17/2022]
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Rameshwaram NR, Singh P, Ghosh S, Mukhopadhyay S. Lipid metabolism and intracellular bacterial virulence: key to next-generation therapeutics. Future Microbiol 2018; 13:1301-1328. [DOI: 10.2217/fmb-2018-0013] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Lipid metabolism is thought to play a key role in the pathogenicity of several intracellular bacteria. Bacterial lipolytic enzymes hydrolyze lipids from the host cell to release free fatty acids which are used as an energy source and building blocks for the synthesis of cell envelope and also to modulate host immune responses. In this review, we discussed the role of lipid metabolism and lipolytic enzymes in the life cycle and virulence of Mycobacterium tuberculosis and other intracellular bacteria. The lipolytic enzymes appear to be potential candidates for developing novel therapeutics by targeting lipid metabolism for controlling M. tuberculosis and other intracellular pathogenic bacteria. [Formula: see text]
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Affiliation(s)
- Nagender Rao Rameshwaram
- Laboratory of Molecular Cell Biology, Centre for DNA Fingerprinting & Diagnostics (CDFD), Inner Ring Road, Uppal, Hyderabad, India. 500 039
| | - Parul Singh
- Laboratory of Molecular Cell Biology, Centre for DNA Fingerprinting & Diagnostics (CDFD), Inner Ring Road, Uppal, Hyderabad, India. 500 039
- Graduate Studies, Manipal University, Manipal, Karnataka, India. 576 104
| | - Sudip Ghosh
- Molecular Biology Division, National Institute of Nutrition (ICMR), Jamai-Osmania PO, Hyderabad, India. 500 007
| | - Sangita Mukhopadhyay
- Laboratory of Molecular Cell Biology, Centre for DNA Fingerprinting & Diagnostics (CDFD), Inner Ring Road, Uppal, Hyderabad, India. 500 039
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Oxadiazolone derivatives, new promising multi-target inhibitors against M. tuberculosis. Bioorg Chem 2018; 81:414-424. [PMID: 30212765 DOI: 10.1016/j.bioorg.2018.08.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 08/17/2018] [Accepted: 08/20/2018] [Indexed: 11/22/2022]
Abstract
A set of 19 oxadiazolone (OX) derivatives have been investigated for their antimycobacterial activity against two pathogenic slow-growing mycobacteria, Mycobacterium marinum and Mycobacterium bovis BCG, and the avirulent Mycobacterium tuberculosis (M. tb) mc26230. The encouraging minimal inhibitory concentrations (MIC) values obtained prompted us to test them against virulent M. tb H37Rv growth either in broth medium or inside macrophages. The OX compounds displayed a diversity of action and were found to act either on extracellular M. tb growth only with moderated MIC50, or both intracellularly on infected macrophages as well as extracellularly on bacterial growth. Of interest, all OX derivatives exhibited very low toxicity towards host macrophages. Among the six potential OXs identified, HPOX, a selective inhibitor of extracellular M. tb growth, was selected and further used in a competitive labelling/enrichment assay against the activity-based probe Desthiobiotin-FP, in order to identify its putative target(s). This approach, combined with mass spectrometry, identified 18 potential candidates, all being serine or cysteine enzymes involved in M. tb lipid metabolism and/or in cell wall biosynthesis. Among them, Ag85A, CaeA, TesA, KasA and MetA have been reported as essential for in vitro growth of M. tb and/or its survival and persistence inside macrophages. Overall, our findings support the assumption that OX derivatives may represent a novel class of multi-target inhibitors leading to the arrest of M. tb growth through a cumulative inhibition of a large number of Ser- and Cys-containing enzymes involved in various important physiological processes.
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Rastogi R, Kumar A, Kaur J, Saini V, Kaur J, Bhatnagar A. Rv0646c, an esterase from M. tuberculosis, up-regulates the host immune response in THP-1 macrophages cells. Mol Cell Biochem 2018; 447:189-202. [DOI: 10.1007/s11010-018-3303-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 01/25/2018] [Indexed: 12/17/2022]
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Sherlin D, Anishetty S. A pipeline for proteome-scale identification and studies on hormone sensitive lipases in Mycobacterium tuberculosis. Comput Biol Chem 2017; 71:201-206. [PMID: 29145154 DOI: 10.1016/j.compbiolchem.2017.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 05/25/2017] [Accepted: 11/06/2017] [Indexed: 12/01/2022]
Abstract
Hormone sensitive lipases (HSLs) play an important role in the survival of M. tuberculosis during dormancy. They help in the utilization of fatty acids from stored lipids. The objective of the current study was to identify all HSLs from the proteome of M. tuberculosis H37Rv. We have developed a novel HSL identification pipeline, based on amino acid sequence homology, presence of conserved motifs and other sequence features deciphered from known HSL dataset. Through this pipeline, we identified 10 proteins as putative HSLs in M. tuberculosis. We have annotated a lipase LipT, as putative p-nitrobenzyl esterase and also identified a new motif "PGG" which is a possible characteristic motif of a subfamily of HSLs.
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Affiliation(s)
- Durairaj Sherlin
- Centre for Biotechnology, Anna University, Chennai, 600 025, India
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Cyclipostins and Cyclophostin analogs as promising compounds in the fight against tuberculosis. Sci Rep 2017; 7:11751. [PMID: 28924204 PMCID: PMC5603573 DOI: 10.1038/s41598-017-11843-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 08/30/2017] [Indexed: 01/01/2023] Open
Abstract
A new class of Cyclophostin and Cyclipostins (CyC) analogs have been investigated against Mycobacterium tuberculosis H37Rv (M. tb) grown either in broth medium or inside macrophages. Our compounds displayed a diversity of action by acting either on extracellular M. tb bacterial growth only, or both intracellularly on infected macrophages as well as extracellularly on bacterial growth with very low toxicity towards host macrophages. Among the eight potential CyCs identified, CyC17 exhibited the best extracellular antitubercular activity (MIC50 = 500 nM). This compound was selected and further used in a competitive labelling/enrichment assay against the activity-based probe Desthiobiotin-FP in order to identify its putative target(s). This approach, combined with mass spectrometry, identified 23 potential candidates, most of them being serine or cysteine enzymes involved in M. tb lipid metabolism and/or in cell wall biosynthesis. Among them, Ag85A, CaeA and HsaD, have previously been reported as essential for in vitro growth of M. tb and/or survival and persistence in macrophages. Overall, our findings support the assumption that CyC17 may thus represent a novel class of multi-target inhibitor leading to the arrest of M. tb growth through a cumulative inhibition of a large number of Ser- and Cys-containing enzymes participating in important physiological processes.
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Huang X, Chen F, Sun B, Zhang H, Tian Y, Zhu C. Isolation of a fluoroglycofen-degrading KS-1 strain and cloning of a novel esterase gene fluE. FEMS Microbiol Lett 2017; 364:4062150. [PMID: 28854713 DOI: 10.1093/femsle/fnx168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 08/02/2017] [Indexed: 11/12/2022] Open
Abstract
The bacterium KS-1, capable of degrading fluoroglycofen, was isolated from sludge collected at a herbicide factory. The isolate was identified as Lysinibacillus sp. according to its phenotypic features and 16S rDNA phylogeny. KS-1 degraded 85.25% of the fluoroglycofen (50 mg L-1) within 3 days of incubation. The optimum temperature and pH for fluoroglycofen degradation were 30°C and 7.0, respectively. Furthermore, Zn2+ and Cu2+ could significantly decrease the degradation rate. Three degradation products, which appeared during KS-1-mediated fluoroglycofen metabolism, were identified as deethyl-fluoroglycofen, acifluorfen and decarboxylate-acifluorfen. The fluE gene, which encodes a novel esterase that catalyzes the cleavage of carboxyl ester bonds of fluoroglycofen, was cloned from the KS-1 strain. Sequence alignment reveals that FluE shares 30%-40% amino acid sequence identity with members of the hormone sensitive lipase family. FluE was expressed in Escherichia coli BL21 and purified by Ni-NTA affinity chromatography. Purified FluE could efficiently hydrolyze fluoroglycofen and short-chain p-nitrophenol esters. However, no lipolytic activity was observed with esters containing acyl chains longer than 10 carbon atoms, thereby indicating that this enzyme is an esterase.
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Affiliation(s)
- Xing Huang
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Feng Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Bin Sun
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Hao Zhang
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yunlong Tian
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Changxiong Zhu
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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Characterization of an extracellular protein, Rv1076 from M. tuberculosis with a potential role in humoral response. Int J Biol Macromol 2017; 101:621-629. [DOI: 10.1016/j.ijbiomac.2017.03.096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 03/09/2017] [Accepted: 03/13/2017] [Indexed: 10/19/2022]
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17
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Mycobacterium tuberculosis rv1400c encodes functional lipase/esterase. Protein Expr Purif 2017; 129:143-149. [DOI: 10.1016/j.pep.2016.04.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 04/01/2016] [Accepted: 04/28/2016] [Indexed: 11/18/2022]
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18
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Jadeja D, Dogra N, Arya S, Singh G, Singh G, Kaur J. Characterization of LipN (Rv2970c) of Mycobacterium Tuberculosis H37Rv and its Probable Role in Xenobiotic Degradation. J Cell Biochem 2016. [PMID: 26212120 DOI: 10.1002/jcb.25285] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
LipN (Rv2970c) belongs to the Lip family of M. tuberculosis H37Rv and is homologous to the human Hormone Sensitive Lipase. The enzyme demonstrated preference for short carbon chain substrates with optimal activity at 45°C/pH 8.0 and stability between pH 6.0-9.0. The specific activity of the enzyme was 217 U/mg protein with pNP-butyrate as substrate. It hydrolyzed tributyrin to di- and monobutyrin. The active-site residues of the enzyme were confirmed to be Ser216, Asp316, and His346. Tetrahydrolipstatin, RHC-80267 and N-bromosuccinimide inhibited LipN enzyme activity completely. Interestingly, Trp145, a non active-site residue, demonstrated functional role to retain enzyme activity. The enzyme was localized in cytosolic fraction of M. tuberculosis H37Rv. The enzyme was able to synthesize ester of butyric acid, methyl butyrate, in presence of methanol. LipN was able to hydrolyze 4-hydroxyphenylacetate to hydroquinone. The gene was not expressed in in-vitro growth conditions while the expression of rv2970c gene was observed post 6h of macrophage infection by M. tuberculosis H37Ra. Under individual in-vitro stress conditions, the gene was expressed during acidic stress condition only. These findings suggested that LipN is a cytosolic, acid inducible carboxylesterase with no positional specificity in demonstrating activity with short carbon chain substrates. It requires Trp145, a non active site residue, for it's enzyme activity.
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Affiliation(s)
| | - Nandita Dogra
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Stuti Arya
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Gurpreet Singh
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Gurdyal Singh
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Jagdeep Kaur
- Department of Biotechnology, Panjab University, Chandigarh, India
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Mohammad O, Kaur J, Singh G, Faisal SM, Azhar A, Rauf MA, Gupta UD, Gupta P, Pal R, Zubair S. TLR Agonist Augments Prophylactic Potential of Acid Inducible Antigen Rv3203 against Mycobacterium tuberculosis H37Rv in Experimental Animals. PLoS One 2016; 11:e0152240. [PMID: 27023750 PMCID: PMC4811581 DOI: 10.1371/journal.pone.0152240] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Accepted: 03/10/2016] [Indexed: 11/18/2022] Open
Abstract
In general, the members of Lip gene family of Mycobacterium tuberculosis evoke strong immune response in the host. Keeping this fact into consideration, we investigated role of Rv3203, a cell wall associated protein with lipolytic activity, in imparting protection against experimental murine tuberculosis. The data of the present study suggested that archaeosome encapsulated Rv3203 induce strong lymphocyte proliferation, up-regulated Th-1 biased cytokines profile, increased expression of co-stimulatory markers on both antigen presenting cells and T lymphocytes. The immuno-prophylactic response was further modulated by exposure of the animals to zymosan, a TLR2/6 agonist, prior to immunization with archaeosome encapsulated Rv3203. Interestingly, pre-treatment of experimental animals with zymosan boosted strong immunological memory as compared to archaeosome encapsulated Rv3203 as well as BCG vaccine. We conclude that priming of immunized animal with TLR agonist followed by immunization with archaeosomes encapsulated Rv3203 offer substantial protection against tuberculosis infection and could be a potential subunit vaccine based prophylactic strategy.
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Affiliation(s)
- Owais Mohammad
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
- * E-mail: (SZ); (OM)
| | - Jagdeep Kaur
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Gurpreet Singh
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Syed Mohd Faisal
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Asim Azhar
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Mohd Ahmar Rauf
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Umesh Dutt Gupta
- National JALMA Institute for Leprosy & other Mycobacterial Diseases, Tajganj, Agra, India
| | - Pushpa Gupta
- National JALMA Institute for Leprosy & other Mycobacterial Diseases, Tajganj, Agra, India
| | - Rahul Pal
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Swaleha Zubair
- Women’s College, Aligarh Muslim University, Aligarh, India
- * E-mail: (SZ); (OM)
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20
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PE11, a PE/PPE family protein of Mycobacterium tuberculosis is involved in cell wall remodeling and virulence. Sci Rep 2016; 6:21624. [PMID: 26902658 PMCID: PMC4763214 DOI: 10.1038/srep21624] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 01/27/2016] [Indexed: 12/14/2022] Open
Abstract
The role of the unique proline-glutamic acid (PE)/proline-proline-glutamic acid (PPE) family of proteins in the pathophysiology and virulence of Mycobacterium tuberculosis is not clearly understood. One of the PE family proteins, PE11 (LipX or Rv1169c), specific to pathogenic mycobacteria is found to be over-expressed during infection of macrophages and in active TB patients. In this study, we report that M. smegmatis expressing PE11 (Msmeg-PE11) exhibited altered colony morphology and cell wall lipid composition leading to a marked increase in resistance against various environmental stressors and antibiotics. The cell envelope of Msmeg-PE11 also had greater amount of glycolipids and polar lipids. Msmeg-PE11 was found to have better survival rate in infected macrophages. Mice infected with Msmeg-PE11 had higher bacterial load, showed exacerbated organ pathology and mortality. The liver and lung of Msmeg-PE11-infected mice also had higher levels of IL-10, IL-4 and TNF-α cytokines, indicating a potential role of this protein in mycobacterial virulence.
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21
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Lehmann J, Vomacka J, Esser K, Nodwell M, Kolbe K, Rämer P, Protzer U, Reiling N, Sieber SA. Human lysosomal acid lipase inhibitor lalistat impairs Mycobacterium tuberculosis growth by targeting bacterial hydrolases. MEDCHEMCOMM 2016. [DOI: 10.1039/c6md00231e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Lalistat inhibits growth of Mycobacterium tuberculosis in bacterial culture as well as in infected macrophages.
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Affiliation(s)
- J. Lehmann
- Department of Chemistry
- Technische Universität München
- 85748 Garching
- Germany
| | - J. Vomacka
- Department of Chemistry
- Technische Universität München
- 85748 Garching
- Germany
| | - K. Esser
- Institut für Virologie
- Technische Universität München/Helmholtz Zentrum München
- 81675 München
- Germany
| | - M. Nodwell
- Department of Chemistry
- Technische Universität München
- 85748 Garching
- Germany
| | - K. Kolbe
- Forschungszentrum Borstel
- Leibniz-Zentrum für Medizin und Biowissenschaften
- FG Mikrobielle Grenzflächenbiologie
- 23845 Borstel
- Germany
| | - P. Rämer
- Institut für Medizinische Mikrobiologie, Immunologie und Hygiene
- Technische Universität München
- 81675 München
- Germany
| | - U. Protzer
- Institut für Virologie
- Technische Universität München/Helmholtz Zentrum München
- 81675 München
- Germany
- German Center for Infection Research (DZIF)
| | - N. Reiling
- Forschungszentrum Borstel
- Leibniz-Zentrum für Medizin und Biowissenschaften
- FG Mikrobielle Grenzflächenbiologie
- 23845 Borstel
- Germany
| | - S. A. Sieber
- Department of Chemistry
- Technische Universität München
- 85748 Garching
- Germany
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22
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Cao J, Dang G, Li H, Li T, Yue Z, Li N, Liu Y, Liu S, Chen L. Identification and Characterization of Lipase Activity and Immunogenicity of LipL from Mycobacterium tuberculosis. PLoS One 2015; 10:e0138151. [PMID: 26398213 PMCID: PMC4580317 DOI: 10.1371/journal.pone.0138151] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Accepted: 08/25/2015] [Indexed: 01/06/2023] Open
Abstract
Lipids and lipid-metabolizing esterases/lipases are highly important for the mycobacterial life cycle and, possibly, for mycobacterial virulence. In this study, we expressed 10 members of the Lip family of Mycobacterium tuberculosis. Among the 10 proteins, LipL displayed a significantly high enzymatic activity for the hydrolysis of long-chain lipids. The optimal temperature for the lipase activity of LipL was demonstrated to be 37°C, and the optimal pH was 8.0. The lipase active center was not the conserved motif G-x-S-x-G, but rather the S-x-x-K and GGG motifs, and the key catalytic amino acid residues were identified as G50, S88, and K91, as demonstrated through site-directed mutagenesis experiments. A three-dimensional modeling structure of LipL was constructed, which showed that the GGG motif was located in the surface of a pocket structure. Furthermore, the subcellular localization of LipL was demonstrated to be on the mycobacterial surface by Western blot analysis. Our results revealed that the LipL protein could induce a strong humoral immune response in humans and activate a CD8+ T cell-mediated response in mice. Overall, our study identified and characterized a novel lipase denoted LipL from M. tuberculosis, and demonstrated that LipL functions as an immunogen that activates both humoral and cell-mediated responses.
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Affiliation(s)
- Jun Cao
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Guanghui Dang
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Huafang Li
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Tiantian Li
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Zhiguo Yue
- Heilongjiang Provincial Hospital for Prevention and Treatment of Tuberculosis, Harbin, PR China
| | - Na Li
- Heilongjiang Provincial Hospital for Prevention and Treatment of Tuberculosis, Harbin, PR China
| | - Yajun Liu
- Heilongjiang Provincial Hospital for Prevention and Treatment of Tuberculosis, Harbin, PR China
| | - Siguo Liu
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
- * E-mail: (SL); (LC)
| | - Liping Chen
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
- * E-mail: (SL); (LC)
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23
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Expression, Purification and Characterisation of Secreted Esterase Rv2525c from Mycobacterium tuberculosis. Appl Biochem Biotechnol 2015; 176:1-12. [DOI: 10.1007/s12010-015-1555-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 02/22/2015] [Indexed: 10/23/2022]
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24
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Tallman KR, Beatty KE. Far-red fluorogenic probes for esterase and lipase detection. Chembiochem 2014; 16:70-5. [PMID: 25469918 DOI: 10.1002/cbic.201402548] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Indexed: 11/05/2022]
Abstract
Fluorogenic enzyme probes go from a dark to a bright state following hydrolysis and can provide a sensitive, real-time readout of enzyme activity. They are useful for examining enzymatic activity in bacteria, including the human pathogen Mycobacterium tuberculosis. Herein, we describe two fluorogenic esterase probes derived from the far-red fluorophore 7-hydroxy-9H-(1,3-dichloro-9,9-dimethylacridin-2-one) (DDAO). These probes offer enhanced optical properties compared to existing esterase probes because the hydrolysis product, DDAO, excites above 600 nm while retaining a good quantum yield (ϕ=0.40). We validated both probes with a panel of commercially available enzymes alongside known resorufin- and fluorescein-derived esterase substrates. Furthermore, we used these probes to reveal esterase activity in protein gel-resolved mycobacterial lysates. These probes represent new tools for esterase detection and characterization and should find use in a variety of applications.
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Affiliation(s)
- Katie R Tallman
- Department of Physiology and Pharmacology, Department of Biomedical Engineering, Oregon Health & Science University, 2730 SW Moody Avenue, CL3B, Portland, OR 97201 (USA)
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25
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Motswaledi MS, Sekgwama R, Kasvosve I. Tuberculosis alters pancreatic enzymes in the absence of pancreatitis. Afr J Lab Med 2014; 3:129. [PMID: 29043180 PMCID: PMC5637765 DOI: 10.4102/ajlm.v3i1.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Accepted: 07/17/2014] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Lipases and phospholipases are thought to contribute to the pathogenesis of Mycobacterium tuberculosis (MTB) infection. Genes coding for lipases, phospholipases and amylase are present in MTB, enabling the bacteria to produce these enzymes. OBJECTIVE To compare serum lipase and amylase activity levels in patients with tuberculosis (TB) against those of healthy controls. METHODS Serum lipase and amylase activity levels were measured in 99 patients and 143 healthy controls using the Vitros 250 Chemistry analyser. Reference ranges for serum lipase and amylase were 23-300 U/L and 30-110 U/L, respectively. RESULTS Lipase was higher in patients with MTB than in controls (81.5 IU/L versus 66.5 IU/L, p = 0.006). Similarly, amylase was higher in the MTB patient group (76 IU/L versus 60 IU/L, p < 0.001). The Pearson correlation coefficient for lipase versus amylase (R) was higher in the controls (R = 0.351, p < 0.0001) compared with MTB patients (R = 0.217, p = 0.035). Amongst MTB patients, lipase activity correlated positively with erythrocyte sedimentation rate (ESR) (R = 0.263, p = 0.013), but not with haemoglobin concentration or treatment duration. A weak inverse correlation was noted between ESR and treatment duration (R = -0.222, p = 0.028). CONCLUSION Pancreatic enzyme levels differ between MTB patients and normal controls; however, this difference still lies within the normal range. The concomitant increase of lipase with ESR, an inflammatory marker, could conceivably suggest a causal relationship. Further research is necessary to characterise MTB-derived enzymes for diagnostic and therapeutic utility.
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Affiliation(s)
- Modisa S Motswaledi
- Faculty of Health Sciences, Department of Medical Laboratory Sciences, University of Botswana, Botswana
| | | | - Ishmael Kasvosve
- Faculty of Health Sciences, Department of Medical Laboratory Sciences, University of Botswana, Botswana
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26
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Chen L, Dang G, Deng X, Cao J, Yu S, Wu D, Pang H, Liu S. Characterization of a novel exported esterase Rv3036c from Mycobacterium tuberculosis. Protein Expr Purif 2014; 104:50-6. [PMID: 25224799 DOI: 10.1016/j.pep.2014.09.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 09/05/2014] [Accepted: 09/07/2014] [Indexed: 10/24/2022]
Abstract
Mycobacterium tuberculosis possesses an unusually high number of genes involved in the metabolism of lipids. Driven by a newly described esterase motif SXXK in the amino acid sequence and a predicted signal peptide, the gene rv3036c from M. tuberculosis was cloned and characterized biochemically. Rv3036c efficiently hydrolyzes soluble p-nitrophenyl esters but not emulsified lipid. The highest activity of this enzyme was observed when p-nitrophenyl acetate (C2) was used as the substrate. Based on the activities, Rv3036c was classified as a nonlipolytic hydrolase. The results of immunoreactivity studies on the subcellular mycobacterial fractions suggested that the enzyme was present in the cell wall and cell membrane in mycobacteria. In summary, Rv3036c was characterized as a novel cell wall-anchored esterase from M. tuberculosis.
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Affiliation(s)
- Liping Chen
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 15000, PR China
| | - Guanghui Dang
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 15000, PR China; School of Medicine, Tsinghua University, Beijing 100084, PR China; Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Xiaoxia Deng
- School of Medicine, Tsinghua University, Beijing 100084, PR China
| | - Jun Cao
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 15000, PR China
| | - Shenye Yu
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 15000, PR China
| | - Defeng Wu
- Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Hai Pang
- School of Medicine, Tsinghua University, Beijing 100084, PR China.
| | - Siguo Liu
- Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 15000, PR China.
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27
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Ravindran MS, Rao SPS, Cheng X, Shukla A, Cazenave-Gassiot A, Yao SQ, Wenk MR. Targeting lipid esterases in mycobacteria grown under different physiological conditions using activity-based profiling with tetrahydrolipstatin (THL). Mol Cell Proteomics 2013; 13:435-48. [PMID: 24345785 DOI: 10.1074/mcp.m113.029942] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tetrahydrolipstatin (THL) is bactericidal but its precise target spectrum is poorly characterized. Here, we used a THL analog and activity-based protein profiling to identify target proteins after enrichment from whole cell lysates of Mycobacterium bovis Bacillus Calmette-Guérin cultured under replicating and non-replicating conditions. THL targets α/β-hydrolases, including many lipid esterases (LipD, G, H, I, M, N, O, V, W, and TesA). Target protein concentrations and total esterase activity correlated inversely with cellular triacylglycerol upon entry into and exit from non-replicating conditions. Cellular overexpression of lipH and tesA led to decreased THL susceptibility thus providing functional validation. Our results define the target spectrum of THL in a biological species with particularly diverse lipid metabolic pathways. We furthermore derive a conceptual approach that demonstrates the use of such THL probes for the characterization of substrate recognition by lipases and related enzymes.
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Affiliation(s)
- Madhu Sudhan Ravindran
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456
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28
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Characterization of an acid inducible lipase Rv3203 from Mycobacterium tuberculosis H37Rv. Mol Biol Rep 2013; 41:285-96. [DOI: 10.1007/s11033-013-2861-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 11/05/2013] [Indexed: 10/26/2022]
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29
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Molecular Characterization of Oxidative Stress-Inducible LipD of Mycobacterium tuberculosis H37Rv. Curr Microbiol 2013; 68:387-96. [DOI: 10.1007/s00284-013-0486-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Accepted: 09/28/2013] [Indexed: 01/09/2023]
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30
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Shao H, Xu L, Yan Y. Thermostable lipases from extremely radioresistant bacteriumDeinococcus radiodurans: Cloning, expression, and biochemical characterization. J Basic Microbiol 2013; 54:984-95. [DOI: 10.1002/jobm.201300434] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 07/21/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Hua Shao
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology; Huazhong University of Science and Technology; Wuhan P. R. China
| | - Li Xu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology; Huazhong University of Science and Technology; Wuhan P. R. China
| | - Yunjun Yan
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology; Huazhong University of Science and Technology; Wuhan P. R. China
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31
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Lipid Droplets and Mycobacterium leprae Infection. J Pathog 2012; 2012:361374. [PMID: 23209912 PMCID: PMC3503283 DOI: 10.1155/2012/361374] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Accepted: 10/12/2012] [Indexed: 12/16/2022] Open
Abstract
Leprosy is a chronic infectious disease and is a major source of morbidity in developing countries. Leprosy is caused by the obligate intracellular bacterium Mycobacterium leprae, which infects as primary target Schwann cells. Lepromatous leprosy exhibits multiple lesions of the skin, eyes, nerves, and lymph nodes. The sites of infection are characterized by the presence of foamy macrophages, fully packed with lipid droplets (LDs), which are induced by M. leprae. In the last years, it has become evident that M. tuberculosis imports lipids from foamy macrophages and is dependent on fatty acids for growth in infected macrophages. M. leprae seems to have similar mechanisms for scavenging lipids from the host. But due to the inability to culture M. leprae on laboratory media, research progresses only slowly. However, in the last years, substantial progress has been made in the field of lipid metabolism in M. leprae. Herein, we will present and summarize the lipid droplets formation and the metabolism of lipids during M. leprae infection.
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32
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Saravanan P, Avinash H, Dubey VK, Patra S. Targeting essential cell wall lipase Rv3802c for potential therapeutics against tuberculosis. J Mol Graph Model 2012; 38:235-42. [PMID: 23085165 DOI: 10.1016/j.jmgm.2012.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 06/15/2012] [Accepted: 06/19/2012] [Indexed: 11/17/2022]
Abstract
Cell wall and lipid metabolism plays a vital role in the survival and infection of Mycobacterium tuberculosis. Increase in the incidences of life-threatening multidrug-resistant (MDR) and extreme drug-resistant (XDR) tuberculosis worsens the existing scenario and urge the need of new druggable targets and new drugs. Targeting Rv3802c, an essential cell wall lipase, can open up a new arsenal to fight the dreadful opportunistic pathogen. Our current study highlights the essentiality of Rv3802c. Its 3D structure is predicted for the first time which provides insight in identifying the ligand binding sites. Our analysis showed Rv3802c is highly conserved throughout mycobacterial species with no significant sequence homolog found in human proteome. Virtual screening followed by comparative docking studies of Rv3802c with its closest human structural homolog has been carried out to identify potential inhibitors effective towards mycobacterial proteins. Two diverse molecules from ZINC database, ZINC26726377 and ZINC43866786 have been identified as potential inhibitors effective towards Rv3802c based on the difference in predicted binding free energy of -3.99 and -3.28kcal/mol respectively. Rv3802c is a promising drug target and also a step towards understanding and targeting the pathogen's cell wall and lipid metabolism simultaneously to combat tuberculosis.
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Affiliation(s)
- Parameswaran Saravanan
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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33
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MmPPOX inhibits Mycobacterium tuberculosis lipolytic enzymes belonging to the hormone-sensitive lipase family and alters mycobacterial growth. PLoS One 2012; 7:e46493. [PMID: 23029536 PMCID: PMC3460867 DOI: 10.1371/journal.pone.0046493] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Accepted: 09/05/2012] [Indexed: 11/19/2022] Open
Abstract
Lipid metabolism plays an important role during the lifetime of Mycobacterium tuberculosis, the causative agent of tuberculosis. Although M. tuberculosis possesses numerous lipolytic enzymes, very few have been characterized yet at a biochemical/pharmacological level. This study was devoted to the M. tuberculosis lipolytic enzymes belonging to the Hormone-Sensitive Lipase (HSL) family, which encompasses twelve serine hydrolases closely related to the human HSL. Among them, nine were expressed, purified and biochemically characterized using a broad range of substrates. In vitro enzymatic inhibition studies using the recombinant HSL proteins, combined with mass spectrometry analyses, revealed the potent inhibitory activity of an oxadiazolone compound, named MmPPOX. In addition, we provide evidence that MmPPOX alters mycobacterial growth. Overall, these findings suggest that the M. tuberculosis HSL family displays important metabolic functions, thus opening the way to further investigations linking the involvement of these enzymes in mycobacterial growth.
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Stehr M, Elamin AA, Singh M. Cytosolic lipid inclusions formed during infection by viral and bacterial pathogens. Microbes Infect 2012; 14:1227-37. [PMID: 22982567 DOI: 10.1016/j.micinf.2012.08.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 08/03/2012] [Accepted: 08/06/2012] [Indexed: 02/07/2023]
Abstract
Lipid inclusions play an important role in several pathological processes. Intracellular bacterial pathogens, such as members of the Mycobacterium and Chlamydia species are able to trigger the formation of lipid-laden foamy macrophages. Lipid droplet accumulation in the host constitutes a reservoir used by the bacilli for long-term persistence. Viruses need lipid droplets as assembly platform. We present the current knowledge about structural, functional and regulatory aspects of lipid inclusions.
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Affiliation(s)
- Matthias Stehr
- Department of Gene Regulation and Differentiation, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, Braunschweig, Germany.
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Kowalczewska M, Vellaiswamy M, Nappez C, Vincentelli R, Scola BL, Raoult D. Protein candidates for the serodiagnosis of rickettsioses: 1. ACTA ACUST UNITED AC 2012; 64:130-3. [DOI: 10.1111/j.1574-695x.2011.00906.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/20/2011] [Accepted: 10/31/2011] [Indexed: 11/30/2022]
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Ali YB, Verger R, Abousalham A. Lipases or esterases: does it really matter? Toward a new bio-physico-chemical classification. Methods Mol Biol 2012; 861:31-51. [PMID: 22426710 DOI: 10.1007/978-1-61779-600-5_2] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Carboxylester hydrolases, commonly named esterases, consist of a large spectrum of enzymes defined by their ability to catalyze the hydrolysis of carboxylic ester bonds and are widely distributed among animals, plants, and microorganisms. Lipases are lipolytic enzymes which constitute a special class of carboxylic esterases capable of releasing long-chain fatty acids from natural water-insoluble carboxylic esters. However, up to now, several unsuccessful attempts aimed at differentiating "lipases" from "esterases" by using various criteria. These criteria were based on the first substrate used chronologically, primary sequence comparisons, some kinetic parameters, or some structural features.Lipids are biological compounds which, by definition, are insoluble in water. Taking into account this basic physico-chemical criterion, we primarily distinguish lipolytic esterases (L, acting on lipids) from nonlipolytic esterases (NL, not acting on lipids). In view of the biochemical data accumulated up to now, we proposed a new classification of esterases based on various criteria of physico-chemical, chemical, anatomical, or cellular nature. We believe that the present attempt matters scientifically for several reasons: (1) to help newcomers in the field, performing a few key experiments to figure out if a newly isolated esterase is lipolytic or not; (2) to clarify a debate between scientists in the field; and (3) to formulate questions which are relevant to the still unsolved problem of the structure-function relationships of esterases.
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Affiliation(s)
- Yassine Ben Ali
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS, University of Sfax, Sfax, Tunisia
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LipC (Rv0220) is an immunogenic cell surface esterase of Mycobacterium tuberculosis. Infect Immun 2011; 80:243-53. [PMID: 22038913 DOI: 10.1128/iai.05541-11] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We have reported previously the identification of novel proteins of Mycobacterium tuberculosis by the immunoscreening of an expression library of M. tuberculosis genomic DNA with sera obtained from M. tuberculosis-infected rabbits at 5 weeks postinfection. In this study, we report the further characterization of one of these antigens, LipC (Rv0220). LipC is annotated as a member of the Lip family based on the presence of the consensus motif "GXSXG" characteristic of esterases. Although predicted to be a cytoplasmic enzyme, we provide evidence that LipC is a cell surface protein that is present in both the cell wall and the capsule of M. tuberculosis. Consistent with this localization, LipC elicits strong humoral immune responses in both HIV-negative (HIV-) and HIV-positive (HIV+) tuberculosis (TB) patients. The absence of anti-LipC antibodies in sera from purified protein derivative-positive (PPD+) healthy subjects confirms its expression only during active M. tuberculosis infection. Epitope mapping of LipC identified 6 immunodominant epitopes, 5 of which map to the exposed surface of the modeled LipC protein. The recombinant LipC (rLipC) protein also elicits proinflammatory cytokine and chemokine responses from macrophages and pulmonary epithelial cells. rLipC can hydrolyze short-chain esters with the carbon chain containing 2 to 10 carbon atoms. Together, these studies demonstrate that LipC is a novel cell surface-associated esterase of M. tuberculosis that is highly immunogenic and elicits both antibodies and cytokines/chemokines.
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Xu G, Jia H, Li Y, Liu X, Li M, Wang Y. Hemolytic phospholipase Rv0183 of Mycobacterium tuberculosis induces inflammatory response and apoptosis in alveolar macrophage RAW264.7 cells. Can J Microbiol 2011; 56:916-24. [PMID: 21076482 DOI: 10.1139/w10-079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The metabolic pathway of phospholipids is one of the most important physiologic pathways in Mycobacterium tuberculosis, a typical intracellular bacterium. The hemolytic phospholipase lip gene (Rv0183) is one of 24 phospholipase genes that have been demonstrated to play critical roles in the metabolism of phospholipids in M. tuberculosis. Quantitative RT-PCR and flow cytometry were used to elucidate the immunological and pathogenic implications of the Rv0183 gene on the inflammatory response following persistent expression of Rv0183 in mouse alveolar macrophage RAW264.7 cells. Our results demonstrate that a time-course-dependent ectopic expression of Rv0183 significantly elevated the expression of IL-6, NF-κB, TLR-2, TLR-6, TNFα, and MyD88 in these alveolar macrophage cells. Furthermore, the persistent expression of Rv0183 induced RAW264.7 cell apoptosis in vitro. These findings demonstrate that the expression of Rv0183 induces an inflammatory response and cell apoptosis in the host cells, suggesting that Rv0183 may play an important role in the virulence and pathogenesis of M. tuberculosis infection.
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Affiliation(s)
- Guangxian Xu
- College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China
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Vellaiswamy M, Kowalczewska M, Merhej V, Nappez C, Vincentelli R, Renesto P, Raoult D. Characterization of rickettsial adhesin Adr2 belonging to a new group of adhesins in α-proteobacteria. Microb Pathog 2011; 50:233-42. [PMID: 21288480 DOI: 10.1016/j.micpath.2011.01.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 01/17/2011] [Accepted: 01/24/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND Rickettsia prowazekii is the etiological agent of epidemic typhus and is an obligate intracellular bacterium that grows as a parasite freely within the cytoplasm of a eukaryotic host cell. Previous studies have shown that rOmpA and rOmpB which belong to the family of rickettsial cell surface antigens are involved in vitro in the adhesion of Rickettsiae to epithelial cells. Recently, two putative rickettsial adhesins have been identified using high resolution 2D-PAGE coupled with mass spectrometry. In this study, we further characterize and describe the adhesin Adr2 from R. prowazekii. METHODOLOGY/PRINCIPAL FINDINGS Using an overlay assay coupled with mass spectrometry two adhesins, Adr1 (RP827) and Adr2 (RP828), were identified from the R. prowazekii proteome Recombinant R. prowazekii Adr2 was expressed through fusion with Dsbc in Escherichia coli, purified and concentrated, thus allowing production of specific monoclonal antibodies, as confirmed by western blot assays. Finally, inhibition of rickettsiae-induced cytotoxicity with monoclonal anti-Adr2 antibody has showed a greatest impact on bacterial cell entry at 8 h post-infection (ca50%) and then decreased progressively to attempt 18% of inhibition at day 7. These, correlated to the inhibition of rickettsiae-induced cytotoxicity with monoclonal anti-rOmpB antibody. Thus, Adr2 is sufficient to mediate R. prowazekii entry into the cell at early stage of mammalian cell infection. CONCLUSIONS Our results suggest that R. prowazekii Adr2 could be the main actor promoting the entry of rickettsiae into the host cells. The present study opens the framework for future investigations for better understanding of the Adr2 -mediated mechanisms involved in adhesion/invasion or intracellular survival of R. prowazekii.
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Affiliation(s)
- Manohari Vellaiswamy
- Université de la Méditerranée, Unité des Rickettsies, URMITE CNRS-IRD, Faculté de Médecine, 27 Bd Jean Moulin, 13385 Marseille cedex 05, France
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Xu L, Guo J, Zheng X, Wen T, Sun F, Liu S, Pang H. Crystallization and preliminary X-ray analysis of a novel esterase Rv0045c from Mycobacterium tuberculosis. Acta Crystallogr Sect F Struct Biol Cryst Commun 2010; 66:1579-82. [PMID: 21139199 PMCID: PMC2998358 DOI: 10.1107/s1744309110026606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 09/01/2010] [Indexed: 11/10/2022]
Abstract
The Rv0045c protein is predicted to be an esterase that is involved in lipid metabolism in Mycobacterium tuberculosis. The protein was overproduced in Escherichia coli, purified and crystallized using the hanging-drop vapour-diffusion method. The Rv0045c protein crystals diffracted to a resolution of 2.7 Å using a synchrotron-radiation source and belonged to space group P3(1) or P3(2), with unit-cell parameters a=b=73.465, c=48.064 Å, α=β=90, γ=120°. Purified SeMet-labelled Rv0045c protein was also crystallized and formed crystals that diffracted to a resolution of 3.0 Å using an in-house X-ray radiation source.
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Affiliation(s)
- Lipeng Xu
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
- Harbin Veterinary Research Institute, Chinese Academy of Agriculture, Harbin 150001, People’s Republic of China
| | - Jiubiao Guo
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Xiangdong Zheng
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Tingyi Wen
- Department of Industrial Microbiology and Biotechnology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
| | - Fei Sun
- Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
| | - Siguo Liu
- Harbin Veterinary Research Institute, Chinese Academy of Agriculture, Harbin 150001, People’s Republic of China
| | - Hai Pang
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
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Chahinian H, Fantini J, Garmy N, Manco G, Sarda L. Non-lipolytic and lipolytic sequence-related carboxylesterases: A comparative study of the structure–function relationships of rabbit liver esterase 1 and bovine pancreatic bile-salt-activated lipase. Biochim Biophys Acta Mol Cell Biol Lipids 2010; 1801:1195-204. [DOI: 10.1016/j.bbalip.2010.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 07/07/2010] [Accepted: 07/09/2010] [Indexed: 10/19/2022]
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Singh G, Singh G, Jadeja D, Kaur J. Lipid hydrolizing enzymes in virulence: Mycobacterium tuberculosis as a model system. Crit Rev Microbiol 2010; 36:259-69. [PMID: 20500016 DOI: 10.3109/1040841x.2010.482923] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This review is focused on the virulent traits of lipolytic enzymes from bacteria with special emphasis on Mycobacterium tuberculosis. In vivo, triacylglycerols in the form of inclusion bodies are present in tubercle bacilli in the lungs. This pathogenic bacterium possesses a lipase gene (Lip) family, which is expressed and differentially regulated under a variety of in vitro conditions. Not much research work has been carried out on these lipolytic enzymes. A better understanding of lipolytic enzymes in mycobacteria would lead to develop new strategies for tuberculosis treatment. The present review highlights the recent work done in the field of mycobacterium lipolytic enzymes and their involvement in the virulence and pathogenicity.
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Affiliation(s)
- Gurdyal Singh
- Department of Biotechnology, Panjab University, Chandigarh-160014, India
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43
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Guo J, Zheng X, Xu L, Liu Z, Xu K, Li S, Wen T, Liu S, Pang H. Characterization of a novel esterase Rv0045c from Mycobacterium tuberculosis. PLoS One 2010; 5. [PMID: 20957207 PMCID: PMC2948520 DOI: 10.1371/journal.pone.0013143] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Accepted: 09/08/2010] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND It was proposed that there are at least 250 enzymes in M. tuberculosis involved in lipid metabolism. Rv0045c was predicted to be a hydrolase by amino acid sequence similarity, although its precise biochemical characterization and function remained to be defined. METHODOLOGY/PRINCIPAL FINDINGS We expressed the Rv0045c protein to high levels in E. coli and purified the protein to high purity. We confirmed that the prepared protein was the Rv0045c protein by mass spectrometry analysis. Circular dichroism spectroscopy analysis showed that the protein possessed abundant β-sheet secondary structure, and confirmed that its conformation was stable in the range pH 6.0-10.0 and at temperatures ≤ 40 °C. Enzyme activity analysis indicated that the Rv0045c protein could efficiently hydrolyze short chain p-nitrophenyl esters (C₂-C₈), and its suitable substrate was p-nitrophenyl caproate (C₆) with optimal catalytic conditions of 39 °C and pH 8.0. CONCLUSIONS/SIGNIFICANCE Our results demonstrated that the Rv0045c protein is a novel esterase. These experiments will be helpful in understanding ester/lipid metabolism related to M. tuberculosis.
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Affiliation(s)
- Jiubiao Guo
- School of Medicine, Tsinghua University, Beijing, China
- Harbin Veterinary Research Institute, Chinese Academy of Agriculture, Harbin, China
| | | | - Lipeng Xu
- School of Medicine, Tsinghua University, Beijing, China
| | - Zhongyuan Liu
- School of Medicine, Tsinghua University, Beijing, China
| | - Kehui Xu
- School of Medicine, Tsinghua University, Beijing, China
| | - Shentao Li
- Department of Immunology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Tingyi Wen
- Department of Industrial Microbiology and Biotechnology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Siguo Liu
- Harbin Veterinary Research Institute, Chinese Academy of Agriculture, Harbin, China
- * E-mail: (SL); (HP)
| | - Hai Pang
- School of Medicine, Tsinghua University, Beijing, China
- * E-mail: (SL); (HP)
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Mammalian G-protein-coupled receptor expression in Escherichia coli: I. High-throughput large-scale production as inclusion bodies. Anal Biochem 2009; 386:147-55. [DOI: 10.1016/j.ab.2008.12.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Revised: 11/27/2008] [Accepted: 12/13/2008] [Indexed: 11/20/2022]
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45
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West NP, Chow FME, Randall EJ, Wu J, Chen J, Ribeiro JMC, Britton WJ. Cutinase-like proteins of Mycobacterium tuberculosis: characterization of their variable enzymatic functions and active site identification. FASEB J 2009; 23:1694-704. [PMID: 19225166 DOI: 10.1096/fj.08-114421] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Discovery and characterization of novel secreted enzymes of Mycobacterium tuberculosis are important for understanding the pathogenesis of one of the most important human bacterial pathogens. The proteome of M. tuberculosis contains over 400 potentially secreted proteins, the majority of which are uncharacterized. A family of seven cutinase-like proteins (CULPs) was identified by bioinformatic analysis, expressed and purified from Escherichia coli, and characterized in terms of their enzymatic activities. These studies revealed a functional diversity of enzyme classes based on differential preferences for substrate chain length. One member, Culp1, exhibited strong esterase activity, 40-fold higher than that of Culp6, which had strong activity as a lipase. Another, Culp4, performed moderately as an esterase and weakly as a lipase. Culp6 lipase activity was optimal above pH 7.0, and fully maintained to pH 8.5. None of the CULP members exhibited cutinase activity. Site-directed mutagenesis of each residue of the putative catalytic triad in Culp6 confirmed that each was essential for activity toward all fatty acid chain lengths of nitrophenyl esters and lipolytic function. Culp1 and Culp2 were present only in culture supernatants of M. tuberculosis, while Culp6, which is putatively essential for mycobacterial growth, was retained in the cell wall, suggesting the proteins play distinct roles in mycobacterial biology.
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Affiliation(s)
- Nicholas P West
- Mycobacterial Research Program, Centenary Institute of Cancer Medicine and Cell Biology, Locked Bag 6, Newtown, NSW, 2042, Australia.
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Xie G, Liu M, Zhu H, Lei B. Esterase SeE of Streptococcus equi ssp. equi is a novel nonspecific carboxylic ester hydrolase. FEMS Microbiol Lett 2009; 289:181-6. [PMID: 19054107 DOI: 10.1111/j.1574-6968.2008.01377.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Extracellular carboxylic ester hydrolases are produced by many bacterial pathogens and have been shown recently to be important for virulence of some pathogens. However, these hydrolases are poorly characterized in enzymatic activity. This study prepared and characterized the secreted ester hydrolase of Streptococcus equi ssp. equi (designated SeE for S. equi esterase). SeE hydrolyzes ethyl acetate, acetylsalicylic acid, and tributyrin but not ethyl butyrate. This substrate specificity pattern does not match those of the three conventional types of nonspecific carboxylic ester hydrolases (carboxylesterases, arylesterases, and acetylesterases). To determine whether SeE has lipase activity, a number of triglycerides and vinyl esters were tested in SeE-catalyzed hydrolysis. SeE does not hydrolyze triglycerides and vinyl esters of long-chain carboxylic acids nor display interfacial activation, indicating that SeE is not a lipase. Like the conventional carboxylesterases, SeE is inhibited by di-isopropylfluorophosphate. These findings indicate that SeE is a novel carboxylesterase with optimal activity for acetyl esters.
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Affiliation(s)
- Gang Xie
- Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717, USA
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Green fluorescent protein and factorial approach: An effective partnership for screening the soluble expression of recombinant proteins in Escherichia coli. Protein Expr Purif 2008; 61:184-90. [DOI: 10.1016/j.pep.2008.05.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2008] [Revised: 05/22/2008] [Accepted: 05/27/2008] [Indexed: 11/17/2022]
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Dherbécourt J, Falentin H, Canaan S, Thierry A. A genomic search approach to identify esterases in Propionibacterium freudenreichii involved in the formation of flavour in Emmental cheese. Microb Cell Fact 2008; 7:16. [PMID: 18498642 PMCID: PMC2442053 DOI: 10.1186/1475-2859-7-16] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Accepted: 05/22/2008] [Indexed: 11/25/2022] Open
Abstract
Background Lipolysis is an important process of cheese ripening that contributes to the formation of flavour. Propionibacterium freudenreichii is the main agent of lipolysis in Emmental cheese; however, the enzymes involved produced by this species have not yet been identified. Lipolysis is performed by esterases (carboxylic ester hydrolases, EC 3.1.1.-) which are able to hydrolyse acylglycerols bearing short, medium and long chain fatty acids. The genome sequence of P. freudenreichii type strain CIP103027T was recently obtained in our laboratory. The aim of this study was to identify as exhaustively as possible the potential esterases in P. freudenreichii that could be involved in the hydrolysis of acylglycerols in Emmental cheese. The proteins identified were produced in a soluble and active form by heterologous expression in Escherichia coli for further study of their activity and specificity of hydrolysed substrates. Results The approach chosen was a genomic search approach that combined and compared four methods based on automatic and manual searches of homology and motifs among P. freudenreichii CIP103027T predicted proteins. Twenty-three putative esterases were identified in this step. Then a selection step permitted to focus the study on the 12 most probable esterases, according to the presence of the GXSXG motif of the α/β hydrolase fold family. The 12 corresponding coding sequences were cloned in expression vectors, containing soluble N-terminal fusion proteins. The best conditions to express each protein in a soluble form were found thanks to an expression screening, using an incomplete factorial experimental design. Eleven out of the 12 proteins were expressed in a soluble form in E. coli and six showed esterase activity on 1-naphthyl acetate and/or propionate, as demonstrated by a zymographic method. Conclusion We were able to demonstrate that our genomic search approach was efficient to identify esterases from the genome of a P. freudenreichii strain, more exhaustively than classical approaches. This study highlights the interest in using the automatic search of motifs, with the manual search of homology to previously characterised enzymes as a complementary method. Only further characterisations would permit the identification of the esterases of P. freudenreichii involved in the lipolysis in Emmental cheese.
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Affiliation(s)
- Julien Dherbécourt
- INRA, Agrocampus Rennes, UMR1253 Science et Technologie du Lait et de l'OEuf, F-35000 Rennes, France.
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Meier JL, Barrows-Yano T, Foley TL, Wike CL, Burkart MD. The unusual macrocycle forming thioesterase of mycolactone. MOLECULAR BIOSYSTEMS 2008; 4:663-71. [PMID: 18493665 DOI: 10.1039/b801397g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mycolactone is a polyketide natural product secreted by Mycobacterium ulcerans, the organism responsible for the tropical skin disease Buruli ulcer. The finding that this small molecule virulence factor is sufficient to reconstitute the necrotic pathology associated with Buruli ulcer suggests that a better understanding of mycolactone biosynthesis, particularly the processes which are distinct from those in human metabolism, may provide a unique avenue for the development of selective therapeutics. In the present study we have cloned, expressed, and biochemically characterized the putative macrocycle forming thioesterase for mycolactone, MLSA2 TE. We have evaluated the enzyme both as the truncated thioesterase domain and as a carrier protein-linked didomain construct. The results of these analyses distinguish MLSA2 TE from traditional fatty acid and polyketide synthase TE-domains in terms of its sequence, kinetic parameters, and susceptibility to traditional active-site directed inhibitors. These findings suggest that MLSA2 TE utilizes a unique biochemical mechanism for macrocycle formation.
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Affiliation(s)
- Jordan L Meier
- Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA
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50
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Lipolytic enzymes in Mycobacterium tuberculosis. Appl Microbiol Biotechnol 2008; 78:741-9. [PMID: 18309478 DOI: 10.1007/s00253-008-1397-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2007] [Revised: 02/04/2008] [Accepted: 02/05/2008] [Indexed: 10/22/2022]
Abstract
Mycobacterium tuberculosis is a bacterial pathogen that can persist for decades in an infected patient without causing a disease. In vivo, the tubercle bacillus present in the lungs store triacylglycerols in inclusion bodies. The same process can be observed in vitro when the bacteria infect adipose tissues. Indeed, before entering in the dormant state, bacteria accumulate lipids originating from the host cell membrane degradation and from de novo synthesis. During the reactivation phase, these lipids are hydrolysed and the infection process occurs. The degradation of both extra and intracellular lipids can be directly related to the presence of lipolytic enzymes in mycobacteria, which have been ignored during a long period particularly due to the difficulties to obtain a high expression level of these enzymes in M. tuberculosis. The completion of the M. tuberculosis genome offered new opportunity to this kind of study. The aim of this review is to focus on the recent results obtained in the field of mycobacterium lipolytic enzymes and although no experimental proof has been shown in vivo, it is tempting to speculate that these enzymes could be involved in the virulence and pathogenicity processes.
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