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Abera B, Melaku Y, Shenkute K, Degu S, Abebe A, Gemechu W, Endale M, Woldemariam M, Hunsen M, Hussein AA, Dekebo A. In vitro antibacterial and antioxidant activity of flavonoids from the roots of Tephrosia vogelii: a combined experimental and computational study. Z NATURFORSCH C 2024; 0:znc-2024-0044. [PMID: 38865441 DOI: 10.1515/znc-2024-0044] [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: 02/26/2024] [Accepted: 05/23/2024] [Indexed: 06/14/2024]
Abstract
Tephrosia vogelii is a traditional medicinal plant used to treat hypertension, diarrhea and urinary disorders. Silica gel chromatographic separation of CH2Cl2/MeOH (1:1) roots extract of T. vogelii afforded seven compounds namely; β-sitosterol (1a), stigmasterol (1b), 6a, 12a-dehydro-deguelin (2), tephrosin (3), maackiain (4), obovatin (5) and 6-oxo, 6a, 12a-dehydro-deguelin (6). GC-MS analysis of essential oils from the root of T. vogelii displayed a total of 17 compounds of which cis-nerolidol (41.7 %) and cadinol (19.7 %) were the major constituents. CH2Cl2/MeOH (1:1) extract, MeOH extract, maackiain (4) and obovatin (5) showed moderate inhibitory activity against Pseudomonas aeruginosa with MIC value of 0.5, 0.66, 0.83 and 0.83 mg/mL, respectively, compared to ciprofloxacin (MIC of 0.078 μg/mL). 6a, 12a-dihydro-deguelin (2), and 6-oxo, 6a, 12a-dehydro-deguelin (6) displayed significant activity against S. epidermis with MIC values of 0.66 mg/mL. Tephrosin (3) and maackiain (4) also showed moderate antibacterial activity against Staphylococcus aureus and Proteus mirabilis with MIC values of 0.83 and 0.5 mg/mL, respectively, compared to ciprofloxacin (0.312 μg/mL). The radical scavenging activity results indicated that tephrosin (3), obovatin (5) and 6-oxo, 6a, 12a-dehydro-deguelin (6) showed potent DPPH scavenging activity with IC50 values of 10.97, 10.43 and 10.73 μg/mL, respectively, compared to ascorbic acid (IC50 of 5.83 μg/mL). The docking prediction results revealed that 6a, 12a-dehydro-deguelin (2) displayed the best binding energy of -8.1 kcal/mol towards pyruvate kinase of S. aureus (PDB ID: 3T07) and -7.9 kcal/mol towards P. mirabilis urease (PDB ID: 1E9Y) and DNA gyrase B of Escherichia coli (PDB: 4F86) receptors compared to ciprofloxacin (-7.2 to -8.0 kcal/mol). Maackiain (4) and obovatin (5) displayed the minimum binding energy of -7.9 and -8.2 kcal/mol towards the LasR protein of P. aeruginosa (PDB: ID 2UV) and S. epidermidis FtsZ (PDB: ID 4M8I), respectively. The SwissADME drug-likeness and Pro Tox II toxicity prediction results indicated that compounds (2-6) obeyed Lipinski's rule of five with 0 violations and none of them were found to be hepatotoxic, mutagenic, and cytotoxic, respectively. The in vitro assessment results supported by the in silico analysis revealed that crude extracts and isolated compounds showed promising antibacterial and antioxidant activity, which proves the therapeutic potential of the roots of T. vogelii.
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Affiliation(s)
- Bihon Abera
- Department of Applied Chemistry, 125545 School of Applied Natural Science, Adama Science and Technology University , P.O.Box 1888, Adama, Ethiopia
| | - Yadessa Melaku
- Department of Applied Chemistry, 125545 School of Applied Natural Science, Adama Science and Technology University , P.O.Box 1888, Adama, Ethiopia
| | - Kebede Shenkute
- Department of Applied Chemistry, 125545 School of Applied Natural Science, Adama Science and Technology University , P.O.Box 1888, Adama, Ethiopia
| | - Sileshi Degu
- Traditional and Modern Medicine Research and Development, 70605 Armauer Hansen Research Institute , P.O. Box 1005, Addis Ababa, Ethiopia
| | - Abiy Abebe
- Traditional and Modern Medicine Research and Development, 70605 Armauer Hansen Research Institute , P.O. Box 1005, Addis Ababa, Ethiopia
| | - Worku Gemechu
- Traditional and Modern Medicine Research and Development, 70605 Armauer Hansen Research Institute , P.O. Box 1005, Addis Ababa, Ethiopia
| | - Milkyas Endale
- Traditional and Modern Medicine Research and Development, 70605 Armauer Hansen Research Institute , P.O. Box 1005, Addis Ababa, Ethiopia
| | - Messay Woldemariam
- Pharmaceutical Industry Development, 70605 Armauer Hansen Research Institute , P.O. Box 1005, Addis Ababa, Ethiopia
| | - Mo Hunsen
- Department of Chemistry, 3475 Kenyon College , Gambier, OH 43022, USA
| | - Ahmed A Hussein
- Department of Chemistry, 70683 Cape Peninsula University of Technology , Bellville Campus, 7535, Bellville, Western Cape, South Africa
| | - Aman Dekebo
- Department of Applied Chemistry, 125545 School of Applied Natural Science, Adama Science and Technology University , P.O.Box 1888, Adama, Ethiopia
- 125545 Institute of Pharmaceutical Sciences, Adama Science and Technology University , P.O.Box 1888, Adama, Ethiopia
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Assefa T, Tesso H, Ramachandran VP, Guta L, Demissie TB, Ombito JO, Eswaramoorthy R, Melaku Y. In Silico Molecular Docking Analysis, Cytotoxicity, and Antibacterial Activities of Constituents of Fruits of Cucumis dipsaceus. ACS OMEGA 2024; 9:1945-1955. [PMID: 38222496 PMCID: PMC10785779 DOI: 10.1021/acsomega.3c08866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 01/16/2024]
Abstract
Cucumis dipsaceus (Cucurbitaceae) is a plant traditionally used against diarrhea, teeth-ach, wounds, stomach ache, meningitis, and cancer. The extracts of C. dipsaceus after silica gel column chromatography gave nine compounds identified using spectroscopic methods such as hexacosane (1), octadecane (2), 17-(-5-ethyl-2,6-dihydroxy-6-methylhept-3-en-2-yl)-9-(hydroxymethyl)-13-methylcyclopenta[α]phenanthren-3-ol (3), erythrodiol (4), (9,12)-propyl icosa-9,12-dienoate (5), α-spinasterol (6), 16-dehydroxycucurbitacin (7), cucurbitacin D (8), and 23,24-dihydroisocucurbitacin D (9). Compounds 3 and 4 are new to the genus Cucumis. α-Spinasterol showed better inhibition zone diameter = 13.67 ± 0.57, 15.00 ± 0.10, and 13.33 ± 0.57 mm against Escherichia coli, Pseudomonas aeruginosa, and Streptococcus pyogenes compared with the other tested samples. α-Spinasterol (-8.0 kcal/mol) and 3 (-7.6 kcal/mol) displayed high binding affinity against DNA Gyrase compared to ciprofloxacin (-7.3 kcal/mol). α-Spinasterol and 16-dehydroxycucurbitacin showed better binding affinity against protein kinase. The cytotoxicity results revealed that the EtOAc extract showed the highest potency with IC50 = 16.05 μg/mL. 16-Dehydroxycucurbitacin showed a higher binding affinity (-7.7 kcal/mol) against human topoisomerase IIβ than etoposide. The cytotoxicity and antibacterial activities and in silico molecular docking analysis displayed by the constituents corroborate the traditional use of the plant against bacteria and cancer.
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Affiliation(s)
- Teshale Assefa
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
| | - Hailemichael Tesso
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
| | | | - Leta Guta
- Department
of Applied Biology, Adama Science and Technology
University, P.O. Box, Adama 1888, Ethiopia
| | - Taye B. Demissie
- Department
of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
| | - Japheth O. Ombito
- Department
of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
| | - Rajalakshmanan Eswaramoorthy
- Department
of Biomaterials, S Aveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences
(SIMATS), Saveetha University, Chennai 600 077, India
| | - Yadessa Melaku
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
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Faleye OS, Boya BR, Lee JH, Choi I, Lee J. Halogenated Antimicrobial Agents to Combat Drug-Resistant Pathogens. Pharmacol Rev 2023; 76:90-141. [PMID: 37845080 DOI: 10.1124/pharmrev.123.000863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 08/07/2023] [Accepted: 09/29/2023] [Indexed: 10/18/2023] Open
Abstract
Antimicrobial resistance presents us with a potential global crisis as it undermines the abilities of conventional antibiotics to combat pathogenic microbes. The history of antimicrobial agents is replete with examples of scaffolds containing halogens. In this review, we discuss the impacts of halogen atoms in various antibiotic types and antimicrobial scaffolds and their modes of action, structure-activity relationships, and the contributions of halogen atoms in antimicrobial activity and drug resistance. Other halogenated molecules, including carbohydrates, peptides, lipids, and polymeric complexes, are also reviewed, and the effects of halogenated scaffolds on pharmacokinetics, pharmacodynamics, and factors affecting antimicrobial and antivirulence activities are presented. Furthermore, the potential of halogenation to circumvent antimicrobial resistance and rejuvenate impotent antibiotics is addressed. This review provides an overview of the significance of halogenation, the abilities of halogens to interact in biomolecular settings and enhance pharmacological properties, and their potential therapeutic usages in preventing a postantibiotic era. SIGNIFICANCE STATEMENT: Antimicrobial resistance and the increasing impotence of antibiotics are critical threats to global health. The roles and importance of halogen atoms in antimicrobial drug scaffolds have been established, but comparatively little is known of their pharmacological impacts on drug resistance and antivirulence activities. This review is the first to extensively evaluate the roles of halogen atoms in various antibiotic classes and pharmacological scaffolds and to provide an overview of their ability to overcome antimicrobial resistance.
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Affiliation(s)
- Olajide Sunday Faleye
- School of Chemical Engineering (O.S.F., B.R.B., J.-H.L., J.L.) and Department of Medical Biotechnology (I.C.), Yeungnam University, Gyeongsan, Republic of Korea
| | - Bharath Reddy Boya
- School of Chemical Engineering (O.S.F., B.R.B., J.-H.L., J.L.) and Department of Medical Biotechnology (I.C.), Yeungnam University, Gyeongsan, Republic of Korea
| | - Jin-Hyung Lee
- School of Chemical Engineering (O.S.F., B.R.B., J.-H.L., J.L.) and Department of Medical Biotechnology (I.C.), Yeungnam University, Gyeongsan, Republic of Korea
| | - Inho Choi
- School of Chemical Engineering (O.S.F., B.R.B., J.-H.L., J.L.) and Department of Medical Biotechnology (I.C.), Yeungnam University, Gyeongsan, Republic of Korea
| | - Jintae Lee
- School of Chemical Engineering (O.S.F., B.R.B., J.-H.L., J.L.) and Department of Medical Biotechnology (I.C.), Yeungnam University, Gyeongsan, Republic of Korea
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Pereira AFM, Sani AA, Zapata TB, de Sousa DSM, Rossini BC, dos Santos LD, Rall VLM, Riccardi CDS, Fernandes Júnior A. Synergistic Antibacterial Efficacy of Melittin in Combination with Oxacillin against Methicillin-Resistant Staphylococcus aureus (MRSA). Microorganisms 2023; 11:2868. [PMID: 38138012 PMCID: PMC10745785 DOI: 10.3390/microorganisms11122868] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/17/2023] [Accepted: 11/20/2023] [Indexed: 12/24/2023] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) often cause infections with high mortality rates. Antimicrobial peptides are a source of molecules for developing antimicrobials; one such peptide is melittin, a fraction from the venom of the Apis mellifera bee. This study aimed to evaluate the antibacterial and antibiofilm activities of melittin and its association with oxacillin (mel+oxa) against MRSA isolates, and to investigate the mechanisms of action of the treatments on MRSA. Minimum inhibitory concentrations (MICs) were determined, and synergistic effects of melittin with oxacillin and cephalothin were assessed. Antibiofilm and cytotoxic activities, as well as their impact on the cell membrane, were evaluated for melittin, oxacillin, and mel+oxa. Proteomics evaluated the effects of the treatments on MRSA. Melittin mean MICs for MRSA was 4.7 μg/mL and 12 μg/mL for oxacillin. Mel+oxa exhibited synergistic effects, reducing biofilm formation, and causing leakage of proteins, nucleic acids, potassium, and phosphate ions, indicating action on cell membrane. Melittin and mel+oxa, at MIC values, did not induce hemolysis and apoptosis in HaCaT cells. The treatments resulted in differential expression of proteins associated with protein synthesis and energy metabolism. Mel+oxa demonstrated antibacterial activity against MRSA, suggesting a potential as a candidate for the development of new antibacterial agents against MRSA.
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Affiliation(s)
- Ana Flávia Marques Pereira
- The Center for the Study of Venoms and Venomous Animals of UNESP (CEVAP), São Paulo State University (UNESP), Botucatu 18619-002, São Paulo, Brazil;
| | - Alessandra Aguirra Sani
- Department of Chemical and Biological Sciences, Microbiology and Immunology Sector, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu 18618-689, São Paulo, Brazil; (A.A.S.); (T.B.Z.); (D.S.M.d.S.); (V.L.M.R.)
| | - Tatiane Baptista Zapata
- Department of Chemical and Biological Sciences, Microbiology and Immunology Sector, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu 18618-689, São Paulo, Brazil; (A.A.S.); (T.B.Z.); (D.S.M.d.S.); (V.L.M.R.)
| | - Débora Silva Marques de Sousa
- Department of Chemical and Biological Sciences, Microbiology and Immunology Sector, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu 18618-689, São Paulo, Brazil; (A.A.S.); (T.B.Z.); (D.S.M.d.S.); (V.L.M.R.)
| | - Bruno César Rossini
- Institute of Biotechnology (IBTEC), São Paulo State University (UNESP), Botucatu 18607-440, São Paulo, Brazil; (B.C.R.); (L.D.d.S.)
| | - Lucilene Delazari dos Santos
- Institute of Biotechnology (IBTEC), São Paulo State University (UNESP), Botucatu 18607-440, São Paulo, Brazil; (B.C.R.); (L.D.d.S.)
- Graduate Program in Tropical Diseases and Graduate Program in Research and Development (Medical Biotechnology), Botucatu Medical School (FMB), São Paulo State University (UNESP), Botucatu 18618-687, São Paulo, Brazil
| | - Vera Lúcia Mores Rall
- Department of Chemical and Biological Sciences, Microbiology and Immunology Sector, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu 18618-689, São Paulo, Brazil; (A.A.S.); (T.B.Z.); (D.S.M.d.S.); (V.L.M.R.)
| | - Carla dos Santos Riccardi
- Department of Bioprocesses and Biotechnology, Faculty of Agricultural Sciences (FCA), São Paulo State University (UNESP), Botucatu 18610-034, São Paulo, Brazil;
| | - Ary Fernandes Júnior
- Department of Chemical and Biological Sciences, Microbiology and Immunology Sector, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu 18618-689, São Paulo, Brazil; (A.A.S.); (T.B.Z.); (D.S.M.d.S.); (V.L.M.R.)
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Suthi S, Mounika A, Potukuchi VGKS. Elevated acetate kinase (ackA) gene expression, activity, and biofilm formation observed in methicillin-resistant strains of Staphylococcus aureus (MRSA). J Genet Eng Biotechnol 2023; 21:100. [PMID: 37831271 PMCID: PMC10575836 DOI: 10.1186/s43141-023-00555-0] [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: 10/21/2022] [Accepted: 09/20/2023] [Indexed: 10/14/2023]
Abstract
BACKGROUND Staphylococcus aureus spreads its infections through biofilms. This usually happens in the stationary phase of S. aureus growth where it utilizes accumulated acetate as a carbon source via the phosphotrans-acetylase-acetate kinase (Pta-Ack) pathway. In which acetate kinase (ackA) catalyzes the substrate-level phosphorylation, a vital secondary energy-yielding pathway that promotes biofilms formation aids bacterium survival in hostile environments. In this study, we describe the cloning, sequencing, and expression of S. aureus ackA gene. The expression analysis of ackA gene in methicillin-resistant strains of S. aureus (MRSA) correlates with ackA activity and biofilm units. The uniqueness of ackA was analyzed by using in silico methods. RESULTS Elevated ackA gene expression was observed in MRSA strains, which correlates with increased ackA activity and biofilm units, explaining ackA role in MRSA growth and pathogenicity. The pure recombinant acetate kinase showed a molecular weight of 44 kDa, with enzyme activity of 3.35 ± 0.05 μM/ml/min. The presence of ACKA-1, ACKA-2 sites, one ATP, and five serine/threonine-protein kinase sites in the ackA gene (KC954623.1) indicated that acetyl phosphate production is strongly controlled. The comparative structural analysis of S. aureus ackA with ackA structures of Mycobacterium avium (3P4I) and Salmonella typhimurium (3SLC) exhibited variations as indicated by the RMSD values 1.877 Å and 2.141 Å respectively, explaining why ackA functions are differently placed in bacteria, concurring its involvement in S. aureus pathogenesis. CONCLUSIONS Overall findings of this study highlight the correlation of ackA expression profoundly increases survival capacity through biofilm formation, which is a pathogenic factor in MRSA and plays a pivotal role in infection spreading.
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Affiliation(s)
- Subbarayudu Suthi
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Alipiri Road, Tirupati, 517501, Andhra Pradesh, India
| | - A Mounika
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Alipiri Road, Tirupati, 517501, Andhra Pradesh, India
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Gonçalves LG, Santos S, Gomes LP, Armengaud J, Miragaia M, Coelho AV. Skin-to-blood pH shift triggers metabolome and proteome global remodelling in Staphylococcus epidermidis. Front Microbiol 2022; 13:1000737. [PMID: 36246270 PMCID: PMC9554481 DOI: 10.3389/fmicb.2022.1000737] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
Staphylococcus epidermidis is one of the most common bacteria of the human skin microbiota. Despite its role as a commensal, S. epidermidis has emerged as an opportunistic pathogen, associated with 80% of medical devices related infections. Moreover, these bacteria are extremely difficult to treat due to their ability to form biofilms and accumulate resistance to almost all classes of antimicrobials. Thus new preventive and therapeutic strategies are urgently needed. However, the molecular mechanisms associated with S. epidermidis colonisation and disease are still poorly understood. A deeper understanding of the metabolic and cellular processes associated with response to environmental factors characteristic of SE ecological niches in health and disease might provide new clues on colonisation and disease processes. Here we studied the impact of pH conditions, mimicking the skin pH (5.5) and blood pH (7.4), in a S. epidermidis commensal strain by means of next-generation proteomics and 1H NMR-based metabolomics. Moreover, we evaluated the metabolic changes occurring during a sudden pH change, simulating the skin barrier break produced by a catheter. We found that exposure of S. epidermidis to skin pH induced oxidative phosphorylation and biosynthesis of peptidoglycan, lipoteichoic acids and betaine. In contrast, at blood pH, the bacterial assimilation of monosaccharides and its oxidation by glycolysis and fermentation was promoted. Additionally, several proteins related to virulence and immune evasion, namely extracellular proteases and membrane iron transporters were more abundant at blood pH. In the situation of an abrupt skin-to-blood pH shift we observed the decrease in the osmolyte betaine and changes in the levels of several metabolites and proteins involved in cellular redoxl homeostasis. Our results suggest that at the skin pH S. epidermidis cells are metabolically more active and adhesion is promoted, while at blood pH, metabolism is tuned down and cells have a more virulent profile. pH increase during commensal-to-pathogen conversion appears to be a critical environmental signal to the remodelling of the S. epidermidis metabolism toward a more pathogenic state. Targeting S. epidermidis proteins induced by pH 7.4 and promoting the acidification of the medical device surface or surrounding environment might be new strategies to treat and prevent S. epidermidis infections.
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Affiliation(s)
- Luis Gafeira Gonçalves
- Laboratory of Proteomics of Non-Model Organisms, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Susana Santos
- Laboratory of Proteomics of Non-Model Organisms, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Laidson Paes Gomes
- Laboratory of Proteomics of Non-Model Organisms, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Jean Armengaud
- Département Médicaments et Technologies pour la Santé, SPI, Université Paris-Saclay, CEA, INRAE, Bagnols-sur-Cèze, France
| | - Maria Miragaia
- Laboratory of Bacterial Evolution and Molecular Epidemiology, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
- *Correspondence: Maria Miragaia,
| | - Ana Varela Coelho
- Laboratory of Proteomics of Non-Model Organisms, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
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Akunuri R, Unnissa T, Vadakattu M, Bujji S, Mahammad Ghouse S, Madhavi Yaddanapudi V, Chopra S, Nanduri S. Bacterial Pyruvate Kinase: A New Potential Target to Combat Drug‐Resistant
Staphylococcus aureus
Infections. ChemistrySelect 2022. [DOI: 10.1002/slct.202201403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ravikumar Akunuri
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Tanveer Unnissa
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Manasa Vadakattu
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Sushmitha Bujji
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Shaik Mahammad Ghouse
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Venkata Madhavi Yaddanapudi
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
| | - Sidharth Chopra
- Division of Molecular Microbiology and Immunology CSIR-Central Drug Research Institute (CDRI) Sitapur Road, Sector 10, Janakipuram Extension Lucknow 226 031, Uttar Pradesh India
| | - Srinivas Nanduri
- Department of Chemical Sciences National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500 037, Telangana State India
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Czajkowska J, Junka A, Hoppe J, Toporkiewicz M, Pawlak A, Migdał P, Oleksy-Wawrzyniak M, Fijałkowski K, Śmiglak M, Markowska-Szczupak A. The Co-Culture of Staphylococcal Biofilm and Fibroblast Cell Line: The Correlation of Biological Phenomena with Metabolic NMR 1 Footprint. Int J Mol Sci 2021; 22:ijms22115826. [PMID: 34072418 PMCID: PMC8198359 DOI: 10.3390/ijms22115826] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 05/24/2021] [Accepted: 05/27/2021] [Indexed: 12/19/2022] Open
Abstract
Staphylococcus aureus is one of the most prevalent pathogens associated with several types of biofilm-based infections, including infections of chronic wounds. Mature staphylococcal biofilm is extremely hard to eradicate from a wound and displays a high tendency to induce recurring infections. Therefore, in the present study, we aimed to investigate in vitro the interaction between S. aureus biofilm and fibroblast cells searching for metabolites that could be considered as potential biomarkers of critical colonization and infection. Utilizing advanced microscopy and microbiological methods to examine biofilm formation and the staphylococcal infection process, we were able to distinguish 4 phases of biofilm development. The analysis of staphylococcal biofilm influence on the viability of fibroblasts allowed us to pinpoint the moment of critical colonization-12 h post contamination. Based on the obtained model we performed a metabolomics analysis by 1H NMR spectroscopy to provide new insights into the pathophysiology of infection. We identified a set of metabolites related to the switch to anaerobic metabolism that was characteristic for staphylococcal biofilm co-cultured with fibroblast cells. The data presented in this study may be thus considered a noteworthy but preliminary step in the direction of developing a new, NMR-based tool for rapid diagnosing of infection in a chronic wound.
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Affiliation(s)
- Joanna Czajkowska
- Laboratory of Microbiology, Łukasiewicz Research Network–PORT Polish Center for Technology Development, 54-066 Wrocław, Poland;
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, 71-065 Szczecin, Poland; (M.O.-W.); (A.M.-S.)
| | - Adam Junka
- Laboratory of Microbiology, Łukasiewicz Research Network–PORT Polish Center for Technology Development, 54-066 Wrocław, Poland;
- Department of Pharmaceutical Microbiology and Parasitology, Faculty of Pharmacy Wrocław Medical University, 50-556 Wrocław, Poland
- Correspondence: ; Tel.: +48-889-229-341
| | - Jakub Hoppe
- Poznan Science and Technology Park (PPNT), Rubiez 5, 61-612 Poznań, Poland; (J.H.); (M.Ś.)
| | - Monika Toporkiewicz
- Bioimaging Laboratory, Łukasiewicz Research Network—PORT Polish Center for Technology Development, 54-066 Wrocław, Poland;
| | - Andrzej Pawlak
- Department of Nervous System Diseases, Kazimierza Bartla 5, 50-996 Wrocław, Poland;
| | - Paweł Migdał
- Department of Environment Hygiene and Animal Welfare, Wroclaw University of Environmental and Life Sciences, 51-630 Wroclaw, Poland;
| | - Monika Oleksy-Wawrzyniak
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, 71-065 Szczecin, Poland; (M.O.-W.); (A.M.-S.)
| | - Karol Fijałkowski
- Department of Microbiology and Biotechnology, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, 70-311 Szczecin, Poland;
| | - Marcin Śmiglak
- Poznan Science and Technology Park (PPNT), Rubiez 5, 61-612 Poznań, Poland; (J.H.); (M.Ś.)
| | - Agata Markowska-Szczupak
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, 71-065 Szczecin, Poland; (M.O.-W.); (A.M.-S.)
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Jia J, Luo Y, Zhong X, He L. Methicillin-resistance Staphylococcus aureus (MRSA) Pyruvate kinase (PK) inhibitors and Their Antimicrobial Activities. Curr Med Chem 2021; 29:908-923. [PMID: 33749550 DOI: 10.2174/0929867328666210322103340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 02/10/2021] [Accepted: 02/14/2021] [Indexed: 11/22/2022]
Abstract
Resistance to antibiotics has been widely existed in the health care and community setting, thus developing a novel aspect of new antibiotics is urgently necessary. Methicillin-resistance Staphylococcus aureus (MRSA) Pyruvate kinase (PK) is crucial to the survive of bacterial, making it a novel antimicrobial target. In the past decade, most reported PK inhibitors including indole, flavonoid, phenazine derivative from natural product small molecules or their analogues, or virtual screening from small molecule compound library. This review covers the PK inhibitors and their antimicrobial activities reported from the beginning of 2011 through the middle of 2020. The Structure Activity Relationships (SARs) was discussed briefly as well.
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Affiliation(s)
- Jingjing Jia
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041. China
| | - Yang Luo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041. China
| | - Xue Zhong
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041. China
| | - Ling He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041. China
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10
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Vudhya Gowrisankar Y, Manne Mudhu S, Pasupuleti SK, Suthi S, Chaudhury A, Sarma PVGK. Staphylococcus aureus grown in anaerobic conditions exhibits elevated glutamine biosynthesis and biofilm units. Can J Microbiol 2020; 67:323-331. [PMID: 33136443 DOI: 10.1139/cjm-2020-0434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The enormous spread of Staphylococcus aureus infections through biofilms is a major concern in hospital-acquired infections. Biofilm formation by S. aureus on any surface is facilitated by adjusting its redox status. This organism is a facultative anaerobe shift more towards reductive conditions by enhancing nitrogen metabolism where glutamine synthesis plays a key role. Glutamine is synthesized by glutamine synthetase (GS) encoded by the glnA gene. The gene was amplified by PCR from the chromosomal DNA of S. aureus, sequenced (HQ329146.1), and cloned. The pure recombinant GS exhibited Km of 11.06 ± 0.05 mmol·L-1 for glutamate and 2.4 ± 0.03 mmol·L-1 for ATP. The glnA gene sequence showed a high degree of variability with its human counterpart, while it was highly conserved in bacteria. Structural analysis revealed that the GS structure of S. aureus showed close homology with other Gram-positive bacteria and exhibited a high degree of variation with Escherichia coli GS. In the present study, we observed the increased presence of GS activity in multidrug-resistant strains of S. aureus with elevated biofilm units, grown in brain heart infusion broth; among them methicillin-resistant strains S. aureus LMV 3, 4, and 5 showed higher biofilm units. All these results explain the important role of glutamine biosynthesis with elevated biofilm units in the pathogenesis of S. aureus.
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Affiliation(s)
- Yugandhar Vudhya Gowrisankar
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517507, Andhra Pradesh, India.,Department of Cosmeceutics, College of Pharmacy, China Medical University, Taichung 40402, Taiwan (Republic of China)
| | - Sunitha Manne Mudhu
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517507, Andhra Pradesh, India
| | - Santhosh Kumar Pasupuleti
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517507, Andhra Pradesh, India.,Department of Pediatrics, Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, 1044 West Walnut Street, Indianapolis, IN 46202, USA
| | - Subbarayudu Suthi
- Microbial Genetics Laboratory, Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517507, Andhra Pradesh, India
| | - Abhijit Chaudhury
- Department of Microbiology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517507, Andhra Pradesh, India
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S. Hifnawy M, Hassan HM, Mohammed R, M. Fouda M, Sayed AM, A. Hamed A, F. AbouZid S, Rateb ME, Alhadrami HA, Abdelmohsen UR. Induction of Antibacterial Metabolites by Co-Cultivation of Two Red-Sea-Sponge-Associated Actinomycetes Micromonospora sp. UR56 and Actinokinespora sp. EG49. Mar Drugs 2020; 18:md18050243. [PMID: 32380771 PMCID: PMC7281614 DOI: 10.3390/md18050243] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/23/2020] [Accepted: 04/30/2020] [Indexed: 02/07/2023] Open
Abstract
Liquid chromatography coupled with high resolution mass spectrometry (LC-HRESMS)-assisted metabolomic profiling of two sponge-associated actinomycetes, Micromonospora sp. UR56 and Actinokineospora sp. EG49, revealed that the co-culture of these two actinomycetes induced the accumulation of metabolites that were not traced in their axenic cultures. Dereplication suggested that phenazine-derived compounds were the main induced metabolites. Hence, following large-scale co-fermentation, the major induced metabolites were isolated and structurally characterized as the already known dimethyl phenazine-1,6-dicarboxylate (1), phenazine-1,6-dicarboxylic acid mono methyl ester (phencomycin; 2), phenazine-1-carboxylic acid (tubermycin; 3), N-(2-hydroxyphenyl)-acetamide (9), and p-anisamide (10). Subsequently, the antibacterial, antibiofilm, and cytotoxic properties of these metabolites (1–3, 9, and 10) were determined in vitro. All the tested compounds except 9 showed high to moderate antibacterial and antibiofilm activities, whereas their cytotoxic effects were modest. Testing against Staphylococcus DNA gyrase-B and pyruvate kinase as possible molecular targets together with binding mode studies showed that compounds 1–3 could exert their bacterial inhibitory activities through the inhibition of both enzymes. Moreover, their structural differences, particularly the substitution at C-1 and C-6, played a crucial role in the determination of their inhibitory spectra and potency. In conclusion, the present study highlighted that microbial co-cultivation is an efficient tool for the discovery of new antimicrobial candidates and indicated phenazines as potential lead compounds for further development as antibiotic scaffold.
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Affiliation(s)
- Mohamed S. Hifnawy
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, 11787 Cairo, Egypt;
| | - Hossam M. Hassan
- Department of Pharmacognosy, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt; (H.M.H.); (R.M.); (S.F.A.)
| | - Rabab Mohammed
- Department of Pharmacognosy, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt; (H.M.H.); (R.M.); (S.F.A.)
| | - Mohamed M. Fouda
- Department of Pharmacognosy, Faculty of Pharmacy, Nahda University, 62513 Beni-Suef, Egypt; (M.M.F.); (A.M.S.)
| | - Ahmed M. Sayed
- Department of Pharmacognosy, Faculty of Pharmacy, Nahda University, 62513 Beni-Suef, Egypt; (M.M.F.); (A.M.S.)
| | - Ahmed A. Hamed
- Microbial Chemistry Department, National Research Center, 33 El-Buhouth Street, 12622 Giza, Egypt;
| | - Sameh F. AbouZid
- Department of Pharmacognosy, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt; (H.M.H.); (R.M.); (S.F.A.)
| | - Mostafa E. Rateb
- School of Computing, Engineering & Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK;
| | - Hani A. Alhadrami
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Special Infectious Agent Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Correspondence: (H.A.A.); (U.R.A.)
| | - Usama Ramadan Abdelmohsen
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, Egypt
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, Universities Zone, P.O. Box 61111 New Minia City, Egypt
- Correspondence: (H.A.A.); (U.R.A.)
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12
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Discovery of Two Brominated Oxindole Alkaloids as Staphylococcal DNA Gyrase and Pyruvate Kinase Inhibitors via Inverse Virtual Screening. Microorganisms 2020; 8:microorganisms8020293. [PMID: 32093370 PMCID: PMC7074965 DOI: 10.3390/microorganisms8020293] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/15/2020] [Accepted: 02/17/2020] [Indexed: 12/14/2022] Open
Abstract
In the present study, a small marine-derived natural products library was assessed for antibacterial potential. Among 36 isolated compounds, a number of bis-indole derivatives exhibited growth-inhibitory activity towards Gram-positive strains (Bacillus subtilis and multidrug-resistant Staphylococcus aureus). 5- and 6-trisindoline (5-Tris and 6-Tris) were the most active derivatives (minimum inhibitory concentration, MIC, 4–8 µM) that were subsequently selected for anti-biofilm activity evaluation. Only 5-Tris was able to inhibit the staphylococcal biofilm formation starting at a 5 µM concentration. In order to investigate their possible molecular targets, both natural products were subjected to in silico inverse virtual screening. Among 20 target proteins, DNA gyrase and pyruvate kinase were the most likely to be involved in the observed antibacterial and anti-biofilm activities of both selected natural products. The in vitro validation and in silico binding mode studies revealed that 5-Tris could act as a dual enzyme inhibitor (IC50 11.4 ± 0.03 and 6.6 ± 0.05 µM, respectively), while 6-Tris was a low micromolar gyrase-B inhibitor (IC50 2.1 ± 0.08 µM), indicating that the bromine position plays a crucial role in the determination of the antibacterial lead compound inhibitory activity.
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Zhang M, Zhang X, Tong L, Ou D, Wang Y, Zhang J, Wu Q, Ye Y. Random Mutagenesis Applied to Reveal Factors Involved in Oxidative Tolerance and Biofilm Formation in Foodborne Cronobacter malonaticus. Front Microbiol 2019; 10:877. [PMID: 31118922 PMCID: PMC6504702 DOI: 10.3389/fmicb.2019.00877] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 04/05/2019] [Indexed: 12/16/2022] Open
Abstract
Cronobacter species are linked with life-treating diseases in neonates and show strong tolerances to environmental stress. However, the information about factors involved in oxidative tolerance in Cronobacter remains elusive. Here, factors involved in oxidative tolerance in C. malonaticus were identified using a transposon mutagenesis. Eight mutants were successfully screened based on a comparison of the growth of strains from mutant library (n = 215) and wild type (WT) strain under 1.0 mM H2O2. Mutating sites including thioredoxin 2, glutaredoxin 3, pantothenate kinase, serine/threonine protein kinase, pyruvate kinase, phospholipase A, ferrous iron transport protein A, and alanine racemase 2 were successfully identified by arbitrary PCR and sequencing alignment. Furthermore, the comparison about quantity and structure of biofilms formation among eight mutants and WT was determined using crystal violet staining (CVS), scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM). Results showed that the biofilms of eight mutants significantly decreased within 48 h compared to that of WT, suggesting that mutating genes play important roles in biofilm formation under oxidative stress. The findings provide valuable information for deeply understanding molecular mechanism about oxidative tolerance of C. malonaticus.
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Affiliation(s)
- Maofeng Zhang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China.,State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China
| | - Xiyan Zhang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China
| | - Liaowang Tong
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China
| | - Dexin Ou
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China
| | - Yaping Wang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China
| | - Jumei Zhang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China
| | - Qingping Wu
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China
| | - Yingwang Ye
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China.,State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China
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Lu J, Cui L, Lin S, Hao L, Cao N, Yi J, Liu X, Lu L, Kang Q. Short communication: Global transcriptome analysis of Lactococcus lactis ssp. lactis in response to gradient freezing. J Dairy Sci 2019; 102:3933-3938. [PMID: 30852017 DOI: 10.3168/jds.2018-15972] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 01/07/2019] [Indexed: 11/19/2022]
Abstract
Lactic acid bacteria are often preserved as starter cultures by freezing to extend shelf stability as well as maintain cell viability and acidification activity. Previous studies showed that the endocyte extracted from gradient-freezing pretreated cells could act as lyoprotectant in the lyophilization process of Lactococcus lactis ssp. lactis. In this study, the molecular mechanisms of L. lactis in response to gradient freezing exposure are described using high-throughput sequencing. Nineteen of 56 genes were upregulated after gradient freezing, whereas 37 genes were downregulated. Further validation results of quantitative real-time PCR experiments were consistent with the RNA sequencing. Gene Ontology (http://www.geneontology.org/) enrichment and Kyoto Encyclopedia of Genes and Genomes (KEGG; https://www.genome.jp/kegg/) pathway were used to analyze the differentially expressed genes. Several pathways, such as glutathione metabolism, ATP-binding cassette transport, metabolism of cell wall and cell membrane components, and stress response-related pathways, were affected by gradient freezing. Six genes relevant to freezing stress response were selected for quantitative real-time PCR, including 3 upregulated genes (hisK, eutD, dukA) and 3 downregulated genes (als, yedF, pepN). The Gene Ontology enrichment and KEGG pathway analyses showed these genes may influence stress response-related pathways, improving the survival of the L. lactis under freezing stress. The identification of these genes deepened an understanding about their response under freezing stress, helping us find potential genes or pathways related to gradient freezing for further research on lyoprotectants.
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Affiliation(s)
- Jike Lu
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China.
| | - Lianming Cui
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Songyang Lin
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Limin Hao
- The Quartermaster Equipment Institute, Academy of Military Sciences PLA China, Beijing 100010, China
| | - Nana Cao
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Juanjuan Yi
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Xin Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Laizheng Lu
- Zhengzhou Mindtek Biotechnology Co. Ltd., Zhengzhou, Henan 450001, China
| | - Qiaozhen Kang
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China.
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Pensinger DA, Schaenzer AJ, Sauer JD. Do Shoot the Messenger: PASTA Kinases as Virulence Determinants and Antibiotic Targets. Trends Microbiol 2017; 26:56-69. [PMID: 28734616 DOI: 10.1016/j.tim.2017.06.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/15/2017] [Accepted: 06/27/2017] [Indexed: 01/14/2023]
Abstract
All domains of life utilize protein phosphorylation as a mechanism of signal transduction. In bacteria, protein phosphorylation was classically thought to be mediated exclusively by histidine kinases as part of two-component signaling systems. However, it is now well appreciated that eukaryotic-like serine/threonine kinases (eSTKs) control essential processes in bacteria. A subset of eSTKs are single-pass transmembrane proteins that have extracellular penicillin-binding-protein and serine/threonine kinase-associated (PASTA) domains which bind muropeptides. In a variety of important pathogens, PASTA kinases have been implicated in regulating biofilms, antibiotic resistance, and ultimately virulence. Although there are limited examples of direct regulation of virulence factors, PASTA kinases are critical for virulence due to their roles in regulating bacterial physiology in the context of stress. This review focuses on the role of PASTA kinases in virulence for a variety of important Gram-positive pathogens and concludes with a discussion of current efforts to develop kinase inhibitors as novel antimicrobials.
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Affiliation(s)
- Daniel A Pensinger
- Microbiology Doctoral Training Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA; Department of Medical Microbiology and Immunology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Adam J Schaenzer
- Department of Medical Microbiology and Immunology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA; Molecular and Cellular Pharmacology Doctoral Training Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - John-Demian Sauer
- Microbiology Doctoral Training Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA; Department of Medical Microbiology and Immunology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA; Molecular and Cellular Pharmacology Doctoral Training Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA.
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Vasu D, Kumar PS, Prasad UV, Swarupa V, Yeswanth S, Srikanth L, Sunitha MM, Choudhary A, Sarma PVGK. Phosphorylation of Staphylococcus aureus Protein-Tyrosine Kinase Affects the Function of Glucokinase and Biofilm Formation. IRANIAN BIOMEDICAL JOURNAL 2016; 21:94-105. [PMID: 27695030 PMCID: PMC5274716 DOI: 10.18869/acadpub.ibj.21.2.94] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Background: When Staphylococcus aureus is grown in the presence of high concentration of external glucose, this sugar is phosphorylated by glucokinase (glkA) to form glucose-6-phosphate. This product subsequently enters into anabolic phase, which favors biofilm formation. The presence of ROK (repressor protein, open reading frame, sugar kinase) motif, phosphate-1 and -2 sites, and tyrosine kinase sites in glkA of S. aureus indicates that phosphorylation must regulate the glkA activity. The aim of the present study was to identify the effect of phosphorylation on the function of S. aureusglkA and biofilm formation. Methods: Pure glkA and protein-tyrosine kinase (BYK) of S. aureus ATCC 12600 were obtained by fractionating the cytosolic fractions of glkA1 and BYK-1 expressing recombinant clones through nickel metal chelate column. The pure glkA was used as a substrate for BYK, and the phosphorylation of glkA was confirmed by treating with reagent A and resolving in SDS-PAGE, as well as staining with reagent A. The kinetic parameters of glkA and phosphorylated glkA were determined spectrophotometrically, and in silico tools were used for validation. S. aureus was grown in brain heart infusion broth, which was supplemented with glucose, and then biofilm units were calculated. Results: Fourfold elevated glkA activity was observed upon the phosphorylation by BYK. Protein-protein docking analysis revealed that glkA structure docked close to the adenosine triphosphate-binding site of BYK structure corroborating the kinetic results. Further, S. aureus grown in the presence of elevated glucose concentration exhibited an increase in the rate of biofilm formation. Conclusion: The elevated function of glkA is an essential requirement for increased biofilm units in S. aureus, a key pathogenic factor that helps its survival and the progress of infection.
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Affiliation(s)
- Dudipeta Vasu
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Pasupuleti Santhosh Kumar
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Uppu Venkateswara Prasad
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Vimjam Swarupa
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Sthanikam Yeswanth
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Lokanathan Srikanth
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Manne Mudhu Sunitha
- Department of Biotechnology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
| | - Abhijith Choudhary
- Department of Microbiology, Sri Venkateswara Institute of Medical Sciences, Tirupati 517 507, Andhra Pradesh, India
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