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Mohseni Sani N, Talaee M, Akbari A, Ashoori F, Zamani J, Kermani AA, Shahbani Zahiri H, Presley J, Vali H, Akbari Noghabi K. Unveiling the structure-emulsifying function relationship of truncated recombinant forms of the SA01-OmpA protein opens up a new vista in bioemulsifiers. Microbiol Spectr 2024; 12:e0346523. [PMID: 38206002 PMCID: PMC10846152 DOI: 10.1128/spectrum.03465-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 12/03/2023] [Indexed: 01/12/2024] Open
Abstract
The emulsifying ability of SA01-OmpA (outer membrane protein A from Acinetobacter sp. SA01) was found to be constrained by challenges like low production efficiency and high costs associated with protein recovery from E. coli inclusion bodies, as described in our previous study. The present study sought to benefit from the advantages of the targeted truncating of SA01-OmpA protein, taking into account the reduced propensity of protein expression as inclusion bodies and cytotoxicity. Here, the structure and activity relationship of two truncated recombinant forms of SA01-OmpA protein was unraveled through a hybrid approach based on experimental data and computational methodologies, representing an innovative bioemulsifier with advantageous emulsifying activity. The recombinant truncated SA01-OmpA variants were cloned and heterologously expressed in E. coli host cells and subsequently purified. The results showed increased emulsifying activity of N-terminally truncated SA01-OmpA (NT-OmpA) compared to full-length SA01-OmpA. Molecular dynamics (MD) simulations analysis demonstrated a direct correlation between the C-terminally truncated SA01-OmpA (CT-OmpA) and its expression as inclusion bodies. Analysis of the structure-activity relationship of truncated variants of SA01-OmpA revealed that, compared to the full-length protein, deletion of the β-barrel portion from the N-terminal of SA01-OmpA increased the emulsifying activity of NT-OmpA while lowering its expression as inclusion bodies. Contrary to the full-length protein, the N-terminally truncated SA01-OmpA was not as cytotoxic, according to the MTT assay, FCM analysis, and AO/EB staining. The findings of this extensive study advance our knowledge of SA01-OmpA at the molecular level as well as the design and development of efficient bioemulsifiers.IMPORTANCEPrevious research (Shahryari et al. 2021, mSystems 6: e01175-20) introduced and characterized the SA01-OmpA protein as a multifaceted protein with a variety of functions, including maintaining cellular homeostasis under oxidative stress conditions, biofilm formation, outer membrane vesicles (OMV) biogenesis, and beneficial emulsifying capacity. By truncating the SA01-OmpA protein, the current study presents a unique method for developing protein-type bioemulsifiers. The findings indicate that the N-terminally truncated SA01-OmpA (NT-OmpA) has the potential to fully replace full-length SA01-OmpA as a novel bioemulsifier with significant emulsifying activity. This study opens up a new frontier in bioemulsifiers, shedding light on a possible relationship between the structure and activity of SA01-OmpA truncated forms.
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Affiliation(s)
- Naeema Mohseni Sani
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Mahbubeh Talaee
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Ali Akbari
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Faranak Ashoori
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Javad Zamani
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Ali A. Kermani
- Department of Structural Biology, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Hossein Shahbani Zahiri
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - John Presley
- Department of Anatomy & Cell Biology, McGill University, Montreal, Québec, Canada
| | - Hojatollah Vali
- Department of Anatomy & Cell Biology, McGill University, Montreal, Québec, Canada
| | - Kambiz Akbari Noghabi
- Department of Energy and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
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Singh U, Singh P, Singh AK, Singh S, Kumar D, Shrivastava SK, Asthana RK. In silico and in vitro evaluation of extract derived from Dunaliella salina, a halotolerant microalga for its antifungal and antibacterial activity. J Biomol Struct Dyn 2023; 41:7069-7083. [PMID: 36017823 DOI: 10.1080/07391102.2022.2115556] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 08/14/2022] [Indexed: 10/15/2022]
Abstract
In the present study little explored halotolerant wall-less green alga Dunaliella salina was found to be a potent source of antibacterial and antifungal biomolecules. Both the target pathogens, bacteria (Escherischia coli, Klebsiella pneumoniae, and Acinetobacter baumannii) and fungi (Candida albicans, C. tropicalis, and Cryptococus sp.) were WHO prioritized. The bioassay guided approach led us to evaluate antibacterial and antifungal lead molecule(s) from an array of compounds using spectroscopic and in silico studies. The methanol derived crude extract was purified via thin layer chromatography (TLC) using solvent system methanol: chloroform (1:19). Maximum antimicrobial activity was observed in fractions D5, D6 and D7, the components of which were then recognized using high resolution-liquid chromatography/mass spectroscopy (Orbitrap) (HR-LC/MS). The screened compounds were then docked with target enzymes sterol-14-alpha demethylase and OmpF porin protein. The energy scores revealed that amongst all, lariciresinol-4-O-glucoside showed better binding affinity, in silico, using the Schrödinger Maestro 2018-1 platform. The 3-dimensional crystal structures of both the proteins were retrieved from the protein data bank (PDB), and showed binding energies of -14.35 kcal/mol, and -11.0 kcal/mol against respective drug targets. The molecular dynamics (MD) simulations were performed for 100 ns, using Desmond package, Schrödinger to evaluate the conformational stability and alteration of protein-ligand complexes during the simulation. Thus, our findings confirmed that lariciresinol-4-O-glucoside, a lignan derivative and known strong antioxidant, may be used as an important "lead" molecule to be developed as antibacterial and antifungal drugs in the future.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Urmilesh Singh
- R. N. Singh Memorial Laboratory, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Prabhakar Singh
- Biochemistry Department, North Eastern Hill University, Shillong, Meghalaya, India
| | - Ankit Kumar Singh
- Department of Botany, Marwari College (a constituent unit of Lalit Narayan Mithila University), Darbhanga, Bihar, India
| | - Sweksha Singh
- R. N. Singh Memorial Laboratory, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Deepak Kumar
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Sushant Kumar Shrivastava
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Ravi Kumar Asthana
- R. N. Singh Memorial Laboratory, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
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Richter R, Kamal MAM, Koch M, Niebuur B, Huber A, Goes A, Volz C, Vergalli J, Kraus T, Müller R, Schneider‐Daum N, Fuhrmann G, Pagès J, Lehr C. An Outer Membrane Vesicle-Based Permeation Assay (OMPA) for Assessing Bacterial Bioavailability. Adv Healthc Mater 2022; 11:e2101180. [PMID: 34614289 DOI: 10.1002/adhm.202101180] [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: 06/15/2021] [Revised: 09/14/2021] [Indexed: 11/11/2022]
Abstract
When searching for new antibiotics against Gram-negative bacterial infections, a better understanding of the permeability across the cell envelope and tools to discriminate high from low bacterial bioavailability compounds are urgently needed. Inspired by the phospholipid vesicle-based permeation assay (PVPA), which is designed to predict non-facilitated permeation across phospholipid membranes, outer membrane vesicles (OMVs) of Escherichia coli either enriched or deficient of porins are employed to coat filter supports for predicting drug uptake across the complex cell envelope. OMVs and the obtained in vitro model are structurally and functionally characterized using cryo-TEM, SEM, CLSM, SAXS, and light scattering techniques. In vitro permeability, obtained from the membrane model for a set of nine antibiotics, correlates with reported in bacterio accumulation data and allows to discriminate high from low accumulating antibiotics. In contrast, the correlation of the same data set generated by liposome-based comparator membranes is poor. This better correlation of the OMV-derived membranes points to the importance of hydrophilic membrane components, such as lipopolysaccharides and porins, since those features are lacking in liposomal comparator membranes. This approach can offer in the future a high throughput screening tool with high predictive capacity or can help to identify compound- and bacteria-specific passive uptake pathways.
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Affiliation(s)
- Robert Richter
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
| | - Mohamed A. M. Kamal
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
| | - Marcus Koch
- INM – Leibniz Institute for New Materials Campus D2.2 Saarbrücken 66123 Germany
| | - Bart‐Jan Niebuur
- INM – Leibniz Institute for New Materials Campus D2.2 Saarbrücken 66123 Germany
| | - Anna‐Lena Huber
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
| | - Adriely Goes
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
| | - Carsten Volz
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
| | - Julia Vergalli
- UMR_MD1 U‐1261 Aix‐Marseille Université INSERM IRBA MCT Faculté de Pharmacie 27 Boulevard Jean Moulin Marseille 13005 France
| | - Tobias Kraus
- INM – Leibniz Institute for New Materials Campus D2.2 Saarbrücken 66123 Germany
- Colloid and Interface Chemistry Saarland University Campus D2.2 Saarbrücken 66123 Germany
| | - Rolf Müller
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
| | - Nicole Schneider‐Daum
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
| | - Gregor Fuhrmann
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
| | - Jean‐Marie Pagès
- UMR_MD1 U‐1261 Aix‐Marseille Université INSERM IRBA MCT Faculté de Pharmacie 27 Boulevard Jean Moulin Marseille 13005 France
| | - Claus‐Michael Lehr
- Helmholtz Centre for Infection Research Helmholtz Institute for Pharmaceutical Research Saarland Campus E8.1 Saarbrücken 66123 Germany
- Saarland University Department of Pharmacy Campus E8.1 Saarbrücken 66123 Germany
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Exploring the permeation of fluoroquinolone metalloantibiotics across outer membrane porins by combining molecular dynamics simulations and a porin-mimetic in vitro model. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183838. [PMID: 34896074 DOI: 10.1016/j.bbamem.2021.183838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 12/24/2022]
Abstract
The misuse and overuse of fluoroquinolones in recent years have triggered alarming levels of resistance to these antibiotics. Porin channels are crucial for the permeation of fluoroquinolones across the outer membrane of Gram-negative bacteria and modifications in porin expression are an important mechanism of bacterial resistance. One possible strategy to overcome this problem is the development of ternary copper complexes with fluoroquinolones. Compared to fluoroquinolones, these metalloantibiotics present a larger partition to the lipid bilayer and a more favorable permeation, by passive diffusion, across bacteriomimetic phospholipid-based model membranes. To rule out the porin-dependent pathway for the metalloantibiotics, we explored the permeation through OmpF (one of the most abundant porins present in the outer membrane of Gram-negative bacteria) using a multi-component approach. X-ray studies of OmpF porin crystals soaked with a ciprofloxacin ternary copper complex did not show a well-defined binding site for the compound. Molecular dynamics simulations showed that the translocation of the metalloantibiotic through this porin is less favorable than that of free fluoroquinolone, as it presented a much larger free energy barrier to cross the narrow constriction region of the pore. Lastly, permeability studies of different fluoroquinolones and their respective copper complexes using a porin-mimetic in vitro model corroborated the lower rate of permeation for the metalloantibiotics relative to the free antibiotics. Our results support a porin-independent mechanism for the influx of the metalloantibiotics into the bacterial cell. This finding brings additional support to the potential application of these metalloantibiotics in the fight against resistant infections and as an alternative to fluoroquinolones.
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Synthesis, Antibiofilm activity and molecular docking study of new water-soluble copper(II)-pincer complexes. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Millanao AR, Mora AY, Villagra NA, Bucarey SA, Hidalgo AA. Biological Effects of Quinolones: A Family of Broad-Spectrum Antimicrobial Agents. Molecules 2021; 26:7153. [PMID: 34885734 PMCID: PMC8658791 DOI: 10.3390/molecules26237153] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 10/28/2021] [Accepted: 11/05/2021] [Indexed: 11/28/2022] Open
Abstract
Broad antibacterial spectrum, high oral bioavailability and excellent tissue penetration combined with safety and few, yet rare, unwanted effects, have made the quinolones class of antimicrobials one of the most used in inpatients and outpatients. Initially discovered during the search for improved chloroquine-derivative molecules with increased anti-malarial activity, today the quinolones, intended as antimicrobials, comprehend four generations that progressively have been extending antimicrobial spectrum and clinical use. The quinolone class of antimicrobials exerts its antimicrobial actions through inhibiting DNA gyrase and Topoisomerase IV that in turn inhibits synthesis of DNA and RNA. Good distribution through different tissues and organs to treat Gram-positive and Gram-negative bacteria have made quinolones a good choice to treat disease in both humans and animals. The extensive use of quinolones, in both human health and in the veterinary field, has induced a rise of resistance and menace with leaving the quinolones family ineffective to treat infections. This review revises the evolution of quinolones structures, biological activity, and the clinical importance of this evolving family. Next, updated information regarding the mechanism of antimicrobial activity is revised. The veterinary use of quinolones in animal productions is also considered for its environmental role in spreading resistance. Finally, considerations for the use of quinolones in human and veterinary medicine are discussed.
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Affiliation(s)
- Ana R. Millanao
- Facultad de Ciencias, Instituto de Farmacia, Universidad Austral de Chile, Valdivia 5090000, Chile;
| | - Aracely Y. Mora
- Programa de Doctorado en Bioquímica, Universidad de Chile, Santiago 8380544, Chile;
| | - Nicolás A. Villagra
- Escuela de Tecnología Médica, Universidad Andres Bello, Santiago 8370071, Chile;
| | - Sergio A. Bucarey
- Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile;
| | - Alejandro A. Hidalgo
- Escuela de Química y Farmacia, Universidad Andres Bello, Santiago 8370071, Chile
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Ferreira M, Gameiro P. Fluoroquinolone-Transition Metal Complexes: A Strategy to Overcome Bacterial Resistance. Microorganisms 2021; 9:microorganisms9071506. [PMID: 34361943 PMCID: PMC8303200 DOI: 10.3390/microorganisms9071506] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/01/2021] [Accepted: 07/08/2021] [Indexed: 01/12/2023] Open
Abstract
Fluoroquinolones (FQs) are antibiotics widely used in the clinical practice due to their large spectrum of action against Gram-negative and some Gram-positive bacteria. Nevertheless, the misuse and overuse of these antibiotics has triggered the development of bacterial resistance mechanisms. One of the strategies to circumvent this problem is the complexation of FQs with transition metal ions, known as metalloantibiotics, which can promote different activity and enhanced pharmacological behaviour. Here, we discuss the stability of FQ metalloantibiotics and their possible translocation pathways. The main goal of the present review is to frame the present knowledge on the conjunction of biophysical and biological tools that can help to unravel the antibacterial action of FQ metalloantibiotics. An additional goal is to shed light on the studies that must be accomplished to ensure stability and viability of such metalloantibiotics. Potentiometric, spectroscopic, microscopic, microbiological, and computational techniques are surveyed. Stability and partition constants, interaction with membrane porins and elucidation of their role in the influx, determination of the antimicrobial activity against multidrug-resistant (MDR) clinical isolates, elucidation of the mechanism of action, and toxicity assays are described for FQ metalloantibiotics.
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Šimunková M, Štekláč M, Malček M. Spectroscopic, computational and molecular docking study of Cu( ii) complexes with flavonoids: from cupric ion binding to DNA intercalation. NEW J CHEM 2021. [DOI: 10.1039/d1nj01960k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper(ii) complexes with flavonoids as perspective therapeutic agents with DNA as a target molecule.
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Affiliation(s)
- Miriama Šimunková
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37
- Bratislava
- Slovak Republic
| | - Marek Štekláč
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37
- Bratislava
- Slovak Republic
| | - Michal Malček
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37
- Bratislava
- Slovak Republic
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9
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Ferreira M, Sousa CF, Gameiro P. Fluoroquinolone Metalloantibiotics to Bypass Antimicrobial Resistance Mechanisms: Decreased Permeation through Porins. MEMBRANES 2020; 11:membranes11010003. [PMID: 33375018 PMCID: PMC7822003 DOI: 10.3390/membranes11010003] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/17/2020] [Accepted: 12/21/2020] [Indexed: 12/27/2022]
Abstract
Fluoroquinolones (FQs) are broad-spectrum antibiotics largely used in the clinical practice against Gram-negative and some Gram-positive bacteria. Nevertheless, bacteria have developed several antimicrobial resistance mechanisms against such class of antibiotics. Ternary complexes of FQs, copper(II) and phenanthroline, known as metalloantibiotics, arise in an attempt to counteract an antibiotic resistance mechanism related to low membrane permeability. These metalloantibiotics seem to use an alternative influx route, independent of porins. The translocation pathways of five FQs and its metalloantibiotics were studied through biophysical experiments, allowing us to infer about the role of OmpF porin in the influx. The FQ-OmpF interaction was assessed in mimetic membrane systems differing on the lipidic composition, disclosing no interference of the lipidic composition. The drug-porin interaction revealed similar values for the association constants of FQs and metalloantibiotics with native OmpF. Therefore, OmpF mutants and specific quenchers were used to study the location-association relationship, comparing a free FQ and its metalloantibiotic. The free FQ revealed a specific association, with preference for residues on the centre of OmpF, while the metalloantibiotic showed a random interaction. Thereby, metalloantibiotics may be an alternative to pure FQs, being able to overcome some antimicrobial resistance mechanism of Gram-negative bacteria related to decreased membrane permeability.
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Kong X, Song W, Hua Y, Li X, Chen Y, Zhang C, Chen Y. Insights into the antibacterial activity of cottonseed protein-derived peptide against Escherichia coli. Food Funct 2020; 11:10047-10057. [PMID: 33135695 DOI: 10.1039/d0fo01279c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In the study, antibacterial peptides were separated and identified from cottonseed protein hydrolysates and the interactions between antibacterial peptides and Escherichia coli were further investigated. Firstly, by using a combined strategy of Amberlite CG-50 ion exchange chromatography and reversed-phase high-performance liquid chromatography, three peptides with antibacterial activity were purified and identified, including HHRRFSLY, KFMPT, and RRLFSDY. Interestingly, HHRRFSLY and RRLFSDY exhibited higher inhibition activity with the IC50 value of 0.26 mg mL-1 and 0.58 mg mL-1 (p < 0.05), respectively. Flow cytometry results showed that the incubation of antibacterial peptides with E. coli could cause damage to the integrity of the E. coli cell membrane. Transmission electron microscopy and scanning electron microscopy results revealed the damage caused to the bacterial cell surface and the leakage of cytoplasmic content by the antibacterial peptides. Molecular docking studies indicated that HHRRFSLY, KFMPT, and RRLFSDY have a good binding affinity to the active sites of the surface protein (OmpF) mainly through a hydrogen bond and salt bridge. The results here showed that the antibacterial peptides derived from cottonseed protein could be used as a good choice for functional foods or related drugs, and also shed light on further studies of antibacterial mechanism.
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Affiliation(s)
- Xiangzhen Kong
- State Key Laboratory of Food Science and Technology, Jiangnan University, China.
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Richter R, Kamal M, García-Rivera MA, Kaspar J, Junk M, Elgaher WA, Srikakulam SK, Gress A, Beckmann A, Grißmer A, Meier C, Vielhaber M, Kalinina O, Hirsch AK, Hartmann RW, Brönstrup M, Schneider-Daum N, Lehr CM. A hydrogel-based in vitro assay for the fast prediction of antibiotic accumulation in Gram-negative bacteria. Mater Today Bio 2020; 8:100084. [PMID: 33313504 PMCID: PMC7720078 DOI: 10.1016/j.mtbio.2020.100084] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 11/30/2022] Open
Abstract
The pipeline of antibiotics has been for decades on an alarmingly low level. Considering the steadily emerging antibiotic resistance, novel tools are needed for early and easy identification of effective anti-infective compounds. In Gram-negative bacteria, the uptake of anti-infectives is especially limited. We here present a surprisingly simple in vitro model of the Gram-negative bacterial envelope, based on 20% (w/v) potato starch gel, printed on polycarbonate 96-well filter membranes. Rapid permeability measurements across this polysaccharide hydrogel allowed to correctly predict either high or low accumulation for all 16 tested anti-infectives in living Escherichia coli. Freeze-fracture TEM supports that the macromolecular network structure of the starch hydrogel may represent a useful surrogate of the Gram-negative bacterial envelope. A random forest analysis of in vitro data revealed molecular mass, minimum projection area, and rigidity as the most critical physicochemical parameters for hydrogel permeability, in agreement with reported structural features needed for uptake into Gram-negative bacteria. Correlating our dataset of 27 antibiotics from different structural classes to reported MIC values of nine clinically relevant pathogens allowed to distinguish active from nonactive compounds based on their low in vitro permeability specifically for Gram-negatives. The model may help to identify poorly permeable antimicrobial candidates before testing them on living bacteria.
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Affiliation(s)
- Robert Richter
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany
| | - Mohamed.A.M. Kamal
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Mariel A. García-Rivera
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), 38124 Braunschweig, Germany
| | - Jerome Kaspar
- Institute of Engineering Design, Saarland University, 66123 Saarbrücken, Germany
| | - Maximilian Junk
- Institute of Engineering Design, Saarland University, 66123 Saarbrücken, Germany
| | - Walid A.M. Elgaher
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Sanjay Kumar Srikakulam
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Alexander Gress
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Anja Beckmann
- Department of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Alexander Grißmer
- Department of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Carola Meier
- Department of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Michael Vielhaber
- Institute of Engineering Design, Saarland University, 66123 Saarbrücken, Germany
| | - Olga Kalinina
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
- Medical Faculty, Saarland University, 66421 Homburg, Germany
| | - Anna K.H. Hirsch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany
| | - Rolf W. Hartmann
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Mark Brönstrup
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), 38124 Braunschweig, Germany
- German Centre for Infection Research (DZIF), 38124 Braunschweig, Germany
| | - Nicole Schneider-Daum
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
| | - Claus-Michael Lehr
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) – Helmholtz Centre for Infection Research (HZI), 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany
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Friedman R, Khalid S, Aponte-Santamaría C, Arutyunova E, Becker M, Boyd KJ, Christensen M, Coimbra JTS, Concilio S, Daday C, van Eerden FJ, Fernandes PA, Gräter F, Hakobyan D, Heuer A, Karathanou K, Keller F, Lemieux MJ, Marrink SJ, May ER, Mazumdar A, Naftalin R, Pickholz M, Piotto S, Pohl P, Quinn P, Ramos MJ, Schiøtt B, Sengupta D, Sessa L, Vanni S, Zeppelin T, Zoni V, Bondar AN, Domene C. Understanding Conformational Dynamics of Complex Lipid Mixtures Relevant to Biology. J Membr Biol 2018; 251:609-631. [PMID: 30350011 PMCID: PMC6244758 DOI: 10.1007/s00232-018-0050-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 10/03/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Ran Friedman
- Department of Chemistry and Biomedical Sciences and Centre of Excellence "Biomaterials Chemistry", Linnæus University, Kalmar, Sweden.
| | - Syma Khalid
- University of Southampton, Southampton, SO17 1BJ, UK
| | - Camilo Aponte-Santamaría
- Max Planck Tandem Group in Computational Biophysics, University of Los Andes, Bogotá, Colombia.,Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Heidelberg, Germany
| | - Elena Arutyunova
- Department of Biochemistry, University of Alberta, Edmonton, Canada
| | | | - Kevin J Boyd
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT, USA
| | - Mikkel Christensen
- Department of Chemistry, Aarhus University, Aarhus, Denmark.,Interdisciplinary Nanoscience center (iNANO), Aarhus University, Aarhus, Denmark.,Sino-Danish Center for Education and Research, Beijing, China
| | - João T S Coimbra
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - Simona Concilio
- Department of Industrial Engineering, University of Salerno, Fisciano, SA, Italy
| | - Csaba Daday
- Heidelberg Institute for Theoretical Studies, Heidelberg, Germany
| | | | - Pedro A Fernandes
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - Frauke Gräter
- Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Heidelberg, Germany.,Heidelberg Institute for Theoretical Studies, Heidelberg, Germany
| | | | | | - Konstantina Karathanou
- Department of Physics, Theoretical Molecular Biophysics Group, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | | | - M Joanne Lemieux
- Department of Biochemistry, University of Alberta, Edmonton, Canada
| | | | - Eric R May
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT, USA
| | - Antara Mazumdar
- GBB Institute, University of Groningen, Groningen, The Netherlands
| | - Richard Naftalin
- Physiology and Vascular Biology Departments, King's College London School of Medicine, London, UK
| | - Mónica Pickholz
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, IFIBA, Buenos Aires, Argentina
| | - Stefano Piotto
- Department of Pharmacy, University of Salerno, Fisciano, SA, Italy
| | - Peter Pohl
- Institute of Biophysics, Johannes Kepler University, Linz, Austria
| | - Peter Quinn
- Biochemistry Department, King's College London, London, UK
| | - Maria J Ramos
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - Birgit Schiøtt
- Department of Chemistry, Aarhus University, Aarhus, Denmark.,Interdisciplinary Nanoscience center (iNANO), Aarhus University, Aarhus, Denmark
| | - Durba Sengupta
- Physical Chemistry Division, National Chemical Laboratory, Pune, India
| | - Lucia Sessa
- Department of Pharmacy, University of Salerno, Fisciano, SA, Italy
| | - Stefano Vanni
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Talia Zeppelin
- Department of Chemistry, Aarhus University, Aarhus, Denmark
| | - Valeria Zoni
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Ana-Nicoleta Bondar
- Department of Physics, Theoretical Molecular Biophysics Group, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Carmen Domene
- Department of Chemistry, University of Bath, Claverton Down Bath, BA2 7AY, UK.,Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
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Muthukkumar M, Kamal C, Venkatesh G, Kaya C, Kaya S, Enoch IV, Vennila P, Rajavel R. Structural, spectral, DFT and biological studies on macrocyclic mononuclear ruthenium (II) complexes. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.132] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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