Two Proteins From Snake Venom Have Potent Antibacterial Effects Against Bacillus Anthracis and Streptococcus Pneumoniae

Background: Antibacterial proteins are widely expressed in snake venoms. Previously, we have isolated two immunodominant proteins with molecular weights of 14 and 65 kD from the snake venom of Naja naja oxiana (N. oxiana). It was demonstrated that they had potent inhibitory effects against gram-positive bacteria, S. aureus and B. subtilis but were less effective against gram-negative bacteria, such as E. coli and P. aeruginosa. This study aimed at investigating the potential antibacterial effects of the two proteins against Bacillus anthracis and Streptococcus pneumoniae. Methods: The proteins were identified by SDS-PAGE and western blot analysis, and isolated by Gel Electrophoresis (Electro-elution). The antibacterial effects were tested against the strains of Bacillus anthracis and Streptococcus pneumoniae, using broth microdilution and disc-diffusion assays. For comparison, the antibacterial effects of standard antibiotics, such as Gentamicin, Ampicillin, Penicillin, Amoxicillin and Ciprofloxacin were also tested on the same B. anthracis and S. pneumoniae batches under identical laboratory conditions. Results: The two proteins showed high immunogenicity and strongly inhibited the growth of gram-positive bacteria, B. anthracis, and to a lesser extent S. pneumoniae. Conclusion: The isolated proteins demonstrated strong antibacterial effects against Gram-positive bacteria, B. anthracis and S. pneumoniae, in addition to their previously known effects against S. aureus and B. subtilis.

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Antibacterial effects of commercially available phosphates on selected microorganisms

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis ◽

10.11118/actaun200856050019 ◽

2008 ◽

Vol 56 (5) ◽

pp. 19-24 ◽

Cited By ~ 4

Author(s):

Leona Buňková ◽

Pavel Pleva ◽

František Buňka ◽

Pavel Valášek ◽

Stanislav Kráčmar

Keyword(s):

Inhibitory Effect ◽

Gram Negative Bacteria ◽

Bacterial Strains ◽

Inhibitory Effects ◽

Antibacterial Effects ◽

Gram Positive ◽

Gram Negative ◽

Gram Positive Bacteria ◽

The Individual ◽

Phosphate Salts

In the food industry, phosphates, polyphosphates and their salts are used, for example, as emulsifying agents in the production of processed cheese. The inhibitory effects of three commercially available phosphates and polyphosphates differing in their chain length (690, S9 and HBS) were tested on a set of 15 gram-positive or gram-negative CCM (Czech Collection of Microorganisms) strains and on 12 bacterial strains isolated from processed cheeses. Five different concentrations of each phosphate were chosen (0.1, 0.2, 0.3, 0.4 and 0.5% w/v) in order to observe the inhibitory effects of the phosphate salts on the growth of the microorganisms tested. Sensitivity of the individual bacterial strains to phosphates was observed of a liquid cultivation medium which was supplemented with applied salts. Subsequently, the growth in cells was determined by measuring optical density at a wavelength of 600 nm. According to the results, 690 and S9 phosphates, containing mainly orthophosphates, diphosphates (pyrophosphates) and short-chain polyphosphates, do not have a significant inhibitory effect on the growth of the tested bacteria. Significant inhibitory effects were observed only in HBS salt (a mixture of long-chain polyphosphates), which showed antibacterial effects on all gram-positive bacteria tested (both the CCM strains and those isolated from processed cheeses). The antibacterial effect of phosphates on gram-positive microorganisms is growing with the increasing length of the polyphosphate chain. This study has not proved a significant effect of the phosphates tested on the growth of gram-negative bacteria used.

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A novel bis(pyrazolyl)methane compound as a potential agent against Gram-positive bacteria

Scientific Reports ◽

10.1038/s41598-021-95609-z ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Pedro Seguí ◽

John J. Aguilera-Correa ◽

Elena Domínguez-Jurado ◽

Christian M. Sánchez-López ◽

Ramón Pérez-Tanoira ◽

...

Keyword(s):

Antibacterial Activity ◽

Inhibitory Effect ◽

Eukaryotic Cell ◽

Liver Carcinoma ◽

Gram Positive ◽

Minimal Inhibitory Concentrations ◽

E Coli ◽

Gram Positive Bacteria ◽

Therapeutic Compounds ◽

Toxic Concentrations

AbstractThis study was designed to propose alternative therapeutic compounds to fight against bacterial pathogens. Thus, a library of nitrogen-based compounds bis(triazolyl)methane (1T–7T) and bis(pyrazolyl)methane (1P–11P) was synthesised following previously reported methodologies and their antibacterial activity was tested using the collection strains of Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, and Pseudomonas aeruginosa. Moreover, the novel compound 2P was fully characterized by IR, UV–Vis and NMR spectroscopy. To evaluate antibacterial activity, minimal inhibitory concentrations (MICs), minimal bactericidal concentrations (MBCs), minimum biofilm inhibitory concentrations (MBICs), and minimum biofilm eradication concentrations (MBECs) assays were carried out at different concentrations (2–2000 µg/mL). The MTT assay and Resazurin viability assays were performed in both human liver carcinoma HepG2 and human colorectal adenocarcinoma Caco-2 cell lines at 48 h. Of all the synthesised compounds, 2P had an inhibitory effect on Gram-positive strains, especially against S. aureus. The MIC and MBC of 2P were 62.5 and 2000 µg/mL against S. aureus, and 250 and 2000 µg/mL against E. faecalis, respectively. However, these values were > 2000 µg/mL against E. coli and P. aeruginosa. In addition, the MBICs and MBECs of 2P against S. aureus were 125 and > 2000 µg/mL, respectively, whereas these values were > 2000 µg/mL against E. faecalis, E. coli, and P. aeruginosa. On the other hand, concentrations up to 250 µg/mL of 2P were non-toxic doses for eukaryotic cell cultures. Thus, according to the obtained results, the 2P nitrogen-based compound showed a promising anti-Gram-positive effect (especially against S. aureus) both on planktonic state and biofilm, at non-toxic concentrations.

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Preparation of bioactive and antibacterial PMMA-based bone cement by modification with quaternary ammonium and alkoxysilane

Journal of Biomaterials Applications ◽

10.1177/08853282211004413 ◽

2021 ◽

pp. 088532822110044

Author(s):

Haiyang Wang ◽

Toshinari Maeda ◽

Toshiki Miyazaki

Keyword(s):

Antibacterial Activity ◽

Methyl Methacrylate ◽

Bone Cement ◽

Setting Time ◽

Antibacterial Properties ◽

The Body ◽

Apatite Formation ◽

Gram Positive ◽

E Coli ◽

Gram Positive Bacteria

Bone cement based on poly(methyl methacrylate) (PMMA) powder and methyl methacrylate (MMA) liquid is a very popular biomaterial used for the fixation of artificial joints. However, there is a risk of this cement loosening from bone because of a lack of bone-bonding bioactivity. Apatite formation in the body environment is a prerequisite for cement bioactivity. Additionally, suppression of infection during implantation is required for bone cements to be successfully introduced into the human body. In this study, we modified PMMA cement with γ-methacryloxypropyltrimetoxysilane and calcium acetate to introduce bioactive properties and 2-( tert-butylamino)ethyl methacrylate (TBAEMA) to provide antibacterial properties. The long-term antibacterial activity is attributed to the copolymerization of TBAEMA and MMA. As the TBAEMA content increased, the setting time increased and the compressive strength decreased. After soaking in simulated body fluid, an apatite layer was detected within 7 days, irrespective of the TBAEMA content. The cement showed better antibacterial activity against Gram-negative E. Coli than Gram-positive bacteria; however, of the Gram-positive bacteria investigated, B. subtilis was more susceptible than S. aureus.

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In Vitro and In Vivo Activities of DA-7867, a New Oxazolidinone, against Aerobic Gram-Positive Bacteria

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.49.6.2498-2500.2005 ◽

2005 ◽

Vol 49 (6) ◽

pp. 2498-2500 ◽

Cited By ~ 7

Author(s):

Eun Jeong Yoon ◽

Yeong Woo Jo ◽

Sung Hak Choi ◽

Tae Ho Lee ◽

Jae Keol Rhee ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Streptococcus Pneumoniae ◽

Gram Positive ◽

Methicillin Resistant ◽

Gram Positive Bacteria ◽

Vancomycin Resistant Enterococci ◽

Infection Models ◽

Vancomycin Resistant

ABSTRACT In vitro and in vivo activities of DA-7867 were assessed against methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, and penicillin-resistant Streptococcus pneumoniae. All isolates were inhibited by DA-7867 at ≤0.78 μg/ml, a four-times-lower concentration than that of inhibition by linezolid. For murine infection models, DA-7867 also exhibited greater efficacy than linezolid against all isolates tested.

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Construction of Leaderless-Bacteriocin-Producing Bacteriophage Targeting E. coli and Neighboring Gram-Positive Pathogens

Microbiology Spectrum ◽

10.1128/spectrum.00141-21 ◽

2021 ◽

Author(s):

Yoshimitsu Masuda ◽

Shun Kawabata ◽

Tatsuya Uedoi ◽

Ken-ichi Honjoh ◽

Takahisa Miyamoto

Keyword(s):

Antimicrobial Agents ◽

Host Strain ◽

Phage Resistance ◽

Gram Positive ◽

Gram Negative ◽

E Coli ◽

Gram Positive Bacteria ◽

T7 Phage

We demonstrated that we could combine LLB and phage to construct promising novel antimicrobial agents, LLB-phage. The first LLB-phage, lnqQ -T7 phage, can control the growth of both the Gram-negative host strain and neighboring Gram-positive bacteria while preventing the emergence of phage resistance in the host strain.

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Water-dispersible glycosylated poly(2,5′-thienylene)porphyrin-based nanoparticles for antibacterial photodynamic therapy

Photochemical & Photobiological Sciences ◽

10.1039/c8pp00470f ◽

2019 ◽

Vol 18 (5) ◽

pp. 1147-1155 ◽

Cited By ~ 5

Author(s):

Rehan Khan ◽

Melis Özkan ◽

Aisan Khaligh ◽

Dönüs Tuncel

Keyword(s):

Antibacterial Activity ◽

Photodynamic Therapy ◽

Singlet Oxygen ◽

Gram Negative Bacteria ◽

Gram Positive ◽

Gram Negative ◽

E Coli ◽

Water Dispersible ◽

Gram Positive Bacteria ◽

High Yields

Water-dispersible glycosylated poly(2,5′-thienylene)porphyrin-based nanoparticles have the ability to generate singlet oxygen in high yields and exhibit light-triggered antibacterial activity against Gram negative bacteria, E. coli as well as Gram positive bacteria, B. subtilis.

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Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.00776-07 ◽

2008 ◽

Vol 52 (1) ◽

pp. 244-247 ◽

Cited By ~ 8

Author(s):

David C. Griffith ◽

David Rodriguez ◽

Erik Corcoran ◽

Michael N. Dudley

Keyword(s):

Staphylococcus Aureus ◽

Streptococcus Pneumoniae ◽

Enterococcus Faecalis ◽

Infection Model ◽

Antibacterial Effects ◽

Bacteriostatic Effect ◽

Dosing Interval ◽

Gram Positive Bacteria ◽

Initiation Of Therapy

ABSTRACT RWJ-54428 (also known as MC-02,479) is a new cephalosporin with promising activity against gram-positive bacteria. The pharmacodynamics (PDs) of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis were studied in a neutropenic mouse thigh infection model. The RWJ-54428 MICs ranged from 0.25 to 1 mg/liter. Mice with ca. 106 CFU/thigh at the initiation of therapy were treated intraperitoneally with RWJ-54428 at doses that ranged from 3 to 1,200 mg/kg of body weight/day (in 2, 3, 4, 6, or 12 divided doses) for 24 h. The maximal reductions in bacterial counts in thigh tissues at 24 h for the methicillin-resistant S. aureus, penicillin-resistant S. pneumoniae, and E. faecalis strains were −2.8, −3.8, and −1.7 log10 CFU/thigh, respectively. The percentage of a 24-h dosing interval that the unbound serum RWJ-54428 concentrations exceeded the MIC (fT > MIC) was the pharmacokinetic (PK)-PD parameter that best described the efficacy of RWJ-54428. The fT > MICs for a bacteriostatic effect (no net change in the numbers of CFU/thigh over 24 h) ranged from 14 to 20% for staphylococci and streptococci; for maximal reductions in the numbers of CFU/thigh, the fT > MICs ranged from 22 to 36% for these strains. For E. faecalis, the ranges of fT > MICs for static and maximal effects were 30 to 46% and 55 to 60%, respectively. These data show that treatment with RWJ-54428 results in marked antibacterial effects in vivo, with the PK-PD parameters for efficacy being comparable to those for the efficacy of penicillins and carbapenems active against staphylococci and pneumococci.

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Another turn of the screw in shaving Gram-positive bacteria: Optimization of proteomics surface protein identification in Streptococcus pneumoniae

Journal of Proteomics ◽

10.1016/j.jprot.2012.04.037 ◽

2012 ◽

Vol 75 (12) ◽

pp. 3733-3746 ◽

Cited By ~ 36

Author(s):

Alfonso Olaya-Abril ◽

Lidia Gómez-Gascón ◽

Irene Jiménez-Munguía ◽

Ignacio Obando ◽

Manuel J. Rodríguez-Ortega

Keyword(s):

Streptococcus Pneumoniae ◽

Protein Identification ◽

Surface Protein ◽

Gram Positive ◽

Gram Positive Bacteria

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Synthesis and Antibacterial Activity of Chalcones and Pyrimidine-2-ones

E-Journal of Chemistry ◽

10.1155/2005/134830 ◽

2005 ◽

Vol 2 (2) ◽

pp. 109-112

Author(s):

A. K. Parekh ◽

K. K. Desai

Keyword(s):

Antibacterial Activity ◽

Spectral Data ◽

Elemental Analysis ◽

Aromatic Aldehydes ◽

Gram Negative Bacteria ◽

Gram Positive ◽

Gram Negative ◽

E Coli ◽

Gram Positive Bacteria ◽

H Nmr

Some new chalcones have been prepared by Claisen-schmidt condensation of ketone and different aromatic aldehydes. These chalcones on condensation with urea in presence of acid gave Pyrimidine-2-ones. The synthesized compounds have been characterized by elemental analysis, IR and1H NMR spectral data. They have been screened for their antibacterial activity against Gram positive bacteria B. subtillis & S. aureus and Gram negative bacteria E. coli & S. typhi.

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