Characteristic of streptomyces species with antimicrobial activity against selected phytopathogenic bacteria and fungi

Microorganisms like fungi, actinomycetes and bacteria are considered nanofactories and are helpful in the production of nanoparticles useful in the welfare of human beings. In the present study, we investigated the production of silver nanoparticles from Streptomyces species JF714876. Extracellular synthesis of silver nanoparticles by Streptomyces species was carried out using two different media. Silver nanoparticles were examined using UV-visible, IR and atomic force microscopy. The size of silver nanoparticles was in the range of 80-100 nm. Antimicrobial activity of silver nanoparticle against bacteria such as E. coli, S. aureus, and dermatophytes like T. rubrum and T. tonsurans was determined. Thus, this study suggests that the Streptomyces sp. JF741876 can produce silver ions that can be used as an antimicrobial substance.

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Antimicrobial metabolite profiling of Nigrospora sphaerica from Adiantum philippense L.

Journal of Genetic Engineering and Biotechnology ◽

10.1186/s43141-020-00080-4 ◽

2020 ◽

Vol 18 (1) ◽

Author(s):

Kolathuru Puttamadaiah Ramesha ◽

Nagabhushana Chandra Mohana ◽

Bettadapura Rameshgowda Nuthan ◽

Devaraju Rakshith ◽

Sreedharamurthy Satish

Keyword(s):

Escherichia Coli ◽

Antimicrobial Activity ◽

Xanthomonas Campestris ◽

Fungal Endophytes ◽

Leaf Segment ◽

Spectroscopic Techniques ◽

Biological Potential ◽

Bioassay Guided Fractionation ◽

Antimicrobial Metabolite ◽

Bacteria And Fungi

Abstract Background Endophyte bestows beneficial aspects to its inhabiting host, along with a contribution to diverse structural attributes with biological potential. In this regard, antimicrobial profiling of fungal endophytes from medicinal plant Adiantum philippense revealed bioactive Nigrospora sphaerica from the leaf segment. Chemical and biological profiling through TLC–bioautography and hyphenated spectroscopic techniques confirmed the presence of phomalactone as an antimicrobial metabolite. Results The chemical investigation of the broth extract by bioassay-guided fractionation confirmed phomalactone as a bioactive antimicrobial secondary metabolite. The antimicrobial activity of phomalactone was found to be highest against Escherichia coli by disc diffusion assay. The MIC was found to be significant against both Escherichia coli and Xanthomonas campestris in the case of bacteria and dermatophyte Candida albicans at 150 μg/ml, respectively. Conclusions Overall, the results highlighted the antimicrobial potential of phomalactone from the endophyte Nigrospora sphaerica exhibiting a broad spectrum of antimicrobial activity against human and phytopathogenic bacteria and fungi. This work is the first report regarding the antibacterial activity of phomalactone.

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Plant antimicrobial peptides: structures, functions, and applications

Botanical Studies ◽

10.1186/s40529-021-00312-x ◽

2021 ◽

Vol 62 (1) ◽

Author(s):

Junpeng Li ◽

Shuping Hu ◽

Wei Jian ◽

Chengjian Xie ◽

Xingyong Yang

Keyword(s):

Antimicrobial Activity ◽

Antimicrobial Peptides ◽

Agricultural Production ◽

Food Additives ◽

Antimicrobial Activities ◽

Gram Positive Bacteria ◽

Potential Applications ◽

Potential Applicability ◽

Bacteria And Fungi ◽

Positively Charged

AbstractAntimicrobial peptides (AMPs) are a class of short, usually positively charged polypeptides that exist in humans, animals, and plants. Considering the increasing number of drug-resistant pathogens, the antimicrobial activity of AMPs has attracted much attention. AMPs with broad-spectrum antimicrobial activity against many gram-positive bacteria, gram-negative bacteria, and fungi are an important defensive barrier against pathogens for many organisms. With continuing research, many other physiological functions of plant AMPs have been found in addition to their antimicrobial roles, such as regulating plant growth and development and treating many diseases with high efficacy. The potential applicability of plant AMPs in agricultural production, as food additives and disease treatments, has garnered much interest. This review focuses on the types of plant AMPs, their mechanisms of action, the parameters affecting the antimicrobial activities of AMPs, and their potential applications in agricultural production, the food industry, breeding industry, and medical field.

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Impact of Altitudinal Variation on the Phytochemical Profile, Anthelmintic and Antimicrobial Activity of Two Pinus Species

Molecules ◽

10.3390/molecules26113170 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3170

Author(s):

Wafaa M. Elkady ◽

Mariam H. Gonaid ◽

Miriam F. Yousif ◽

Mahmoud El-Sayed ◽

Hind A. N. Omar

Keyword(s):

Antimicrobial Activity ◽

Essential Oils ◽

Pinus Halepensis ◽

Biological Activities ◽

Anthelmintic Activity ◽

Antimicrobial Activities ◽

Pinus Pinea ◽

Active Components ◽

Pinus Species ◽

Bacteria And Fungi

Active components from natural sources are the current focus in most pharmacological research to provide new therapeutic agents for clinical use. Essential oils from the Pinus species have been traditionally used in medicine. This study aimed to investigate the chemical profile of two Pinus species, Pinus halepensis L. and Pinus pinea Mill, from different altitudes in Libya and study the effect of environmental conditions on the biological activities of essential oils. A clevenger apparatus was used to prepare the essential oils by hydrodistillation. Analyses were done using GC/MS. Anthelmintic and antimicrobial activities were tested against the earthworm Allolobophora caliginosa, gram-positive bacteria, gram-negative bacteria, and fungi. Different chemical profiles were observed among all tested essential oils, and terpenes were the most dominant class. All studied essential oils from the Pinus species exhibited a remarkable anthelmintic activity compared to the standard piperazine citrate drug. Pinus halepensis from both altitudes showed broad-spectrum antimicrobial activity against all tested microorganisms, while Pinus pinea was effective against only Escherichia coli. From these findings, one can conclude that there are variations between studied species. The essential oil compositions are affected by environmental factors, which consequently affect the anthelmintic and antimicrobial activity.

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Antimicrobial Activity of Cationic Poly(3-hexylthiophene) Nanoparticles Coupled with Dual Fluorescent and Electrochemical Sensing: Theragnostic Prospect

Sensors ◽

10.3390/s21051715 ◽

2021 ◽

Vol 21 (5) ◽

pp. 1715

Author(s):

Nada Elgiddawy ◽

Shiwei Ren ◽

Wadih Ghattas ◽

Waleed M. A. El Rouby ◽

Ahmed O. El-Gendy ◽

...

Keyword(s):

Antimicrobial Activity ◽

Fluorescence Spectroscopy ◽

Bacterial Infections ◽

Electrochemical Impedance ◽

Spectroscopic Properties ◽

Electrochemical Sensing ◽

E Coli ◽

Normal Human ◽

Dual Detection ◽

Bacteria And Fungi

Designing therapeutic and sensor materials to diagnose and eliminate bacterial infections remains a significant challenge for active theragnostic nanoprobes. In the present work, fluorescent/electroactive poly(3-hexylthiophene) P3HT nanoparticles (NPs) stabilized with quaternary ammonium salts using cetyltrimethylammonium bromide (CTAB), (CTAB-P3HT NPs) were prepared using a simple mini-emulsion method. The morphology, spectroscopic properties and electronic properties of CTAB-P3HT NPs were characterized by DLS, zeta potential, SEM, TEM, UV-vis spectrophotometry, fluorescence spectroscopy and electrochemical impedance spectroscopy (EIS). In an aqueous solution, CTAB-P3HT NPs were revealed to be uniformly sized, highly fluorescent and present a highly positively charged NP surface with good electroactivity. Dual detection was demonstrated as the binding of the bacteria to NPs could be observed by fluorescence quenching as well as by the changes in EIS. Binding of E. coli to CTAB-P3HT NPs was demonstrated and LODs of 5 CFU/mL and 250 CFU/mL were obtained by relying on the fluorescence spectroscopy and EIS, respectively. The antimicrobial activity of CTAB-P3HT NPs on bacteria and fungi was also studied under dark and nutritive conditions. An MIC and an MBC of 2.5 µg/mL were obtained with E. coli and with S. aureus, and of 0.312 µg/mL with C. albicans. Additionally a good biocompatibility toward normal human cells (WI38) was observed, which opens the way to their possible use as a therapeutic agent.

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Synthesis and biological activity of 4-thiazolidinone derivatives of phenothiazine

Journal of the Serbian Chemical Society ◽

10.2298/jsc100924152s ◽

2012 ◽

Vol 77 (1) ◽

pp. 17-26 ◽

Cited By ~ 9

Author(s):

Ritu Sharma ◽

Pushkal Samadhiya ◽

Savitri Srivastava ◽

Santosh Srivastava

Keyword(s):

Antimicrobial Activity ◽

Heterocyclic Compounds ◽

Thioglycolic Acid ◽

Cycloaddition Reaction ◽

Aromatic Aldehydes ◽

Knoevenagel Reaction ◽

Antituberculosis Activity ◽

Bacteria And Fungi ◽

Derivatives Of ◽

Anhydrous Zncl2

A new series of N-[3-(10H-phenothiazinyl)-propyl]-2-(substituted phenyl)-4-oxo-5-( substituted benzylidene)-1,3-thiazolidine-carboxamide, 5(as) have been synthesized. The cycloaddition reaction of thioglycolic acid with N-[3-(10H-phenothiazinyl)-propyl]-N?-[(substituted phenyl)-methylidene]- urea, 3(a-s) in the presence of anhydrous ZnCl2 afforded new heterocyclic compounds N-[3-(10H-phenothiazinyl)-propyl]-2-(substituted phenyl)-4-oxo- 1,3-thiazolidine-carboxamide, 4(a-s). The later product on treatment with several selected substituted aromatic aldehydes in the presence of C2H5ONa undergoes Knoevenagel reaction to yield 5(a-s). The structure of compounds 1, 2, 3(a-s), 4(a-s) and 5(a-s) were confirmed by IR, 1H NMR, 13C NMR, Fmass and chemical analysis. All above compounds were screened for their antimicrobial activity against some selected bacteria and fungi and for antituberculosis activity compounds have been screened against the bacterium M. tuberculosis.

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