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1.
Sci Rep ; 10(1): 9290, 2020 06 09.
Article in English | MEDLINE | ID: mdl-32518318

ABSTRACT

The Northern Wheatear (Oenanthe oenanthe, including the nominate and the two subspecies O. o. leucorhoa and O. o. libanotica) and the Seebohm's Wheatear (Oenanthe seebohmi) are today regarded as two distinct species. Before, all four taxa were regarded as four subspecies of the Northern Wheatear. Their classification has exclusively been based on ecological and morphological traits, while their molecular characterization is still missing. With this study, we used next-generation sequencing to assemble 117 complete mitochondrial genomes covering O. o. oenanthe, O. o. leucorhoa and O. seebohmi. We compared the resolution power of each individual mitochondrial marker and concatenated marker sets to reconstruct the phylogeny and estimate speciation times of three taxa. Moreover, we tried to identify the origin of migratory wheatears caught on Helgoland (Germany) and on Crete (Greece). Mitogenome analysis revealed two different ancient lineages that separated around 400,000 years ago. Both lineages consisted of a mix of subspecies and species. The phylogenetic trees, as well as haplotype networks are incongruent with the present morphology-based classification. Mitogenome could not distinguish these presumed species. The genetic panmixia among present populations and taxa might be the consequence of mitochondrial introgression between ancient wheatear populations.


Subject(s)
Genetic Speciation , Genome, Mitochondrial/genetics , Songbirds/classification , Songbirds/genetics , Animal Migration , Evolution, Molecular , Germany , Greece , Haplotypes/genetics , High-Throughput Nucleotide Sequencing , Mitochondria/genetics , Phylogeny
2.
Dev Comp Immunol ; 104: 103556, 2020 03.
Article in English | MEDLINE | ID: mdl-31747541

ABSTRACT

Defensins are one the largest group of antimicrobial peptides and are part of the innate defence. Defensins are produced by animals, plants and fungi. In animals and plants, defensins can be constitutively or differentially expressed both locally or systemically which confer defence before and a stronger response after infection. Immune signalling pathways regulate the gene expression of defensins. These pathways include cellular receptors, which recognise pathogen-associated molecular patterns and are found both in plants and animals. After recognition, signalling pathways and, subsequently, transcriptional factors are activated. There is an increasing number of novel functions in defensins, such as immunomodulators and immune cell attractors. Identification of defensin triggers could help us to elucidate other new functions. The present article reviews the different elicitors of defensins with a main focus on human, fish and marine invertebrate defensins.


Subject(s)
Defensins/metabolism , Pore Forming Cytotoxic Proteins/metabolism , Animals , Chemotaxis , Defensins/genetics , Fishes , Fungi , Gene Expression Regulation , Humans , Immunity, Innate , Immunomodulation , Plants , Pore Forming Cytotoxic Proteins/genetics , Signal Transduction
3.
Molecules ; 24(16)2019 Aug 16.
Article in English | MEDLINE | ID: mdl-31426277

ABSTRACT

Multidrug resistance (MDR) causes challenging tasks in medicine. Human cancer cells, as well as microorganisms, can acquire multiresistance due to the up-regulation of efflux pumps (ABC transporters) and are difficult to treat. Here, we evaluated the effects of chlorophyll, the most abundant pigment on the globe, and its derivative, pheophytin, on cancer cells and methicillin-resistant Staphylococcus aureus (MRSA). We found that both substances have significant reversal effects on multidrug-resistant CEM/ADR5000 cells (RRpheophytin = 3.13, combination index (CI)pheophytin = 0.438; RRchlorophyll = 2.72, CIchlorophyll < 0.407), but not on drug-sensitive CCRF-CEM cells when used in combination with doxorubicin. This indicates that the porphyrins could interact with efflux pumps. Strong synergism was also observed in antimicrobial tests against MRSA when combining ethidium bromide with chlorophyll (FICI = 0.08). As there is a strong need for new drugs in order to reliably treat MDR cells, our research provides potential candidates for further investigation.


Subject(s)
Anti-Bacterial Agents/pharmacology , Antineoplastic Agents/pharmacology , Chlorophyll/pharmacology , Doxorubicin/pharmacology , Drug Resistance, Neoplasm/drug effects , Ethidium/pharmacology , Pheophytins/pharmacology , Cell Line, Tumor , Cell Survival/drug effects , Drug Combinations , Drug Resistance, Multiple/drug effects , Drug Synergism , Humans , Inhibitory Concentration 50 , Lymphocytes/drug effects , Lymphocytes/pathology , Methicillin-Resistant Staphylococcus aureus/drug effects , Methicillin-Resistant Staphylococcus aureus/growth & development , Microbial Sensitivity Tests
4.
Medicines (Basel) ; 6(2)2019 Mar 30.
Article in English | MEDLINE | ID: mdl-30935079

ABSTRACT

Background: The phytochemical composition, antioxidant, cytotoxic, and antimicrobial activities of a methanol extract from Glycyrrhiza glabra L. (Ge), a 50% ethanol (in water) extract from Paeonia lactiflora Pall. (Pe), and a 96% ethanol extract from Eriobotrya japonica (Thunb.) Lindl. (Ue) were investigated. Methods: The phytochemical profiles of the extracts were analyzed by LC-MS/MS. Antioxidant activity was evaluated by scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals and reducing ferric complexes, and the total phenolic content was tested with the Folin⁻Ciocalteu method. Cytotoxicity was determined with a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay in murine macrophage RAW 264.7 cells. Antimicrobial activity of the three plant extracts was investigated against six bacterial strains with the broth microdilution method. Results: Only Pe showed high antioxidant activities compared to the positive controls ascorbic acid and (-)-epigallocatechin gallate (EGCG) in DPPH assay; and generally the antioxidant activity order was ascorbic acid or EGCG > Pe > Ue > Ge. The three plant extracts did not show strong cytotoxicity against RAW 264.7 cells after 24 h treatment with IC50 values above 60.53 ± 4.03 µg/mL. Ue was not toxic against the six tested bacterial strains, with minimal inhibitory concentration (MIC) values above 5 mg/mL. Ge showed medium antibacterial activity against Acinetobacter bohemicus, Kocuria kristinae, Micrococcus luteus, Staphylococcus auricularis, and Bacillus megaterium with MICs between 0.31 and 1.25 mg/mL. Pe inhibited the growth of Acinetobacter bohemicus, Micrococcus luteus, and Bacillus megaterium at a MIC of 0.08 mg/mL. Conclusions: The three extracts were low-cytotoxic, but Pe exhibited effective DPPH radical scavenging ability and good antibacterial activity; Ue did not show antioxidant or antibacterial activity; Ge had no antioxidant potential, but medium antibacterial ability against five bacteria strains. Pe and Ge could be further studied for their potential to be developed as antioxidant or antibacterial candidates.

5.
Syst Appl Microbiol ; 42(2): 198-204, 2019 Mar.
Article in English | MEDLINE | ID: mdl-30514593

ABSTRACT

Although birds are hosts to a large number of microorganisms, microbes have rarely been found in avian oil glands. Here, we report on two strains of a new bacterial species from the preen oil of American barn owls (Tyto furcata). Phenotypic as well as genotypic methods placed the isolates to the genus Kocuria. Strains are non-fastidious, non-lipophilic Gram-positive cocci and can be unambiguously discriminated from their closest relative Kocuria rhizophila DSM 11926T. In phylogenetic trees, the owl bacteria formed a distinct cluster which was clearly separated from all other known Kocuria species. The same conclusion was drawn from MALDI-TOF MS analyses. Once again, the new bacterial strains were very similar to one another, but exhibited substantial differences when compared to the most closely related species. Besides, the results of the biochemical tests, optimum growth conditions and pigmentation differed from closely related Kocuria spp. Finally, ANIb values of less than 87% provided striking evidence that the isolates recovered from American barn owls represent a hitherto undescribed species, for which we propose the name Kocuria tytonicola sp. nov. The type strain is 489T (DSM 104133T=LMG 29945T, taxonumber TA00340).


Subject(s)
Micrococcaceae/classification , Phylogeny , Strigiformes/microbiology , Animals , Bacterial Typing Techniques , Base Composition , DNA, Bacterial/genetics , Fatty Acids/chemistry , Germany , Micrococcaceae/isolation & purification , Phospholipids/chemistry , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , Vitamin K 2/analogs & derivatives , Vitamin K 2/chemistry
6.
Int J Syst Evol Microbiol ; 69(2): 447-451, 2019 Feb.
Article in English | MEDLINE | ID: mdl-30556804

ABSTRACT

Avian uropygial glands have received increasing attention in recent years, but little is known about micro-organisms in uropygial glands. In this study, we isolated a strain of Gram-stain-positive, non-motile, non-spore-forming cocci, designated 442T, from the uropygial gland of an American barn owl (Tyto furcata) and characterized it using a polyphasic approach. 16S rRNA gene sequence analysis placed the isolate in the genus Kocuria. The G+C content was 70.8 mol%, the major menaquinone was MK-7(H2) and the predominant cellular fatty acids were anteiso-C15 : 0, anteiso-C17 : 0 and iso-C15 : 0. Phylogenetic analyses based on the 16S rRNA gene identified Kocuria rhizophila DSM 11926T (99.6 % similarity), Kocuria salsicia DSM 24776T (98.7 %), Kocuria varians DSM 20033T (98.3 %) and Kocuria marina DSM 16420T (98.3 %) as the most closely related species. However, average nucleotide identity values below 86 % indicated that the isolate differed from all species hitherto described. Chemotaxonomic analyses and whole-cell protein profiles corroborated these findings. Accordingly, the isolate is considered to be a member of a novel species, for which the name Kocuria tytonis sp. nov. is proposed. The type strain is 442T (=DSM 104130T=LMG 29944T).


Subject(s)
Animal Structures/microbiology , Micrococcaceae/classification , Phylogeny , Strigiformes/microbiology , Animals , Bacterial Typing Techniques , Base Composition , DNA, Bacterial/genetics , Fatty Acids/chemistry , Germany , Micrococcaceae/isolation & purification , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , United States , Vitamin K 2/analogs & derivatives , Vitamin K 2/chemistry
7.
PLoS One ; 13(10): e0205509, 2018.
Article in English | MEDLINE | ID: mdl-30308015

ABSTRACT

Antimicrobial peptides (AMPs) are short and generally positively charged peptides found in a wide variety of organisms. CSαß defensins are a group of AMPs. These defensins are composed of an α-helix and a ß-sheet linked by three or four disulphide bridges. In this study, we describe the antimicrobial activity of an anionic CSαß fungal defensin from Aspergillus fumigatus, AfusinC. AfusinC was recombinantly produced as a fusion protein in Escherichia coli. The tag was removed by proteolytic cleavage, and AfusinC was purified by size exclusion chromatography. About 0.8 mg of recombinant AfusinC was obtained from 1 L of culture. Recombinant AfusinC was active against mainly gram-positive bacteria including human pathogens and a multiresistant-strain of A. aureus. Additionally, AfusinC showed bactericidal effect against Micrococcus luteus.


Subject(s)
Anti-Bacterial Agents/pharmacology , Gram-Positive Bacteria/drug effects , Recombinant Proteins/pharmacology , Anti-Bacterial Agents/isolation & purification , Aspergillus fumigatus , Escherichia coli , Microbial Sensitivity Tests , Recombinant Proteins/genetics , Recombinant Proteins/isolation & purification
8.
Syst Appl Microbiol ; 41(6): 564-569, 2018 Nov.
Article in English | MEDLINE | ID: mdl-29958724

ABSTRACT

Two strains (pedersoliT and girotti) of a new species of bacteria were isolated from the preen glands of wild Egyptian geese (Alopochen aegyptiacus) from the river Neckar in southern Germany in two subsequent years. The strains were lipophilic, fastidious, Gram-positive rods and belonged to the genus Corynebacterium. Phylogenetically, the isolates were most closely related to Corynebacterium falsenii DSM 44353T which has been found to be associated with birds before. 16S rRNA gene sequence similarity to all known Corynebacterium spp. was significantly <97%. Corresponding values of rpoB showed low levels of similarity <87% and ANIb was <73%. G+C content of the genomic DNA was 65.0mol% for the type strain of the goose isolates, as opposed to 63.2mol% in Corynebacterium falsenii. MALDI-TOF MS analysis of the whole-cell proteins revealed patterns clearly different from the related species, as did biochemical tests, and polar lipid profiles. We therefore conclude that the avian isolates constitute strains of a new species, for which the name Corynebacterium heidelbergense sp. nov. is proposed. The type strain is pedersoliT (=DSM 104638T=LMG 30044T).


Subject(s)
Corynebacterium/classification , Geese/microbiology , Phylogeny , Sebaceous Glands/microbiology , Animals , Bacterial Typing Techniques , Base Composition , Corynebacterium/genetics , Corynebacterium/isolation & purification , DNA Fingerprinting , DNA, Bacterial/genetics , Fatty Acids/chemistry , Germany , Grooming , Nucleic Acid Hybridization , Phospholipids/chemistry , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA
9.
FEMS Microbiol Ecol ; 94(9)2018 09 01.
Article in English | MEDLINE | ID: mdl-29901706

ABSTRACT

The function of uropygial glands (preen glands) has been subject to controversial debates. In this study, we evaluated the antimicrobial potential of preen gland secretions of turkeys (Meleagris gallopavo) against 18 microbial strains by means of diffusion tests, broth microdilutions, checkerboard assays and time-kill curves. Furthermore, we tested the hypothesis that lipids exert direct antimicrobial effects on pathogens. Moreover, we checked for mutualistic relationships between the preen gland bacterium Corynebacterium uropygiale with its hosts. We found that preen gland secretions significantly inhibited the growth of a broad spectrum of bacteria and fungi, particularly when combined with keratinase. Combinations effectively killed multidrug resistant microorganisms in a strongly synergistic manner. Since feather-degrading microorganisms (FDM) express keratinase and thereby disrupt the integrity of the plumage, our data suggests that preen gland secretions of turkeys are specifically activated in the presence of FDM, and specifically eliminate FDM from feathers. However, antimicrobial effects did not originate from lipids, but were mediated by highly polar compounds which might be antimicrobial peptides (AMPs). Finally, C. uropygiale is apparently not involved in the antimicrobial activity of preen gland secretions of turkeys. In conclusion, our results suggest that turkeys can antagonize FDM by amplifying the antimicrobial properties of their preen gland secretions.


Subject(s)
Anti-Infective Agents/metabolism , Antimicrobial Cationic Peptides/metabolism , Bacteria/drug effects , Feathers/metabolism , Fungi/drug effects , Sebaceous Glands/metabolism , Turkeys/microbiology , Animals , Birds/microbiology , Drug Resistance, Multiple, Bacterial/drug effects , Drug Resistance, Multiple, Fungal/drug effects , Feathers/microbiology , Peptide Hydrolases/metabolism
10.
Medicines (Basel) ; 5(2)2018 Apr 21.
Article in English | MEDLINE | ID: mdl-29690511

ABSTRACT

Background: Garlics and onions have been used for the treatment of diseases caused by parasites and microbes since ancient times. Trypanosomiasis and leishmaniasis are a concern in many areas of the world, especially in poor countries. Methods:Trypanosoma brucei brucei and Leishmania tarentolae were used to investigate the anti-parasitic effects of dichloromethane extracts of Allium sativum (garlic) and Allium cepa (onion) bulbs. As a confirmation of known antimicrobial activities, they were studied against a selection of G-negative, G-positive bacteria and two fungi. Chemical analyses were performed using high-performance liquid chromatography (HPLC) and electrospray ionization-mass spectrometry (LC-ESI-MS/MS). Results: Chemical analyses confirmed the abundance of several sulfur secondary metabolites in garlic and one (zwiebelane) in the onion extract. Both extracts killed both types of parasites efficiently and inhibited the Trypanosoma brucei trypanothione reductase irreversibly. In addition, garlic extract decreased the mitochondrial membrane potential in trypanosomes. Garlic killed the fungi C. albicans and C. parapsilosis more effectively than the positive control. The combinations of garlic and onion with common trypanocidal and leishmanicidal drugs resulted in a synergistic or additive effect in 50% of cases. Conclusion: The mechanism for biological activity of garlic and onion appears to be related to the amount and the profile of sulfur-containing compounds. It is most likely that vital substances inside the parasitic cell, like trypanothione reductase, are inhibited through disulfide bond formation between SH groups of vital redox compounds and sulfur-containing secondary metabolites.

11.
Molecules ; 23(3)2018 Feb 27.
Article in English | MEDLINE | ID: mdl-29495517

ABSTRACT

The tree popularly known in Brazil as mulateiro or pau-mulato (Calycophyllum spruceanum (Benth.) K. Schum.) is deeply embedded in the herbal medicine of the Amazon region. Different preparations of the bark are claimed to have anti-aging, antioxidant, antimicrobial, emollient, wound healing, hemostatic, contraceptive, stimulant, and anti-diabetic properties. The current study aims to provide the first step towards a science-based evidence of the beneficial effects of C. spruceanum in the promotion of longevity and in the modulation of age-related markers. For this investigation, we used the model system Caenorhabditis elegans to evaluate in vivo antioxidant and anti-aging activity of a water extract from C. spruceanum. To chemically characterize the extract, HPLC MS (High Performance Liquid Chromatography Mass Spectrometry)/MS analyses were performed. Five secondary metabolites were identified in the extract, namely gardenoside, 5-hydroxymorin, cyanidin, taxifolin, and 5-hydroxy-6-methoxycoumarin-7-glucoside. C. spruceanum extract was able to enhance stress resistance and to extend lifespan along with attenuation of aging-associated markers in C. elegans. The demonstrated bioactivities apparently depend on the DAF-16/FOXO pathway. The data might support the popular claims of mulateiro as the "tree of youth", however more studies are needed to clarify its putative benefits to human health.


Subject(s)
Adaptation, Biological/drug effects , Caenorhabditis elegans/drug effects , Caenorhabditis elegans/physiology , Longevity/drug effects , Plant Extracts/chemistry , Plant Extracts/pharmacology , Plants, Medicinal/chemistry , Rubiaceae/chemistry , Stress, Physiological/drug effects , Animals , Anti-Infective Agents/chemistry , Anti-Infective Agents/pharmacology , Antioxidants/chemistry , Antioxidants/pharmacology , Caenorhabditis elegans Proteins/genetics , Chromatography, High Pressure Liquid , Gene Expression Regulation/drug effects , Microbial Sensitivity Tests , Phytochemicals , Quantitative Trait, Heritable , Reactive Oxygen Species/metabolism
12.
Molecules ; 23(2)2018 Feb 02.
Article in English | MEDLINE | ID: mdl-29393867

ABSTRACT

Garlic has played an important role in culinary arts and remedies in the traditional medicine throughout human history. Parasitic infections represent a burden in the society of especially poor countries, causing more than 1 billion infections every year and leading to around one million deaths. In this study, we investigated the mode of anti-parasitic activity of "wild garlics" Tulbaghia violacea and Allium ursinum dichloromethane extracts against parasites Trypanosoma brucei brucei and Leishmania tarentolae with regard to their already known antimicrobial activity. We also evaluated their cytotoxic potential against human cells. Both extracts showed a relevant trypanocidal and leishmanicidal activity, although L. tarentolae was less sensitive. We determined that the probable mode of action of both extracts is the irreversible inhibition of the activity of Trypanosoma brucei trypanothione reductase enzyme. The extracts showed a mild cytotoxic activity against human keratinocytes. They also exhibited weak-in most cases comparable-antibacterial and antifungal activity. HPLC-MS/MS analysis showed that both extracts are abundant in sulfur compounds. Thus, for the first time, the ability of Allium ursinum and Tulbaghia violacea to kill Trypanosoma sp. and Leishmania sp. parasites, probably by binding to and inactivating sulfur-containing compounds essential for the survival of the parasite, is shown.


Subject(s)
Allium/chemistry , Antiprotozoal Agents/pharmacology , Leishmania/drug effects , NADH, NADPH Oxidoreductases/antagonists & inhibitors , Plant Extracts/chemistry , Trypanosoma brucei brucei/drug effects , Anti-Infective Agents/chemistry , Anti-Infective Agents/pharmacology , Antiprotozoal Agents/chemistry , Candida albicans/drug effects , Candida albicans/growth & development , Cell Line , Cell Survival/drug effects , Chromatography, High Pressure Liquid , Dose-Response Relationship, Drug , Humans , Keratinocytes/cytology , Keratinocytes/drug effects , Leishmania/growth & development , Methicillin-Resistant Staphylococcus aureus/drug effects , Methicillin-Resistant Staphylococcus aureus/growth & development , Microbial Sensitivity Tests , NADH, NADPH Oxidoreductases/metabolism , Protozoan Proteins/antagonists & inhibitors , Protozoan Proteins/metabolism , Secondary Metabolism/physiology , Tandem Mass Spectrometry , Trypanosoma brucei brucei/growth & development
13.
Compr Rev Food Sci Food Saf ; 17(3): 769-791, 2018 May.
Article in English | MEDLINE | ID: mdl-33350123

ABSTRACT

Fumonisins are mycotoxins mainly produced by Fusarium proliferatum and Fusarium verticillioides. Because of their wide distribution, the potential health hazard, and economic significance, they are considered one of the most important mycotoxin classes. Epidemiological evidence suggests a relationship between the Fusarium load in corn, exposure to fumonisins, and esophageal cancer. However, mechanisms of actions of fumonisins are not yet fully resolved and epidemiological studies suffer from various confounding factors. Correspondingly, the most relevant congener of the fumonisin family (fumonisin B1 ) has been classified as possibly carcinogenic to humans and maximum limits have been set for corn and corn-based products. However, many non-corn-based products are also susceptible to fumonisin contamination. Indeed, some of them contain very high amounts of fumonisins, but enter the market legally. Furthermore, fumonisin exposure of consumers is probably consistently being underestimated because only a fraction of fumonisins can be detected by routine analysis. The bioavailability and toxicity of most nondetectable (cryptic) forms has not been resolved. In this work, we review the developments of cancer research into fumonisins since their discovery in 1988 until today and provide an overview of the contributions of various foodstuffs to fumonisin exposure, including those products that have been largely neglected in the past. In conclusion, (1) corn remains the principal source of fumonisin ingestion, but fumonisins in non-corn-based commodities require continuous monitoring; (2) cryptic fumonisins should be included in risk assessment studies; and (3) certain population groups (for example children) may suffer from enhanced exposure and could face increased health risks.

14.
Syst Appl Microbiol ; 41(1): 38-43, 2018 Jan.
Article in English | MEDLINE | ID: mdl-29169691

ABSTRACT

Two new species of Gram-positive cocci were isolated from the uropygial glands of wild woodpeckers (Dendrocopos major) originating from different locations in Germany. A polyphasic approach confirmed the affiliation of the isolates to the genus Kocuria. Phylogenetic analysis based on the 16S rRNA gene showed high degree of similarity to Kocuria koreensis DSM 23367T (99.0% for both isolates). However, low ANIb values of <80% unequivocally separated the new species from K. koreensis. This finding was further corroborated by DNA fingerprinting and analysis of polar lipid profiles. Furthermore, growth characteristics, biochemical tests, MALDI-TOF MS analysis, and G+C contents clearly differentiated the isolates from their known relatives. Besides, the woodpecker isolates significantly differed from each other in their whole-cell protein profiles, DNA fingerprints, and ANIb values. In conclusion, the isolated microorganisms constitute members of two new species, for which the names Kocuria uropygioeca sp. nov. and Kocuria uropygialis sp. nov. are proposed. The type strains are 36T (DSM 101740T=LMG 29265T) and 257T (=DSM 101741T=LMG 29266T) for K. uropygialis sp. nov. and K. uropygioeca sp. nov., respectively.


Subject(s)
Birds/microbiology , Exocrine Glands/microbiology , Micrococcaceae/classification , Micrococcaceae/isolation & purification , Animals , Bacterial Proteins/analysis , Bacterial Typing Techniques , Base Composition , Cluster Analysis , Cytosol/chemistry , DNA Fingerprinting , DNA, Bacterial/chemistry , DNA, Bacterial/genetics , DNA, Ribosomal/chemistry , DNA, Ribosomal/genetics , Germany , Micrococcaceae/genetics , Phospholipids/analysis , Phylogeny , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
15.
Angew Chem Int Ed Engl ; 56(48): 15246-15251, 2017 11 27.
Article in English | MEDLINE | ID: mdl-28960676

ABSTRACT

A negatively charged poly(para-phenyleneethynylene) (PPE) forms electrostatic complexes with four positively charged antimicrobial peptides (AMP). The AMPs partially quench the fluorescence of the PPE and discriminate fourteen different bacteria in water and in human urine by pattern-based fluorescence recognition; the AMP-PPE complexes bind differentially to the components of bacterial surfaces. The bacterial species and strains form clusters according to staining properties (Gram-positive and Gram-negative) or genetic similarity (genus, species, and strain). The identification and data treatment is performed by pattern evaluation with linear discriminant analysis (LDA) of the collected fluorescence intensity data.


Subject(s)
Alkynes/chemistry , Antimicrobial Cationic Peptides/chemistry , Escherichia coli/chemistry , Escherichia coli/isolation & purification , Ethers/chemistry , Micrococcaceae/chemistry , Micrococcaceae/isolation & purification , Urine/microbiology , Discriminant Analysis , Fluorescence , Humans , Static Electricity
16.
Mol Phylogenet Evol ; 113: 113-125, 2017 08.
Article in English | MEDLINE | ID: mdl-28533084

ABSTRACT

The Hoopoe (Upupa epops epops) breeds widely in Eurasia and most populations migrate to Africa during the boreal winter. To date, data regarding its phylogeography in Europe are missing. In this study, we investigated the phylogeography and population genetics of Hoopoes by means of mitochondrial DNA (mtDNA) sequencing as well as microsatellite genotyping. Our analyses revealed 32 haplotypes in the cytochrome c oxidase subunit I (COI) (269 individuals) and 50 haplotypes in cytochrome b (cyt b) (233 individuals). Analyses of mtDNA clearly demonstrated that the bulk of variance (98.23%) could be attributed to inner-population variance. Thus, the low frequency single nucleotide substitutions resulted in "star-like" haplotype networks without define geographical structure. Hoopoes clearly experienced a bottleneck followed by sudden expansion, as was also apparent from tests on the unimodal mismatch, Bayesian skyline plot, significant negative neutrality tests as well as bottleneck signals. These tests pointed to strong demographic fluctuations in the hoopoe populations. GENELAND, DAPC and STRUCTURE analyses of microsatellites along with their corresponding Fst values suggested that current genetic restriction separates birds from Armenia from the remaining populations. Except for hoopoes from Armenia, all the European populations exhibited an admixed phylogeographic pattern. We conclude that this genetic panmixia might be a consequence of a combination of historical events (e.g. repeated colonizations and retreatments from northern habitats during the Pleistocene and a sudden postglacial expansion) and current processes (e.g. long-distance migration, immigration or population recruitments).


Subject(s)
Birds/genetics , Gene Flow , Genetic Drift , Genetic Variation , Phylogeography , Africa , Animal Migration , Animals , Base Sequence , Bayes Theorem , Breeding , Cluster Analysis , Cytochromes b/genetics , DNA, Mitochondrial/genetics , Ecosystem , Europe , Gene Regulatory Networks , Genetics, Population , Haplotypes/genetics , Microsatellite Repeats/genetics , Phylogeny , Principal Component Analysis
17.
Chem Biodivers ; 13(11): 1537-1550, 2016 Nov.
Article in English | MEDLINE | ID: mdl-27447784

ABSTRACT

The essential oil compositions of the leaves of three related Myrtaceae species, namely Syzygium aqueum, Syzygium samarangense and Eugenia uniflora, were investigated using GLC/MS and GLC/FID. Altogether, 125 compounds were identified: α-Selinene (13.85%), ß-caryophyllene (12.72%) and ß-selinene constitute the most abundant constituents in S. aqueum. Germacrene D (21.62%) represents the major compound in S. samarangense whereas in E. uniflora, spathulenol (15.80%) represents the predominant component. Multivariate chemometric analyses were used to discriminate the essential oils using hierarchical cluster analysis (HCA) and principal component analysis (PCA) based on the chromatographic results. The antimicrobial activity of the popularly used E. uniflora essential oil was assessed using broth microdilution method against six Gram-positive, three Gram-negative bacteria and two fungi. The oil showed moderate antimicrobial activity against Bacillus licheniformis exhibiting MIC and MMC of 0.63 mg/ml. The cytotoxic activity of E. uniflora essential oil was investigated against Trypanosoma brucei brucei (T. b. brucei) and MCF-7 cancer cell line using MTT assay. It showed moderate activity against MCF-7 cells with an IC50 value of 76.40 µg/ml. On the other hand, T. brucei was highly susceptible to E. uniflora essential oil with IC50 of 11.20 µg/ml, and a selectivity index of 6.82.


Subject(s)
Anti-Bacterial Agents/pharmacology , Antifungal Agents/pharmacology , Antineoplastic Agents, Phytogenic/pharmacology , Antiprotozoal Agents/pharmacology , Eugenia/chemistry , Oils, Volatile/pharmacology , Syzygium/chemistry , Anti-Bacterial Agents/analysis , Antifungal Agents/analysis , Antineoplastic Agents, Phytogenic/analysis , Antiprotozoal Agents/analysis , Cell Proliferation/drug effects , Cluster Analysis , Dose-Response Relationship, Drug , Drug Screening Assays, Antitumor , Fungi/drug effects , Gram-Negative Bacteria/drug effects , Gram-Positive Bacteria/drug effects , Humans , MCF-7 Cells , Microbial Sensitivity Tests , Oils, Volatile/analysis , Parasitic Sensitivity Tests , Plant Leaves/chemistry , Principal Component Analysis , Structure-Activity Relationship , Trypanosoma brucei brucei/drug effects
18.
Syst Appl Microbiol ; 39(2): 88-92, 2016 Mar.
Article in English | MEDLINE | ID: mdl-26776107

ABSTRACT

A novel species of fastidious, lipophilic, club-shaped, Gram-positive bacteria was recovered from the preen glands of healthy Turkeys (Meleagris gallopavo) from two different locations. Phylogenetic analysis of the 16S rRNA gene showed highest similarity to Corynebacterium spheniscorum DSM 44757(T) (96.8%) with a 3.2kb stretch of rpoB sharing 82.4% sequence similarity to the same species. DNA fingerprinting by ERIC-PCR and polar lipid profiles clearly differentiated the Turkey isolates from the most closely related Corynebacteria, as did MALDI-TOF MS analysis. Chemotaxonomic tests revealed the presence of corynemycolic acids with C16:0, C18:0, C18:1ω9c and tuberculostearic acid as the major cellular fatty acids. The G+C content of the type strain was 60.7 mol%. The species was susceptible to ampicillin, kanamycin A, streptomycin, amikacin, polymyxin B and vancomycin. From our results, it becomes evident that the isolated organisms represent a new species, for which the name Corynebacterium uropygiale sp. nov. is proposed. The type strain is Iso10(T) (=DSM 46817(T)=LMG 28616(T)).


Subject(s)
Corynebacterium Infections/veterinary , Corynebacterium/classification , Turkeys/microbiology , Animals , Anti-Bacterial Agents/pharmacology , Bacterial Typing Techniques , Corynebacterium/drug effects , Corynebacterium/genetics , Corynebacterium/isolation & purification , Genes, Bacterial , Microbial Sensitivity Tests , Phylogeny , Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
19.
Foods ; 4(4): 645-653, 2015 Nov 02.
Article in English | MEDLINE | ID: mdl-28231227

ABSTRACT

Antimicrobial, antioxidant, and anti-inflammatory activities of the essential oils of 18 plant species from Tajikistan (Central Asia) were investigated. The essential oil of Origanum tyttanthum showed a strong antibacterial activity with both minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of 312.5 µg/mL for E. coli, 625 µg/mL (MIC) and 1250 µg/mL (MBC) for MRSA (methicillin-resistant Staphylococcus aureus), respectively. The essential oil of Galagania fragrantissima was highly active against MRSA at concentrations as low as 39.1 µg/mL and 78.2 µg/mL for MIC and MBC, respectively. Origanum tyttanthum essential oil showed the highest antioxidant activity with IC50 values of 0.12 mg/mL for ABTS (2,2'-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid)) and 0.28 mg/mL for DPPH (2,2-diphenyl-1-picrylhydrazyl).Galagania fragrantissima and Origanum tyttanthum essential oils showed the highest anti-inflammatory activity; IC50 values of 5-lipoxygenase (5-LOX) inhibition were 7.34 and 14.78 µg/mL, respectively. In conclusion, essential oils of Origanumtyttanthum and Galagania fragrantissima exhibit substantial antimicrobial, antioxidant, and anti-inflammatory activities. They are interesting candidates in phytotherapy.

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