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extract against isolates of methicillin- resistant Staphylococcus aureus

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https://www.readbyqxmd.com/read/29674105/ilicicolinic-acids-and-ilicicolinal-derivatives-from-the-fungus-neonectria-discophora-snb-cn63-isolated-from-the-nest-of-the-termite-nasutitermes-corniger-found-in-french-guiana-show-antimicrobial-activity
#1
Jonathan Sorres, Abir Sabri, Orianne Brel, Didier Stien, Véronique Eparvier
The fungus Neonectria discophora SNB-CN63 has been isolated from the nest of the termite Nasutitermes corniger found in French Guiana. From the ethyl acetate extract of fungal culture, bioassay guided fractionation led to the isolation of fourteen ilicicolinic acids and ilicicolinal derivatives. Their structures were elucidated by analyses of 1D and 2D NMR and MS spectroscopic data. All metabolites were tested against several microbial pathogens and six displayed antimicrobial activities with MIC <16 μg/mL on T...
April 16, 2018: Phytochemistry
https://www.readbyqxmd.com/read/29577744/aromatic-compounds-produced-by-endophytic-fungi-isolated-from-red-alga-asparagopsis-taxiformis-falkenbergia-stage
#2
Rebeca P Medina, Angela R Araujo, Raymond J Andersen, Marcos A Soares, Fabio de A Silva, Dulce H S Silva
Endophytic fungi were isolated from red alga Asparagopsis taxiformis - Falkenbergia stage, collected from the Brazilian coast, and were identified as Annulohypoxylon stygium (AT-03) and A. yungensis (AT-06) based on their macro/micromorphological and molecular features. Bioassay-guided fractionation of the EtOAc extract from laboratory cultures of both strains yielded known compounds pyrogallol from A. stygium, (3R)-scytalone and (3R,4R)-4-hydroxy-scytalone from A. yungensis. Pyrogallol was active against methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli strains...
March 26, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29567247/antibacterial-activity-of-propolins-from-taiwanese-green-propolis
#3
Yue-Wen Chen, Siou-Ru Ye, Chieh Ting, Yu-Hsiang Yu
Taiwanese green propolis is a prenylated flavonoid rich honeybee product and propolins isolated from Taiwanese green propolis exert a broad spectrum of biological activities, such as anti-cancer and anti-oxidant. However, the anti-bacterial effects of Taiwanese green propolis or propolins are still poorly understood. In the current study, the antibacterial effects of Taiwanese green propolis and propolins were evaluated. Results show that the maximum dry matter yields of Taiwanese green propolis were observed in the 95% and 99...
April 2018: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/29547589/phocoenamicins-b-and-c-new-antibacterial-spirotetronates-isolated-from-a-marine-micromonospora-sp
#4
Mercedes Pérez-Bonilla, Daniel Oves-Costales, Mercedes de la Cruz, Maria Kokkini, Jesús Martín, Francisca Vicente, Olga Genilloud, Fernando Reyes
Phocoenamicins B and C ( 1 and 2 ), together with the known spirotetronate phocoenamicin ( 3 ), were isolated from cultures of Micromonospora sp. The acetone extract from a culture of this strain, isolated from marine sediments collected in the Canary Islands, displayed activity against methicillin-resistant Staphylococcus aureus (MRSA), Mycobacterium tuberculosis H37Ra and Mycobacterium bovis . Bioassay-guided fractionation of this extract using SP207ss column chromatography and preparative reversed-phased HPLC led to the isolation of the new compounds 1 and 2 belonging to the spirotetronate class of polyketides...
March 16, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29497981/bioprospecting-of-diaporthe-terebinthifolii-lgmf907-for-antimicrobial-compounds
#5
Aliandra G de Medeiros, Daiani C Savi, Prithiba Mitra, Khaled A Shaaban, Amit K Jha, Jon S Thorson, Jürgen Rohr, Chirlei Glienke
Antibiotic-resistant bacteria have been observed with increasing frequency over the past decades, driving the search for new drugs and stimulating the interest in natural products sources. Endophytic fungi from medicinal plants represent a great source of novel bioactive compounds useful to pharmaceutical and agronomical purposes. Diaporthe terebinthifolii is an endophytic species isolated from Schinus terebinthifolius, a plant used in popular medicine for several health problems. The strain D. terebinthifolii LGMF907 was previously reported by our group to produce secondary metabolites with biological activity against phytopathogens...
March 1, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29433688/synergism-of-prenylflavonoids-from-morus-alba-root-bark-against-clinical-mrsa-isolates
#6
Guo-Ying Zuo, Cui-Xian Yang, Jun Han, Yu-Qing Li, Gen-Chun Wang
BACKGROUND: Clinical methicillin-resistant Staphylococcus aureus (MRSA) is a thorny problem in current anti-infective therapeutics and a challenge of new drug development. Plant prenylflavonoids possess anti-MRSA activity, but few of the prenylflavonoids have been reported the synergistic anti-MRSA effect when they are used in combination with conventional antibacterial agents. PURPOSE: This study deals with anti-MRSA activity of four prenylflavonoids from the root bark of Morus alba and their synergism with 11 conventional antibacterial agents...
January 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29411643/mdn-0171-a-new-medermycin-analogue-from-streptomyces-albolongus-ca-186053
#7
Rodney Lacret, Daniel Oves-Costales, Ignacio Pérez-Victoria, Mercedes de la Cruz, Caridad Díaz, Francisca Vicente, Olga Genilloud, Fernando Reyes
A new medermycin derivative, MDN-0171 (1), and two known structurally related compounds, medermycin (2) and antibiotic G15-F (3) were isolated from the acetone extract of culture broths of the marine-derived Streptomyces albolongus strain CA-186053. Their structures were determined using a combination of spectroscopic techniques, including 1D and 2D NMR and electrospray-time of flight mass spectrometry (ESI-TOF MS). Compounds 2 and 3 accounted for the antimicrobial activity (against methicillin-resistant Staphylococcus aureus and Escherichia coli) previously detected in the crude extract of this actinomycete...
February 7, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29392557/the-antimicrobial-potential-of-a-new-derivative-of-cathelicidin-from-bungarus-fasciatus-against-methicillin-resistant-staphylococcus-aureus
#8
Mercedeh Tajbakhsh, Abdollah Karimi, Abolghasem Tohidpour, Naser Abbasi, Fatemeh Fallah, Maziar Mohammad Akhavan
Cathelicidins are a family of antimicrobial peptides which exhibit broad antimicrobial activities against antibiotic-resistant bacteria. Considering the progressive antibiotic resistance, cathelicidin is a candidate for use as an alternative approach to treat and overcome the challenge of antimicrobial resistance. Cathelicidin-BF (Cath-BF) is a short antimicrobial peptide, which was originally extracted from the venom of Bungarus fasciatus. Recent studies have reported that Cath-BF and some related derivatives exert strong antimicrobial and weak hemolytic properties...
February 2018: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/29216824/use-of-a-mixed-culture-strategy-to-isolate-halophilic-bacteria-with-antibacterial-and-cytotoxic-activity-from-the-manaure-solar-saltern-in-colombia
#9
Natalia Conde-Martínez, Alejandro Acosta-González, Luis E Díaz, Edisson Tello
BACKGROUND: Water evaporation in solar salterns creates salinity gradients that promote the adaptation of microbial species to different salinities. This competitive habitat challenges the metabolic capabilities of microorganisms and promotes alterations in their production of secondary metabolites. Thus, solar salterns are a potentially important source of new natural products. In Colombia, the most important and representative solar saltern is located in Manaure (La Guajira) in the north of Colombia...
December 8, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/29200950/isolation-and-determination-of-four-potential-antimicrobial-components-from-pseudomonas-aeruginosa-extracts
#10
Ling-Qing Xu, Jian-Wen Zeng, Chong-He Jiang, Huan Wang, Yu-Zhen Li, Wei-Hong Wen, Jie-Hua Li, Feng Wang, Wei-Jen Ting, Zi-Yong Sun, Chih-Yang Huang
Background: Pseudomonas aeruginos a can cause disease and also can be isolated from the skin of healthy people. Additionally, it exhibits certain antimicrobial effects against other microorganisms . Methods: We collected 60 strains of P. aeruginosa and screened their antimicrobial effects against Staphylococcus aureus (ATCC 25923) using the filter paper-disk method, the cross-streaking method and the co-culture method and then evaluated the antimicrobial activity of the chloroform-isolated S. aureus extracts against methicillin-resistant S...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29146256/isolation-purification-structural-elucidation-and-antimicrobial-activities-of-kocumarin-a-novel-antibiotic-isolated-from-actinobacterium-kocuria-marina-cmg-s2-associated-with-the-brown-seaweed-pelvetia-canaliculata
#11
Bushra Uzair, Farid Menaa, Barkat Ali Khan, Faryal Vali Mohammad, Viqar Uddin Ahmad, Ryad Djeribi, Bouzid Menaa
AIMS: Screening of seaweed-associated bacteria capable of producing antimicrobials. METHODS AND RESULTS: Fifteen microbial strains, associated to the brown seaweed Pelvetia canaliculata (Linnaeus) attached to the rocks of Sonmiani Beach (Karachi, Pakistan), were screened. Crude extract filtrates of CMG S2 strain grew on Zobell marine agar (ZMA) had the most remarkable antimicrobial activity. Based on its phenotypic aspects (e.g. Gram-positive, microccoid form), biochemical characteristics (e...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29134292/simultaneous-determination-of-brazilin-and-protosappanin-b-in-caesalpinia-sappan-by-ionic-liquid-dispersive-liquid-phase-microextraction-method-combined-with-hplc
#12
Zhaoyang Xia, Dongdong Li, Qing Li, Yan Zhang, Wenyi Kang
The conditions of heating, ionic liquid-based ultrasonic-assisted extraction combined with reverse-phase high performance liquid chromatography were optimized to simultaneously isolate and determinate brazilin and protosappanin B in Caesalpinia sappan. Ionic liquids, including [BMIM]Br, [BMIM]BF4 , [BMIM]PF6 and [HMIM]PF6 , were selected as extraction solvents while methanol, acetone, acetonitrile, ethanol and water were selected as dispersants. The chromatographic column was Purospher star RP-C18 (250 mm × 4...
November 13, 2017: Chemistry Central Journal
https://www.readbyqxmd.com/read/29107142/antibacterial-activity-and-cytotoxicity-of-pterocarpus-erinaceus-poir-extracts-fractions-and-isolated-compounds
#13
Nassifatou Koko Tittikpina, Frédéric Nana, Stéphane Fontanay, Stéphanie Philippot, Komlan Batawila, Koffi Akpagana, Gilbert Kirsch, Patrick Chaimbault, Claus Jacob, Raphaël Emmanuel Duval
ETHNOPHARMACOLOGICAL RELEVANCE: Pterocarpus erinaceus has been chosen based on ethnobotanical surveys carried out in the Tchamba district of the Republic of Togo. AIM OF THE STUDY: Investigation of the antibacterial as well as cytotoxic activities of whole extracts, fractions and compounds isolated from the leaves, trunk bark and roots of Pterocarpus erinaceus. MATERIALS AND METHODS: Bio-guided fractionation of the raw extracts of plant parts and subsequent isolation of compounds from active fractions using normal phase open column chromatography...
November 6, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29072532/antibacterial-efficacy-of-silver-nanoparticles-and-ethyl-acetate-s-metabolites-of-the-potent-halophilic-marine-bacterium-bacillus-cereus-a30-on-multidrug-resistant-bacteria
#14
Dhayalan Arul, Govindasamy Balasubramani, Velramar Balasubramanian, Thillainathan Natarajan, Pachiappan Perumal
Bacteria are generally responsible for the prevalence of several diseases and pathogenic bacteria are showing increasing resistance to different antibacterials. During the present study an extremophilic bacterium-A30 isolated from the marine waters was characterized and evaluated against four multi-drug resistant (MDR) pathogens, viz; Methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The sensitivity pattern of the selected pathogens was tested with 31 antibiotics...
October 2017: Pathogens and Global Health
https://www.readbyqxmd.com/read/29066382/anti-staphylococcal-properties-of-eichhornia-crassipes-pistacia-vera-and-ziziphus-amole-leaf-extracts-isolates-from-cattle-and-rabbits
#15
Andrea Gutiérrez-Morales, Valente Velázquez-Ordoñez, Ameer Khusro, Abdelfattah Z M Salem, María Elena Estrada-Zúñiga, Mohamed Z M Salem, Benjamin Valladares-Carranza, Cristina Burrola-Aguilar
The desideratum aim of the present context was to assess the biopotency of methanolic extracts of Eichhornia crassipes (E. crassipes), Pistacia vera (P. vera), and Ziziphus amole (Z. amole) leaves against various staphylococcal strains, and to quantify the phenolics as well as saponin content in them. The antibacterial activity of various concentrations (62.5-1000 μg/mL) of plant extracts was tested against control clinical strains (Staphylococcus aureus ATCC 25923, S. aureus ATCC 29213, and S. aureus ATCC 43300), methicillin-resistant S...
December 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29024774/evaluation-of-antibacterial-potential-of-mangrove-sediment-derived-actinomycetes
#16
Suthinee Sangkanu, Vatcharin Rukachaisirikul, Chanwit Suriyachadkun, Souwalak Phongpaichit
Actinomycetes are well-known as the source of bioactive metabolites. In this work, 16 out of 118 (13.6%) isolates of mangrove sediment-derived actinomycetes showed potential antibacterial activity against at least one bacterial strain. Five extracts from isolates AMA11, AMA12 and AMA21 exhibited a broad spectrum antibacterial activity against Staphylococcus aureus ATCC25923, Staphylococcus epidermidis ATCC35984, methicillin-resistant S. aureus (MRSA) SK1, Acinetobacter baumannii NPRC004 and Escherichia coli ATCC25922...
October 9, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29019685/structures-and-antibacterial-properties-of-isorugosins-h-j-oligomeric-ellagitannins-from-liquidambar-formosana-with-characteristic-bridging-groups-between-sugar-moieties
#17
Yuuki Shimozu, Teruo Kuroda, Tomofusa Tsuchiya, Tsutomu Hatano
Three new ellagitannin oligomers, isorugosins H (1), I (2), and J (3), together with 11 known hydrolyzable tannins were isolated from an aqueous acetone extract of the fresh leaves of Liquidambar formosana. Their chemical structures were elucidated based on spectroscopic data and chemical conversion into known hydrolyzable tannins. The bridging mode of the valoneoyl groups between their sugar moieties has been identified only in this plant species. Additionally, the effects of the isorugosins isolated from this species on drug-resistant bacteria were evaluated and showed that isorugosin A (4) exhibited the most potent antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA)...
October 27, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28953997/antimycobacterial-and-antimalarial-activities-of-endophytic-fungi-associated-with-the-ancient-and-narrowly-endemic-neotropical-plant-vellozia-gigantea-from-brazil
#18
Mariana C Ferreira, Charles L Cantrell, David E Wedge, Vívian N Gonçalves, Melissa R Jacob, Shabana Khan, Carlos A Rosa, Luiz H Rosa
BACKGROUND: Endophytic fungi, present mainly in the Ascomycota and Basidiomycota phyla, are associated with different plants and represent important producers of bioactive natural products. Brazil has a rich biodiversity of plant species, including those reported as being endemic. Among the endemic Brazilian plant species, Vellozia gigantea (Velloziaceae) is threatened by extinction and is a promising target to recover endophytic fungi. OBJECTIVE: The present study focused on bioprospecting of bioactive compounds of the endophytic fungi associated with V...
October 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28942758/identification-and-heterologous-expression-of-the-kocurin-biosynthetic-gene-cluster
#19
Luis Linares-Otoya, Virginia Linares-Otoya, Lizbeth Armas-Mantilla, Cyntia Blanco-Olano, Max Crüsemann, Mayar L Ganoza-Yupanqui, Julio Campos-Florian, Gabriele M König, Till F Schäberle
The antibiotically bioactive thiopeptide compound kocurin was identified in extracts from a newly isolated Kocuria rosea strain. The axenic strain was retrieved from a soil sample of the intertidal area at the Paracas National Park, Peru. The genetic basis of this promising natural product with activity against methicillin-resistant Staphylococcus aureus (MRSA) strains was revealed by comparative genome analysis of this new isolate and other reported thiopeptide producer strains. The functionality of the predicted gene locus was experimentally proven by heterologous expression in Streptomyces coelicolor M1146...
September 25, 2017: Microbiology
https://www.readbyqxmd.com/read/28935203/hr-lc-ms-based-analysis-of-two-antibacterial-metabolites-from-a-marine-sponge-symbiont-streptomyces-pharmamarensis-icn40
#20
Francis-Joseph Rosemary Sharmila Joseph, Appadurai Muthamil Iniyan, Samuel Gnana Prakash Vincent
On the effort to screen antibiotics against Methicillin resistant Staphylococcus aureus (MRSA), an actinomycete strain which can produce bactericidal compound was isolated from a marine sponge of Kanyakumari Coast, India. Two anti-MRSA compounds (PVI401 and PVI402) were isolated from the fermentation plates of Streptomyces pharmamarensis ICN40. TLC bioautography analysis yielded two active spots with Rf value of 0.75 (PVI401) and 0.8 (PVI402) from the crude extract. Both the compounds were characterized by HR-LC-MS analysis...
October 2017: Microbial Pathogenesis
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