434 research outputs found
New bioactive metabolites from Penicillium purpurogenum MM
No full textThree new bioactive compounds, namely (S)-tenellic acid B dimethyl acetal (1a), (3R, 3'R/S)-isotalarone (2), and (3R, 5R)-cis-5-methyl-3-(2-oxobutyl)-dihydrofuran-2-one (3), were isolated from the terrestrial fungus Penicillium purpurogenum MM, together with 15 known metabolites: talaroflavone, pestalasin A, altenuene, penicillide, 3'-O-methyl-dehydroisopenicillide, rubralactone, tenellic acid B, diaporthin, butyrolactone 1, butyrolactone-V, 4-hydroxy-2-methoxyacetanilide, ergosterol, ergosterol peroxide, linoleic acid, and glycerol monolinoleate. The chemical structures of the three new compounds were confirmed by extensive one-and two-dimensional NMR and electron spray ionization high-resolution mass spectra measurements and by comparison with literature data. The absolute configurations of the new compounds, and of talaroflavone (4a) and tenellic acid B (2b), were determined by ab initio calculations of ECD, ORD, and NMR data. The antimicrobial and cytotoxic activities of the crude extract and of the isolated compounds were studied using a set of microorganisms and brine shrimp assay, respectively. The isolation and taxonomic characterization of P. purpurogenum MM is reported
Diverse polyketides and alkaloids from Penicillium sp. KHMM: structural elucidation, biological and molecular docking studies.
No full textHamed A, Ismail M, El-Metwally MM, et al. Diverse polyketides and alkaloids from Penicillium sp. KHMM: structural elucidation, biological and molecular docking studies. Zeitschrift für Naturforschung C. 2019;74(5-6):131-137
Applications of well logging techniques to evaluate the groundwater aquifers in the area between southwest Bani Sweif and west Asyoute governorate, upper Egypt
No full textApplications of well logging techniques to evaluate the groundwateraquifers in the area between southwest Bani Sweif and west Asyoute governorate, upper Egypt Safi Eldein.M. Metwally 1, Shimaa. M. Elska 1, *, Fardous. M. Zarif 1, Abdallah. F. Saad 21 Dept. of geophysical exploration, Desert Research Center, Cairo, Egypt 2Dept of Physics., Faculty of Science, Zagazig University, Zagazig, Egypt *Corresponding author: [email protected] AbstractThe relevance of detecting aquifer characterization and aquifer potential has risen with the application of well logging technique as the demand for water has increased. Apart from pumping data, 16 geophysical well logs (resistivity, gamma ray, self-potential, and nuclear logs) are utilized to achieve the main goal of estimating petrophysical parameters (porosity (∅), effective porosity (∅!""), hydraulic conductivity (k), permeability (K) and shale volume
Bioactive secondary metabolites from Trichoderma viride MM21: structure elucidation, molecular docking and biological activity
No full textAbstract Four bioactive metabolites; ergosterol ( 1 ), peroxy ergosterol ( 2 ), α -cyclopiazonic acid ( 3 ) and kojic acid ( 4 ), were isolated from the fungal sp. Trichoderma viride MM21. Their structures were assigned by cumulative analysis of NMR and mass spectra, and comparison with literature. The antimicrobial activity of the fungus supernatant, mycelial cake, cumulative crude extract and compounds 1–4 was broadly studied against 11 diverse pathogens, revealing auspicious activity results. Based on the molecular docking, ergosterol ( 1 ) and peroxy ergosterol ( 2 ) were picked up to be computationally tested against topoisomerase IV of Staphylococcus aureus. The nominated enzyme is a possible target for the antibacterial activity of triterpenoidal/steroidal compounds. Compounds 1, 2 showed a deep inserting inside the enzyme groove recording a good binding affinity of −8.1 and −8.4 kcal/mol, respectively. Noteworthy that the antibacterial activity of ergosterol was higher (14–17 mm) than peroxy ergosterol (11–14 mm), although ergosterol formed only one hydrogen bond with the target, while peroxy ergosterol formed three hydrogen bonds. Such higher antibacterial activity of ergosterol may be attributed to its interference with other proteins included in this inhibition. The cytotoxic activity was tested against brine shrimp, revealing 100% mortality for the supernatant, crude extract and whole isolated compounds. Such strong cytotoxicity is attributed most likely to the abundant productivity/concentration of α -cyclopiazonic acid and kojic acid
X-ray, structural assignment and molecular docking study of dihydrogeodin from Aspergillus Terreus TM8.
No full textHamed A, Ismail M, El-Metwally MM, et al. X-ray, structural assignment and molecular docking study of dihydrogeodin from Aspergillus Terreus TM8. Natural product research. 2019;33(1):117-121.A re-cultivation of the thermophilic fungus Aspergillus terreus TM8, and working up of its extract afforded the dichloro-benzophenone derivative, dihydrogeodin (1) in addition to the butyrolactones I (2), V (3) and VI (4). A literature surveying revealed one recent structural assignment trial for dihydrogeodin (1), however, with some inaccuracies. We report herein a full assignment of dihydrogeodin (1) using extensive study of 1D, 2D NMR and ESI HR mass data. For the first time as well, we report the planar structure of 1 using X-ray crystallography. Docking and molecular dynamic simulation of dihydrogeodin (1) on the isomerase cyclophilin A has revealed its significant potential activity as an antiviral and immunosuppressive agent
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