LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Zurück zur letzten Suche Suchhistorie
Erweiterte Suche

Ihre letzten Suchen

  1. AU="Rehana Masood"
  2. AU="Sandra Heskamp"
  3. AU="Omid Sadeghi"
  4. AU="Antaya, Richard"
  5. AU="Papadopoulos, G"
  6. AU="Boughen, Santiago"
  7. AU="Brink, P. L."

Suchergebnis

Treffer 1 - 5 von insgesamt 5

Suchoptionen

  1. Artikel ; Online: The Sequence and Three-Dimensional Structure Characterization of Snake Venom Phospholipases B

    Anwar Ullah / Rehana Masood

    Frontiers in Molecular Biosciences, Vol

    2020  Band 7

    Abstract: Snake venom phospholipases B (SVPLBs) are the least studied enzymes. They constitute about 1% of Bothrops crude venoms, however, in other snake venoms, it is present in less than 1%. These enzymes are considered the most potent hemolytic agent in the ... ...

    Abstract Snake venom phospholipases B (SVPLBs) are the least studied enzymes. They constitute about 1% of Bothrops crude venoms, however, in other snake venoms, it is present in less than 1%. These enzymes are considered the most potent hemolytic agent in the venom. Currently, no structural information is available about these enzymes from snake venom. To better understand its three-dimensional structure and mechanisms of envenomation, the current work describes the first model-based structure report of this enzyme from Bothrops moojeni venom named as B. moojeni phospholipase B (PLB_Bm). The structure model of PLB_Bm was generated using model building software like I-TESSER, MODELLER 9v19, and Swiss-Model. The build PLB_Bm model was validated using validation tools (PROCHECK, ERRAT, and Verif3D). The analysis of the PLB_Bm modeled structure indicates that it contains 491 amino acid residues that form a well-defined four-layer αββα sandwich core and has a typical fold of the N-terminal nucleophile aminohydrolase (Ntn-hydrolase). The overall structure of PLB_Bm contains 18 β-strands and 17 α-helices with many connecting loops. The structure divides into two chains (A and B) after maturation. The A chain is smaller and contains 207 amino acid residues, whereas the B chain is larger and contains 266 amino acid residues. The sequence and structural comparison among homologous snake venom, bacterial, and mammals PLBs indicate that differences in the length and sequence composition may confer variable substrate specificity to these enzymes. Moreover, the surface charge distribution, average volume, and depth of the active site cavity also vary in these enzymes. The present work will provide more information about the structure–function relationship and mechanism of action of these enzymes in snakebite envenomation.
    Schlagwörter snake venom phospholipases B ; sequence and three-dimensional structure analysis ; glycosylation ; structural comparison ; structure-based substrate specificity and maturation ; Biology (General) ; QH301-705.5
    Thema/Rubrik (Code) 612
    Sprache Englisch
    Erscheinungsdatum 2020-08-01T00:00:00Z
    Verlag Frontiers Media S.A.
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  2. Artikel ; Online: Elucidating the binding mechanism of SARS-CoV-2 NSP6-TBK1 and structure-based designing of phytocompounds inhibitors for instigating the host immune response

    Muhammad Suleman / Iqra Ishaq / Haji Khan / Safir Ullah khan / Rehana Masood / Norah A. Albekairi / Abdulrahman Alshammari / Sergio Crovella

    Frontiers in Chemistry, Vol

    2024  Band 11

    Abstract: SARS-CoV-2, also referred to as severe acute respiratory syndrome coronavirus 2, is the virus responsible for causing COVID-19, an infectious disease that emerged in Wuhan, China, in December 2019. Among its crucial functions, NSP6 plays a vital role in ... ...

    Abstract SARS-CoV-2, also referred to as severe acute respiratory syndrome coronavirus 2, is the virus responsible for causing COVID-19, an infectious disease that emerged in Wuhan, China, in December 2019. Among its crucial functions, NSP6 plays a vital role in evading the human immune system by directly interacting with a receptor called TANK-binding kinase (TBK1), leading to the suppression of IFNβ production. Consequently, in the present study we used the structural and biophysical approaches to analyze the effect of newly emerged mutations on the binding of NSP6 and TBK1. Among the identified mutations, four (F35G, L37F, L125F, and I162T) were found to significantly destabilize the structure of NSP6. Furthermore, the molecular docking analysis highlighted that the mutant NSP6 displayed its highest binding affinity with TBK1, exhibiting docking scores of −1436.2 for the wildtype and −1723.2, −1788.6, −1510.2, and −1551.7 for the F35G, L37F, L125F, and I162T mutants, respectively. This suggests the potential for an enhanced immune system evasion capability of NSP6. Particularly, the F35G mutation exhibited the strongest binding affinity, supported by a calculated binding free energy of −172.19 kcal/mol. To disrupt the binding between NSP6 and TBK1, we conducted virtual drug screening to develop a novel inhibitor derived from natural products. From this screening, we identified the top 5 hit compounds as the most promising candidates with a docking score of −6.59 kcal/mol, −6.52 kcal/mol, −6.32 kcal/mol, −6.22 kcal/mol, and −6.21 kcal/mol. The molecular dynamic simulation of top 3 hits further verified the dynamic stability of drugs-NSP6 complexes. In conclusion, this study provides valuable insight into the higher infectivity of the SARS-CoV-2 new variants and a strong rationale for the development of novel drugs against NSP6.
    Schlagwörter NSP6 ; TBK1 ; SARS-CoV-2 ; molecular docking ; MD simulation ; Chemistry ; QD1-999
    Thema/Rubrik (Code) 540
    Sprache Englisch
    Erscheinungsdatum 2024-01-01T00:00:00Z
    Verlag Frontiers Media S.A.
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  3. Artikel ; Online: Antioxidant, antibacterial, and catalytic performance of biosynthesized silver nanoparticles of Rhus javanica, Rumex hastatus, and Callistemon viminalis

    Wajheeba Khan / Naeem Khan / Nargis Jamila / Rehana Masood / Aaliya Minhaz / Farhat Amin / Amir Atlas / Umar Nishan

    Saudi Journal of Biological Sciences, Vol 29, Iss 2, Pp 894-

    2022  Band 904

    Abstract: Rhus javanica (Anacardiaceae) containing abundant glucopyranosidal constituents, is traditionally used to treat gastric and duodenal ulcer, dysentery, and diarrhea. Rumex hastatus (Polygonaceae) widely distributed in Pakistan, has traditional importance ... ...

    Abstract Rhus javanica (Anacardiaceae) containing abundant glucopyranosidal constituents, is traditionally used to treat gastric and duodenal ulcer, dysentery, and diarrhea. Rumex hastatus (Polygonaceae) widely distributed in Pakistan, has traditional importance in treating wound healing, jaundice, rheumatism, and skin diseases. Callistemon viminalis (Myrtaceae), a rich source of essential oils, saponins, triterpenoids, phloroglucinols, and flavonoids is used in industries, perfumes, nutrition, and cosmetics. Taking the importance of the subject plants, this study is designed to synthesize silver nanoparticles via aqueous extracts of R. javanica (RJAgNPs), R. hastatus (RHAgNPs), and C. viminalis (CVAgNPs). Synthesis, surface, and sizes of silver nanoparticles (AgNPs) were confirmed using spectroscopic techniques including ultraviolet–visible (UV–Vis), Fourier transform-infrared (FT-IR), and scanning electron microscopy (SEM). AgNPs were produced in ratios 1:15, 1:16, and 1:9 and inferred via appearance of a sharp surface plasmon resonance (SPR) absorption peak (400–435 nm), which represented well-defined, stable, and spherical AgNPs. From SEM analysis, the sizes of RJAgNPs, RHAgNPs, and CVAgNPs were found to be 67 nm, 61 nm, and 55 nm, respectively. The synthesized AgNPs exhibited potential free radical scavenging, antibacterial, and catalytic properties in degradation of dyes including Congo red, methylene blue, methyl orange, rhodamine B, ortho and para-nitrophenols, and several food colours. Hence, the subject AgNPs in the current study might display promising role in drug development and remediation of environmental/industrial effluents.
    Schlagwörter Rhus javanica ; Rumex hastatus ; Callistemon viminalis ; AgNPs ; Antibacterial ; Rhodamine B ; Biology (General) ; QH301-705.5
    Thema/Rubrik (Code) 540
    Sprache Englisch
    Erscheinungsdatum 2022-02-01T00:00:00Z
    Verlag Elsevier
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  4. Artikel ; Online: Quantification of macro, micro and trace elements, and antimicrobial activity of medicinal herbs and their products

    Naeem Khan / Nargis Jamila / Farhat Amin / Rehana Masood / Amir Atlas / Wajheeba Khan / Noor Ul Ain / Sadiq Noor Khan

    Arabian Journal of Chemistry, Vol 14, Iss 4, Pp 103055- (2021)

    2021  

    Abstract: The study describes the content of macro, micro, and trace essential and toxic elements in thirteen medicinal herbs and their products including Acorus calamus, Blepharis edulis, Caesalpinia bonducella, Curculigo orchioides, Helicteres isora, Holarrhena ... ...

    Abstract The study describes the content of macro, micro, and trace essential and toxic elements in thirteen medicinal herbs and their products including Acorus calamus, Blepharis edulis, Caesalpinia bonducella, Curculigo orchioides, Helicteres isora, Holarrhena pubescens, Pastinaca sativa, Pistacia integerrima, Quercus infectoria, Rauwolfia serpentina, Saussurea lappa, Teucrium stocksianum, and Xanthium strumarium available in the local markets of Pakistan. The elemental content were analyzed with the techniques of inductively coupled plasma (ICP) optical emission spectroscopy (OES) and ICP-mass spectrometry (MS). Furthermore, their antibacterial and antifungal activities were evaluated against the selected microbial pathogens including Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis and Escherichia coli, Candida albicans, Candida krusei, Aspergillus flavus, and Trichophyton mentagrophytes. Among macro elements, K and Ca showed the highest content, micro elements were in the order of Rb85/ Sr87 > Zn64/Cu63 > Ni60, and among essential trace elements, the content of Cr52/Cr53 and Co59 were high. The content of the analyzed toxic elements were lower than the permissible standard values. The antimicrobial activities against the subject strains were significant with inhibition zones of 7.0-19.0 mm in disc diffusion procedure, and 62.5–1000 µg/mL in minimum inhibitory concentration method. Hence, the presence of nutritional elements at appreciable concentrations, toxic elements within permissible ranges, and significant antimicrobial potential assume the subject herbs as promising nutritional and therapeutic remedies.
    Schlagwörter Herbs ; Pakistan ; Trace elements ; Inductively coupled plasma-optical emission spectroscopy ; Antimicrobial ; Chemistry ; QD1-999
    Sprache Englisch
    Erscheinungsdatum 2021-04-01T00:00:00Z
    Verlag Elsevier
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  5. Artikel ; Online: Bio-Catalytic Activity of Novel Mentha arvensis Intervened Biocompatible Magnesium Oxide Nanomaterials

    Shah Faisal / Abdullah / Hasnain Jan / Sajjad Ali Shah / Sumaira Shah / Muhammad Rizwan / Nasib Zaman / Zahid Hussain / Muhammad Nazir Uddin / Nadia Bibi / Aishma Khattak / Wajid Khan / Arshad Iqbal / Muhammad Idrees / Rehana Masood

    Catalysts, Vol 11, Iss 780, p

    2021  Band 780

    Abstract: In the present study Mentha arvensis medaited Magnesium oxide nanoparticles were synthesized by novel green route followed by advanced characterization via XRD, FTIR, UV, SEM, TEM, DLS and TGA. The mean grain size of 32.4 nm and crystallite fcc ... ...

    Abstract In the present study Mentha arvensis medaited Magnesium oxide nanoparticles were synthesized by novel green route followed by advanced characterization via XRD, FTIR, UV, SEM, TEM, DLS and TGA. The mean grain size of 32.4 nm and crystallite fcc morphology were confirmed by X-ray diffractive analysis. Scanning and Transmission electron microscopy analysis revealed the spherical and elliptical morphologies of the biosynthesized nanoparticles. Particle surface charge of −16.1 mV were determined by zeta potential and zeta size of 30–120 nm via dynamic light scattering method. Fourier transform spectroscopic analysis revealed the possible involvement of functional groups in the plant extract in reduction of Mg 2+ ions to Mg 0 . Furthermore, the antioxidant, anti-Alzheimer, anti-cancer, and anti- H. pylori activities were performed. The results revealed that MgO-NPs has significant anti- H. pyloric potential by giving ZOI of 17.19 ± 0.83 mm against Helicobacter felis followed by Helicobacter suis . MgO-NPs inhibited protein kinase enzyme up to 12.44 ± 0.72% at 5 mg/mL and thus showed eminent anticancer activity. Significant free radicals scavenging and hemocompatability was also shown by MgO-NPs. MgO-NPs also displayed good inhibition potential against Hela cell lines with maximum inhibition of 49.49 ± 1.18 at 400 µg/mL. Owing to ecofriendly synthesis, non-toxic and biocompatible nature, Mentha arvensis synthesized MgO-NPs can be used as potent antimicrobial agent in therapeutic applications.
    Schlagwörter Mentha arvensis ; green synthesis ; magnesium oxide ; antibacterial ; bio-compatible ; anti-cancer ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Thema/Rubrik (Code) 540
    Sprache Englisch
    Erscheinungsdatum 2021-06-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Zum Seitenanfang