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  1. Article ; Online: Sepsis among Neonates Admitted to a Neonatal Intensive Care Unit in a Tertiary Care Centre.

    Devkota, Kanchan / Kanodia, Piush / Joshi, Bibek

    JNMA; journal of the Nepal Medical Association

    2024  Volume 62, Issue 270, Page(s) 76–78

    Abstract: Introduction: Neonatal sepsis is a condition that carries a high risk for mortality as neonates rapidly transition to extra-uterine life and are subjected to various risk factors. Sepsis prevalence can be reduced by good antenatal care, early detection ... ...

    Abstract Introduction: Neonatal sepsis is a condition that carries a high risk for mortality as neonates rapidly transition to extra-uterine life and are subjected to various risk factors. Sepsis prevalence can be reduced by good antenatal care, early detection and treatment of risk factors. The study aimed to find out the prevalence of sepsis among neonates admitted to a neonatal intensive care unit in a tertiary care centre.
    Methods: This is a descriptive cross-sectional study conducted among neonates admitted to the neonatal care unit of a tertiary care centre after obtaining ethical approval from the Institutional Review Committee. Data of patients admitted from 12 December 2022 to 30 June 2023 was collected from hospital records. Symptomatic patients admitted to the neonatal intensive care unit were included and those with incomplete data were excluded from the study. A convenience sampling method was used. The point estimate was calculated at a 95% Confidence Interval.
    Results: Among 379 neonates, the prevalence of sepsis was 138 (36.41%) (28.38-44.44, 95% Confidence Interval). A total of 98 (71.01%) had early-onset neonatal sepsis and 40 (28.99%) had late-onset neonatal sepsis.
    Conclusions: The prevalence of neonatal sepsis was found to be lower than other studies done in similar settings.
    Keywords: neonate; neonatal sepsis; prematurity; prevalence.
    MeSH term(s) Pregnancy ; Infant, Newborn ; Humans ; Female ; Neonatal Sepsis/epidemiology ; Neonatal Sepsis/etiology ; Intensive Care Units, Neonatal ; Cross-Sectional Studies ; Tertiary Care Centers ; Sepsis/epidemiology ; Sepsis/complications
    Language English
    Publishing date 2024-02-24
    Publishing country Nepal
    Document type Journal Article
    ZDB-ID 2209910-4
    ISSN 1815-672X ; 0028-2715
    ISSN (online) 1815-672X
    ISSN 0028-2715
    DOI 10.31729/jnma.8431
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A High-Throughput RNA Displacement Assay for Screening SARS-CoV-2 nsp10-nsp16 Complex toward Developing Therapeutics for COVID-19.

    Perveen, Sumera / Khalili Yazdi, Aliakbar / Devkota, Kanchan / Li, Fengling / Ghiabi, Pegah / Hajian, Taraneh / Loppnau, Peter / Bolotokova, Albina / Vedadi, Masoud

    SLAS discovery : advancing life sciences R & D

    2021  Volume 26, Issue 5, Page(s) 620–627

    Abstract: SARS-CoV-2, the coronavirus that causes COVID-19, evades the human immune system by capping its RNA. This process protects the viral RNA and is essential for its replication. Multiple viral proteins are involved in this RNA capping process, including the ...

    Abstract SARS-CoV-2, the coronavirus that causes COVID-19, evades the human immune system by capping its RNA. This process protects the viral RNA and is essential for its replication. Multiple viral proteins are involved in this RNA capping process, including the nonstructural protein 16 (nsp16), which is an
    MeSH term(s) Adenosine/analogs & derivatives ; Adenosine/pharmacology ; Antiviral Agents/pharmacology ; Binding, Competitive ; COVID-19/virology ; Enzyme Inhibitors/pharmacology ; Fluorescence Polarization ; Gene Expression Regulation ; High-Throughput Screening Assays ; Host-Pathogen Interactions/drug effects ; Humans ; Methyltransferases ; Protein Binding ; RNA Caps/antagonists & inhibitors ; RNA Caps/genetics ; RNA Caps/metabolism ; RNA, Viral/antagonists & inhibitors ; RNA, Viral/genetics ; RNA, Viral/metabolism ; SARS-CoV-2/drug effects ; SARS-CoV-2/genetics ; SARS-CoV-2/metabolism ; Signal Transduction ; Small Molecule Libraries/pharmacology ; Viral Nonstructural Proteins/antagonists & inhibitors ; Viral Nonstructural Proteins/genetics ; Viral Nonstructural Proteins/metabolism ; Viral Regulatory and Accessory Proteins/antagonists & inhibitors ; Viral Regulatory and Accessory Proteins/genetics ; Viral Regulatory and Accessory Proteins/metabolism ; Virus Replication ; COVID-19 Drug Treatment
    Chemical Substances Antiviral Agents ; Enzyme Inhibitors ; NSP10 protein, SARS-CoV-2 ; NSP16 protein, SARS-CoV-2 ; RNA Caps ; RNA, Viral ; Small Molecule Libraries ; Viral Nonstructural Proteins ; Viral Regulatory and Accessory Proteins ; Methyltransferases (EC 2.1.1.-) ; Adenosine (K72T3FS567) ; sinefungin (W2U467CIIL)
    Language English
    Publishing date 2021-01-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2885123-7
    ISSN 2472-5560 ; 2472-5552
    ISSN (online) 2472-5560
    ISSN 2472-5552
    DOI 10.1177/2472555220985040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: A High-Throughput Radioactivity-Based Assay for Screening SARS-CoV-2 nsp10-nsp16 Complex.

    Khalili Yazdi, Aliakbar / Li, Fengling / Devkota, Kanchan / Perveen, Sumera / Ghiabi, Pegah / Hajian, Taraneh / Bolotokova, Albina / Vedadi, Masoud

    SLAS discovery : advancing life sciences R & D

    2021  Volume 26, Issue 6, Page(s) 757–765

    Abstract: Frequent outbreaks of novel coronaviruses (CoVs), highlighted by the current severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic, necessitate the development of therapeutics that could be easily and effectively administered worldwide. ... ...

    Abstract Frequent outbreaks of novel coronaviruses (CoVs), highlighted by the current severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic, necessitate the development of therapeutics that could be easily and effectively administered worldwide. The conserved mRNA-capping process enables CoVs to evade their host immune system and is a target for antiviral development. Nonstructural protein (nsp) 16 in complex with nsp10 catalyzes the final step of coronaviral mRNA capping through its 2'-
    MeSH term(s) Adenosine/analogs & derivatives ; Adenosine/chemistry ; Adenosine/pharmacology ; COVID-19/virology ; Cloning, Molecular ; Enzyme Assays ; Enzyme Inhibitors/chemistry ; Enzyme Inhibitors/pharmacology ; Escherichia coli/genetics ; Escherichia coli/metabolism ; Gene Expression ; Genetic Vectors/chemistry ; Genetic Vectors/metabolism ; High-Throughput Screening Assays ; Humans ; Kinetics ; Methylation ; Methyltransferases ; Models, Molecular ; RNA Caps/antagonists & inhibitors ; RNA Caps/genetics ; RNA Caps/metabolism ; RNA, Viral/antagonists & inhibitors ; RNA, Viral/genetics ; RNA, Viral/metabolism ; Recombinant Proteins/chemistry ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; SARS-CoV-2/drug effects ; SARS-CoV-2/enzymology ; SARS-CoV-2/genetics ; Tritium ; Viral Nonstructural Proteins/antagonists & inhibitors ; Viral Nonstructural Proteins/chemistry ; Viral Nonstructural Proteins/genetics ; Viral Nonstructural Proteins/metabolism ; Viral Regulatory and Accessory Proteins/antagonists & inhibitors ; Viral Regulatory and Accessory Proteins/chemistry ; Viral Regulatory and Accessory Proteins/genetics ; Viral Regulatory and Accessory Proteins/metabolism
    Chemical Substances Enzyme Inhibitors ; NSP10 protein, SARS-CoV-2 ; NSP16 protein, SARS-CoV-2 ; RNA Caps ; RNA, Viral ; Recombinant Proteins ; Viral Nonstructural Proteins ; Viral Regulatory and Accessory Proteins ; Tritium (10028-17-8) ; Methyltransferases (EC 2.1.1.-) ; Adenosine (K72T3FS567) ; sinefungin (W2U467CIIL)
    Language English
    Publishing date 2021-04-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2885123-7
    ISSN 2472-5560 ; 2472-5552
    ISSN (online) 2472-5560
    ISSN 2472-5552
    DOI 10.1177/24725552211008863
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Structure-Based Discovery of Inhibitors of the SARS-CoV-2 Nsp14 N7-Methyltransferase.

    Singh, Isha / Li, Fengling / Fink, Elissa A / Chau, Irene / Li, Alice / Rodriguez-Hernández, Annía / Glenn, Isabella / Zapatero-Belinchón, Francisco J / Rodriguez, M Luis / Devkota, Kanchan / Deng, Zhijie / White, Kris / Wan, Xiaobo / Tolmachova, Nataliya A / Moroz, Yurii S / Kaniskan, H Ümit / Ott, Melanie / García-Sastre, Adolfo / Jin, Jian /
    Fujimori, Danica Galonić / Irwin, John J / Vedadi, Masoud / Shoichet, Brian K

    Journal of medicinal chemistry

    2023  Volume 66, Issue 12, Page(s) 7785–7803

    Abstract: An under-explored target for SARS-CoV-2 is ... ...

    Abstract An under-explored target for SARS-CoV-2 is the
    MeSH term(s) Humans ; Methyltransferases ; SARS-CoV-2/genetics ; Viral Nonstructural Proteins/genetics ; COVID-19 ; RNA, Viral/genetics ; Exoribonucleases
    Chemical Substances Methyltransferases (EC 2.1.1.-) ; Viral Nonstructural Proteins ; RNA, Viral ; Exoribonucleases (EC 3.1.-)
    Language English
    Publishing date 2023-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 218133-2
    ISSN 1520-4804 ; 0022-2623
    ISSN (online) 1520-4804
    ISSN 0022-2623
    DOI 10.1021/acs.jmedchem.2c02120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The Structure-Based Design of SARS-CoV-2 nsp14 Methyltransferase Ligands Yields Nanomolar Inhibitors.

    Otava, Tomáš / Šála, Michal / Li, Fengling / Fanfrlík, Jindřich / Devkota, Kanchan / Perveen, Sumera / Chau, Irene / Pakarian, Paknoosh / Hobza, Pavel / Vedadi, Masoud / Boura, Evzen / Nencka, Radim

    ACS infectious diseases

    2021  Volume 7, Issue 8, Page(s) 2214–2220

    Abstract: In this study, we have focused on the structure-based design of the inhibitors of one of the two SARS-CoV-2 methyltransferases (MTases), nsp14. This MTase catalyzes the transfer of the methyl group ... ...

    Abstract In this study, we have focused on the structure-based design of the inhibitors of one of the two SARS-CoV-2 methyltransferases (MTases), nsp14. This MTase catalyzes the transfer of the methyl group from
    MeSH term(s) COVID-19 ; Exoribonucleases ; Humans ; Ligands ; Methyltransferases/genetics ; SARS-CoV-2 ; Viral Nonstructural Proteins
    Chemical Substances Ligands ; Viral Nonstructural Proteins ; Methyltransferases (EC 2.1.1.-) ; Exoribonucleases (EC 3.1.-)
    Language English
    Publishing date 2021-06-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2373-8227
    ISSN (online) 2373-8227
    DOI 10.1021/acsinfecdis.1c00131
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: A high-throughput radioactivity-based assay for screening SARS-CoV-2 nsp10-nsp16 complex

    Khalili Yazdi, Aliakbar / Li, Fengling / Devkota, Kanchan / Perveen, Sumera / Ghiabi, Pegah / Hajian, Taraneh / Bolotokova, Albina / Vedadi, Masoud

    bioRxiv

    Abstract: Frequent outbreaks of novel coronaviruses (CoVs), highlighted by the current SARS-CoV-2 pandemic, necessitate the development of therapeutics that could be easily and effectively administered world-wide. The conserved mRNA-capping process enables CoVs to ...

    Abstract Frequent outbreaks of novel coronaviruses (CoVs), highlighted by the current SARS-CoV-2 pandemic, necessitate the development of therapeutics that could be easily and effectively administered world-wide. The conserved mRNA-capping process enables CoVs to evade their host immune system and is a target for antiviral development. Nonstructural protein (nsp) 16 in complex with nsp10 catalyzes the final step of coronaviral mRNA-capping through its 2′-O-methylation activity. Like other methyltransferases, SARS-CoV-2 nsp10-nsp16 complex is druggable. However, the availability of an optimized assay for high-throughput screening (HTS) is an unmet need. Here, we report the development of a radioactivity-based assay for methyltransferase activity of nsp10-nsp16 complex in a 384-well format, and kinetic characterization, and optimization of the assay for HTS (Z′-factor: 0.83). Considering the high conservation of nsp16 across known CoV species, the potential inhibitors targeting SARS-CoV-2 nsp10-nsp16 complex may also be effective against other emerging pathogenic CoVs.
    Keywords covid19
    Language English
    Publishing date 2021-02-03
    Publisher Cold Spring Harbor Laboratory
    Document type Article ; Online
    DOI 10.1101/2021.02.03.429625
    Database COVID19

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  7. Article ; Online: Peptide Inhibitors of the α-Cobratoxin-Nicotinic Acetylcholine Receptor Interaction.

    Lynagh, Timothy / Kiontke, Stephan / Meyhoff-Madsen, Maria / Gless, Bengt H / Johannesen, Jónas / Kattelmann, Sabrina / Christiansen, Anders / Dufva, Martin / Laustsen, Andreas H / Devkota, Kanchan / Olsen, Christian A / Kümmel, Daniel / Pless, Stephan Alexander / Lohse, Brian

    Journal of medicinal chemistry

    2020  Volume 63, Issue 22, Page(s) 13709–13718

    Abstract: Venomous snakebites cause >100 000 deaths every year, in many cases via potent depression of human neuromuscular signaling by snake α-neurotoxins. Emergency therapy still relies on antibody-based antivenom, hampered by poor access, frequent adverse ... ...

    Abstract Venomous snakebites cause >100 000 deaths every year, in many cases via potent depression of human neuromuscular signaling by snake α-neurotoxins. Emergency therapy still relies on antibody-based antivenom, hampered by poor access, frequent adverse reactions, and cumbersome production/purification. Combining high-throughput discovery and subsequent structure-function characterization, we present simple peptides that bind α-cobratoxin (α-Cbtx) and prevent its inhibition of nicotinic acetylcholine receptors (nAChRs) as a lead for the development of alternative antivenoms. Candidate peptides were identified by phage display and deep sequencing, and hits were characterized by electrophysiological recordings, leading to an 8-mer peptide that prevented α-Cbtx inhibition of nAChRs. We also solved the peptide:α-Cbtx cocrystal structure, revealing that the peptide, although of unique primary sequence, binds to α-Cbtx by mimicking structural features of the nAChR binding pocket. This demonstrates the potential of small peptides to neutralize lethal snake toxins in vitro, establishing a potential route to simple, synthetic, low-cost antivenoms.
    MeSH term(s) Animals ; Binding Sites/drug effects ; Binding Sites/physiology ; Cobra Neurotoxin Proteins/antagonists & inhibitors ; Cobra Neurotoxin Proteins/chemistry ; Cobra Neurotoxin Proteins/metabolism ; Crystallography, X-Ray ; Dose-Response Relationship, Drug ; Female ; Peptide Fragments/chemistry ; Peptide Fragments/metabolism ; Peptide Fragments/pharmacology ; Protein Structure, Secondary ; Receptors, Nicotinic/chemistry ; Receptors, Nicotinic/metabolism ; Xenopus laevis
    Chemical Substances Cobra Neurotoxin Proteins ; Peptide Fragments ; Receptors, Nicotinic ; alpha-cobratoxin (69344-74-7)
    Language English
    Publishing date 2020-11-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218133-2
    ISSN 1520-4804 ; 0022-2623
    ISSN (online) 1520-4804
    ISSN 0022-2623
    DOI 10.1021/acs.jmedchem.0c01202
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: A fluorescence resonance energy transfer-based method for histone methyltransferases

    Devkota, Kanchan / Brian Lohse / Camilla Nyby Jakobsen / Jens Berthelsen / Rasmus Prætorius Clausen

    Analytical biochemistry. 2015 May 01, v. 476

    2015  

    Abstract: A simple dye–quencher fluorescence resonance energy transfer (FRET)-based assay for methyltransferases was developed and used to determine kinetic parameters and inhibitory activity at EHMT1 and EHMT2. Peptides mimicking the truncated histone H3 tail ... ...

    Abstract A simple dye–quencher fluorescence resonance energy transfer (FRET)-based assay for methyltransferases was developed and used to determine kinetic parameters and inhibitory activity at EHMT1 and EHMT2. Peptides mimicking the truncated histone H3 tail were functionalized in each end with a dye and a quencher, respectively. When lysine-9 residues in the peptides were methylated, they were protected from cleavage by endoproteinase–EndoLysC, whereas unmethylated peptides were cleaved, resulting in an increase in fluorescent intensity.
    Keywords energy transfer ; fluorescence ; histones ; methyltransferases ; peptides
    Language English
    Dates of publication 2015-0501
    Size p. 78-80.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1110-1
    ISSN 1096-0309 ; 0003-2697
    ISSN (online) 1096-0309
    ISSN 0003-2697
    DOI 10.1016/j.ab.2015.02.012
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: A fluorescence resonance energy transfer-based method for histone methyltransferases.

    Devkota, Kanchan / Lohse, Brian / Jakobsen, Camilla Nyby / Berthelsen, Jens / Clausen, Rasmus Prætorius

    Analytical biochemistry

    2015  Volume 476, Page(s) 78–80

    Abstract: A simple dye-quencher fluorescence resonance energy transfer (FRET)-based assay for methyltransferases was developed and used to determine kinetic parameters and inhibitory activity at EHMT1 and EHMT2. Peptides mimicking the truncated histone H3 tail ... ...

    Abstract A simple dye-quencher fluorescence resonance energy transfer (FRET)-based assay for methyltransferases was developed and used to determine kinetic parameters and inhibitory activity at EHMT1 and EHMT2. Peptides mimicking the truncated histone H3 tail were functionalized in each end with a dye and a quencher, respectively. When lysine-9 residues in the peptides were methylated, they were protected from cleavage by endoproteinase-EndoLysC, whereas unmethylated peptides were cleaved, resulting in an increase in fluorescent intensity.
    MeSH term(s) Biological Assay/methods ; Fluorescence Resonance Energy Transfer/methods ; Histone-Lysine N-Methyltransferase/chemistry ; Histone-Lysine N-Methyltransferase/metabolism
    Chemical Substances histone methyltransferase (EC 2.1.1.-) ; Histone-Lysine N-Methyltransferase (EC 2.1.1.43)
    Language English
    Publishing date 2015-05-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1110-1
    ISSN 1096-0309 ; 0003-2697
    ISSN (online) 1096-0309
    ISSN 0003-2697
    DOI 10.1016/j.ab.2015.02.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: A high throughput RNA displacement assay for screening SARS-CoV-2 nsp10-nsp16 complex towards developing therapeutics for COVID-19

    Perveen, Sumera / Khalili Yazdi, Aliakbar / Devkota, Kanchan / Li, Fengling / Ghiabi, Pegah / Hajian, Taraneh / Loppnau, Peter / Bolotokova, Albina / Vedadi, Masoud

    bioRxiv

    Abstract: SARS-CoV-2, the coronavirus that causes COVID-19, evades the human immune system by capping its RNA. This process protects the viral RNA and is essential for its replication. Multiple viral proteins are involved in this RNA capping process including the ... ...

    Abstract SARS-CoV-2, the coronavirus that causes COVID-19, evades the human immune system by capping its RNA. This process protects the viral RNA and is essential for its replication. Multiple viral proteins are involved in this RNA capping process including the nonstructural protein 16 (nsp16) which is an S-adenosyl-L-methionine (SAM)-dependent 29-O-methyltransferase. Nsp16 is significantly active when in complex with another nonstructural protein, nsp10, which plays a key role in its stability and activity. Here we report the development of a fluorescence polarization (FP)-based RNA displacement assay for nsp10-nsp16 complex in 384-well format with a Z′-Factor of 0.6, suitable for high throughput screening. In this process, we purified the nsp10-nsp16 complex to higher than 95% purity and confirmed its binding to the methyl donor SAM, product of the reaction, SAH, and a common methyltransferase inhibitor, sinefungin using Isothermal Titration Calorimetry (ITC). The assay was further validated by screening a library of 1124 drug-like compounds. This assay provides a cost-effective high throughput method for screening nsp10-nsp16 complex for RNA-competitive inhibitors towards developing COVID-19 therapeutics.
    Keywords covid19
    Language English
    Publishing date 2020-10-15
    Publisher Cold Spring Harbor Laboratory
    Document type Article ; Online
    DOI 10.1101/2020.10.14.340034
    Database COVID19

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