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Journal of Molecular Graphics & Modelling

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https://www.readbyqxmd.com/read/27923180/insight-into-the-structure-and-stability-of-tc-and-re-dmsa-complexes-a-computational-study
#1
Daniel Hernández-Valdés, Alejandro Blanco-González, Ariel García-Fleitas, Zalua Rodríguez-Riera, Giuseppe Meola, Roger Alberto, Ulises Jáuregui-Haza
Meso-2,3-dimercaptosuccinic acid (DMSA) is used in nuclear medicine as ligand for preparation of diagnostic and therapy radiopharmaceuticals. DMSA has been the subject of numerous investigations during the past three decades and new and significant information of the chemistry and pharmacology of DMSA complexes have emerged. In comparison to other ligands, the structure of some DMSA complexes is unclear up today. The structures and applications of DMSA complexes are strictly dependent on the chemical conditions of their preparation, especially pH and components ratio...
November 27, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27914299/the-effects-of-fluorine-substitution-on-the-chemical-properties-and-inhibitory-capacity-of-donepezil-anti-alzheimer-drug-density-functional-theory-and-molecular-docking-calculations
#2
Azita Khosravan, Safora Marani, Mohammad Sadegh Sadeghi Googheri
Drug fluorination has the potential to reproduce useful drugs with decreasing the side effect of them. Identifying the effect of this improvement on the chemical properties and biological interactions of drug symbolizes a meaningful progress in drug design. Here the fluorination of Donepezil as an anti-Alzheimer drug, including 7 fluorinated derivatives of it, was investigated computationally. In the first part of our calculations, the most important chemical properties of drug that affects the drug efficiency were investigated by applying the M06/6-31g (d, p) and M062X/6-31g (d, p) levels of theories...
November 25, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27914300/structure-based-analysis-of-bacilli-and-plasmid-dihydrofolate-reductase-evolution
#3
Mona Alotaibi, Ben Delos Reyes, Tin Le, Phuong Luong, Faramarz Valafar, Robert P Metzger, Gary B Fogel, David Hecht
Dihydrofolate reductase (DHFR), a key enzyme in tetrahydrofolate-mediated biosynthetic pathways, has a structural motif known to be highly conserved over a wide range of organisms. Given its critical role in purine and amino acid synthesis, DHFR is a well established therapeutic target for treating a wide range of prokaryotic and eukaryotic infections as well as certain types of cancer. Here we present a structural-based computer analysis of bacterial (Bacilli) and plasmid DHFR evolution. We generated a structure-based sequence alignment using 7 wild-type DHFR x-ray crystal structures obtained from the RCSB Protein Data Bank and 350 chromosomal and plasmid homology models we generated from sequences obtained from the NCBI Protein Database...
November 22, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27923179/structural-dynamics-of-casein-kinase-i-cki-from-malarial-parasite-plasmodium-falciparum-isolate-3d7-insights-from-theoretical-modelling-and-molecular-simulations
#4
Budheswar Dehury, Santosh Kumar Behera, Namita Mahapatra
The protein kinases (PKs), belonging to serine/threonine kinase (STKs), are important drug targets for a wide spectrum of diseases in human. Among protein kinases, the Casein Kinases (CKs) are vastly expanded in various organisms, where, the malarial parasite Plasmodium falciparum possesses a single member i.e., PfCKI, which can phosphorylate various proteins in parasite extracts in vitro condition. But, the structure-function relationship of PfCKI and dynamics of ATP binding is yet to be understood. Henceforth, an attempt was made to study the dynamics, stability, and ATP binding mechanisms of PfCKI through computational modelling, docking, molecular dynamics (MD) simulations, and MM/PBSA binding free energy estimation...
November 21, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27902963/homology-modeling-and-molecular-dynamics-simulation-of-the-hif2%C3%AE-degradation-related-hif2%C3%AE-vhl-complex
#5
Xiaotian Dong, Xiaoru Su, Jiong Yu, Jingqi Liu, Xiaowei Shi, Qiaoling Pan, Jinfeng Yang, Jiajia Chen, Lanjuan Li, Hongcui Cao
BACKGROUND: Hypoxia-inducible factor 2 alpha (HIF2α), prolyl hydroxylase domain protein 2 (PHD2), and the von Hippel Lindau tumor suppressor protein (pVHL) are three principal proteins in the oxygen-sensing pathway. Under normoxic conditions, a conserved proline in HIF2α is hydroxylated by PHD2 in an oxygen-dependent manner, and then pVHL binds and promotes the degradation of HIF2α. However, the crystal structure of the HIF2α-pVHL complex has not yet been established, and this has limited research on the interaction between HIF and pVHL...
November 21, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27880887/de-novo-lead-optimization-of-triazine-derivatives-identifies-potent-antimalarials
#6
Ashutosh Shandilya, Nasimul Hoda, Sameena Khan, Ehtesham Jameel, Jitendra Kumar, B Jayaram
Malaria is a life-threatening disease caused by Plasmodium parasites among which Plasmodium falciparum is the most deadly. Due to the widespread resistance of the current antimalarial drugs, intense research efforts are focused on identification of new and potent antimalarials. We report here, a structure based drug discovery strategy for design of a series of effective and novel triazine based antimalarials. The X-ray structure of P. falciparum methyl transferase (PfPMT) is used as a target as it is unique to the parasite...
November 13, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27894019/elucidating-a-chemical-defense-mechanism-of-antarctic-sponges-a-computational-study
#7
Sai Lakshmana Vankayala, Fiona L Kearns, Bill J Baker, Joseph D Larkin, H Lee Woodcock
In 2000, a novel secondary metabolite (erebusinone, Ereb) was isolated from the Antarctic sea sponge, Isodictya erinacea. The bioactivity of Ereb was investigated, and it was found to inhibit molting when fed to the arthropod species Orchomene plebs. Xanthurenic acid (XA) is a known endogenous molt regulator present in arthropods. Experimental studies have confirmed that XA inhibits molting by binding to either (or both) of two P450 enzymes (CYP315a1 or CYP314a1) that are responsible for the final two hydroxylations in the production of the molt-inducing hormone, 20-hydroxyecdysone (20E)...
November 10, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27863328/comprehensive-comparison-of-twenty-structural-characterization-scales-applied-as-qsam-of-antimicrobial-dodecapeptides-derived-from-bac2a-against-p-aeruginosa
#8
Yu Qian, Ya'nan Liang, Wanqian Liu, Guizhao Liang
Informative numerical characterizations of amino acid residues are essential for quantitative sequence-activity modeling (QSAM). To date, a variety of structural characterization methods based on local amino acids have been proposed. However, limited detailed reports are available using same datasets and modeling methods to compare the ability to characterize structures of amino acids. Here, we evaluate the characterization capability of 20 descriptor sets on a set of antimicrobial peptides (AMPs) derived from Bac2A against P...
November 9, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27855339/effect-of-solvent-model-when-probing-protein-dynamics-with-molecular-dynamics
#9
Samuel Genheden
We probe the dynamics of the Bpti and Galectin-3 proteins using molecular dynamics simulations employing three water models at different levels of resolution, viz. the atomistic TIP4P-Ewald, the coarse-grained Elba and an implicit generalised Born model. The dynamics are quantified indirectly by model-free order parameters, S(2) of the backbone NH and selected side-chain bond vectors, which also have been determined experimentally through NMR relaxation measurements. For the backbone, the order parameters produced with the three solvent models agree to a large extent with experiments, giving average unsigned deviations between 0...
November 9, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27846422/molecular-docking-and-molecular-dynamics-simulation-analyses-of-urea-with-ammoniated-and-ammoxidized-lignin
#10
Wenzhuo Li, Song Zhang, Yingying Zhao, Shuaiyu Huang, Jiangshan Zhao
Ammoniated lignin, prepared through the Mannich reaction of lignin, has more advantages as a slow-release carrier of urea molecules than ammoxidized lignin and lignin. The advantages of the ammoniated lignin include its amine groups added and its high molecular mass kept as similar as that of lignin. Three organic molecules including guaiacyl, 2-hydroxybenzylamine and 5-carbamoylpentanoic acid are monomers respectively in lignin, ammoniated lignin and ammoxidized lignin. We studied the difference between the interactions of lignin, ammoniated lignin and ammoxidized lignin with respect to urea, based on radial distribution functions (RDFs) results from molecular dynamics (MD) simulations...
November 9, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27842227/conf-vlka-a-structure-based-revisitation-of-the-virtual-lock-and-key-approach
#11
Marco Tutone, Ugo Perricone, Anna Maria Almerico
In a previous work, we developed the in house Virtual Lock-and-Key Approach (VLKA) in order to evaluate target assignment starting from molecular descriptors calculated on known inhibitors used as an information source. This protocol was able to predict the correct biological target for the whole dataset with a good degree of reliability (80%), and proved experimentally, which was useful for the target fishing of unknown compounds. In this paper, we tried to remodel the previous in house developed VLKA in a more sophisticated one in order to evaluate the influence of 3D conformation of ligands on the accuracy of the prediction...
November 9, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27846423/in-silico-target-prediction-for-elucidating-the-mode-of-action-of-herbicides-including-prospective-validation
#12
Rucha K Chiddarwar, Sebastian G Rohrer, Antje Wolf, Stefan Tresch, Sabrina Wollenhaupt, Andreas Bender
The rapid emergence of pesticide resistance has given rise to a demand for herbicides with new mode of action (MoA). In the agrochemical sector, with the availability of experimental high throughput screening (HTS) data, it is now possible to utilize in silico target prediction methods in the early discovery phase to suggest the MoA of a compound via data mining of bioactivity data. While having been established in the pharmaceutical context, in the agrochemical area this approach poses rather different challenges, as we have found in this work, partially due to different chemistry, but even more so due to different (usually smaller) amounts of data, and different ways of conducting HTS...
November 6, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27837688/glucose-derivatives-substitution-and-cyclic-peptide-diameter-effects-on-the-stability-of-the-self-assembled-cyclic-peptide-nanotubes-a-joint-qm-md-study
#13
Mohammad Khavani, Mohammad Izadyar, Mohammad Reza Housaindokht
Dynamical behavior and the stability of eighteen nanostructures composed of cyclic peptide (CP) with the general structure of the cyclo(CO(CH2)n=4, 6, 10COCyst), in the gas phase, water and chloroform were investigated during 50ns molecular dynamic (MD) simulations. CP dimers and cyclic peptide nanotubes (CPNTs) are more stable in chloroform than water and this stability is reversely correlated with the ring size of the CP units. Also the effect of glucose derivatives substitution, d-glucose (S1) and N-methyl-d-glucamine (S2), on the stability and other physicochemical properties of the CP dimers and CPNTs were evaluated...
November 5, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27838476/structural-and-water-diffusion-of-poly-acryl-amide-poly-vinyl-alcohol-blend-films-experiment-and-molecular-dynamics-simulations
#14
Yanen Wang, Qinghua Wei, Shuzhi Wang, Weihong Chai, Yingfeng Zhang
To study the effects of composition ratios and temperature on the diffusion of water molecules in PVA/PAM blend films, five simulation models of PVA/PAM with ten water molecules at different composition ratios (4/0, 3/1, 2/2, 1/3, 0/4) were constructed and simulated by using a molecular dynamics (MD) simulation. The diffusion behavior of water molecules in blends were investigated from the aspects of the diffusion coefficient, free volume, pair correlation function (PCF) and trajectories of water molecules, respectively...
November 4, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27835827/a-novel-prediction-approach-for-antimalarial-activities-of-trimethoprim-pyrimethamine-and-cycloguanil-analogues-using-extremely-randomized-trees
#15
Cholwich Nattee, Nirattaya Khamsemanan, Luckhana Lawtrakul, Pisanu Toochinda, Supa Hannongbua
Malaria is still one of the most serious diseases in tropical regions. This is due in part to the high resistance against available drugs for the inhibition of parasites, Plasmodium, the cause of the disease. New potent compounds with high clinical utility are urgently needed. In this work, we created a novel model using a regression tree to study structure-activity relationships and predict the inhibition constant, Ki of three different antimalarial analogues (Trimethoprim, Pyrimethamine, and Cycloguanil) based on their molecular descriptors...
October 26, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27816008/in-silico-investigation-into-the-interactions-between-murine-5-ht3-receptor-and-the-principle-active-compounds-of-ginger-zingiber-officinale
#16
Anna E Lohning, Wolfgang Marx, Liz Isenring
Gingerols and shogaols are the primary non-volatile actives within ginger (Zingiber officinale). These compounds have demonstrated in vitro to exert 5-HT3 receptor antagonism which could benefit chemotherapy-induced nausea and vomiting (CINV). The site and mechanism of action by which these compounds interact with the 5-HT3 receptor is not fully understood although research indicates they may bind to a currently unidentified allosteric binding site. Using in silico techniques, such as molecular docking and GRID analysis, we have characterized the recently available murine 5-HT3 receptor by identifying sites of strong interaction with particular functional groups at both the orthogonal (serotonin) site and a proposed allosteric binding site situated at the interface between the transmembrane region and the extracellular domain...
October 26, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27810777/gpview-a-program-for-wave-function-analysis-and-visualization
#17
Tian Shi, Ping Wang
In this manuscript, we will introduce a recently developed program GPView, which can be used for wave function analysis and visualization. The wave function analysis module can calculate and generate 3D cubes for various types of molecular orbitals and electron density of electronic excited states, such as natural orbitals, natural transition orbitals, natural difference orbitals, hole-particle density, detachment-attachment density and transition density. The visualization module of GPView can display molecular and electronic (iso-surfaces) structures...
October 24, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27825025/modification-of-polychlorinated-phenols-and-evaluation-of-their-toxicity-biodegradation-and-bioconcentration-using-three-dimensional-quantitative-structure-activity-relationship-models
#18
Lidan Tong, Lixin Guo, Xiaojun Lv, Yu Li
Three-dimensional quantitative structure-activity relationship (3D-QSAR) models were established by comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA). Experimental toxicity data in Poecilia reticulata (pLC50) and physico-chemical properties for 12 polychlorinated phenols were used as dependent and as independent variables, respectively. Among the 12 polychlorinated phenols, nine were randomly selected and used as a training set to construct the 3D-QSAR models through the SYBYL-X software to predict the pLC50 values of the remaining 8 polychlorinated phenols congeners, and the other three polychlorinated phenols were used as a test set to evaluate the 3D-QSAR models (the training set and test set were arranged randomly, shuffled 60 times)...
October 21, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27810776/a-dft-study-of-3-2-cycloaddition-reactions-of-an-azomethine-imine-with-n-vinyl-pyrrole-and-n-vinyl-tetrahydroindole
#19
Mar Ríos-Gutiérrez, Fouad Chafaa, Abdelmalek Khorief Nacereddine, Abdelhafid Djerourou, Luis R Domingo
The mechanism and selectivities of the [3+2] cycloaddition (32CA) reactions of azomethine imine (AI) 8 with two N-vinyl five-membered heterocycles (NVFH), 9a and 9b, have been theoretically studied using DFT methods at the MPWB1K/6-31G(d) computational level. The possible ortho/meta regio- and endo/exo stereoselective channels were explored and characterised. The low polar character of these 32CA reactions, which is the consequence of the high nucleophilic character of both reagents, as well as the non-effective reactivity of these NVFH as nucleophiles, accounts for the high calculated activation energies, 16...
October 20, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27771575/ensemble-docking-based-virtual-screening-yields-novel-spirocyclic-jak1-inhibitors
#20
Dávid Bajusz, György G Ferenczy, György M Keserű
Small molecule inhibition of Janus kinases (JAKs) has been demonstrated as a viable strategy for the treatment of various inflammatory conditions and continues to emerge in cancer-related indications. In this study, a large supplier database was screened to identify novel chemistry starting points for JAK1. The docking-based screening was followed up by testing ten hit compounds experimentally, out of which five have displayed single-digit micromolar and submicromolar IC50 values on JAK1. Thus, the study was concluded with the discovery of five novel JAK inhibitors from a tiny screening deck with a remarkable hitrate of 50%...
October 17, 2016: Journal of Molecular Graphics & Modelling
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