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Journal of Cheminformatics

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https://www.readbyqxmd.com/read/29995272/molecular-generative-model-based-on-conditional-variational-autoencoder-for-de-novo-molecular-design
#1
Jaechang Lim, Seongok Ryu, Jin Woo Kim, Woo Youn Kim
We propose a molecular generative model based on the conditional variational autoencoder for de novo molecular design. It is specialized to control multiple molecular properties simultaneously by imposing them on a latent space. As a proof of concept, we demonstrate that it can be used to generate drug-like molecules with five target properties. We were also able to adjust a single property without changing the others and to manipulate it beyond the range of the dataset.
July 11, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29943160/inferring-potential-small-molecule-mirna-association-based-on-triple-layer-heterogeneous-network
#2
Jia Qu, Xing Chen, Ya-Zhou Sun, Jian-Qiang Li, Zhong Ming
Recently, many biological experiments have indicated that microRNAs (miRNAs) are a newly discovered small molecule (SM) drug targets that play an important role in the development and progression of human complex diseases. More and more computational models have been developed to identify potential associations between SMs and target miRNAs, which would be a great help for disease therapy and clinical applications for known drugs in the field of medical research. In this study, we proposed a computational model of triple layer heterogeneous network based small molecule-MiRNA association prediction (TLHNSMMA) to uncover potential SM-miRNA associations by integrating integrated SM similarity, integrated miRNA similarity, integrated disease similarity, experimentally verified SM-miRNA associations and miRNA-disease associations into a heterogeneous graph...
June 26, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29943074/admetlab-a-platform-for-systematic-admet-evaluation-based-on-a-comprehensively-collected-admet-database
#3
Jie Dong, Ning-Ning Wang, Zhi-Jiang Yao, Lin Zhang, Yan Cheng, Defang Ouyang, Ai-Ping Lu, Dong-Sheng Cao
Current pharmaceutical research and development (R&D) is a high-risk investment which is usually faced with some unexpected even disastrous failures in different stages of drug discovery. One main reason for R&D failures is the efficacy and safety deficiencies which are related largely to absorption, distribution, metabolism and excretion (ADME) properties and various toxicities (T). Therefore, rapid ADMET evaluation is urgently needed to minimize failures in the drug discovery process. Here, we developed a web-based platform called ADMETlab for systematic ADMET evaluation of chemicals based on a comprehensively collected ADMET database consisting of 288,967 entries...
June 26, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29797000/sachem-a-chemical-cartridge-for-high-performance-substructure-search
#4
Miroslav Kratochvíl, Jiří Vondrášek, Jakub Galgonek
BACKGROUND: Structure search is one of the valuable capabilities of small-molecule databases. Fingerprint-based screening methods are usually employed to enhance the search performance by reducing the number of calls to the verification procedure. In substructure search, fingerprints are designed to capture important structural aspects of the molecule to aid the decision about whether the molecule contains a given substructure. Currently available cartridges typically provide acceptable search performance for processing user queries, but do not scale satisfactorily with dataset size...
May 23, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29796778/putting-hands-to-rest-efficient-deep-cnn-rnn-architecture-for-chemical-named-entity-recognition-with-no-hand-crafted-rules
#5
Ilia Korvigo, Maxim Holmatov, Anatolii Zaikovskii, Mikhail Skoblov
Chemical named entity recognition (NER) is an active field of research in biomedical natural language processing. To facilitate the development of new and superior chemical NER systems, BioCreative released the CHEMDNER corpus, an extensive dataset of diverse manually annotated chemical entities. Most of the systems trained on the corpus rely on complicated hand-crafted rules or curated databases for data preprocessing, feature extraction and output post-processing, though modern machine learning algorithms, such as deep neural networks, can automatically design the rules with little to none human intervention...
May 23, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29789977/effect-of-missing-data-on-multitask-prediction-methods
#6
Antonio de la Vega de León, Beining Chen, Valerie J Gillet
There has been a growing interest in multitask prediction in chemoinformatics, helped by the increasing use of deep neural networks in this field. This technique is applied to multitarget data sets, where compounds have been tested against different targets, with the aim of developing models to predict a profile of biological activities for a given compound. However, multitarget data sets tend to be sparse; i.e., not all compound-target combinations have experimental values. There has been little research on the effect of missing data on the performance of multitask methods...
May 22, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29785561/reptb-a-gene-ontology-based-drug-repurposing-approach-for-tuberculosis
#7
Anurag Passi, Neeraj Kumar Rajput, David J Wild, Anshu Bhardwaj
Tuberculosis (TB) is the world's leading infectious killer with 1.8 million deaths in 2015 as reported by WHO. It is therefore imperative that alternate routes of identification of novel anti-TB compounds are explored given the time and costs involved in new drug discovery process. Towards this, we have developed RepTB. This is a unique drug repurposing approach for TB that uses molecular function correlations among known drug-target pairs to predict novel drug-target interactions. In this study, we have created a Gene Ontology based network containing 26,404 edges, 6630 drug and 4083 target nodes...
May 21, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29785513/jdpd-an-open-java-simulation-kernel-for-molecular-fragment-dissipative-particle-dynamics
#8
Karina van den Broek, Hubert Kuhn, Achim Zielesny
Jdpd is an open Java simulation kernel for Molecular Fragment Dissipative Particle Dynamics with parallelizable force calculation, efficient caching options and fast property calculations. It is characterized by an interface and factory-pattern driven design for simple code changes and may help to avoid problems of polyglot programming. Detailed input/output communication, parallelization and process control as well as internal logging capabilities for debugging purposes are supported. The new kernel may be utilized in different simulation environments ranging from flexible scripting solutions up to fully integrated "all-in-one" simulation systems...
May 21, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29777317/using-smiles-strings-for-the-description-of-chemical-connectivity-in-the-crystallography-open-database
#9
Miguel Quirós, Saulius Gražulis, Saulė Girdzijauskaitė, Andrius Merkys, Antanas Vaitkus
Computer descriptions of chemical molecular connectivity are necessary for searching chemical databases and for predicting chemical properties from molecular structure. In this article, the ongoing work to describe the chemical connectivity of entries contained in the Crystallography Open Database (COD) in SMILES format is reported. This collection of SMILES is publicly available for chemical (substructure) search or for any other purpose on an open-access basis, as is the COD itself. The conventions that have been followed for the representation of compounds that do not fit into the valence bond theory are outlined for the most frequently found cases...
May 18, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29740723/international-chemical-identifier-for-reactions-rinchi
#10
Guenter Grethe, Gerd Blanke, Hans Kraut, Jonathan M Goodman
The Reaction InChI (RInChI) extends the idea of the InChI, which provides a unique descriptor of molecular structures, towards reactions. Prototype versions of the RInChI have been available since 2011. The first official release (RInChI-V1.00), funded by the InChI Trust, is now available for download ( http://www.inchi-trust.org/downloads/ ). This release defines the format and generates hashed representations (RInChIKeys) suitable for database and web operations. The RInChI provides a concise description of the key data in chemical processes, and facilitates the manipulation and analysis of reaction data...
May 9, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29651663/finding-the-molecular-scaffold-of-nuclear-receptor-inhibitors-through-high-throughput-screening-based-on-proteochemometric-modelling
#11
Tianyi Qiu, Dingfeng Wu, Jingxuan Qiu, Zhiwei Cao
Nuclear receptors (NR) are a class of proteins that are responsible for sensing steroid and thyroid hormones and certain other molecules. In that case, NR have the ability to regulate the expression of specific genes and associated with various diseases, which make it essential drug targets. Approaches which can predict the inhibition ability of compounds for different NR target should be particularly helpful for drug development. In this study, proteochemometric modelling was introduced to analysis the bioactivity between chemical compounds and NR targets...
April 12, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29633047/krds-a-web-server-for-evaluating-drug-resistance-mutations-in-kinases-by-molecular-docking
#12
Aeri Lee, Seungpyo Hong, Dongsup Kim
Kinases are major targets of anti-cancer therapies owing to their importance in signaling processes that regulate cell growth and proliferation. However, drug resistance has emerged as a major obstacle to cancer therapy. Resistance to drugs has various underlying mechanisms, including the acquisition of mutations at drug binding sites and the resulting reduction in drug binding affinity. Therefore, the identification of mutations that are relevant to drug resistance may be useful to overcome this issue. We hypothesized that these mutations can be identified by combining recent advances in computational methods for protein structure modeling and ligand docking simulation...
April 10, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29623440/finding-the-k-best-synthesis-plans
#13
Rolf Fagerberg, Christoph Flamm, Rojin Kianian, Daniel Merkle, Peter F Stadler
In synthesis planning, the goal is to synthesize a target molecule from available starting materials, possibly optimizing costs such as price or environmental impact of the process. Current algorithmic approaches to synthesis planning are usually based on selecting a bond set and finding a single good plan among those induced by it. We demonstrate that synthesis planning can be phrased as a combinatorial optimization problem on hypergraphs by modeling individual synthesis plans as directed hyperpaths embedded in a hypergraph of reactions (HoR) representing the chemistry of interest...
April 5, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29616425/a-confidence-predictor-for-logd-using-conformal-regression-and-a-support-vector-machine
#14
Maris Lapins, Staffan Arvidsson, Samuel Lampa, Arvid Berg, Wesley Schaal, Jonathan Alvarsson, Ola Spjuth
Lipophilicity is a major determinant of ADMET properties and overall suitability of drug candidates. We have developed large-scale models to predict water-octanol distribution coefficient (logD) for chemical compounds, aiding drug discovery projects. Using ACD/logD data for 1.6 million compounds from the ChEMBL database, models are created and evaluated by a support-vector machine with a linear kernel using conformal prediction methodology, outputting prediction intervals at a specified confidence level. The resulting model shows a predictive ability of [Formula: see text] and with the best performing nonconformity measure having median prediction interval of [Formula: see text] log units at 80% confidence and [Formula: see text] log units at 90% confidence...
April 3, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29616364/the-dye-sensitized-solar-cell-database
#15
Vishwesh Venkatraman, Rajesh Raju, Solon P Oikonomopoulos, Bjørn K Alsberg
BACKGROUND: Dye-sensitized solar cells (DSSCs) have garnered a lot of attention in recent years. The solar energy to power conversion efficiency of a DSSC is influenced by various components of the cell such as the dye, electrolyte, electrodes and additives among others leading to varying experimental configurations. A large number of metal-based and metal-free dye sensitizers have now been reported and tools using such data to indicate new directions for design and development are on the rise...
April 3, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29556758/pybiomed-a-python-library-for-various-molecular-representations-of-chemicals-proteins-and-dnas-and-their-interactions
#16
Jie Dong, Zhi-Jiang Yao, Lin Zhang, Feijun Luo, Qinlu Lin, Ai-Ping Lu, Alex F Chen, Dong-Sheng Cao
BACKGROUND: With the increasing development of biotechnology and informatics technology, publicly available data in chemistry and biology are undergoing explosive growth. Such wealthy information in these data needs to be extracted and transformed to useful knowledge by various data mining methods. Considering the amazing rate at which data are accumulated in chemistry and biology fields, new tools that process and interpret large and complex interaction data are increasingly important...
March 20, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29549526/a-novel-interaction-fingerprint-derived-from-per-atom-score-contributions-exhaustive-evaluation-of-interaction-fingerprint-performance-in-docking-based-virtual-screening
#17
Julia B Jasper, Lina Humbeck, Tobias Brinkjost, Oliver Koch
Protein ligand interaction fingerprints are a powerful approach for the analysis and assessment of docking poses to improve docking performance in virtual screening. In this study, a novel interaction fingerprint approach (PADIF, protein per atom score contributions derived interaction fingerprint) is presented which was specifically designed for utilising the GOLD scoring functions' atom contributions together with a specific scoring scheme. This allows the incorporation of known protein-ligand complex structures for a target-specific scoring...
March 16, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29546548/reply-to-the-comment-made-by-%C3%A5-icho-vor%C3%A5-il%C3%A3-k-and-svozil-on-the-power-metric-a-new-statistically-robust-enrichment-type-metric-for-virtual-screening-applications-with-early-recovery-capability
#18
LETTER
https://www.readbyqxmd.com/read/29546531/comment-on-the-power-metric-a-new-statistically-robust-enrichment-type-metric-for-virtual-screening-applications-with-early-recovery-capability
#19
LETTER
M Šícho, M Voršilák, D Svozil
No abstract text is available yet for this article.
March 15, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29524042/automated-reaction-database-and-reaction-network-analysis-extraction-of-reaction-templates-using-cheminformatics
#20
Pieter P Plehiers, Guy B Marin, Christian V Stevens, Kevin M Van Geem
Both the automated generation of reaction networks and the automated prediction of synthetic trees require, in one way or another, the definition of possible transformations a molecule can undergo. One way of doing this is by using reaction templates. In view of the expanding amount of known reactions, it has become more and more difficult to envision all possible transformations that could occur in a studied system. Nonetheless, most reaction network generation tools rely on user-defined reaction templates...
March 9, 2018: Journal of Cheminformatics
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