11 results on '"Mariana González-Medina"'
Search Results
2. Activity Landscape Plotter: A Web-Based Application for the Analysis of Structure-Activity Relationships.
- Author
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Mariana González-Medina, Oscar Méndez-Lucio, and José L. Medina-Franco
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- 2017
- Full Text
- View/download PDF
3. Platform for Unified Molecular Analysis: PUMA.
- Author
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Mariana González-Medina and José L. Medina-Franco
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- 2017
- Full Text
- View/download PDF
4. Consensus Diversity Plots: a global diversity analysis of chemical libraries.
- Author
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Mariana González-Medina, Fernando D. Prieto-Martínez, John R. Owen, and José L. Medina-Franco
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- 2016
- Full Text
- View/download PDF
5. Promiscuity analysis of a kinase panel screen with designated p38 alpha inhibitors
- Author
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Joerg Trappe, Jürgen Bajorath, Filip Miljković, Peter Drueckes, Stefan Laufer, Mariana González-Medina, and Gernot S. Haase
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Pharmacology ,chemistry.chemical_classification ,biology ,Dose-Response Relationship, Drug ,Molecular Structure ,Drug discovery ,Kinase ,p38 mitogen-activated protein kinases ,Organic Chemistry ,Drug Evaluation, Preclinical ,General Medicine ,Computational biology ,Mitogen-Activated Protein Kinase 14 ,Structure-Activity Relationship ,Enzyme ,chemistry ,Mitogen-activated protein kinase ,Drug Design ,Drug Discovery ,biology.protein ,Humans ,Protein phosphorylation ,Kinome ,Binding site ,Protein Kinase Inhibitors - Abstract
Protein phosphorylation by kinases is of critical importance for the regulation of many cellular functions. When kinases are deregulated numerous biological processes are affected, which may cause a variety of diseases. Therefore, kinase inhibition plays an important role for therapeutic intervention. A number of kinase inhibitors have been approved as drugs, initially in oncology where promiscuous (multi-kinase) inhibitors were most efficacious. Exploring kinase inhibitor selectivity and promiscuity for therapy is among the most challenging aspects of kinase drug discovery. Herein, we thoroughly analyze a kinase profiling experiment in which 637 designated inhibitors of p38α MAP kinase (p38α) were tested against a panel of 60 kinases distributed across the human kinome. In this experiment, only 19% of the inhibitors were found to be promiscuous when the median p38α inhibition level was applied as an activity threshold. Promiscuous inhibitors had a median value of two targets per compound, and many of these inhibitors were only active against the p38α and closely related JNK3 enzymes. Promiscuity cliffs were identified and analyzed in a network representation revealing structural modifications that were implicated in triggering compound promiscuity. Taken together, the findings revealed a high degree of selectivity of designated p38α directed inhibitors although they target the ATP binding site that is largely conserved across the human kinome.
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- 2019
6. Chemoselective fluorination and chemoinformatic analysis of griseofulvin: Natural vs fluorinated fungal metabolites
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Austin A. Czarnecki, Joanna E. Burdette, Nicholas H. Oberlies, Cedric J. Pearce, Noemi D. Paguigan, Stephen J. Polyak, Huzefa A. Raja, Mohammed H. Al-Huniti, Mitchell P. Croatt, José L. Medina-Franco, and Mariana González-Medina
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Antifungal ,Antifungal Agents ,Halogenation ,Stereochemistry ,medicine.drug_class ,Clinical Biochemistry ,Antifungal drug ,Pharmaceutical Science ,Antineoplastic Agents ,Microsporum gypseum ,Single step ,Microbial Sensitivity Tests ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Article ,Griseofulvin ,Xylaria cubensis ,Structure-Activity Relationship ,chemistry.chemical_compound ,Drug Discovery ,Tumor Cells, Cultured ,medicine ,Humans ,Microsporum ,Organic chemistry ,Molecular Biology ,Cell Proliferation ,Principal Component Analysis ,Dose-Response Relationship, Drug ,Molecular Structure ,Xylariales ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Chemical space ,0104 chemical sciences ,Molecular Medicine ,Drug Screening Assays, Antitumor ,Selectfluor ,Medical Informatics - Abstract
[2017-2018 UNCG University Libraries Open Access Publishing Fund Grant Winner.] Griseofulvin is a fungal metabolite and antifungal drug used for the treatment of dermatophytosis in both humans and animals. Recently, griseofulvin and its analogues have attracted renewed attention due to reports of their potential anticancer effects. In this study griseofulvin (1) and related analogues (2–6, with 4 being new to literature) were isolated from Xylaria cubensis. Six fluorinated analogues (7–12) were synthesized, each in a single step using the isolated natural products and Selectflour, so as to examine the effects of fluorine incorporation on the bioactivities of this structural class. The isolated and synthesized compounds were screened for activity against a panel of cancer cell lines (MDA-MB-435, MDA-MB-231, OVCAR3, and Huh7.5.1) and for antifungal activity against Microsporum gypseum. A comparison of the chemical space occupied by the natural and fluorinated analogues was carried out by using principal component analysis, documenting that the isolated and fluorinated analogues occupy complementary regions of chemical space. However, the most active compounds, including two fluorinated derivatives, were centered around the chemical space that was occupied by the parent compound, griseofulvin, suggesting that modifications must preserve certain attributes of griseofulvin to conserve its activity.
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- 2017
7. Cheminformatic characterization of natural products from Panama
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Dionisio Olmedo, José L. Medina-Franco, Mahabir P. Gupta, and Mariana González-Medina
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Molecular complexity ,Informatics ,Panama ,Nanotechnology ,Computational biology ,Biology ,01 natural sciences ,Catalysis ,Inorganic Chemistry ,Drug Discovery ,Physical and Theoretical Chemistry ,Molecular Biology ,Biological Products ,Virtual screening ,010405 organic chemistry ,Organic Chemistry ,Biodiversity ,General Medicine ,Plants ,respiratory system ,Global diversity ,chEMBL ,Chemical space ,0104 chemical sciences ,Characterization (materials science) ,010404 medicinal & biomolecular chemistry ,Cheminformatics ,human activities ,Information Systems - Abstract
In this work, we discuss the characterization and diversity analysis of 354 natural products (NPs) from Panama, systematically analyzed for the first time. The in-house database was compared to NPs from Brazil, compounds from Traditional Chinese Medicine, natural and semisynthetic collections used in high-throughput screening, and compounds from ChEMBL. An analysis of the "global diversity" was conducted using molecular properties of pharmaceutical interest, three molecular fingerprints of different design, molecular scaffolds, and molecular complexity. The global diversity was visualized using consensus diversity plots that revealed that the secondary metabolites in the Panamanian flora have a large scaffold diversity as compared to other composite databases and also have several unique scaffolds. The large scaffold diversity is in agreement with the broad range of biological activities that this collection of NPs from Panama has shown. This study also provided further quantitative evidence of the large structural complexity of NPs. The results obtained in this study support that NPs from Panama are promising candidates to identify selective molecules and are suitable sources of compounds for virtual screening campaigns.
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- 2017
8. Open chemoinformatic resources to explore the structure, properties and chemical space of molecules
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Mariana González-Medina, J. Jesús Naveja, Norberto Sánchez-Cruz, and José L. Medina-Franco
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0301 basic medicine ,Web server ,Computer science ,Process (engineering) ,Emerging technologies ,General Chemical Engineering ,General Chemistry ,computer.software_genre ,Data science ,Chemical space ,Field (computer science) ,03 medical and health sciences ,Open data ,030104 developmental biology ,Workflow ,Lead (geology) ,computer - Abstract
New technologies are shaping the way drug discovery data is analyzed and shared. Open data initiatives and web servers are assisting the analysis of the large amounts of data that we are now able to produce. The final goal is to accelerate the process of moving from new data to useful information that could lead to treatments for human diseases. This review discusses open chemoinformatic resources to analyze the diversity and coverage of the chemical space of screening libraries and to explore structure–activity relationships of screening data sets. Free resources to implement workflows and representative web-based applications are emphasized. Future directions in this field are also discussed.
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- 2017
9. Chemoinformatic expedition of the chemical space of fungal products
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J. Jesús Naveja, Tamam El-Elimat, Mario Figueroa, Fernando D. Prieto-Martínez, Nicholas H. Oberlies, José L. Medina-Franco, Cedric J. Pearce, Oscar Méndez-Lucio, and Mariana González-Medina
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0301 basic medicine ,Pharmacology ,Molecular complexity ,010405 organic chemistry ,Drug discovery ,Short Communication ,Computational biology ,Biology ,Molecular Fingerprint ,01 natural sciences ,Combinatorial chemistry ,Chemical space ,0104 chemical sciences ,03 medical and health sciences ,030104 developmental biology ,Cheminformatics ,General screening ,Drug Discovery ,Generally recognized as safe ,Molecular Medicine - Abstract
Aim: Fungi are valuable resources for bioactive secondary metabolites. However, the chemical space of fungal secondary metabolites has been studied only on a limited basis. Herein, we report a comprehensive chemoinformatic analysis of a unique set of 207 fungal metabolites isolated and characterized in a USA National Cancer Institute funded drug discovery project. Results: Comparison of the molecular complexity of the 207 fungal metabolites with approved anticancer and nonanticancer drugs, compounds in clinical studies, general screening compounds and molecules Generally Recognized as Safe revealed that fungal metabolites have high degree of complexity. Molecular fingerprints showed that fungal metabolites are as structurally diverse as other natural products and have, in general, drug-like physicochemical properties. Conclusion: Fungal products represent promising candidates to expand the medicinally relevant chemical space. This work is a significant expansion of an analysis reported years ago for a smaller set of compounds (less than half of the ones included in the present work) from filamentous fungi using different structural properties.
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- 2016
10. Activity Landscape Plotter: A Web-Based Application for the Analysis of Structure-Activity Relationships
- Author
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Oscar Méndez-Lucio, José L. Medina-Franco, and Mariana González-Medina
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0301 basic medicine ,Structure (mathematical logic) ,Service (systems architecture) ,Internet ,Information retrieval ,Informatics ,business.industry ,Computer science ,General Chemical Engineering ,General Chemistry ,Library and Information Sciences ,computer.software_genre ,Computer Science Applications ,Data set ,03 medical and health sciences ,Structure-Activity Relationship ,030104 developmental biology ,Cheminformatics ,Plotter ,Similarity (psychology) ,Web application ,Pairwise comparison ,Data mining ,business ,computer - Abstract
Activity landscape modeling is a powerful method for the quantitative analysis of structure-activity relationships. This cheminformatics area is in continuous growth, and several quantitative and visual approaches are constantly being developed. However, these approaches often fall into disuse due to their limited access. Herein, we present Activity Landscape Plotter as the first freely available web-based tool to automatically analyze structure-activity relationships of compound data sets. Based on the concept of activity landscape modeling, the online service performs pairwise structure and activity relationships from an input data set supplied by the user. For visual analysis, Activity Landscape Plotter generates Structure-Activity Similarity and Dual-Activity Difference maps. The user can interactively navigate through the maps and export all the pairwise structure-activity information as comma delimited files. Activity Landscape Plotter is freely accessible at https://unam-shiny-difacquim.shinyapps.io/ActLSmaps /.
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- 2017
11. Scaffold Diversity of Fungal Metabolites
- Author
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John R. Owen, Mariana González-Medina, Tamam El-Elimat, José L. Medina-Franco, Nicholas H. Oberlies, Mario Figueroa, and Cedric J. Pearce
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0301 basic medicine ,Scaffold ,molecular diversity ,natural products ,media_common.quotation_subject ,Computational biology ,Biology ,Bioinformatics ,01 natural sciences ,03 medical and health sciences ,Pharmacology (medical) ,fungal metabolites ,consensus diversity plots ,media_common ,Original Research ,Pharmacology ,Drug discovery ,cheminformatics ,generative topographic mapping ,respiratory system ,chEMBL ,Global diversity ,Chemical space ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,030104 developmental biology ,Cheminformatics ,chemical space ,Chemical diversity ,human activities ,Diversity (politics) - Abstract
Many drug discovery projects rely on commercial compounds to discover active leads. However, current commercial libraries, with mostly synthetic compounds, access a small fraction of the possible chemical diversity. Natural products, in contrast, possess a vast structural diversity and have proven to be an outstanding source of new drugs. Several chemoinformatic analyses of natural products have demonstrated their diversity and structural complexity. However, to our knowledge, the scaffold content and structural diversity of fungal secondary metabolites have never been studied. Herein, the scaffold diversity of 223 fungal metabolites was measured and compared to the diversity of approved drugs and commercial libraries for HTS containing natural, synthetic, and semi-synthetic compounds. In addition, the global diversity of the fungal isolates was assessed and compared to other reference data sets using Consensus Diversity Plots, a chemoinformatic tool recently developed. It was concluded that fungal secondary metabolites are cyclic systems with few ramifications and more diverse than the commercial libraries with natural products and semi-synthetic compounds. The fungal metabolites data set was one of the most structurally diverse, containing a large proportion of different and unique scaffolds not found in the other compound data sets including ChEMBL. Therefore, fungal metabolites offer a rich source of molecules suited for identifying diverse candidates for drug discovery.
- Published
- 2017
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