1
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Call DH, Adjei JA, Pilgrim R, Jeong JW, Willis EV, Zegarra RA, Tapia NL, Osterhaus M, Vance JA, Voyton CM, Call JA, Pizarro SS, Morris JC, Christensen KA. A multiplexed high throughput screening assay using flow cytometry identifies glycolytic molecular probes in bloodstream form Trypanosoma brucei. Int J Parasitol Drugs Drug Resist 2024; 26:100557. [PMID: 39163740 DOI: 10.1016/j.ijpddr.2024.100557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 07/17/2024] [Accepted: 08/01/2024] [Indexed: 08/22/2024]
Abstract
Kinetoplastid organisms, including Trypanosoma brucei, are a significant health burden in many tropical and semitropical countries. Much of their metabolism is poorly understood. To better study kinetoplastid metabolism, chemical probes that inhibit kinetoplastid enzymes are needed. To discover chemical probes, we have developed a high-throughput flow cytometry screening assay that simultaneously measures multiple glycolysis-relevant metabolites in live T. brucei bloodstream form parasites. We transfected parasites with biosensors that measure glucose, ATP, or glycosomal pH. The glucose and ATP sensors were FRET biosensors, while the pH sensor was a GFP-based biosensor. The pH sensor exhibited a different fluorescent profile from the FRET sensors, allowing us to simultaneously measure pH and either glucose or ATP. Cell viability was measured in tandem with the biosensors using thiazole red. We pooled sensor cell lines, loaded them onto plates containing a compound library, and then analyzed them by flow cytometry. The library was analyzed twice, once with the pooled pH and glucose sensor cell lines and once with the pH and ATP sensor cell lines. Multiplexing sensors provided some internal validation of active compounds and gave potential clues for each compound's target(s). We demonstrated this using the glycolytic inhibitor 2-deoxyglucose and the alternative oxidase inhibitor salicylhydroxamic acid. Individual biosensor-based assays exhibited a Z'-factor value acceptable for high-throughput screening, including when multiplexed. We tested assay performance in a pilot screen of 14,976 compounds from the Life Chemicals Compound Library. We obtained hit rates from 0.2 to 0.4% depending on the biosensor, with many compounds impacting multiple sensors. We rescreened 44 hits, and 28 (64%) showed repeatable activity for one or more sensors. One compound exhibited EC50 values in the low micromolar range against two sensors. We expect this method will enable the discovery of glycolytic chemical probes to improve metabolic studies in kinetoplastid parasites.
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Affiliation(s)
- Daniel H Call
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - John Asafo Adjei
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Ryan Pilgrim
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - James W Jeong
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - E Vance Willis
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Ronald A Zegarra
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Nicholas L Tapia
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Madalyn Osterhaus
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Jacob A Vance
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Charles M Voyton
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA; Department of Genetics and Biochemistry, Clemson University, Clemson, SC, USA.
| | - James A Call
- Chemistry and Biochemistry Department, Brigham Young University, Provo, UT, USA.
| | - Sabrina S Pizarro
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC, USA; Eukaryotic Pathogens Innovation Center, Clemson University, Clemson, SC, USA.
| | - James C Morris
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC, USA; Eukaryotic Pathogens Innovation Center, Clemson University, Clemson, SC, USA.
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2
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Liu J, Mallick S, Xie Y, Grassin C, Lucas B, Schölermann B, Pahl A, Scheel R, Strohmann C, Protzel C, Berg T, Merten C, Ziegler S, Waldmann H. Morphological Profiling Identifies the Motor Protein Eg5 as Cellular Target of Spirooxindoles. Angew Chem Int Ed Engl 2023; 62:e202301955. [PMID: 36929571 DOI: 10.1002/anie.202301955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 03/18/2023]
Abstract
Oxindoles and iso-oxindoles are natural product-derived scaffolds that provide inspiration for the design and synthesis of novel biologically relevant compound classes. Notably, the spirocyclic connection of oxindoles with iso-oxindoles has not been explored by nature but promises to provide structurally related compounds endowed with novel bioactivity. Therefore, methods for their efficient synthesis and the conclusive discovery of their cellular targets are highly desirable. We describe a selective RhIII -catalyzed scaffold-divergent synthesis of spirooxindole-isooxindoles and spirooxindole-oxindoles from differently protected diazooxindoles and N-pivaloyloxy aryl amides which includes a functional group-controlled Lossen rearrangement as key step. Unbiased morphological profiling of a corresponding compound collection in the Cell Painting assay efficiently identified the mitotic kinesin Eg5 as the cellular target of the spirooxindoles, defining a unique Eg5 inhibitor chemotype.
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Affiliation(s)
- Jie Liu
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Shubhadip Mallick
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Yusheng Xie
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Corentin Grassin
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Organic Chemistry II, University-Street 150, 44801, Bochum, Germany
| | - Belén Lucas
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Beate Schölermann
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Axel Pahl
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
- Compound Management and Screening Center, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Rebecca Scheel
- Technical University Dortmund, Faculty of Chemistry, Inorganic Chemistry, Otto-Hahn-Street 6, 44221, Dortmund, Germany
| | - Carsten Strohmann
- Technical University Dortmund, Faculty of Chemistry, Inorganic Chemistry, Otto-Hahn-Street 6, 44221, Dortmund, Germany
| | - Christoph Protzel
- Leipzig University, Institute of Organic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Thorsten Berg
- Leipzig University, Institute of Organic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Christian Merten
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Organic Chemistry II, University-Street 150, 44801, Bochum, Germany
| | - Slava Ziegler
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
| | - Herbert Waldmann
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Street 11, 44227, Dortmund, Germany
- Technical University Dortmund, Faculty of Chemistry, Chemical Biology, Otto-Hahn-Street 6, 44221, Dortmund, Germany
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3
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Gaikwad SY, Phatak P, Mukherjee A. Cutting edge strategies for screening of novel anti-HIV drug candidates against HIV infection: A concise overview of cell based assays. Heliyon 2023; 9:e16027. [PMID: 37215829 PMCID: PMC10195898 DOI: 10.1016/j.heliyon.2023.e16027] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 04/11/2023] [Accepted: 05/02/2023] [Indexed: 05/24/2023] Open
Abstract
The advent of Highly Active Antiretroviral Therapy has majorly contributed towards reducing the morbidity and mortality associated with HIV infected people, thus improving the quality of their life. Still, the eradication of HIV infection has not been achieved due to some important limitations such as non-adherence to therapy, cellular toxicity, restricted bioavailability of antiretroviral drugs and emergence of drug resistant viruses. Moreover, persistence of latent HIV-reservoirs even under antiviral-drug pressure is the major obstacle in HIV cure. Currently used antiretrovirals can suppress the viral replication in activated CD4+ cells, however, it has been observed that the available antiretroviral therapy appears inadequate to reduce latent reservoirs established in resting memory CD4+ T cells. Therefore, for eradication or reduction of latent reservoirs many immunotherapeutic and pharmacologic approaches including latency reversing agents are being studied constantly. Additionally, promising therapeutic strategies including discovery of novel drugs and drug targets are continuously being explored. Therefore, preclinical testing has become an important step of drug development process, continuously demanding innovative, but less time consuming evaluation strategies. Present review attempts to gather and line-up the information on existing cell-based methodologies applied for assessing drug candidates for their antiretroviral potential. Further, we intend to outline the advanced and reliable cell based methodologies that would expedite the process of discovery and development of antiretrovirals.
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Affiliation(s)
| | | | - Anupam Mukherjee
- Corresponding author. Division of Virology, ICMR-National AIDS Research Institute, Plot No. 73, 'G' Block, MIDC, Bhosari, Pune, 411026, Maharashtra, India.
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4
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Keles H, Schofield CA, Rannikmae H, Edwards EE, Mohamet L. A Scalable 3D High-Content Imaging Protocol for Measuring a Drug Induced DNA Damage Response Using Immunofluorescent Subnuclear γH2AX Spots in Patient Derived Ovarian Cancer Organoids. ACS Pharmacol Transl Sci 2022; 6:12-21. [PMID: 36654745 PMCID: PMC9841773 DOI: 10.1021/acsptsci.2c00200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Indexed: 12/14/2022]
Abstract
The high morbidity rate of ovarian cancer has remained unchanged during the past four decades, partly due to a lack of understanding of disease mechanisms and difficulties in developing new targeted therapies. Defective DNA damage detection and repair is one of the hallmarks of cancer cells and is a defining characteristic of ovarian cancer. Most in vitro studies to date involve viability measurements at scale using relevant cancer cell lines; however, the translation to the clinic is often lacking. The use of patient derived organoids is closing that translational gap, yet the 3D nature of organoid cultures presents challenges for assay measurements beyond viability measurements. In particular, high-content imaging has the potential for screening at scale, providing a better understanding of the mechanism of action of drugs or genetic perturbagens. In this study we report a semiautomated and scalable immunofluorescence imaging assay utilizing the development of a 384-well plate based subnuclear staining and clearing protocol and optimization of 3D confocal image analysis for studying DNA damage dose response in human ovarian cancer organoids. The assay was validated in four organoid models and demonstrated a predictable response to etoposide drug treatment with the lowest efficacy observed in the clinically most resistant model. This imaging and analysis method can be applied to other 3D organoid and spheroid models for use in high content screening.
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Affiliation(s)
- Hakan Keles
- Genome
Biology, Genomic Sciences, R&D, GSK, Gunnels Wood Road, Stevenage, SG1 2NY, United Kingdom,E-mail: ,
| | - Christopher A. Schofield
- Genome
Biology, Genomic Sciences, R&D, GSK, Gunnels Wood Road, Stevenage, SG1 2NY, United Kingdom
| | - Helena Rannikmae
- Complex
In Vitro Models, In Vitro In Vivo Translation, R&D, GSK, Gunnels Wood Road, Stevenage, SG1 2NY, United Kingdom
| | - Erin Elizabeth Edwards
- Genome
Biology, Genomic Sciences, R&D, GSK, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Lisa Mohamet
- Genome
Biology, Genomic Sciences, R&D, GSK, Gunnels Wood Road, Stevenage, SG1 2NY, United Kingdom
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5
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Lee NA, Shen SC, Buehler MJ. An automated biomateriomics platform for sustainable programmable materials discovery. MATTER 2022; 5:3597-3613. [PMID: 36817352 PMCID: PMC9937510 DOI: 10.1016/j.matt.2022.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Recently, the potential to create functional materials from various forms of organic matter has received increased interest due to its potential to address environmental concerns. However, the process of creating novel materials from biomass requires extensive experimentation. A promising means of predicting the properties of such materials would be the use of machine-learning models trained on or integrated into self-learned experimental data and methods. We outline an automated system for the discovery and characterization of novel, sustainable, and functional materials from input biomass. Artificial intelligence provides the capacity to examine experimental data, draw connections between composite composition and behavior, and design future experiments to expand the system's understanding of the studied materials. Extensions to the system are described that could further accelerate the discovery of sustainable composites, including the use of interpretable machine-learning methods to expand the insights gleaned from to human-readable materiomic insights about material process-structure-functional relationships.
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Affiliation(s)
- Nicolas A. Lee
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Massachusetts Institute of Technology, 77 Massachusetts Avenue 1-165, Cambridge, MA 02139, USA
- School of Architecture and Planning, Media Lab, Massachusetts Institute of Technology, 75 Amherst Street, Cambridge, MA 02139, USA
| | - Sabrina C. Shen
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Massachusetts Institute of Technology, 77 Massachusetts Avenue 1-165, Cambridge, MA 02139, USA
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Markus J. Buehler
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Massachusetts Institute of Technology, 77 Massachusetts Avenue 1-165, Cambridge, MA 02139, USA
- Center for Computational Science and Engineering, Schwarzman College of Computing, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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6
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Badr-Eldin SM, Aldawsari HM, Kotta S, Deb PK, Venugopala KN. Three-Dimensional In Vitro Cell Culture Models for Efficient Drug Discovery: Progress So Far and Future Prospects. Pharmaceuticals (Basel) 2022; 15:926. [PMID: 36015074 PMCID: PMC9412659 DOI: 10.3390/ph15080926] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/16/2022] [Accepted: 07/18/2022] [Indexed: 12/13/2022] Open
Abstract
Despite tremendous advancements in technologies and resources, drug discovery still remains a tedious and expensive process. Though most cells are cultured using 2D monolayer cultures, due to lack of specificity, biochemical incompatibility, and cell-to-cell/matrix communications, they often lag behind in the race of modern drug discovery. There exists compelling evidence that 3D cell culture models are quite promising and advantageous in mimicking in vivo conditions. It is anticipated that these 3D cell culture methods will bridge the translation of data from 2D cell culture to animal models. Although 3D technologies have been adopted widely these days, they still have certain challenges associated with them, such as the maintenance of a micro-tissue environment similar to in vivo models and a lack of reproducibility. However, newer 3D cell culture models are able to bypass these issues to a maximum extent. This review summarizes the basic principles of 3D cell culture approaches and emphasizes different 3D techniques such as hydrogels, spheroids, microfluidic devices, organoids, and 3D bioprinting methods. Besides the progress made so far in 3D cell culture systems, the article emphasizes the various challenges associated with these models and their potential role in drug repositioning, including perspectives from the COVID-19 pandemic.
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Affiliation(s)
- Shaimaa M. Badr-Eldin
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hibah M. Aldawsari
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Sabna Kotta
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Pran Kishore Deb
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Philadelphia University, P.O. Box 1, Amman 19392, Jordan
| | - Katharigatta N. Venugopala
- Department of Pharmaceutical Sciences, College of Clinical Pharmacy, King Faisal University, Al-Ahsa 31982, Saudi Arabia;
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, Durban 4001, South Africa
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7
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Wang J, Jin Y, Li M, Liu S, Lo KKW, Zhao Q. Time-Resolved Luminescent Sensing and Imaging for Enzyme Catalytic Activity Based on Responsive Probes. Chem Asian J 2022; 17:e202200429. [PMID: 35819359 DOI: 10.1002/asia.202200429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 07/11/2022] [Indexed: 11/07/2022]
Abstract
Enzymes, as a kind of biomacromolecules, play an important role in many physiological processes and relate directly to various diseases. Developing an efficient detection method for enzyme activity is important to achieve early diagnosis of enzyme-relevant diseases and high throughput screening of potential enzyme-relevant drugs. Time-resolved luminescence assay provide a high accuracy and signal-to-noise ratios detection methods for enzyme activity, which has been widely used in high throughput screening of enzyme-relevant drugs and diagnosis of enzyme-relevant diseases. Inspired by these advantages, various responsive probes based on metal complexes and metal-free organic compounds have been developed for time-resolved bioimaging and biosensing of enzyme activity owing to their long luminescence lifetimes, high quantum yields and photostability. In this review, we comprehensively reviewed metal complex- and metal-free organic compound-based responsive probes applied to detect enzyme activity through time-resolved imaging, including their design strategies and sensing principles. Current challenges and future prospects in this rapidly growing field are also discussed.
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Affiliation(s)
- Jiawei Wang
- Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, 9 Wenyuan Road, 210023, Nanjing, CHINA
| | - Yibiao Jin
- Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, 9 Wenyuan Road, 210023, Nanjing, CHINA
| | - Mingdang Li
- Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, 9 Wenyuan Road, 210023, Nanjing, CHINA
| | - Shujuan Liu
- Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, 9 Wenyuan Road, 210023, Nanjing, CHINA
| | - Kenneth Kam-Wing Lo
- City University of Hong Kong, Department of Chemistry, Tat Chee Avenue, Hong Kong, CHINA
| | - Qiang Zhao
- Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, 210023, Nanjing, CHINA
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8
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Deng Y, Lin Z, Cheng Y. Coding recognition of the dose-effect interdependence of small biomolecules encrypted on paired chromatographic-based microassay arrays. Anal Bioanal Chem 2022; 414:5991-6001. [PMID: 35680658 PMCID: PMC9183755 DOI: 10.1007/s00216-022-04162-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/26/2022] [Accepted: 05/31/2022] [Indexed: 11/29/2022]
Abstract
The discovery of small biomolecules has suffered from the lack of a comprehensive framework to express the intrinsic correlation between bioactivity and the contribution from small molecules in complex samples with molecular and bioactivity diversity. Here, by mapping a sample’s 2D-HPTLC fingerprint to microplates, paired chromatographic-based microassay arrays are created, which can be used as quasi-chips to characterize multiple attributes of chromatographic components; as the array differential expression of the bioactivity and molecular attributes of irregular chromatographic spots for dose–effect interdependent encoding; and also as the automatic-collimated array mosaics of the multi-attributes of each component itself encrypted by its chromatographic fingerprint. Based on this homologous framework, we propose a correlating recognition strategy for small biomolecules through their self-consistent chromatographic behavior characteristics. In the approach, the small biomolecule recognition in diverse compounds is transformed into a constraint satisfaction problem, which is addressed through examining the dose–effect interdependence of the homologous 2D code pairs by an array matching algorithm, instead of preparing diverse compound monomers of complex test samples for identification item-by-item. Furthermore, considering the dose–effect interdependent 2D code pairs as links and the digital-specific quasimolecular ions as nodes, an extendable self-consistent framework that correlates mammalian cell phenotypic and target-based bioassays with small biomolecules is established. Therefore, the small molecule contributions and the correlations of bioactivities, as well as their pathways, can be comprehensively revealed, so as to improve the reliability and efficiency of screening. This strategy was successfully applied to galangal, and demonstrated the high-throughput digital preliminary screening of small biomolecules in a natural product.
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Affiliation(s)
- Yifeng Deng
- Guangdong Key Laboratory for Research & Development of Natural Drugs, Guangdong Medical University, Zhanjiang, 524023, China.
| | - Zhenpeng Lin
- Guangdong Key Laboratory for Research & Development of Natural Drugs, Guangdong Medical University, Zhanjiang, 524023, China
| | - Yuan Cheng
- Guangdong Key Laboratory for Research & Development of Natural Drugs, Guangdong Medical University, Zhanjiang, 524023, China
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9
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Katsuki R, Numayama T, Tabuchi Y, Sharma J, Satake N, Sandhu A, Taki M. Solvatochromic peptidic binder obtained via extended phage display acts as a fluororeporter for fragment-based drug discovery (FBDD). Anal Bioanal Chem 2022; 414:4803-4807. [DOI: 10.1007/s00216-022-04128-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 05/09/2022] [Accepted: 05/11/2022] [Indexed: 11/29/2022]
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10
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Sato Y, Miura H, Tanabe T, Okeke CU, Kikuchi A, Nishizawa S. Fluorescence Sensing of the Panhandle Structure of the Influenza A Virus RNA Promoter by Thiazole Orange Base Surrogate-Carrying Peptide Nucleic Acid Conjugated with Small Molecule. Anal Chem 2022; 94:7814-7822. [PMID: 35604144 DOI: 10.1021/acs.analchem.1c05488] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have developed a new class of triplex-forming peptide nucleic acid (PNA)-based fluorogenic probes for sensing of the panhandle structure of the influenza A virus (IAV) RNA promoter region. Here, a small molecule (DPQ) capable of selectively binding to the internal loop structure was conjugated with triplex-forming forced intercalation of the thiazole orange (tFIT) probe with natural PNA nucleobases. The resulting conjugate, tFIT-DPQ, showed a significant light-up response (83-fold) upon strong (Kd = 107 nM) and structure-selective binding to the IAV RNA promoter region under physiological conditions (pH 7.0, 100 mM NaCl). We demonstrated the conjugation of these two units through the suitable spacer was key to show useful binding and fluorogenic signaling functions. tFIT-DPQ facilitated the sensitive and selective detection of IAV RNA based on its binding to the promoter region. Furthermore, we found that tFIT-DPQ could work as a sensitive indicator for screening of test compounds targeting the IAV RNA promoter region in the fluorescence indicator displacement assay.
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Affiliation(s)
- Yusuke Sato
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Hiromasa Miura
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Takaaki Tanabe
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Chioma Uche Okeke
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Akiko Kikuchi
- Department of Kampo and Integrative Medicine, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Seiichi Nishizawa
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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11
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Urocortin-1 Is Chondroprotective in Response to Acute Cartilage Injury via Modulation of Piezo1. Int J Mol Sci 2022; 23:ijms23095119. [PMID: 35563508 PMCID: PMC9105101 DOI: 10.3390/ijms23095119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/27/2022] [Accepted: 04/30/2022] [Indexed: 02/01/2023] Open
Abstract
Post-traumatic OA (PTOA) is often triggered by injurious, high-impact loading events which result in rapid, excessive chondrocyte cell death and a phenotypic shift in residual cells toward a more catabolic state. As such, the identification of a disease-modifying OA drug (DMOAD) that can protect chondrocytes from death following impact injury, and thereby prevent cartilage degradation and progression to PTOA, would offer a novel intervention. We have previously shown that urocortin-1 (Ucn) is an essential endogenous pro-survival factor that protects chondrocytes from OA-associated pro-apoptotic stimuli. Here, using a drop tower PTOA-induction model, we demonstrate the extent of Ucn's chondroprotective role in cartilage explants exposed to excessive impact load. Using pathway-specific agonists and antagonists, we show that Ucn acts to block load-induced intracellular calcium accumulation through blockade of the non-selective cation channel Piezo1 rather than TRPV4. This protective effect is mediated primarily through the Ucn receptor CRF-R1 rather than CRF-R2. Crucially, we demonstrate that the chondroprotective effect of Ucn is maintained whether it is applied pre-impact or post-impact, highlighting the potential of Ucn as a novel DMOAD for the prevention of injurious impact overload-induced PTOA.
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12
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Rathore RS, R Ayyannan S, Mahto SK. Emerging three-dimensional neuronal culture assays for neurotherapeutics drug discovery. Expert Opin Drug Discov 2022; 17:619-628. [DOI: 10.1080/17460441.2022.2061458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Rahul S Rathore
- Pharmaceutical Chemistry Research Laboratory II, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, UP, India
| | - Senthil R Ayyannan
- Pharmaceutical Chemistry Research Laboratory II, Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, UP, India
| | - Sanjeev K Mahto
- Tissue Engineering and Biomicrofluidics Laboratory, School of Biomedical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, UP, India
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13
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Recent Advances in Divergent Synthetic Strategies for Indole-Based Natural Product Libraries. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072171. [PMID: 35408569 PMCID: PMC9000743 DOI: 10.3390/molecules27072171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 03/24/2022] [Accepted: 03/25/2022] [Indexed: 01/26/2023]
Abstract
Considering the potential bioactivities of natural product and natural product-like compounds with highly complex and diverse structures, the screening of collections and small-molecule libraries for high-throughput screening (HTS) and high-content screening (HCS) has emerged as a powerful tool in the development of novel therapeutic agents. Herein, we review the recent advances in divergent synthetic approaches such as complexity-to-diversity (Ctd) and biomimetic strategies for the generation of structurally complex and diverse indole-based natural product and natural product-like small-molecule libraries.
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14
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Jiang B, Wu RM, Li HD, Li K, Li H, Dang WZ, Feng GZ, Bao WL, Ye G, Shen XY. Yixin Ningshen Tablet Alleviates Comorbidity of Myocardial Infarction and Depression by Enhancing Myocardial Energy Metabolism and Increasing Availability of Monoamine Neurotransmitter. Chin J Integr Med 2022; 28:586-593. [PMID: 35319073 DOI: 10.1007/s11655-022-3570-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To investigate the therapeutic effect of Yixin Ningshen Tablet (YXNS) on comorbidity of myocardial infarction (MI) and depression in rats and explore the underlying mechanism. METHODS The Sprague-Dawley rats were randomly divided into 5 groups with 7 rats in each group according to their weights, including control, model, fluoxetine (FLXT, 10 mg/kg), low-dose YXNS (LYXNS, 100 mg/kg), and high-dose YXNS (HYXNS, 300 mg/kg) groups. All rats were pretreated with corresponding drugs for 12 weeks. The rat model of MI and depression was constructed by ligation of left anterior descending coronary artery and chronic mild stress stimulation. The echocardiography, sucrose preference test, open field test, and forced swim test were performed. Myocardial infarction (MI) area and myocardial apoptosis was also detected. Serum levels of interleukin (IL)-6, IL-1β, tumor necrosis factor-α (TNF-α), 5-hydroxytryptamine (5-HT), adrenocorticotrophic hormone (ACTH), corticosterone (CORT), and norepinephrine (NE) were determined by enzyme linked immunosorbent assay. The proteins of adenosine 5'-monophosphate -activated protein kinase (AMPK), p-AMPK, peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α), and nuclear respiratory factor 1 (NRF1) in heart were detected by Western blot analysis. The expression levels of TNF-α, IL-6, indoleamine 2,3-dioxygenase (IDO1), kynurenine 3-monooxygenase (KMO), and kynureninase (KYNU) in hippocampus were detected by real-time quantitative polymerase chain reaction. RESULTS Compared with the model group, the cardiac function of rats treated with YXNS improved significantly (P<0.01). Meanwhile, YXNS effectively reduced MI size and cardiomyocytes apoptosis of rats (P<0.01 or P<0.05), promoted AMPK phosphorylation, and increased PGC-1α protein expression (P<0.01 or P<0.05). HYXNS significantly increased locomotor activity of rats, decreased the levels of TNF-α, IL-6 and IL-1β, and increased the serum levels of 5-HT, NE, ACTH, and CORT (all P<0.05). Moreover, HYXNS decreased the mRNA expressions of IDO1, KMO and KYNU (P<0.05). CONCLUSIONS YXNS can relieve MI by enhancing myocardial energy metabolism. Meanwhile, YXNS can alleviate depression by resisting inflammation and increasing availability of monoamine neurotransmitters. It may be used as a potential drug to treat comorbidity of MI and depression.
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Affiliation(s)
- Bing Jiang
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China.,Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Ruo-Ming Wu
- Central Research Institute, Shanghai Pharmaceuticals Holding Co., Ltd., Shanghai, 200120, China
| | - Hai-Dong Li
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China
| | - Kun Li
- Central Research Institute, Shanghai Pharmaceuticals Holding Co., Ltd., Shanghai, 200120, China
| | - Hui Li
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China
| | - Wen-Zhen Dang
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China
| | - Gui-Ze Feng
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China
| | - Wei-Lian Bao
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China
| | - Guan Ye
- Central Research Institute, Shanghai Pharmaceuticals Holding Co., Ltd., Shanghai, 200120, China
| | - Xiao-Yan Shen
- Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, 200120, China.
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15
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Shah V, Shah J. Restoring Ravaged Heart: Molecular Mechanisms and Clinical Application of miRNA in Heart Regeneration. Front Cardiovasc Med 2022; 9:835138. [PMID: 35224063 PMCID: PMC8866653 DOI: 10.3389/fcvm.2022.835138] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 01/17/2022] [Indexed: 11/28/2022] Open
Abstract
Human heart development is a complex and tightly regulated process, conserving proliferation, and multipotency of embryonic cardiovascular progenitors. At terminal stage, progenitor cell type gets suppressed for terminal differentiation and maturation. In the human heart, most cardiomyocytes are terminally differentiated and so have limited proliferation capacity. MicroRNAs (miRNAs) are non-coding single-stranded RNA that regulate gene expression and mRNA silencing at the post-transcriptional level. These miRNAs play a crucial role in numerous biological events, including cardiac development, and cardiomyocyte proliferation. Several cardiac cells specific miRNAs have been discovered. Inhibition or overexpression of these miRNAs could induce cardiac regeneration, cardiac stem cell proliferation and cardiomyocyte proliferation. Clinical application of miRNAs extends to heart failure, wherein the cell cycle arrest of terminally differentiated cardiac cells inhibits the heart regeneration. The regenerative capacity of the myocardium can be enhanced by cardiomyocyte specific miRNAs controlling the cell cycle. In this review, we focus on cardiac-specific miRNAs involved in cardiac regeneration and cardiomyocyte proliferation, and their potential as a new clinical therapy for heart regeneration.
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16
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Inter-platform assessment of performance of high-throughput desorption electrospray ionization mass spectrometry. TALANTA OPEN 2021. [DOI: 10.1016/j.talo.2021.100046] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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17
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Tang C, Niu Q, Cicka D, Du Y, Mo X, Fu H. A time-resolved fluorescence resonance energy transfer screening assay for discovery of protein-protein interaction modulators. STAR Protoc 2021; 2:100804. [PMID: 34527960 PMCID: PMC8433285 DOI: 10.1016/j.xpro.2021.100804] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Protein-protein interactions (PPIs) have emerged as promising yet challenging therapeutic targets. A robust bioassay is required for rapid PPI modulator discovery. Here, we present a time-resolved Förster's (fluorescence) resonance energy transfer assay protocol for PPI modulator screening in a 1536-well plate format. We use hypomorph SMAD4R361H-SMAD3 PPI as an example to illustrate the application of the protocol for screening of variant-directed PPI inducers. This platform can be readily adapted for the discovery of both small-molecule PPI inducers and inhibitors. For complete details on the use and execution of this protocol, please refer to Tang et al. (2020).
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Affiliation(s)
- Cong Tang
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
- The First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an, Shannxi 710061, P.R. China
| | - Qiankun Niu
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Danielle Cicka
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Yuhong Du
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
- Emory Chemical Biology Discovery Center, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Xiulei Mo
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Haian Fu
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
- Emory Chemical Biology Discovery Center, Emory University School of Medicine, Atlanta, GA 30322, USA
- Department of Hematology and Medical Oncology and Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA
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18
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Nath N, Godat B, Flemming R, Urh M. Deciphering the Interaction between Neonatal Fc Receptor and Antibodies Using a Homogeneous Bioluminescent Immunoassay. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2021; 207:1211-1221. [PMID: 34312257 PMCID: PMC8358922 DOI: 10.4049/jimmunol.2100181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 05/22/2021] [Indexed: 11/19/2022]
Abstract
Long half-life of therapeutic Abs and Fc fusion proteins is crucial to their efficacy and is, in part, regulated by their interaction with neonatal Fc receptor (FcRn). However, the current methods (e.g., surface plasmon resonance and biolayer interferometry) for measurement of interaction between IgG and FcRn (IgG/FcRn) require either FcRn or IgG to be immobilized on the surface, which is known to introduce experimental artifacts and have led to conflicting data. To study IgG/FcRn interactions in solution, without a need for surface immobilization, we developed a novel (to our knowledge), solution-based homogeneous binding immunoassay based on NanoBiT luminescent protein complementation technology. We optimized the assay (NanoBiT FcRn assay) for human FcRn, mouse FcRn, rat FcRn, and cynomolgus FcRn and used them to determine the binding affinities of a panel of eight Abs. Assays could successfully capture the modulation in IgG/FcRn binding based on changes in Fc fragment of the Abs. We also looked at the individual contribution of Fc and F(ab)2 on the IgG/FcRn interaction and found that Fc is the main driver for the interaction at pH 6. Our work highlights the importance of using orthogonal methods to validate affinity data generated using biosensor platforms. Moreover, the simple add-and-read format of the NanoBiT FcRn assay is amenable for high-throughput screening during early Ab discovery phase.
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Affiliation(s)
- Nidhi Nath
- Research and Development Department, Promega Corp., Madison, WI
| | - Becky Godat
- Research and Development Department, Promega Corp., Madison, WI
| | - Rod Flemming
- Research and Development Department, Promega Corp., Madison, WI
| | - Marjeta Urh
- Research and Development Department, Promega Corp., Madison, WI
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19
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Mathai N, Stork C, Kirchmair J. BonMOLière: Small-Sized Libraries of Readily Purchasable Compounds, Optimized to Produce Genuine Hits in Biological Screens across the Protein Space. Int J Mol Sci 2021; 22:ijms22157773. [PMID: 34360558 PMCID: PMC8346018 DOI: 10.3390/ijms22157773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 07/13/2021] [Accepted: 07/15/2021] [Indexed: 12/21/2022] Open
Abstract
Experimental screening of large sets of compounds against macromolecular targets is a key strategy to identify novel bioactivities. However, large-scale screening requires substantial experimental resources and is time-consuming and challenging. Therefore, small to medium-sized compound libraries with a high chance of producing genuine hits on an arbitrary protein of interest would be of great value to fields related to early drug discovery, in particular biochemical and cell research. Here, we present a computational approach that incorporates drug-likeness, predicted bioactivities, biological space coverage, and target novelty, to generate optimized compound libraries with maximized chances of producing genuine hits for a wide range of proteins. The computational approach evaluates drug-likeness with a set of established rules, predicts bioactivities with a validated, similarity-based approach, and optimizes the composition of small sets of compounds towards maximum target coverage and novelty. We found that, in comparison to the random selection of compounds for a library, our approach generates substantially improved compound sets. Quantified as the "fitness" of compound libraries, the calculated improvements ranged from +60% (for a library of 15,000 compounds) to +184% (for a library of 1000 compounds). The best of the optimized compound libraries prepared in this work are available for download as a dataset bundle ("BonMOLière").
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Affiliation(s)
- Neann Mathai
- Computational Biology Unit (CBU) and Department of Chemistry, University of Bergen, N-5020 Bergen, Norway;
| | - Conrad Stork
- Center for Bioinformatics (ZBH), Department of Informatics, Universität Hamburg, 20146 Hamburg, Germany;
| | - Johannes Kirchmair
- Computational Biology Unit (CBU) and Department of Chemistry, University of Bergen, N-5020 Bergen, Norway;
- Division of Pharmaceutical Chemistry, Department of Pharmaceutical Sciences, University of Vienna, 1090 Vienna, Austria
- Correspondence:
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20
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Vilela AFL, Narciso Dos Reis VE, Cardoso CL. Co-Immobilized Capillary Enzyme Reactor Based on Beta-Secretase1 and Acetylcholinesterase: A Model for Dual-Ligand Screening. Front Chem 2021; 9:708374. [PMID: 34307303 PMCID: PMC8295500 DOI: 10.3389/fchem.2021.708374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 06/23/2021] [Indexed: 11/13/2022] Open
Abstract
We have developed a dual enzymatic system assay involving liquid chromatography-mass spectrometry (LC–MS) to screen AChE and BACE1 ligands. A fused silica capillary (30 cm × 0.1 mm i.d. × 0.362 mm e.d.) was used as solid support. The co-immobilization procedure encompassed two steps and random immobilization. The resulting huAChE+BACE1-ICER/MS was characterized by using acetylcholine (ACh) and JMV2236 as substrates. The best conditions for the dual enzymatic system assay were evaluated and compared to the conditions of the individual enzymatic system assays. Analysis was performed in series for each enzyme. The kinetic parameters (KMapp) and inhibition assays were evaluated. To validate the system, galantamine and a β-secretase inhibitor were employed as standard inhibitors, which confirmed that the developed screening assay was able to identify reference ligands and to provide quantitative parameters. The combination of these two enzymes in a single on-line system allowed possible multi-target inhibitors to be screened and identified. The innovative huAChE+BACE1-ICER/MS dual enzymatic system reported herein proved to be a reliable tool to identify and to characterize hit ligands for AChE and BACE1 in an enzymatic competitive environment. This innovative system assay involved lower costs; measured the product from enzymatic hydrolysis directly by MS; enabled immediate recovery of the enzymatic activity; showed specificity, selectivity, and sensitivity; and mimicked the cellular process.
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Affiliation(s)
- Adriana Ferreira Lopes Vilela
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Vitor Eduardo Narciso Dos Reis
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Carmen Lúcia Cardoso
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
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21
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Devkota K, Schapira M, Perveen S, Khalili Yazdi A, Li F, Chau I, Ghiabi P, Hajian T, Loppnau P, Bolotokova A, Satchell KJF, Wang K, Li D, Liu J, Smil D, Luo M, Jin J, Fish PV, Brown PJ, Vedadi M. Probing the SAM Binding Site of SARS-CoV-2 Nsp14 In Vitro Using SAM Competitive Inhibitors Guides Developing Selective Bisubstrate Inhibitors. SLAS DISCOVERY 2021; 26:1200-1211. [PMID: 34192965 PMCID: PMC8458670 DOI: 10.1177/24725552211026261] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The COVID-19 pandemic has clearly brought the healthcare systems worldwide to a breaking point, along with devastating socioeconomic consequences. The SARS-CoV-2 virus, which causes the disease, uses RNA capping to evade the human immune system. Nonstructural protein (nsp) 14 is one of the 16 nsps in SARS-CoV-2 and catalyzes the methylation of the viral RNA at N7-guanosine in the cap formation process. To discover small-molecule inhibitors of nsp14 methyltransferase (MTase) activity, we developed and employed a radiometric MTase assay to screen a library of 161 in-house synthesized S-adenosylmethionine (SAM) competitive MTase inhibitors and SAM analogs. Among six identified screening hits, SS148 inhibited nsp14 MTase activity with an IC50 value of 70 ± 6 nM and was selective against 20 human protein lysine MTases, indicating significant differences in SAM binding sites. Interestingly, DS0464 with an IC50 value of 1.1 ± 0.2 µM showed a bisubstrate competitive inhibitor mechanism of action. DS0464 was also selective against 28 out of 33 RNA, DNA, and protein MTases. The structure-activity relationship provided by these compounds should guide the optimization of selective bisubstrate nsp14 inhibitors and may provide a path toward a novel class of antivirals against COVID-19, and possibly other coronaviruses.
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Affiliation(s)
- Kanchan Devkota
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Matthieu Schapira
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
| | - Sumera Perveen
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | | | - Fengling Li
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Irene Chau
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Pegah Ghiabi
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Taraneh Hajian
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Peter Loppnau
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Albina Bolotokova
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Karla J F Satchell
- Department of Microbiology-Immunology, Northwestern University, Center for Structural Genomics of Infectious Diseases, Feinberg School of Medicine, Chicago, IL, USA
| | - Ke Wang
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Program of Pharmacology, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - Deyao Li
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Program of Pharmacology, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - Jing Liu
- Departments of Pharmacological Sciences and Oncological Sciences, Mount Sinai Center for Therapeutics Discovery, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - David Smil
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Minkui Luo
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Program of Pharmacology, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - Jian Jin
- Departments of Pharmacological Sciences and Oncological Sciences, Mount Sinai Center for Therapeutics Discovery, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Paul V Fish
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, London, UK
| | - Peter J Brown
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada
| | - Masoud Vedadi
- Structural Genomics Consortium, University of Toronto, Toronto, ON, Canada.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
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22
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Chen W, Chen X, Li D, Zhou J, Jiang Z, You Q, Guo X. Discovery of DDO-2213 as a Potent and Orally Bioavailable Inhibitor of the WDR5-Mixed Lineage Leukemia 1 Protein-Protein Interaction for the Treatment of MLL Fusion Leukemia. J Med Chem 2021; 64:8221-8245. [PMID: 34105966 DOI: 10.1021/acs.jmedchem.1c00091] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
WD repeat-containing protein 5 (WDR5) is essential for the stability and methyltransferase activity of the mixed lineage leukemia 1 (MLL1) complex. Dysregulation of the MLL1 gene is associated with human acute leukemias, and the direct disruption of the WDR5-MLL1 protein-protein interaction (PPI) is emerging as an alternative strategy for MLL-rearranged cancers. Here, we represent a new aniline pyrimidine scaffold for WDR5-MLL1 inhibitors. A comprehensive structure-activity analysis identified a potent inhibitor 63 (DDO-2213), with an IC50 of 29 nM in a competitive fluorescence polarization assay and a Kd value of 72.9 nM for the WDR5 protein. Compound 63 selectively inhibited MLL histone methyltransferase activity and the proliferation of MLL translocation-harboring cells. Furthermore, 63 displayed good pharmacokinetic properties and suppressed the growth of MV4-11 xenograft tumors in mice after oral administration, first verifying the in vivo efficacy of targeting the WDR5-MLL1 PPI by small molecules.
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Affiliation(s)
- Weilin Chen
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
- Department of Medicinal Chemistry, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Xin Chen
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Dongdong Li
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Jianrui Zhou
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Zhengyu Jiang
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Qidong You
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Xiaoke Guo
- Jiangsu Key Laboratory of Drug Design and Optimization and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
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23
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Ligand Discovery: High-Throughput Binding: Fluorescence Polarization (Anisotropy). Methods Mol Biol 2021. [PMID: 33877601 DOI: 10.1007/978-1-0716-1197-5_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
High-throughput assays based on fluorescence polarization (or fluorescence anisotropy) technology have often been employed for primary hit-finding in drug discovery. These binding assays provide a homogeneous format and consistent performance and offer advantages over some other optical methods. Developments in assay design and improvements in fluorescent probes have enabled the application of the technique to even complex biological systems. Here we describe the practical considerations for development of FP assays applied in high-throughput screening, including fluorophore selection, assay design, data analysis, and approaches for detecting compound interference.
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24
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Padilla-Coley S, Rudebeck EE, Smith BD, Pfeffer FM. Intracellular fluorescence competition assay for inhibitor engagement of histone deacetylase. Bioorg Med Chem Lett 2021; 47:128207. [PMID: 34146703 DOI: 10.1016/j.bmcl.2021.128207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/08/2021] [Accepted: 06/13/2021] [Indexed: 10/21/2022]
Abstract
An intracellular fluorescence competition assay was developed to assess the capability of inhibitor candidates to engage histone deacetylase (HDAC) inside living cells and thus diminish cell uptake and staining by the HDAC-targeted fluorescent probe APS. Fluorescence cell microscopy and flow cytometry showed that pre-incubation of living cells with candidate inhibitors led to diminished cell uptake of the fluorescent probe. The assay was effective because the fluorescent probe (APS) possessed the required performance properties, including bright fluorescence, ready membrane diffusion, selective intracellular HDAC affinity, and negligible acute cytotoxicity. The concept of an intracellular fluorescence competition assay is generalizable and has broad applicability since it obviates the requirement to use the isolated biomacromolecule target for screening of molecular candidates with target affinity.
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Affiliation(s)
- Sasha Padilla-Coley
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, United States
| | - Elley E Rudebeck
- School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Victoria 3216, Australia
| | - Bradley D Smith
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, United States
| | - Frederick M Pfeffer
- School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Victoria 3216, Australia.
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25
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Nichols PL. Automated and enabling technologies for medicinal chemistry. PROGRESS IN MEDICINAL CHEMISTRY 2021; 60:191-272. [PMID: 34147203 DOI: 10.1016/bs.pmch.2021.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Having always been driven by the need to get new treatments to patients as quickly as possible, drug discovery is a constantly evolving process. This chapter will review how medicinal chemistry was established, how it has changed over the years due to the emergence of new enabling technologies, and how early advances in synthesis, purification and analysis, have provided the foundations upon which the current automated and enabling technologies are built. Looking beyond the established technologies, this chapter will also consider technologies that are now emerging, and their impact on the future of drug discovery and the role of medicinal chemists.
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Affiliation(s)
- Paula L Nichols
- Synple Chem AG, Kemptthal, Switzerland; ETH, Zurich, Switzerland.
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26
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Devkota K, Schapira M, Perveen S, Yazdi AK, Li F, Chau I, Ghiabi P, Hajian T, Loppnau P, Bolotokova A, Satchell KJF, Wang K, Li D, Liu J, Smil D, Luo M, Jin J, Fish PV, Brown PJ, Vedadi M. Probing the SAM Binding Site of SARS-CoV-2 nsp14 in vitro Using SAM Competitive Inhibitors Guides Developing Selective bi-substrate Inhibitors. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2021:2021.02.19.424337. [PMID: 33619486 PMCID: PMC7899450 DOI: 10.1101/2021.02.19.424337] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The COVID-19 pandemic has clearly brought the healthcare systems world-wide to a breaking point along with devastating socioeconomic consequences. The SARS-CoV-2 virus which causes the disease uses RNA capping to evade the human immune system. Non-structural protein (nsp) 14 is one of the 16 nsps in SARS-CoV-2 and catalyzes the methylation of the viral RNA at N7-guanosine in the cap formation process. To discover small molecule inhibitors of nsp14 methyltransferase (MT) activity, we developed and employed a radiometric MT assay to screen a library of 161 in house synthesized S-adenosylmethionine (SAM) competitive methyltransferase inhibitors and SAM analogs. Among seven identified screening hits, SS148 inhibited nsp14 MT activity with an IC 50 value of 70 ± 6 nM and was selective against 20 human protein lysine methyltransferases indicating significant differences in SAM binding sites. Interestingly, DS0464 with IC 50 value of 1.1 ± 0.2 μM showed a bi-substrate competitive inhibitor mechanism of action. Modeling the binding of this compound to nsp14 suggests that the terminal phenyl group extends into the RNA binding site. DS0464 was also selective against 28 out of 33 RNA, DNA, and protein methyltransferases. The structure-activity relationship provided by these compounds should guide the optimization of selective bi-substrate nsp14 inhibitors and may provide a path towards a novel class of antivirals against COVID-19, and possibly other coronaviruses.
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Sahasrabuddhe A, Oakley D, Chen K, McCarter JD. Development of a High-Throughput Affinity Mass Spectrometry (AMS) Platform Using Laser Diode Thermal Desorption Ionization Coupled to Mass Spectrometry (LDTD-MS). SLAS DISCOVERY 2020; 26:230-241. [PMID: 33334237 DOI: 10.1177/2472555220979596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Affinity selection mass spectrometry (MS) or, simply, affinity mass spectrometry (AMS) is a label-free technology that has been used to identify high-affinity ligands of target proteins of interest by screening against small-molecule compound libraries and identifying molecules that are enriched in the presence of the target protein. We have previously applied Agilent Technology's (Santa Clara, CA) RapidFire solid-phase extraction (SPE)-based high-throughput MS technology to screen small-molecule libraries using AMS. However, SPE-based technologies rely on fluidics for desalting and separation prior to mass analysis with attendant high solvent consumption, relatively high sample volume requirements, risk of sample carryover, and frequent maintenance. To address these challenges, we have established an AMS platform using a laser diode thermal desorption-atmospheric pressure chemical ionization (LDTD-APCI) ionization source (Phytronix, Quebec, Canada) coupled with a SCIEX 5600+ TripleTOF MS (Framingham, MA). We also validated a data-independent acquisition (DIA) Sequential Window Acquisition of All Theoretical Mass Spectra (SWATH-MS) method for the robust detection and analysis of small-molecule affinity hits. An informatics platform developed in-house has resulted in a streamlined data analysis workflow for high-throughput AMS screening campaigns and reduced data processing time without compromising data quality. Finally, 68,000 compounds were screened in a single plate and affinity selected hits were confirmed in an orthogonal enzyme activity assay.
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Affiliation(s)
| | - Dylan Oakley
- Research Automation Technologies, Thousand Oaks, CA, USA
| | - Kui Chen
- Discovery Technologies, Thousand Oaks, CA, USA
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Ewan HS, Biyani SA, DiDomenico J, Logsdon D, Sobreira TJP, Avramova L, Cooks RG, Thompson DH. Aldol Reactions of Biorenewable Triacetic Acid Lactone Precursor Evaluated Using Desorption Electrospray Ionization Mass Spectrometry High-Throughput Experimentation and Validated by Continuous Flow Synthesis. ACS COMBINATORIAL SCIENCE 2020; 22:796-803. [PMID: 33211961 DOI: 10.1021/acscombsci.0c00119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Desorption electrospray ionization-mass spectrometry (DESI-MS) was used as a high-throughput experimentation (HTE) tool to rapidly identify derivatives of the biobased platform molecule triacetic acid lactone (TAL). TAL is a platform molecule capable of conversion to a wide range of useful commodity chemicals, agrochemicals, and advanced pharmaceutical intermediates. In the present study, a diverse family of aldol reaction mixtures were prepared in high-density microtiter plates with a liquid handling robot, then printed with a pin tool onto a PTFE surface for analysis by DESI-MS. Our DESI-MS results indicate that aldol products of TAL were obtained for each substrate tested, in good agreement with previously reported TAL reactivity. These HTE experiments also revealed solvent-dependent reactivity trends that facilitated reaction scale up. Our findings suggest that DESI-MS analysis can rapidly inform the selection of optimal reaction conditions from a wide variety of conditions for scale up using continuous synthesis conditions.
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Affiliation(s)
- H. Samuel Ewan
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - Shruti A. Biyani
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - Jaycie DiDomenico
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - David Logsdon
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - Tiago J. P. Sobreira
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - Larisa Avramova
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - R. Graham Cooks
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
| | - David H. Thompson
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multidisciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907 United States
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29
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LeBlanc N, Mallette E, Zhang W. Targeted modulation of E3 ligases using engineered ubiquitin variants. FEBS J 2020; 288:2143-2165. [PMID: 32867007 DOI: 10.1111/febs.15536] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/17/2020] [Accepted: 08/21/2020] [Indexed: 12/11/2022]
Abstract
Ubiquitination plays an essential role in signal transduction to regulate most if not all cellular processes. Among the enzymes that are involved in the ubiquitin (Ub) signaling cascade, tremendous efforts have been focused on elucidating the roles of E3 Ub ligases as they determine the complexity and specificity of ubiquitination. Not surprisingly, the malfunction of E3 ligases is directly implicated in many human diseases, including cancer. Therefore, there is an urgent need to develop potent and specific molecules to modulate E3 ligase activity as intracellular probes for target validation and as pharmacological agents in preclinical research. Unfortunately, the progress has been hampered by the dynamic regulation mechanisms for different types of E3 ligases. Here, we summarize the progress of using protein engineering to develop Ub variant (UbV) inhibitors for all major families of E3 ligases and UbV activators for homologous with E6-associated protein C terminus E3s and homodimeric RING E3s. We believe that this provides a general strategy and a valuable toolkit for the research community to inhibit or activate E3 ligases and these synthetic molecules have important implications in exploring protein degradation for drug discovery.
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Affiliation(s)
- Nicole LeBlanc
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON, Canada
| | - Evan Mallette
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON, Canada
| | - Wei Zhang
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON, Canada.,CIFAR Azrieli Global Scholars Program, Canadian Institute for Advanced Research, Toronto, ON, Canada
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30
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Kumar A, Mali P. Mapping regulators of cell fate determination: Approaches and challenges. APL Bioeng 2020; 4:031501. [PMID: 32637855 PMCID: PMC7332300 DOI: 10.1063/5.0004611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 06/01/2020] [Indexed: 12/25/2022] Open
Abstract
Given the limited regenerative capacities of most organs, strategies are needed to efficiently generate large numbers of parenchymal cells capable of integration into the diseased organ. Although it was initially thought that terminally differentiated cells lacked the ability to transdifferentiate, it has since been shown that cellular reprogramming of stromal cells to parenchymal cells through direct lineage conversion holds great potential for the replacement of post-mitotic parenchymal cells lost to disease. To this end, an assortment of genetic, chemical, and mechanical cues have been identified to reprogram cells to different lineages both in vitro and in vivo. However, some key challenges persist that limit broader applications of reprogramming technologies. These include: (1) low reprogramming efficiencies; (2) incomplete functional maturation of derived cells; and (3) difficulty in determining the typically multi-factor combinatorial recipes required for successful transdifferentiation. To improve efficiency by comprehensively identifying factors that regulate cell fate, large scale genetic and chemical screening methods have thus been utilized. Here, we provide an overview of the underlying concept of cell reprogramming as well as the rationale, considerations, and limitations of high throughput screening methods. We next follow with a summary of unique hits that have been identified by high throughput screens to induce reprogramming to various parenchymal lineages. Finally, we discuss future directions of applying this technology toward human disease biology via disease modeling, drug screening, and regenerative medicine.
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Affiliation(s)
- Aditya Kumar
- Department of Bioengineering, University of California, San Diego, La Jolla, California 92093, USA
| | - Prashant Mali
- Department of Bioengineering, University of California, San Diego, La Jolla, California 92093, USA
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31
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Kieffer C, Jourdan JP, Jouanne M, Voisin-Chiret AS. Noncellular screening for the discovery of protein–protein interaction modulators. Drug Discov Today 2020; 25:1592-1603. [DOI: 10.1016/j.drudis.2020.07.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/24/2020] [Accepted: 07/13/2020] [Indexed: 12/31/2022]
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32
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Iyer VS, Jiang L, Shen Y, Boddul SV, Panda SK, Kasza Z, Schmierer B, Wermeling F. Designing custom CRISPR libraries for hypothesis-driven drug target discovery. Comput Struct Biotechnol J 2020; 18:2237-2246. [PMID: 32952937 PMCID: PMC7479249 DOI: 10.1016/j.csbj.2020.08.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 07/24/2020] [Accepted: 08/09/2020] [Indexed: 12/20/2022] Open
Abstract
Over the last decade Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) has been developed into a potent molecular biology tool used to rapidly modify genes or their expression in a multitude of ways. In parallel, CRISPR-based screening approaches have been developed as powerful discovery platforms for dissecting the genetic basis of cellular behavior, as well as for drug target discovery. CRISPR screens can be designed in numerous ways. Here, we give a brief background to CRISPR screens and discuss the pros and cons of different design approaches, including unbiased genome-wide screens that target all known genes, as well as hypothesis-driven custom screens in which selected subsets of genes are targeted (Fig. 1). We provide several suggestions for how a custom screen can be designed, which could broadly serve as inspiration for any experiment that includes candidate gene selection. Finally, we discuss how results from CRISPR screens could be translated into drug development, as well as future trends we foresee in the rapidly evolving CRISPR screen field.
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Affiliation(s)
- Vaishnavi Srinivasan Iyer
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.,School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
| | - Long Jiang
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Yunbing Shen
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Sanjaykumar V Boddul
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Sudeepta Kumar Panda
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.,Structural Genomics Consortium, Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
| | - Zsolt Kasza
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Bernhard Schmierer
- High Throughput Genome Engineering, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.,Science for Life Laboratory, Stockholm, Sweden
| | - Fredrik Wermeling
- Center for Molecular Medicine, Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
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33
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Blay V, Tolani B, Ho SP, Arkin MR. High-Throughput Screening: today's biochemical and cell-based approaches. Drug Discov Today 2020; 25:1807-1821. [PMID: 32801051 DOI: 10.1016/j.drudis.2020.07.024] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 07/01/2020] [Accepted: 07/30/2020] [Indexed: 12/13/2022]
Abstract
High-throughput screening (HTS) provides starting chemical matter in the adventure of developing a new drug. In this review, we survey several HTS methods used today for hit identification, organized in two main flavors: biochemical and cell-based assays. Biochemical assays discussed include fluorescence polarization and anisotropy, FRET, TR-FRET, and fluorescence lifetime analysis. Binding-based methods are also surveyed, including NMR, SPR, mass spectrometry, and DSF. On the other hand, cell-based assays discussed include viability, reporter gene, second messenger, and high-throughput microscopy assays. We devote some emphasis to high-content screening, which is becoming very popular. An advisable stage after hit discovery using phenotypic screens is target deconvolution, and we provide an overview of current chemical proteomics, in silico, and chemical genetics tools. Emphasis is made on recent CRISPR/dCas-based screens. Lastly, we illustrate some of the considerations that inform the choice of HTS methods and point to some areas with potential interest for future research.
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Affiliation(s)
- Vincent Blay
- Division of Biomaterials and Bioengineering, School of Dentistry, University of California San Francisco, San Francisco, CA 94143, USA; Department of Urology, School of Medicine, University of California San Francisco, San Francisco, CA 94143, USA.
| | - Bhairavi Tolani
- Thoracic Oncology Program, Department of Surgery, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA, USA
| | - Sunita P Ho
- Division of Biomaterials and Bioengineering, School of Dentistry, University of California San Francisco, San Francisco, CA 94143, USA; Department of Urology, School of Medicine, University of California San Francisco, San Francisco, CA 94143, USA
| | - Michelle R Arkin
- Department of Pharmaceutical Chemistry and the Small Molecule Discovery Center, University of California, San Francisco, CA, USA.
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34
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Veeranagouda Y, Zachayus JL, Guillemot JC, Venier O, Didier M. High-Throughput Cellular RNA Sequencing (HiCAR-Seq): Cost-Effective, High-Throughput 3' mRNA-Seq Method Enabling Individual Sample Quality Control. ACTA ACUST UNITED AC 2020; 132:e123. [PMID: 32735043 DOI: 10.1002/cpmb.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
High-throughput screening is one of the pillars of drug development. Unbiased transcriptome profiling is now widely used for a deeper understanding of a drug's mechanisms of action, off target effects, and cytotoxicity. Although currently available high-throughput RNA-Seq (HT RNA-Seq) methods such as PLATE-Seq, DRUG-Seq, and BRB-Seq serve these purposes, the inherent nature of these methods does not allow sample-wise sequencing library quality control. Here, we describe an HTR method called High-throughput CellulAr RNA Sequencing (HiCAR-Seq). HiCAR-Seq was optimized to work directly on cultured cells (as little as 1,000 cells) or 10 ng of total RNA. HiCAR-Seq involves reverse transcription from cultured cells or total RNA using oligo-dT primers followed by the PCR amplification of full-length cDNAs using sample-specific barcode primers in individual plate wells. Amplification of cDNA from every sample can be verified using Bioanalyzer. This step not only reveals cDNA amplification but also provides greater precision for pooling equal concentrations of cDNA from different samples. A single pooled cDNA library is made suitable for sequencing on Illumina sequencers using a tagmentation kit. Because HiCAR-Seq targets a small region at the 3' of the mRNAs, as little as 3 to 4 million reads/sample are enough to infer changes in gene expression in human or mouse cells. We believe that HiCAR-Seq represents a robust and competitive addition to the existing set of transcriptome-based high-throughput screening methods. © 2020 Wiley Periodicals LLC. Basic Protocol 1: cDNA synthesis and barcoding/enrichment PCR Basic Protocol 2: Nextera tagmentation/amplification, quantification, and sequencing.
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Affiliation(s)
- Yaligara Veeranagouda
- Molecular Biology and Genomics, Translational Sciences, Sanofi R&D, Chilly-Mazarin, France
| | - Jean-Luc Zachayus
- Proteomics, Translational Sciences, Sanofi R&D, Chilly-Mazarin, France
| | | | - Olivier Venier
- Molecular Design Science Department, Integrated Drug Discovery, Sanofi R&D, Chilly-Mazarin, France
| | - Michel Didier
- Molecular Biology and Genomics, Translational Sciences, Sanofi R&D, Chilly-Mazarin, France
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35
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Coley CW, Eyke NS, Jensen KF. Autonomous Discovery in the Chemical Sciences Part I: Progress. Angew Chem Int Ed Engl 2020; 59:22858-22893. [DOI: 10.1002/anie.201909987] [Citation(s) in RCA: 100] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Indexed: 01/05/2023]
Affiliation(s)
- Connor W. Coley
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Natalie S. Eyke
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Klavs F. Jensen
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
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36
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Coley CW, Eyke NS, Jensen KF. Autonome Entdeckung in den chemischen Wissenschaften, Teil I: Fortschritt. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201909987] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Connor W. Coley
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Natalie S. Eyke
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Klavs F. Jensen
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
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37
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Cooley R, Kara N, Hui NS, Tart J, Roustan C, George R, Hancock DC, Binkowski BF, Wood KV, Ismail M, Downward J. Development of a cell-free split-luciferase biochemical assay as a tool for screening for inhibitors of challenging protein-protein interaction targets. Wellcome Open Res 2020. [DOI: 10.12688/wellcomeopenres.15675.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Targeting the interaction of proteins with weak binding affinities or low solubility represents a particular challenge for drug screening. The NanoLuc ® Binary Technology (NanoBiT ®) was originally developed to detect protein-protein interactions in live mammalian cells. Here we report the successful translation of the NanoBit cellular assay into a biochemical, cell-free format using mammalian cell lysates. We show that the assay is suitable for the detection of both strong and weak protein interactions such as those involving the binding of RAS oncoproteins to either RAF or phosphoinositide 3-kinase (PI3K) effectors respectively, and that it is also effective for the study of poorly soluble protein domains such as the RAS binding domain of PI3K. Furthermore, the RAS interaction assay is sensitive and responds to both strong and weak RAS inhibitors. Our data show that the assay is robust, reproducible, cost-effective, and can be adapted for small and large-scale screening approaches. The NanoBit Biochemical Assay offers an attractive tool for drug screening against challenging protein-protein interaction targets, including the interaction of RAS with PI3K.
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Zhou M, Li W, Li J, Xie L, Wu R, Wang L, Fu S, Su W, Hu J, Wang J, Li P. Phase-separated condensate-aided enrichment of biomolecular interactions for high-throughput drug screening in test tubes. J Biol Chem 2020; 295:11420-11434. [PMID: 32461254 DOI: 10.1074/jbc.ra120.012981] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 05/19/2020] [Indexed: 12/24/2022] Open
Abstract
Modification-dependent and -independent biomolecular interactions, including protein-protein, protein-DNA/RNA, protein-sugar, and protein-lipid interactions, play crucial roles in all cellular processes. Dysregulation of these biomolecular interactions or malfunction of the associated enzymes results in various diseases; therefore, these interactions and enzymes are attractive targets for therapies. High-throughput screening can greatly facilitate the discovery of drugs for these targets. Here, we describe a biomolecular interaction detection method, called phase-separated condensate-aided enrichment of biomolecular interactions in test tubes (CEBIT). The readout of CEBIT is the selective recruitment of biomolecules into phase-separated condensates harboring their cognate binding partners. We tailored CEBIT to detect various biomolecular interactions and activities of biomolecule-modifying enzymes. Using CEBIT-based high-throughput screening assays, we identified known inhibitors of the p53/MDM2 (MDM2) interaction and of the histone methyltransferase, suppressor of variegation 3-9 homolog 1 (SUV39H1), from a compound library. CEBIT is simple and versatile, and is likely to become a powerful tool for drug discovery and basic biomedical research.
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Affiliation(s)
- Min Zhou
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Weiping Li
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Jian Li
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Leiming Xie
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Rongbo Wu
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Liang Wang
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Shuai Fu
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Wei Su
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Jianyang Hu
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Jing Wang
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Pilong Li
- Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
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Tharp JM, Hampton JT, Reed CA, Ehnbom A, Chen PHC, Morse JS, Kurra Y, Pérez LM, Xu S, Liu WR. An amber obligate active site-directed ligand evolution technique for phage display. Nat Commun 2020; 11:1392. [PMID: 32170178 PMCID: PMC7070036 DOI: 10.1038/s41467-020-15057-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 02/14/2020] [Indexed: 01/19/2023] Open
Abstract
Although noncanonical amino acids (ncAAs) were first incorporated into phage libraries through amber suppression nearly two decades ago, their application for use in drug discovery has been limited due to inherent library bias towards sense-containing phages. Here, we report a technique based on superinfection immunity of phages to enrich amber-containing clones, thus avoiding the observed bias that has hindered incorporation of ncAAs into phage libraries. We then take advantage of this technique for development of active site-directed ligand evolution of peptides, where the ncAA serves as an anchor to direct the binding of its peptides to the target’s active site. To demonstrate this, phage-displayed peptide libraries are developed that contain a genetically encoded butyryl lysine and are subsequently used to select for ligands that bind SIRT2. These ligands are then modified to develop low nanomolar inhibitors of SIRT2. Most epigenetic regulator inhibitors target tunnels of active sites, rather than the peptide binding groove, leading to concerns with low selectivity. Here the authors use an amber obligate phage library to rapidly identify isoform-selective inhibitors of SIRT2.
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Affiliation(s)
- Jeffery M Tharp
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - J Trae Hampton
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Catrina A Reed
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Andreas Ehnbom
- Laboratory for Molecular Simulation, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Peng-Hsun Chase Chen
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Jared S Morse
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Yadagirri Kurra
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Lisa M Pérez
- Laboratory for Molecular Simulation, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Shiqing Xu
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA.
| | - Wenshe Ray Liu
- The Texas A&M Drug Discovery Laboratory, Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA. .,Department of Biochemistry & Biophysics, Texas A&M University, College Station, TX, 77843, USA.
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40
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Lumley JA, Sharman G, Wilkin T, Hirst M, Cobas C, Goebel M. A KNIME Workflow for Automated Structure Verification. SLAS DISCOVERY 2020; 25:950-956. [PMID: 32081066 DOI: 10.1177/2472555220907091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Adequate characterization of chemical entities made for biological screening in the drug discovery context is critical. Incorrectly characterized structures lead to mistakes in the interpretation of structure-activity relationships and confuse an already multidimensional optimization problem. Mistakes in the later use of these compounds waste money and valuable resources in a discovery process already under cost pressure. Left unidentified, these errors lead to problems in project data packages during quality review. At worst, they put intellectual property and patent integrity at risk. We describe a KNIME workflow for the early and automated identification of these errors during registration of a new chemical entity into the corporate screening catalog. This Automated Structure Verification workflow provides early identification (within 24 hours) of missing or inconsistent analytical data and therefore reduces any mistakes that inevitably get made. Automated identification removes the burden of work from the chemist submitting the compound into the registration system. No additional work is required unless a problem is identified and the submitter alerted. Before implementation, 14% of samples within the existing sample catalog were missing data on initial pass. A year after implementation, only 0.2% were missing data.
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Affiliation(s)
- James A Lumley
- Research IT, Eli Lilly and Company, Windlesham, Surrey, UK
| | - Gary Sharman
- Analytical Technologies, Eli Lilly and Company, Windlesham, Surrey, UK
| | - Thomas Wilkin
- Research IT, Eli Lilly and Company, Windlesham, Surrey, UK
| | - Matthew Hirst
- Research IT, Eli Lilly and Company, Windlesham, Surrey, UK
| | - Carlos Cobas
- Mestrelab Research, S.L., Santiago de Compostela, Galicia, Spain
| | - Michael Goebel
- Mestrelab Research, S.L., Santiago de Compostela, Galicia, Spain
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41
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Cooley R, Kara N, Hui NS, Tart J, Roustan C, George R, Hancock DC, Binkowski BF, Wood KV, Ismail M, Downward J. Development of a cell-free split-luciferase biochemical assay as a tool for screening for inhibitors of challenging protein-protein interaction targets. Wellcome Open Res 2020; 5:20. [PMID: 32587898 PMCID: PMC7308888 DOI: 10.12688/wellcomeopenres.15675.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2020] [Indexed: 12/14/2022] Open
Abstract
Targeting the interaction of proteins with weak binding affinities or low solubility represents a particular challenge for drug screening. The NanoLuc â ® Binary Technology (NanoBiT â ®) was originally developed to detect protein-protein interactions in live mammalian cells. Here we report the successful translation of the NanoBit cellular assay into a biochemical, cell-free format using mammalian cell lysates. We show that the assay is suitable for the detection of both strong and weak protein interactions such as those involving the binding of RAS oncoproteins to either RAF or phosphoinositide 3-kinase (PI3K) effectors respectively, and that it is also effective for the study of poorly soluble protein domains such as the RAS binding domain of PI3K. Furthermore, the RAS interaction assay is sensitive and responds to both strong and weak RAS inhibitors. Our data show that the assay is robust, reproducible, cost-effective, and can be adapted for small and large-scale screening approaches. The NanoBit Biochemical Assay offers an attractive tool for drug screening against challenging protein-protein interaction targets, including the interaction of RAS with PI3K.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Julian Downward
- Francis Crick Institute, London, UK
- Institute of Cancer Research, UK, London, UK
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42
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Ianevski A, Giri AK, Gautam P, Kononov A, Potdar S, Saarela J, Wennerberg K, Aittokallio T. Prediction of drug combination effects with a minimal set of experiments. NAT MACH INTELL 2019; 1:568-577. [PMID: 32368721 DOI: 10.1038/s42256-019-0122-4] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
High-throughput drug combination screening provides a systematic strategy to discover unexpected combinatorial synergies in pre-clinical cell models. However, phenotypic combinatorial screening with multi-dose matrix assays is experimentally expensive, especially when the aim is to identify selective combination synergies across a large panel of cell lines or patient samples. Here we implemented DECREASE, an efficient machine learning model that requires only a limited set of pairwise dose-response measurements for accurate prediction of drug combination synergy and antagonism. Using a compendium of 23,595 drug combination matrices tested in various cancer cell lines, and malaria and Ebola infection models, we demonstrate how cost-effective experimental designs with DECREASE capture almost the same degree of information for synergy and antagonism detection as the fully-measured dose-response matrices. Measuring only the diagonal of the matrix provides an accurate and practical option for combinatorial screening. The open-source web-implementation enables applications of DECREASE to both pre-clinical and translational studies.
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Affiliation(s)
- Aleksandr Ianevski
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland.,Helsinki Institute for Information Technology (HIIT), Department of Computer Science, Aalto University, FI-02150 Espoo, Finland
| | - Anil K Giri
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland
| | - Prson Gautam
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland
| | - Alexander Kononov
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland
| | - Swapnil Potdar
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland
| | - Jani Saarela
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland
| | - Krister Wennerberg
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland.,Biotech Research & Innovation Centre (BRIC) and the Novo Nordisk Foundation Center for Stem Cell Biology (DanStem), University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Tero Aittokallio
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, FI-00290 Helsinki, Finland.,Helsinki Institute for Information Technology (HIIT), Department of Computer Science, Aalto University, FI-02150 Espoo, Finland.,Department of Mathematics and Statistics, University of Turku, Quantum, FI-20014 Turku, Finland
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43
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Tan JL, Li F, Yeo JZ, Yong KJ, Bassal MA, Ng GH, Lee MY, Leong CY, Tan HK, Wu CS, Liu BH, Chan TH, Tan ZH, Chan YS, Wang S, Lim ZH, Toh TB, Hooi L, Low KN, Ma S, Kong NR, Stein AJ, Wu Y, Thangavelu MT, Suzuki A, Periyasamy G, Asara JM, Dan YY, Bonney GK, Chow EK, Lu GD, Ng HH, Kanagasundaram Y, Ng SB, Tam WL, Tenen DG, Chai L. New High-Throughput Screening Identifies Compounds That Reduce Viability Specifically in Liver Cancer Cells That Express High Levels of SALL4 by Inhibiting Oxidative Phosphorylation. Gastroenterology 2019; 157:1615-1629.e17. [PMID: 31446059 PMCID: PMC7309153 DOI: 10.1053/j.gastro.2019.08.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 07/18/2019] [Accepted: 08/09/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS Some oncogenes encode transcription factors, but few drugs have been successfully developed to block their activity specifically in cancer cells. The transcription factor SALL4 is aberrantly expressed in solid tumor and leukemia cells. We developed a screen to identify compounds that reduce the viability of liver cancer cells that express high levels of SALL4, and we investigated their mechanisms. METHODS We developed a stringent high-throughput screening platform comprising unmodified SNU-387 and SNU-398 liver cancer cell lines and SNU-387 cell lines engineered to express low and high levels of SALL4. We screened 1597 pharmacologically active small molecules and 21,575 natural product extracts from plant, bacteria, and fungal sources for those that selectively reduce the viability of cells with high levels of SALL4 (SALL4hi cells). We compared gene expression patterns of SALL4hi cells vs SALL4-knockdown cells using RNA sequencing and real-time polymerase chain reaction analyses. Xenograft tumors were grown in NOD/SCID gamma mice from SALL4hi SNU-398 or HCC26.1 cells or from SALL4lo patient-derived xenograft (PDX) cells; mice were given injections of identified compounds or sorafenib, and the effects on tumor growth were measured. RESULTS Our screening identified 1 small molecule (PI-103) and 4 natural compound analogues (oligomycin, efrapeptin, antimycin, and leucinostatin) that selectively reduced viability of SALL4hi cells. We performed validation studies, and 4 of these compounds were found to inhibit oxidative phosphorylation. The adenosine triphosphate (ATP) synthase inhibitor oligomycin reduced the viability of SALL4hi hepatocellular carcinoma and non-small-cell lung cancer cell lines with minimal effects on SALL4lo cells. Oligomycin also reduced the growth of xenograft tumors grown from SALL4hi SNU-398 or HCC26.1 cells to a greater extent than sorafenib, but oligomycin had little effect on tumors grown from SALL4lo PDX cells. Oligomycin was not toxic to mice. Analyses of chromatin immunoprecipitation sequencing data showed that SALL4 binds approximately 50% of mitochondrial genes, including many oxidative phosphorylation genes, to activate their transcription. In comparing SALL4hi and SALL4-knockdown cells, we found SALL4 to increase oxidative phosphorylation, oxygen consumption rate, mitochondrial membrane potential, and use of oxidative phosphorylation-related metabolites to generate ATP. CONCLUSIONS In a screening for compounds that reduce the viability of cells that express high levels of the transcription factor SALL4, we identified inhibitors of oxidative phosphorylation, which slowed the growth of xenograft tumors from SALL4hi cells in mice. SALL4 activates the transcription of genes that regulate oxidative phosphorylation to increase oxygen consumption, mitochondrial membrane potential, and ATP generation in cancer cells. Inhibitors of oxidative phosphorylation might be used for the treatment of liver tumors with high levels of SALL4.
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Affiliation(s)
- Justin L Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Feng Li
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Joanna Z Yeo
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Kol Jia Yong
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Mahmoud A Bassal
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts
| | - Guo Hao Ng
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - May Yin Lee
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Chung Yan Leong
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Hong Kee Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Chan-Shuo Wu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Bee Hui Liu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Tim H Chan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Zi Hui Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Yun Shen Chan
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Siyu Wang
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Zhi Han Lim
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Tan Boon Toh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Lissa Hooi
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Kia Ngee Low
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Siming Ma
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Nikki R Kong
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Alicia J Stein
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Yue Wu
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts; Department of Clinical Laboratory, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Matan T Thangavelu
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Atsushi Suzuki
- Division of Organogenesis and Regeneration, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Giridharan Periyasamy
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - John M Asara
- Department of Medicine, Division of Signal Transduction, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Yock Young Dan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Division of Gastroenterology and Hepatology, University Medicine Cluster, National University Health System, Singapore
| | - Glenn K Bonney
- Department of Hepatobiliary, Pancreatic Surgery and Liver Transplantation, Department of Surgery, University Surgical Cluster, National University Health System, Singapore; National University Centre for Organ Transplantation, National University Hospital, Singapore
| | - Edward K Chow
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Guo-Dong Lu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, China; Key Laboratory of High-Incidence-Tumor Prevention and Treatment (Guangxi Medical University), Ministry of Education of China, Nanning, China
| | - Huck Hui Ng
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | | | - Siew Bee Ng
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Wai Leong Tam
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore
| | - Daniel G Tenen
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts.
| | - Li Chai
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
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44
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Pang JKS, Phua QH, Soh BS. Applications of miRNAs in cardiac development, disease progression and regeneration. Stem Cell Res Ther 2019; 10:336. [PMID: 31752983 PMCID: PMC6868784 DOI: 10.1186/s13287-019-1451-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/07/2019] [Accepted: 10/11/2019] [Indexed: 12/25/2022] Open
Abstract
Development of the complex human heart is tightly regulated at multiple levels, maintaining multipotency and proliferative state in the embryonic cardiovascular progenitors and thereafter suppressing progenitor characteristics to allow for terminal differentiation and maturation. Small regulatory microRNAs (miRNAs) are at the level of post-transcriptional gene suppressors, which enhance the degradation or decay of their target protein-coding mRNAs. These miRNAs are known to play roles in a large number of biological events, cardiovascular development being no exception. A number of critical cardiac-specific miRNAs have been identified, of which structural developmental defects have been linked to dysregulation of miRNAs in the proliferating cardiac stem cells. These miRNAs present in the stem cell niche are lost when the cardiac progenitors terminally differentiate, resulting in the postnatal mitotic arrest of the heart. Therapeutic applications of these miRNAs extend to the realm of heart failure, whereby the death of heart cells in the ageing heart cannot be replaced due to the arrest of cell division. By utilizing miRNA therapy to control cell cycling, the regenerative potential of matured myocardium can be restored. This review will address the various cardiac progenitor-related miRNAs that control the development and proliferative potential of the heart.
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Affiliation(s)
- Jeremy Kah Sheng Pang
- Disease Modeling and Therapeutics Laboratory, A*STAR Institute of Molecular and Cell Biology, 61 Biopolis Drive Proteos, Singapore, 138673, Singapore.,Department of Biological Sciences, National University of Singapore, Singapore, 117543, Singapore
| | - Qian Hua Phua
- Disease Modeling and Therapeutics Laboratory, A*STAR Institute of Molecular and Cell Biology, 61 Biopolis Drive Proteos, Singapore, 138673, Singapore
| | - Boon-Seng Soh
- Disease Modeling and Therapeutics Laboratory, A*STAR Institute of Molecular and Cell Biology, 61 Biopolis Drive Proteos, Singapore, 138673, Singapore. .,Department of Biological Sciences, National University of Singapore, Singapore, 117543, Singapore. .,Key Laboratory for Major Obstetric Diseases of Guangdong Province, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China.
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45
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Byun WG, Lim D, Park SB. Discovery of Small-Molecule Modulators of Protein-RNA Interactions by Fluorescence Intensity-Based Binding Assay. Chembiochem 2019; 21:818-824. [PMID: 31587454 DOI: 10.1002/cbic.201900467] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 10/04/2019] [Indexed: 12/18/2022]
Abstract
Protein-RNA interactions mediate various cellular processes, the dysregulation of which has been associated with a list of diseases. Thus, novel experimental tools for monitoring protein-RNA interactions are highly desirable to identify new chemical modulators of these therapeutic targets. In this study, we constructed simple fluorescence intensity-based protein-RNA binding assays by testing multiple environment-sensitive organic fluorophores. We selected the oncogenic interaction between Lin28 and the let-7 microRNA and the important immunomodulatory Roquin-Tnf CDE interaction as representative targets. We adapted this assay to high-throughput screening for the identification of pyrazolyl thiazolidinedione-type molecules as potent small-molecule inhibitors of protein-microRNA interactions. We clearly showed the structure-activity relationships of this new class of Lin28-let-7 interaction inhibitors, and confirmed that cellular mature let-7 microRNAs and their target genes could be modulated upon treatment with the pyrazolyl thiazolidinedione-type inhibitor. We expect that our simple and adaptable screening approach can be applied for the development of various assay systems aimed at the identification of bioactive small molecules targeting protein-RNA interactions.
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Affiliation(s)
- Wan Gi Byun
- CRI Center for Chemical Proteomics, Department of Chemistry, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 08826, South Korea
| | - Donghyun Lim
- Department of Biophysics and Chemical Biology, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 08826, South Korea
| | - Seung Bum Park
- CRI Center for Chemical Proteomics, Department of Chemistry, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 08826, South Korea.,Department of Biophysics and Chemical Biology, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 08826, South Korea
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46
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Stubbs C, Congdon T, Davis J, Lester D, Richards SJ, Gibson MI. High-Throughput Tertiary Amine Deoxygenated Photopolymerizations for Synthesizing Polymer Libraries. Macromolecules 2019; 52:7603-7612. [PMID: 31656323 PMCID: PMC6812069 DOI: 10.1021/acs.macromol.9b01714] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Indexed: 12/19/2022]
Abstract
The huge chemical space potential of synthetic polymers means that in many studies only a small parameter range can be realistically synthesized in a short time and hence the "best" formulations may not be optimum. Throughput is traditionally limited by the need for deoxygenation in radical polymerizations, but advances in photopolymerization now provide opportunities for "in-air" polymerizations. Here, we have developed a protocol using liquid handling robots (or multichannel pipettes) with blue light photolysis of reversible addition fragmentation chain transfer agents and tertiary amine deoxygenation to enable the synthesis of polymer libraries in industry-standard 96-well plates with no specialized infrastructure and no degassing step. The roles of solvents and amine deoxygenators are explored to optimize the polymerization, particularly to look at alternatives to dimethyl sulfoxide (DMSO) for hydrophobic monomer (co)polymerization. DMSO is shown to aid the degassing process but is not easy to remove and hence prevents isolation of pure polymers. In contrast, using dioxane in-plate evaporation or precipitation of the tertiary amine allowed isolation of polymers in-plate. This removed all reaction components yielding pure polymers, which is not easily achieved with systems using metal catalysts and secondary reductants, such as ascorbic acid. As an example of the throughput, in just under 40 h, 392 polymers were synthesized and subsequently analyzed direct from plates by a 96-well plate sampling size exclusion chromatography system to demonstrate reproducibility. Due to less efficient degassing in dioxane (compared to DMSO), the molecular weight and dispersity control were limited in some cases (with acrylates giving the lowest dispersities), but the key aim of this system is to access hundreds of polymers quickly and in a format needed to enable testing. This method enables easy exploration of chemical space and development of screening libraries to identify hits for further study using precision polymerization methods.
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Affiliation(s)
- Christopher Stubbs
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
| | - Thomas Congdon
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
| | - Jessica Davis
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
| | - Daniel Lester
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
| | - Sarah-Jane Richards
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
| | - Matthew I. Gibson
- Department
of Chemistry and Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.
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47
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Loren BP, Ewan HS, Avramova L, Ferreira CR, Sobreira TJP, Yammine K, Liao H, Cooks RG, Thompson DH. High Throughput Experimentation Using DESI-MS to Guide Continuous-Flow Synthesis. Sci Rep 2019; 9:14745. [PMID: 31611590 PMCID: PMC6791872 DOI: 10.1038/s41598-019-50638-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 09/17/2019] [Indexed: 12/12/2022] Open
Abstract
We demonstrate the use of accelerated reactions with desorption electrospray ionization mass spectrometry (DESI-MS) as a tool for predicting the outcome of microfluidic reactions. DESI-MS was employed as a high throughput experimentation tool to provide qualitative predictions of reaction outcomes, so that vast regions of chemical reactivity space may be more rapidly explored and areas of optimal efficiency identified. This work is part of a larger effort to accelerate reaction optimization to enable the rapid development of continuous-flow syntheses of small molecules in high yield. In order to build confidence in this approach, however, it is necessary to establish a robust predictive connection between reactions performed under analogous DESI-MS, batch, and microfluidic reaction conditions. In the present work, we explore the potential of high throughput DESI-MS experiments to identify trends in reactivity based on chemical structure, solvent, temperature, and stoichiometry that are consistent across these platforms. N-alkylation reactions were used as the test case due to their ease of reactant and product detection by electrospray ionization mass spectrometry (ESI-MS) and their great importance in API synthesis. While DESI-MS narrowed the scope of possibilities for reaction selection among some parameters such as solvent, others like stoichiometry and temperature still required further optimization under continuous synthesis conditions. DESI-MS high throughput experimentation (HTE) reaction evaluation significantly reduced the search space for flow chemistry optimization, thus representing a significant savings in time and materials to achieve a desired transformation with high efficiency.
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Affiliation(s)
- Bradley P Loren
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - H Samuel Ewan
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - Larisa Avramova
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - Christina R Ferreira
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - Tiago J P Sobreira
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - Kathryn Yammine
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - Huiying Liao
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA
| | - R Graham Cooks
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA.
| | - David H Thompson
- Department of Chemistry, Purdue University, Purdue University Center for Cancer Research, Multi-disciplinary Cancer Research Facility, Bindley Bioscience Center, 1203 W. State Street, West Lafayette, IN, 47907, USA.
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48
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Sato Y, Aiba Y, Yajima S, Tanabe T, Higuchi K, Nishizawa S. Strong Binding and Off–On Signaling Functions of Deep‐Red Fluorescent TO‐PRO‐3 for Influenza A Virus RNA Promoter Region. Chembiochem 2019; 20:2752-2756. [DOI: 10.1002/cbic.201900331] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Yusuke Sato
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
| | - Yuri Aiba
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
| | - Sayaka Yajima
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
| | - Takaaki Tanabe
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
| | - Kei Higuchi
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
| | - Seiichi Nishizawa
- Department of ChemistryGraduate School of ScienceTohoku University Sendai 980-8578 Japan
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49
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Baum K, Schuchhardt J, Wolf J, Busse D. Of Gene Expression and Cell Division Time: A Mathematical Framework for Advanced Differential Gene Expression and Data Analysis. Cell Syst 2019; 9:569-579.e7. [PMID: 31521604 DOI: 10.1016/j.cels.2019.07.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 04/15/2019] [Accepted: 07/23/2019] [Indexed: 12/31/2022]
Abstract
Estimating fold changes of average mRNA and protein molecule counts per cell is the most common way to perform differential expression analysis. However, these gene expression data may be affected by cell division, an often-neglected phenomenon. Here, we develop a quantitative framework that links population-based mRNA and protein measurements to rates of gene expression in single cells undergoing cell division. The equations we derive are easy-to-use and widely robust against biological variability. They integrate multiple "omics" data into a coherent, quantitative description of single-cell gene expression and improve analysis when comparing systems or states with different cell division times. We explore these ideas in the context of resting versus activated B cells. Analyzing differences in protein synthesis rates enables to account for differences in cell division times. We demonstrate that this improves the resolution and hit rate of differential gene expression analysis when compared to analyzing population protein abundances alone.
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Affiliation(s)
- Katharina Baum
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Str. 10, 13125 Berlin, Germany; Luxembourg Institute of Health, 1A-B rue Thomas Edison, L-1445 Strassen, Luxembourg.
| | | | - Jana Wolf
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Str. 10, 13125 Berlin, Germany.
| | - Dorothea Busse
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Str. 10, 13125 Berlin, Germany; Integrative Research Institute for the Life Sciences, Humboldt University Berlin, Philippstr. 13, 10115 Berlin, Germany.
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Tang Y, Li D. Developing a High-Throughput Assay for the Integral Membrane Glycerol 3-Phosphate Acyltransferase. Assay Drug Dev Technol 2019; 17:267-274. [PMID: 31403336 DOI: 10.1089/adt.2019.935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Phospholipid biosynthesis begins with the acylation of glycerol 3-phosphate (G3P). In most Gram-positive bacteria including many pathogens, a membrane protein called PlsY is the only acyltransferase that catalyzes this essential step, making it a potential target for the development of antibiotics. A convenient enzymatic assay should facilitate such drug discovery activities. Previously, we developed a continuous assay by monitoring phosphate, one of the enzymatic product, using a fluorescently labeled phosphate binding protein in a bilayer environment called lipid cubic phase (LCP). However, some intrinsic characteristics of LCP, such as high viscosity, make the assay incompatible with common high-throughput liquid-handling platforms. Here, we adapted the assay by hosting PlsY in detergent micelles, enabling us to conduct the assay using standard multi-channel pipets in a high-throughput manner. With optimal enzyme loading, the reaction velocity was linear up to 30 min. PlsY showed Michaelis-Menten kinetics behavior in micelles with a Vmax of 57.5 μmol min-1 mg-1, and Km of 1.14 mM G3P and 6.2 μM acyl phosphate. The inhibitory product lysophosphatidic acid inhibited PlsY with the IC50 of 19 μM. The results principally demonstrated the feasibility of using the assay for high-throughput screening, and the protocol provided an encouraging starting point for further optimization and validation of the assay for automated platforms.
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Affiliation(s)
- Yannan Tang
- Center for Excellence in Molecular Cell Science, National Center for Protein Science Shanghai, Shanghai Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Dianfan Li
- Center for Excellence in Molecular Cell Science, National Center for Protein Science Shanghai, Shanghai Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
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