1
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Nicolau I, Hădade ND, Matache M, Funeriu DP. Synthetic Approaches of Epoxysuccinate Chemical Probes. Chembiochem 2023; 24:e202300157. [PMID: 37096389 DOI: 10.1002/cbic.202300157] [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: 02/26/2023] [Revised: 04/21/2023] [Accepted: 04/23/2023] [Indexed: 04/26/2023]
Abstract
Synthetic chemical probes are powerful tools for investigating biological processes. They are particularly useful for proteomic studies such as activity-based protein profiling (ABPP). These chemical methods initially used mimics of natural substrates. As the techniques gained prominence, more and more elaborate chemical probes with increased specificity towards given enzyme/protein families and amenability to various reaction conditions were used. Among the chemical probes, peptidyl-epoxysuccinates represent one of the first types of compounds used to investigate the activity of the cysteine protease papain-like family of enzymes. Structurally derived from the natural substrate, a wide body of inhibitors and activity- or affinity-based probes bearing the electrophilic oxirane unit for covalent labeling of active enzymes now exists. Herein, we review the literature regarding the synthetic approaches to epoxysuccinate-based chemical probes together with their reported applications, from biological chemistry and inhibition studies to supramolecular chemistry and the formation of protein arrays.
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Affiliation(s)
- Ioana Nicolau
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry, 90 Panduri Street, 050663, Bucharest, Romania
| | - Niculina D Hădade
- Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, Supramolecular and Organometallic Chemistry Centre, 11 Arany Janos Street, 400028, Cluj-Napoca, Romania
| | - Mihaela Matache
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry, 90 Panduri Street, 050663, Bucharest, Romania
| | - Daniel P Funeriu
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry, 90 Panduri Street, 050663, Bucharest, Romania
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2
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Hong SH, Xi SY, Johns AC, Tang LC, Li A, Hum MN, Chartier CA, Jovanovic M, Shah NH. Mapping the Chemical Space of Active-Site Targeted Covalent Ligands for Protein Tyrosine Phosphatases. Chembiochem 2023; 24:e202200706. [PMID: 36893077 PMCID: PMC10192133 DOI: 10.1002/cbic.202200706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 03/05/2023] [Accepted: 03/09/2023] [Indexed: 03/10/2023]
Abstract
Protein tyrosine phosphatases (PTPs) are an important class of enzymes that modulate essential cellular processes through protein dephosphorylation and are dysregulated in various disease states. There is demand for new compounds that target the active sites of these enzymes, for use as chemical tools to dissect their biological roles or as leads for the development of new therapeutics. In this study, we explore an array of electrophiles and fragment scaffolds to investigate the required chemical parameters for covalent inhibition of tyrosine phosphatases. Our analysis juxtaposes the intrinsic electrophilicity of these compounds with their potency against several classical PTPs, revealing chemotypes that inhibit tyrosine phosphatases while minimizing excessive, potentially non-specific reactivity. We also assess sequence divergence at key residues in PTPs to explain their differential susceptibility to covalent inhibition. We anticipate that our study will inspire new strategies to develop covalent probes and inhibitors for tyrosine phosphatases.
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Affiliation(s)
- Suk ho Hong
- Department of Chemistry, Columbia University, New York, NY 10027
| | - Sarah Y. Xi
- Department of Chemistry, Columbia University, New York, NY 10027
| | - Andrew C. Johns
- Department of Chemistry, Columbia University, New York, NY 10027
| | - Lauren C. Tang
- Department of Biological Sciences, Columbia University, New York, NY 10027
| | - Allyson Li
- Department of Chemistry, Columbia University, New York, NY 10027
| | - Madeleine N. Hum
- Department of Chemistry, Columbia University, New York, NY 10027
| | | | - Marko Jovanovic
- Department of Biological Sciences, Columbia University, New York, NY 10027
| | - Neel H. Shah
- Department of Chemistry, Columbia University, New York, NY 10027
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3
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Huang CF, Gottardi CJ, Mrksich M. Tyrosine phosphatase activity is restricted by basic charge substituting mutation of substrates. Sci Rep 2022; 12:15095. [PMID: 36064958 PMCID: PMC9445012 DOI: 10.1038/s41598-022-19133-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 08/24/2022] [Indexed: 11/09/2022] Open
Abstract
Phosphorylation controls important cellular signals and its dysregulation leads to disease. While most phospho-regulation studies are focused on kinases, phosphatases are comparatively overlooked. Combining peptide arrays with SAMDI mass spectrometry, we show that tyrosine phosphatase activity is restricted by basic amino acids adjacent to phosphotyrosines. We validate this model using two β-catenin mutants associated with cancer (T653R/K) and a mouse model for intellectual disability (T653K). These mutants introduce a basic residue next to Y654, an established phosphorylation site where modification shifts β-catenin from cell-cell adhesions and towards its essential nuclear role as Wnt-signaling effector. We show that T653-basic mutant β-catenins are less efficiently dephosphorylated by phosphatases, leading to sustained Y654 phosphorylation and elevated Wnt signals, similar to those observed for Y654E phospho-mimic mutant mice. This model rationalizes how basic mutations proximal to phosphotyrosines can restrict counter-regulation by phosphatases, providing new mechanismistic and treatment insights for 6000+ potentially relevant cancer mutations.
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Affiliation(s)
- Che-Fan Huang
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
| | - Cara J Gottardi
- Division of Pulmonary and Critical Care, Department of Medicine, Northwestern University, Chicago, IL, 60611, USA.
- Biochemistry and Molecular Genetics, Northwestern University, Chicago, IL, 60611, USA.
| | - Milan Mrksich
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA.
- Department of Cell & Developmental Biology, Northwestern University, Chicago, IL, 60611, USA.
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4
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McKenna SM, Fay EM, McGouran JF. Flipping the Switch: Innovations in Inducible Probes for Protein Profiling. ACS Chem Biol 2021; 16:2719-2730. [PMID: 34779621 PMCID: PMC8689647 DOI: 10.1021/acschembio.1c00572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
![]()
Over the past two
decades, activity-based probes have enabled a
range of discoveries, including the characterization of new enzymes
and drug targets. However, their suitability in some labeling experiments
can be limited by nonspecific reactivity, poor membrane permeability,
or high toxicity. One method for overcoming these issues is through
the development of “inducible” activity-based probes.
These probes are added to samples in an unreactive state and require in situ transformation to their active form before labeling
can occur. In this Review, we discuss a variety of approaches to inducible
activity-based probe design, different means of probe activation,
and the advancements that have resulted from these applications. Additionally,
we highlight recent developments which may provide opportunities for
future inducible activity-based probe innovations.
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Affiliation(s)
- Sean M. McKenna
- School of Chemistry and Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse St, Dublin 2, Ireland
- Synthesis and Solid State Pharmaceutical Centre (SSPC), Bernal Institute, Limerick V94 T9PX, Ireland
| | - Ellen M. Fay
- School of Chemistry and Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse St, Dublin 2, Ireland
| | - Joanna F. McGouran
- School of Chemistry and Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse St, Dublin 2, Ireland
- Synthesis and Solid State Pharmaceutical Centre (SSPC), Bernal Institute, Limerick V94 T9PX, Ireland
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5
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Casey GR, Stains CI. A fluorescent probe for monitoring PTP-PEST enzymatic activity. Analyst 2020; 145:6713-6718. [PMID: 32812952 DOI: 10.1039/d0an00993h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Phosphatase non-receptor type 12 (PTPN12 or PTP-PEST) is a critical regulator of cell migration, acting as a tumor suppressor in cancer. Decreases in PTP-PEST expression correlate with aggressive phenotypes in hepatocellular carcinoma (HCC). Despite the importance of PTP-PEST in cellular signaling, methods to directly monitor its enzymatic activity are lacking. Herein, we report the design, synthesis, and optimization of a probe to directly monitor PTP-PEST enzymatic activity via a fluorescent readout. This activity sensor, termed pPEST1tide, is capable of detecting as little as 0.2 nM recombinant PTP-PEST. In addition, we demonstrate that this probe can selectively report on PTP-PEST activity using a panel of potential off-target enzymes. In the long-term, this activity probe could be utilized to identify small molecule modulators of PTP-PEST activity as well as provide a prognostic readout for HCC.
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Affiliation(s)
- Garrett R Casey
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE 68588, USA.
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6
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McCullough BS, Barrios AM. Fluorogenic probes for imaging cellular phosphatase activity. Curr Opin Chem Biol 2020; 57:34-40. [PMID: 32470893 PMCID: PMC7483602 DOI: 10.1016/j.cbpa.2020.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 02/26/2020] [Accepted: 04/08/2020] [Indexed: 11/23/2022]
Abstract
The ability to visualize enzyme activity in a cell, tissue, or living organism can greatly enhance our understanding of the biological roles of that enzyme. While many aspects of cellular signaling are controlled by reversible protein phosphorylation, our understanding of the biological roles of the protein phosphatases involved is limited. Here, we provide an overview of progress toward the development of fluorescent probes that can be used to visualize the activity of protein phosphatases. Significant advances include the development of probes with visible and near-infrared (near-IR) excitation and emission profiles, which provides greater tissue and whole-animal imaging capabilities. In addition, the development of peptide-based probes has provided some selectivity for a phosphatase of interest. Key challenges involve the difficulty of achieving sufficient selectivity for an individual member of a phosphatase enzyme family and the necessity of fully validating the best probes before they can be adopted widely.
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Affiliation(s)
- Brandon S McCullough
- Department of Medicinal Chemistry, University of Utah College of Pharmacy, Salt Lake City, UT 84112-0581, USA
| | - Amy M Barrios
- Department of Medicinal Chemistry, University of Utah College of Pharmacy, Salt Lake City, UT 84112-0581, USA.
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7
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Lee J, Kim S, Kim TH, Lee SH. A ratiometric fluorescence sensor based on enzymatically activatable micellization of TPE derivatives for quantitative detection of alkaline phosphatase activity in serum. RSC Adv 2020; 10:26888-26894. [PMID: 35515761 PMCID: PMC9055494 DOI: 10.1039/d0ra03584j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 07/09/2020] [Indexed: 01/03/2023] Open
Abstract
A novel ratiometric fluorescence assay via enzymatically activatable micellization in aqueous solution was devised for quantitative detection of alkaline phosphatase (ALP) activity. We demonstrated that the dephosphorylation of the water-soluble, phosphate-functionalized, fluorophore monomer P-TPE-TG, induced by an enzymatic reaction of ALP, leads to micelle formation in aqueous solution because its water-soluble functionality is reduced. The dephosphorylation-induced micellization of P-TPE-TG exhibited a ratiometric sensing response for various ALP concentrations (10–200 mU mL−1) and provided a suitable sensing platform for naked eye detection with increased fluorescence quantum yield (Φ = 3.2%), even compared to a typical TPE-based sensor (Φ = 1.0%), where ALP can be sensed with a detection limit of 0.034 mU mL−1. In addition, P-TPE-TG displayed excellent sensing performance at concentrations from 0 to 50 mU mL−1 in diluted human serum (10%), which offers the capability to exploit ratiometric responses for bioactive substances under practical conditions. A novel ratiometric fluorescence assay via enzymatically activatable micellization in aqueous solution was devised for quantitative detection of alkaline phosphatase (ALP) activity.![]()
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Affiliation(s)
- Jeongmoo Lee
- Department of Chemistry
- Daegu University
- Gyeongsan 38453
- Republic of Korea
- Institute of Natural Sciences
| | - Seoyun Kim
- Department of Chemistry
- Daegu University
- Gyeongsan 38453
- Republic of Korea
- Institute of Natural Sciences
| | - Tae Hoon Kim
- Department of Food Science and Biotechnology
- Daegu University
- Gyeongsan 38453
- Republic of Korea
| | - Seoung Ho Lee
- Department of Chemistry
- Daegu University
- Gyeongsan 38453
- Republic of Korea
- Institute of Natural Sciences
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8
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Beck JR, Cabral F, Rasineni K, Casey CA, Harris EN, Stains CI. A Panel of Protein Kinase Chemosensors Distinguishes Different Types of Fatty Liver Disease. Biochemistry 2019; 58:3911-3917. [PMID: 31433166 DOI: 10.1021/acs.biochem.9b00547] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The worldwide incidence of fatty liver disease continues to rise, which may account for concurrent increases in the frequencies of more aggressive liver ailments. Given the existence of histologically identical fatty liver disease subtypes, there is a critical need for the identification of methods that can classify disease and potentially predict progression. Herein, we show that a panel of protein kinase chemosensors can distinguish fatty liver disease subtypes. These direct activity measurements highlight distinct differences between histologically identical fatty liver diseases arising from diets rich in fat versus alcohol and identify a previously unreported decrease in p38α activity associated with a high-fat diet. In addition, we have profiled kinase activities in both benign (diet-induced) and progressive (STAM) disease models. These experiments provide temporal insights into kinase activity during disease development and progression. Altogether, this work provides the basis for the future development of clinical diagnostics and potential treatment strategies.
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Affiliation(s)
- Jon R Beck
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States
| | - Fatima Cabral
- Department of Biochemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States
| | - Karuna Rasineni
- Division of Gastroenterology-Hepatology , University of Nebraska Medical Center , Omaha , Nebraska 68198 , United States.,Research Service, Veterans' Affairs , Nebraska-Western Iowa Health Care System , Omaha , Nebraska 68105 , United States
| | - Carol A Casey
- Division of Gastroenterology-Hepatology , University of Nebraska Medical Center , Omaha , Nebraska 68198 , United States.,Research Service, Veterans' Affairs , Nebraska-Western Iowa Health Care System , Omaha , Nebraska 68105 , United States.,Nebraska Center for Integrated Biomolecular Communication , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States
| | - Edward N Harris
- Department of Biochemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Nebraska Center for Integrated Biomolecular Communication , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Cancer Genes and Molecular Regulation Program, Fred & Pamela Buffet Cancer Center , University of Nebraska Medical Center , Omaha , Nebraska 68198 , United States
| | - Cliff I Stains
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Nebraska Center for Integrated Biomolecular Communication , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Cancer Genes and Molecular Regulation Program, Fred & Pamela Buffet Cancer Center , University of Nebraska Medical Center , Omaha , Nebraska 68198 , United States.,Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States
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9
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Fang Y, Good GN, Zhou X, Stains CI. Phosphinate-containing rhodol and fluorescein scaffolds for the development of bioprobes. Chem Commun (Camb) 2019; 55:5962-5965. [PMID: 31050345 DOI: 10.1039/c9cc02492a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A series of phosphinate-containing rhodol and fluorescein dyes are disclosed. These new fluorophores increase the color palette of phosphinate-based xanthenes in the far-red spectral region. The new chemical functionality of these scaffolds is leveraged to produce a sensitive, no-wash imaging probe for cellular esterase activity. The reported phosphinate-containing dyes provide platforms for the further development of imaging probes and self-reporting delivery vehicles.
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Affiliation(s)
- Yuan Fang
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Gillian N Good
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA. and Department of Chemistry, Millersville University, Millersville, Pennsylvania 17551, USA
| | - Xinqi Zhou
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Cliff I Stains
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA. and Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, NE 68588, USA and Cancer Genes and Molecular Regulation Program, Fred & Pamela Buffet Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
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10
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Choi Y, Shin SH, Jung H, Kwon O, Seo JK, Kee JM. Specific Fluorescent Probe for Protein Histidine Phosphatase Activity. ACS Sens 2019; 4:1055-1062. [PMID: 30912641 DOI: 10.1021/acssensors.9b00242] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Protein histidine phosphorylation plays a vital role in cell signaling and metabolic processes, and phosphohistidine (pHis) phosphatases such as protein histidine phosphatase 1 (PHPT1) and LHPP have been linked to cancer and diabetes, making them novel drug targets and biomarkers. Unlike the case for other classes of phosphatases, further studies of PHPT1 and other pHis phosphatases have been hampered by the lack of specific activity assays in complex biological mixtures. Previous methods relying on radiolabeling are hazardous and technically laborious, and small-molecule phosphatase probes are not selective toward pHis phosphatases. To address these issues, we herein report a fluorescent probe based on chelation-enhanced fluorescence (CHEF) to continuously measure the pHis phosphatase activity of PHPT1. Our probe exhibited excellent sensitivity and specificity toward PHPT1, enabling the first specific measurement of PHPT1 activity in cell lysates. Using this probe, we also obtained more physiologically relevant kinetic parameters of PHPT1, overcoming the limitations of previously used methods.
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11
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Casey GR, Beck JR, Stains CI. Design and synthesis of fluorescent activity probes for protein phosphatases. Methods Enzymol 2019; 622:29-53. [PMID: 31155057 DOI: 10.1016/bs.mie.2019.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Protein phosphatases act in concert with protein kinases to regulate and maintain the phosphoproteome. However, the catalog of chemical tools to directly monitor the enzymatic activity of phosphatases has lagged behind their kinase counterparts. In this chapter, we provide protocols for repurposing the phosphorylation-sensitive sulfonamido-oxine fluorophore known as Sox to afford direct activity probes for phosphatases. With validated activity probes in-hand, inhibitor screens can be conducted with recombinant enzyme and the role of phosphatases in cell signaling can be investigated in unfractionated cell lysates.
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Affiliation(s)
- Garrett R Casey
- Department of Chemistry and Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Jon R Beck
- Department of Chemistry and Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Cliff I Stains
- Department of Chemistry and Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, NE, United States; Cancer Genes and Molecular Recognition Program, Fred & Pamela Buffet Cancer Center, University of Nebraska Medical Center, Omaha, NE, United States.
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12
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Lin M, Huang J, Zeng F, Wu S. A Fluorescent Probe with Aggregation‐Induced Emission for Detecting Alkaline Phosphatase and Cell Imaging. Chem Asian J 2018; 14:802-808. [DOI: 10.1002/asia.201801540] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 11/13/2018] [Indexed: 12/26/2022]
Affiliation(s)
- Mingang Lin
- State Key Laboratory of Luminescent Materials&DevicesCollege of Materials Science&EngineeringSouth China University of Technology Guangzhou 510640 China
| | - Jing Huang
- State Key Laboratory of Luminescent Materials&DevicesCollege of Materials Science&EngineeringSouth China University of Technology Guangzhou 510640 China
| | - Fang Zeng
- State Key Laboratory of Luminescent Materials&DevicesCollege of Materials Science&EngineeringSouth China University of Technology Guangzhou 510640 China
| | - Shuizhu Wu
- State Key Laboratory of Luminescent Materials&DevicesCollege of Materials Science&EngineeringSouth China University of Technology Guangzhou 510640 China
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13
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Durgannavar T, Kwon SJ, Ghisaidoobe ABT, Rho K, Kim JH, Yoon S, Kang HJ, Chung SJ. Label‐Free Detection of Protein Tyrosine Phosphatase 1B (PTP1B) by Using a Rationally Designed Förster Resonance Energy Transfer (FRET) Probe. Chembiochem 2018; 19:2495-2501. [DOI: 10.1002/cbic.201800529] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Indexed: 01/10/2023]
Affiliation(s)
| | - Se Jeong Kwon
- School of PharmacySungkyunkwan University Suwon 16419 Republic of Korea
| | | | - Kyungmin Rho
- Department of ChemistryDongguk University Seoul 100–715 Republic of Korea
| | - Ju Hwan Kim
- Department of ChemistryDongguk University Seoul 100–715 Republic of Korea
| | - Sun‐Young Yoon
- School of PharmacySungkyunkwan University Suwon 16419 Republic of Korea
| | - Hyo Jin Kang
- Department of ChemistryDongguk University Seoul 100–715 Republic of Korea
| | - Sang J. Chung
- School of PharmacySungkyunkwan University Suwon 16419 Republic of Korea
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