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Dutta A, Szekely Z, Guven H, Li XP, McLaughlin JE, Tumer NE. A fluorescence anisotropy-based competition assay to identify inhibitors against ricin and Shiga toxin ribosome interactions. Anal Biochem 2024:115580. [PMID: 38825159 DOI: 10.1016/j.ab.2024.115580] [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: 02/27/2024] [Revised: 05/16/2024] [Accepted: 05/24/2024] [Indexed: 06/04/2024]
Abstract
Ricin is one of the most toxic substances known and a type B biothreat agent. Shiga toxins (Stxs) produced by E. coli (STEC) and Shigella dysenteriae are foodborne pathogens. There is no effective therapy against ricin or STEC and there is an urgent need for inhibitors. Ricin toxin A subunit (RTA) and A1 subunit of Stx2a (Stx2A1) bind to the C-terminal domain (CTD) of the ribosomal P-stalk proteins to depurinate the sarcin/ricin loop. Modulation of toxin-ribosome interactions has not been explored as a strategy for inhibition. Therefore, development of assays that detect inhibitors of toxin-ribosome interactions remains a critical need. Here we describe a fluorescence anisotropy (FA)-based competitive binding assay using a BODIPY-TMR labeled 11-mer peptide (P11) derived from the P-stalk CTD to measure the binding affinity of peptides ranging from 3-11 amino acids for the P-stalk pocket of RTA and Stx2A1. Comparison of the affinity with the surface plasmon resonance (SPR) assay indicated that although the rank order was the same by both methods, the FA assay could differentiate better between peptides that show nonspecific interactions by SPR. The FA assay detects only interactions that compete with the labeled P11 and can validate inhibitor specificity and mechanism of action.
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Affiliation(s)
- Arkajyoti Dutta
- Department of Plant Biology, Rutgers, The State University of New Jersey, 59 Dudley Road, New Brunswick, NJ 08901, USA
| | - Zoltan Szekely
- Molecular Design and Synthesis Core, Rutgers University Biomolecular Innovations Cores, Office for Research, Rutgers University, 610 Taylor Rd, Piscataway, NJ, 08854, USA
| | - Hakan Guven
- Molecular Design and Synthesis Core, Rutgers University Biomolecular Innovations Cores, Office for Research, Rutgers University, 610 Taylor Rd, Piscataway, NJ, 08854, USA
| | - Xiao-Ping Li
- Department of Plant Biology, Rutgers, The State University of New Jersey, 59 Dudley Road, New Brunswick, NJ 08901, USA.
| | - John E McLaughlin
- Department of Plant Biology, Rutgers, The State University of New Jersey, 59 Dudley Road, New Brunswick, NJ 08901, USA
| | - Nilgun E Tumer
- Molecular Design and Synthesis Core, Rutgers University Biomolecular Innovations Cores, Office for Research, Rutgers University, 610 Taylor Rd, Piscataway, NJ, 08854, USA.
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Singh A, Dhau J, Kumar R, Badru R, Kaushik A. Exploring the fluorescence properties of tellurium-containing molecules and their advanced applications. Phys Chem Chem Phys 2024; 26:9816-9847. [PMID: 38497121 DOI: 10.1039/d3cp05740b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
This review article explores the fascinating realm of fluorescence using organochalcogen molecules, with a particular emphasis on tellurium (Te). The discussion encompasses the underlying mechanisms, structural motifs influencing fluorescence, and the applications of these intriguing phenomena. This review not only elucidates the current state of knowledge but also identifies avenues for future research, thereby serving as a valuable resource for researchers and enthusiasts in the field of fluorescence chemistry with a focus on Te-based molecules. By highlighting challenges and prospects, this review sparks a conversation on the transformative potential of Te-containing compounds across different fields, ranging from environmental solutions to healthcare and materials science applications. This review aims to provide a comprehensive understanding of the distinct fluorescence behaviors exhibited by Te-containing compounds, contributing valuable insights to the evolving landscape of chalcogen-based fluorescence research.
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Affiliation(s)
- Avtar Singh
- Research and Development, Molekule Group Inc., 3802 Spectrum Blvd., Tampa, Florida 33612, USA.
- Department of Chemistry, Sri Guru Teg Bahadur Khalsa College, Anandpur Sahib, Punjab 140118, India
| | - Jaspreet Dhau
- Research and Development, Molekule Group Inc., 3802 Spectrum Blvd., Tampa, Florida 33612, USA.
| | - Rajeev Kumar
- Department of Environment Studies, Panjab University, Chandigarh 160014, India
| | - Rahul Badru
- Department of Chemistry, Sri Guru Granth Sahib World University, Fatehgarh Sahib, Punjab 140406, India
| | - Ajeet Kaushik
- NanoBioTech Laboratory, Department of Environmental Engineering, Florida Polytechnic University, Lakeland, FL 33805, USA
- School of Engineering, University of Petroleum and Energy Studies (UPES), Dehradun, Uttarakhand, India
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Peng K, Anmangandla A, Jana S, Jin Y, Lin H. Iso-ADP-Ribose Fluorescence Polarization Probe for the Screening of RNF146 WWE Domain Inhibitors. ACS Chem Biol 2024; 19:300-307. [PMID: 38237916 PMCID: PMC10877565 DOI: 10.1021/acschembio.3c00512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/20/2023] [Accepted: 12/20/2023] [Indexed: 02/17/2024]
Abstract
Poly-ADP-ribosylation is an important protein post-translational modification with diverse biological consequences. After binding poly-ADP-ribose on axis inhibition protein 1 (AXIN1) through its WWE domain, RING finger protein 146 (RNF146) can ubiquitinate AXIN1 and promote its proteasomal degradation and thus the oncogenic WNT signaling. Therefore, inhibiting the RNF146 WWE domain is a potential antitumor strategy. However, due to a lack of suitable screening methods, no inhibitors for this domain have been reported. Here, we developed a fluorescence polarization (FP)-based competition assay for the screening of RNF146 WWE inhibitors. This assay relies on a fluorescently tagged iso-ADP-ribose tracer compound, TAMRA-isoADPr. We report the design and synthesis of this tracer compound and show that it is a high-affinity tracer for the RNF146 WWE domain. This provides a convenient assay and will facilitate the development of small-molecule inhibitors for the RNF146 WWE domain.
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Affiliation(s)
- Kewen Peng
- Department
of Chemistry and Chemical Biology, Cornell
University, Ithaca, New York 14853, United States
| | - Ananya Anmangandla
- Department
of Chemistry and Chemical Biology, Cornell
University, Ithaca, New York 14853, United States
| | - Sadhan Jana
- Department
of Chemistry and Chemical Biology, Cornell
University, Ithaca, New York 14853, United States
| | - Yizhen Jin
- Graduate
Program of Biochemistry, Molecular and Cell Biology, Department of
Molecular Biology and Genetics, Cornell
University, Ithaca, New York 14853, United States
| | - Hening Lin
- Howard
Hughes Medical Institute, Department of Chemistry and Chemical Biology,
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853, United States
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Mukhametova LI, Karimova MR, Zharikova OG, Pirogov AV, Levkina VV, Chichkanova ES, Liu L, Xu C, Eremin SA. Detection of Dibutyl Phthalate in Surface Water by Fluorescence Polarization Immunoassay. BIOSENSORS 2023; 13:1005. [PMID: 38131765 PMCID: PMC10741632 DOI: 10.3390/bios13121005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/19/2023] [Accepted: 11/26/2023] [Indexed: 12/23/2023]
Abstract
Dibutyl phthalate (DBP) is widely used as a plasticizer in the production of polymeric materials to give them flexibility, strength and extensibility. However, due to its negative impact on human health, in particular reproductive functions and fetal development, the content of DBP must be controlled in food and the environment. The present study aims to develop a sensitive, fast and simple fluorescence polarization immunoassay (FPIA) using monoclonal antibodies derived against DBP (MAb-DBP) for its detection in open waters. New conjugates of DBP with various fluorescein derivatives were obtained and characterized: 5-aminomethylfluorescein (AMF) and dichlorotriazinylaminofluorescein (DTAF). The advantages of using the DBP-AMF conjugate in the FPIA method are shown, the kinetics of binding of this chemical with antibodies are studied, the analysis is optimized, and the concentration of monoclonal antibodies is selected for sensitivity analysis-16 nM. The calibration dependence of the fluorescence polarization signal for the detection of DBP was obtained. The observed IC50 (DBP concentration at which a 50% decrease in the fluorescence polarization signal occurs, 40 ng/mL) and the limit of detection (LOD, 7.5 ng/mL) values were improved by a factor of 45 over the previously described FPIA using polyclonal antibodies. This technique was tested by the recovery method, and the high percentage of DBP discovery in water ranged from 85 to 110%. Using the developed method, real water samples from Lake Onega were tested, and a good correlation was shown between the results of the determination of DBP by the FPIA method and GC-MS. Thus, the FPIA method developed in this work can be used to determine DBP in open-water reservoirs.
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Affiliation(s)
- Liliya I. Mukhametova
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
- A. N. Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Leninskie Prospect 33, 119071 Moscow, Russia
| | - Madina R. Karimova
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
| | - Olga G. Zharikova
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
| | - Andrey V. Pirogov
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
| | - Valentina V. Levkina
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
| | - Ekaterina S. Chichkanova
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
| | - Liqiang Liu
- School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China (C.X.)
| | - Chuanlai Xu
- School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China (C.X.)
| | - Sergei A. Eremin
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia; (L.I.M.); (O.G.Z.); (A.V.P.); (V.V.L.); (E.S.C.)
- A. N. Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Leninskie Prospect 33, 119071 Moscow, Russia
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