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Santos E, Chandra I, Assar Z, Sheng W, Ghanbarpour A, Bingham C, Vasileiou C, Geiger JH, Borhan B. Regulation of Absorption and Emission in a Protein/Fluorophore Complex. ACS Chem Biol 2024; 19:1725-1732. [PMID: 39046136 PMCID: PMC11334107 DOI: 10.1021/acschembio.4c00125] [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: 02/22/2024] [Revised: 07/05/2024] [Accepted: 07/15/2024] [Indexed: 07/25/2024]
Abstract
Human cellular retinol binding protein II (hCRBPII) was used as a protein engineering platform to rationally regulate absorptive and emissive properties of a covalently bound fluorogenic dye. We demonstrate the binding of a thio-dapoxyl analog via formation of a protonated imine between an active site lysine residue and the chromophore's aldehyde. Rational manipulation of the electrostatics of the binding pocket results in a 204 nm shift in absorption and a 131 nm shift in emission. The protein is readily expressed in mammalian systems and binds with exogenously delivered fluorophore as demonstrated by live-cell imaging experiments.
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Affiliation(s)
| | - Ishita Chandra
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Zahra Assar
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Wei Sheng
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Alireza Ghanbarpour
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Courtney Bingham
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Chrysoula Vasileiou
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - James H. Geiger
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Babak Borhan
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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2
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Mehl BP, Vairaprakash P, Li L, Hinde E, MacNevin CJ, Hsu CW, Gratton E, Liu B, Hahn KM. Live-cell biosensors based on the fluorescence lifetime of environment-sensing dyes. CELL REPORTS METHODS 2024; 4:100734. [PMID: 38503289 PMCID: PMC10985238 DOI: 10.1016/j.crmeth.2024.100734] [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: 02/03/2022] [Revised: 03/13/2023] [Accepted: 02/26/2024] [Indexed: 03/21/2024]
Abstract
In this work, we examine the use of environment-sensitive fluorescent dyes in fluorescence lifetime imaging microscopy (FLIM) biosensors. We screened merocyanine dyes to find an optimal combination of environment-induced lifetime changes, photostability, and brightness at wavelengths suitable for live-cell imaging. FLIM was used to monitor a biosensor reporting conformational changes of endogenous Cdc42 in living cells. The ability to quantify activity using phasor analysis of a single fluorophore (e.g., rather than ratio imaging) eliminated potential artifacts. We leveraged these properties to determine specific concentrations of activated Cdc42 across the cell.
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Affiliation(s)
- Brian P Mehl
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Pothiappan Vairaprakash
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Li Li
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Elizabeth Hinde
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California at Irvine, Irvine, CA 92617, USA
| | - Christopher J MacNevin
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Chia-Wen Hsu
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California at Irvine, Irvine, CA 92617, USA
| | - Bei Liu
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Klaus M Hahn
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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3
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Wang X, Jiang C, Wang Z, Cohen BE, Chan EM, Chen G. Triplet-Induced Singlet Oxygen Photobleaches Near-Infrared Dye-Sensitized Upconversion Nanosystems. NANO LETTERS 2023; 23:7001-7007. [PMID: 37493432 DOI: 10.1021/acs.nanolett.3c01671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
The rapid photobleaching of near-infrared (NIR) dye-sensitized upconversion nanosystems is one of the crucial problems that has blocked their technological applications. Uncovering the photophysical and photochemical pathways of NIR dyes would help to elucidate the photobleaching mechanism and thereby improve the photostability of the system. Here we investigate the triplet dynamics of NIR dyes and their interaction with triplet oxygen in the typically investigated IR806-sensitized upconversion nanoparticle (UCNP) nanosystem. Low-temperature fluorescence at 77 K provides direct proof of the generation of singlet oxygen (1O2) under 808 nm laser irradiation. Mass spectrometry indicates that all three double bonds in the structure of IR806 can be broken in the photochemical process. Coupling IR806 to the surface of UCNPs can accelerate its triplet dynamics, thus producing more 1O2 to photocleave IR806. Importantly, we find that the addition of β-carotene can scavenge the generated 1O2, thereby providing a simple method to effectively inhibit photobleaching.
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Affiliation(s)
- Xindong Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering & Key Laboratory of Micro-systems and Micro-structures, Ministry of Education, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Institute of Flexible Electronics Technology of THU, Zhejiang Jiaxing & Key Laboratory of Flexible Electronics based Intelligent Sensing and Advanced Manufacturing Technology, Jiaxing 314006, People's Republic of China
| | - Chang Jiang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering & Key Laboratory of Micro-systems and Micro-structures, Ministry of Education, Harbin Institute of Technology, Harbin 150001, People's Republic of China
| | - Zeming Wang
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Bruce E Cohen
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Division of Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Emory M Chan
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Guanying Chen
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering & Key Laboratory of Micro-systems and Micro-structures, Ministry of Education, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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4
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Yulong B, Wang W, Yanan H, Jichun W, Lihua L, Biao J, Junlin C, Xin Z, Yu L. Tailoring the positive and negative solvatochromism for chalcone analogues to detect heterozygous protein co-aggregation. Chem Commun (Camb) 2023; 59:4016-4019. [PMID: 36916442 DOI: 10.1039/d3cc00545c] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
It is rare for one fluorophore scaffold to harbor both positive and negative solvatochromism. Herein, we tailor chalcone analogues to achieve both positive- and negative-polarity sensitivity of fluorescence intensity. We explore two chalcones of opposite solvatochromism to simultaneously detect the co-aggregation of wild-type and mutant superoxide dismutase that cause amyotrophic lateral sclerosis disease.
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Affiliation(s)
- Bai Yulong
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China. .,University of Chinese Academy of Sciences, Beijing 100049, China.,Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China.
| | - Wan Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| | - Huang Yanan
- Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China. .,Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Wu Jichun
- Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China. .,Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Liu Lihua
- Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China. .,Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Jing Biao
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China. .,The Second Hospital of Dalian Medical University, Dalian, China
| | - Chen Junlin
- Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China. .,Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Zhang Xin
- Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China. .,Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Liu Yu
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
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5
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Zhang Y, Tang H, Chen W, Zhang J. Nanomaterials Used in Fluorescence Polarization Based Biosensors. Int J Mol Sci 2022; 23:8625. [PMID: 35955779 PMCID: PMC9369394 DOI: 10.3390/ijms23158625] [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: 06/29/2022] [Revised: 07/29/2022] [Accepted: 08/01/2022] [Indexed: 11/17/2022] Open
Abstract
Fluorescence polarization (FP) has been applied in detecting chemicals and biomolecules for early-stage diagnosis, food safety analyses, and environmental monitoring. Compared to organic dyes, inorganic nanomaterials such as quantum dots have special fluorescence properties that can enhance the photostability of FP-based biosensing. In addition, nanomaterials, such as metallic nanoparticles, can be used as signal amplifiers to increase fluorescence polarization. In this review paper, different types of nanomaterials used in in FP-based biosensors have been reviewed. The role of each type of nanomaterial, acting as a fluorescent element and/or the signal amplifier, has been discussed. In addition, the advantages of FP-based biosensing systems have been discussed and compared with other fluorescence-based techniques. The integration of nanomaterials and FP techniques allows biosensors to quickly detect analytes in a sensitive and cost-effective manner and positively impact a variety of different fields including early-stage diagnoses.
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Affiliation(s)
- Yingqi Zhang
- Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada; (Y.Z.); (W.C.)
| | - Howyn Tang
- School of Biomedical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada;
| | - Wei Chen
- Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada; (Y.Z.); (W.C.)
| | - Jin Zhang
- Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada; (Y.Z.); (W.C.)
- School of Biomedical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada;
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6
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Mohale M, Gundampati RK, Krishnaswamy Suresh Kumar T, Heyes CD. Site-specific labeling and functional efficiencies of human fibroblast growth Factor-1 with a range of fluorescent Dyes in the flexible N-Terminal region and a rigid β-turn region. Anal Biochem 2022; 640:114524. [PMID: 34933004 DOI: 10.1016/j.ab.2021.114524] [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: 11/10/2021] [Accepted: 12/08/2021] [Indexed: 11/01/2022]
Abstract
Human fibroblast growth factor-1 (hFGF1) binding to its receptor and heparin play critical roles in cell proliferation, angiogenesis and wound healing but is also implicated in cancer. Fluorescence imaging is a powerful approach to study such protein interactions, but it is not always obvious if the site chosen will be efficiently labeled, often relying on trial-and-error. To provide a more systematic approach towards an efficient site-specific labeling strategy, we labeled two structurally distinct regions of the protein - the flexible N-terminus and a rigid loop. Several dyes were chosen to cover the visible region and to investigate how the structure of the dye affects the labeling efficiency. Flexibility in either the protein labeling site or the dye structure was found to result in high labeling efficiency, but flexibility in both resulted in a significant decrease in labeling efficiency. Conversely, too much rigidity in both can result in dye-protein interactions that can aggregate the protein. Importantly, site-specifically labeling hFGF1 in these regions maintained biological activity. These results could be applicable to other proteins by considering the flexibility of both the protein labeling site and the dye structure.
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Affiliation(s)
- Mamello Mohale
- Department of Chemistry and Biochemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR, 72701, USA
| | - Ravi Kumar Gundampati
- Department of Chemistry and Biochemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR, 72701, USA
| | | | - Colin D Heyes
- Department of Chemistry and Biochemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR, 72701, USA.
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7
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Bai Y, Huang Y, Wan W, Jin W, Shen D, Lyu H, Zeng L, Liu Y. Derivatizing merocyanine dyes to balance their polarity and viscosity sensitivities for protein aggregation detection. Chem Commun (Camb) 2021; 57:13313-13316. [PMID: 34812440 DOI: 10.1039/d1cc05200d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Protein misfolding and aggregation processes involve local polarity and viscosity fluctuation. Herein we modulated the polarity and viscosity sensitivities of merocyanine dyes to detect protein aggregation. We demonstrated how structural modulation balanced these two fluorescence sensitivities and affected the detection of misfolded and aggregated proteins.
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Affiliation(s)
- Yulong Bai
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanan Huang
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Wang Wan
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Wenhan Jin
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Di Shen
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Haochen Lyu
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Lianggang Zeng
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Yu Liu
- CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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8
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Huang PJ, Kumarasamy K, Devendhiran T, Chen YC, Dong TY, Lin MC. BODIPY-based hydroxypyridyl derivative as a highly Ni2+-selective fluorescent chemosensor. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Weinstain R, Slanina T, Kand D, Klán P. Visible-to-NIR-Light Activated Release: From Small Molecules to Nanomaterials. Chem Rev 2020; 120:13135-13272. [PMID: 33125209 PMCID: PMC7833475 DOI: 10.1021/acs.chemrev.0c00663] [Citation(s) in RCA: 271] [Impact Index Per Article: 67.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Indexed: 02/08/2023]
Abstract
Photoactivatable (alternatively, photoremovable, photoreleasable, or photocleavable) protecting groups (PPGs), also known as caged or photocaged compounds, are used to enable non-invasive spatiotemporal photochemical control over the release of species of interest. Recent years have seen the development of PPGs activatable by biologically and chemically benign visible and near-infrared (NIR) light. These long-wavelength-absorbing moieties expand the applicability of this powerful method and its accessibility to non-specialist users. This review comprehensively covers organic and transition metal-containing photoactivatable compounds (complexes) that absorb in the visible- and NIR-range to release various leaving groups and gasotransmitters (carbon monoxide, nitric oxide, and hydrogen sulfide). The text also covers visible- and NIR-light-induced photosensitized release using molecular sensitizers, quantum dots, and upconversion and second-harmonic nanoparticles, as well as release via photodynamic (photooxygenation by singlet oxygen) and photothermal effects. Release from photoactivatable polymers, micelles, vesicles, and photoswitches, along with the related emerging field of photopharmacology, is discussed at the end of the review.
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Affiliation(s)
- Roy Weinstain
- School
of Plant Sciences and Food Security, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Tomáš Slanina
- Institute
of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 166 10 Prague, Czech Republic
| | - Dnyaneshwar Kand
- School
of Plant Sciences and Food Security, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Petr Klán
- Department
of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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10
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Li Z, Huang B, Wang Y, Yuan W, Wu Y, Yu R, Xing G, Zou T, Tao Y. Design, synthesis and application in biological imaging of a novel red fluorescent dye based on a rhodanine derivative. RSC Adv 2020; 11:160-163. [PMID: 35423009 PMCID: PMC8690906 DOI: 10.1039/d0ra08998b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 12/10/2020] [Indexed: 01/23/2023] Open
Abstract
A novel acceptor–donor–acceptor type molecule, namely 2-triphenylamine-1,3-dia[2-(3-ethyl-4-oxo-thiazolidin-2-ylidene)-malononitrile] (2RDNTPA), is designed and synthesized. 2RDNTPA exhibits a large Stokes shift of 244 nm and red fluorescence emission of 629 nm with a decent photoluminescence quantum yield of 13%. Furthermore, as a potential red fluorescent dye, 2RDNTPA can be applied in fluorescence imaging of living cancer cells (HepG2) with negligible cytotoxicity and a half maximal inhibitory concentration much more than 100 μM. 2RDNTPA can be applied in fluorescence imaging of living cancer cells (HepG2) with red emission of 620 nm and negligible cytotoxicity with a half maximal inhibitory concentration much more than 100 μM.![]()
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Affiliation(s)
- Zijing Li
- Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University Nanjing P. R. China
| | - Bin Huang
- College of Life Sciences and Chemistry, Jiangsu Key Laboratory of Biofunctional Molecule, Jiangsu Second Normal University Nanjing P. R. China
| | - Yuan Wang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University Guangzhou P. R. China
| | - Wenbo Yuan
- Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University Nanjing P. R. China
| | - Yijing Wu
- Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University Nanjing P. R. China
| | - Ruitao Yu
- Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University Nanjing P. R. China
| | - Guichuan Xing
- Institute of Applied Physics and Materials Engineering, University of Macau Macao SAR 999078 China
| | - Taotao Zou
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University Guangzhou P. R. China
| | - Youtian Tao
- Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University Nanjing P. R. China
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11
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Marzano NR, Wray KM, Johnston CL, Paudel BP, Hong Y, van Oijen A, Ecroyd H. An α-Cyanostilbene Derivative for the Enhanced Detection and Imaging of Amyloid Fibril Aggregates. ACS Chem Neurosci 2020; 11:4191-4202. [PMID: 33226775 DOI: 10.1021/acschemneuro.0c00478] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The aggregation of proteins into amyloid fibrils has been implicated in the pathogenesis of a variety of neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease. Benzothiazole dyes such as Thioflavin T (ThT) are well-characterized and widely used fluorescent probes for monitoring amyloid fibril formation. However, existing dyes lack sensitivity and specificity to oligomeric intermediates formed during fibril formation. In this work, we describe the use of an α-cyanostilbene derivative (called ASCP) with aggregation-induced emission properties as a fluorescent probe for the detection of amyloid fibrils. Similar to ThT, ASCP is fluorogenic in the presence of amyloid fibrils and, upon binding and excitation at 460 nm, produces a red-shifted emission with a large Stokes shift of 145 nm. ASCP has a higher binding affinity to fibrillar α-synuclein than ThT and likely shares the same binding sites to amyloid fibrils. Importantly, ASCP was found to also be fluorogenic in the presence of amorphous aggregates and can detect oligomeric species formed early during aggregation. Moreover, ASCP can be used to visualize fibrils via total internal reflection fluorescence microscopy and, due to its large Stokes shift, simultaneously monitor the fluorescence emission of other labelled proteins following excitation with the same laser used to excite ASCP. Consequently, ASCP possesses enhanced and unique spectral characteristics compared to ThT that make it a promising alternative for the in vitro study of amyloid fibrils and the mechanisms by which they form.
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Affiliation(s)
- Nicholas R. Marzano
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Kelly M. Wray
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Caitlin L. Johnston
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Bishnu P. Paudel
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Yuning Hong
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Antoine van Oijen
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Heath Ecroyd
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
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12
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Kim KS, Suzuki K, Cho H, Bae YH. Selected Factors Affecting Oral Bioavailability of Nanoparticles Surface-Conjugated with Glycocholic Acid via Intestinal Lymphatic Pathway. Mol Pharm 2020; 17:4346-4353. [PMID: 33064945 DOI: 10.1021/acs.molpharmaceut.0c00764] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Here, we describe the absorption pathways of nanoparticles whose surface is modified with bile acid and present environmental factors that influence oral bioavailability (BA) from the gastrointestinal tract (GIT). The approach utilized 100 nm sized fluorescence-labeled, carboxylated polystyrene nanoparticles (CPN) conjugated with glycocholic acid (G/CPN) to exclude potential artifacts, if existing, and instability issues in evaluating the transit of G/CPN in the GIT and measuring BA. The in vitro study using SK-BR-3 that expresses the apical sodium bile acid transporter showed that once G/CPN is internalized, it stayed 2.9 times longer in the cells than CPN, indirectly suggesting that G/CPN takes intracellular trafficking pathways different from CPN in SK-BR-3 cells. In a Caco-2 cell monolayer, G/CPN passed through the monolayer without damaging the tight junction. G/CPN, when administered orally in rodents, showed sustained transit time in the GIT for at least 4 h and was absorbed into the intestinal lymphatic system and circulated into the blood. Ingestion of food before and after oral administration delays G/CPN absorption and decreases BA. A decrease in gastrointestinal motility by anesthetic condition increased the relative BA of G/CPN by up to 74%. Thus, the oral BA of G/CPN can be optimized by taking food ingestion and gastrointestinal motility into account.
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Affiliation(s)
- Kyoung Sub Kim
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Kenichi Suzuki
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.,Fuji Research Laboratories, Pharmaceutical Division, Kowa Company Limited, 332-1 Ohnoshinden, Fuji, Shizuoka 417-8650, Japan
| | - Hana Cho
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - You Han Bae
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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13
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Chou CH, Wu CY, Chen CL, Zhou JQ, Kao YC, Chen HY, Lin PC. In vivo monitoring of carbonic anhydrase expression during the growth of larval zebrafish: a new environment-sensitive fluorophore for responsive turn-on fluorescence. Chem Commun (Camb) 2020; 56:11307-11310. [PMID: 32840276 DOI: 10.1039/d0cc03090b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study monitors the dynamic progress of a newly developed background-free, target responsive strategy; 2,3-dihydroquinolin-4-imine (DQI) that can instantly respond to environmental changes with fluorescence enhancement, revealing a comprehensive platform for in vivo fluorescence bioimaging of mebrane-bound carbonic anhydrase II in HeLa cells and its expression during the growth of larval zebrafish.
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Affiliation(s)
- Chih-Hung Chou
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
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14
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Mills B, Megia-Fernandez A, Norberg D, Duncan S, Marshall A, Akram AR, Quinn T, Young I, Bruce AM, Scholefield E, Williams GOS, Krstajić N, Choudhary TR, Parker HE, Tanner MG, Harrington K, Wood HAC, Birks TA, Knight JC, Haslett C, Dhaliwal K, Bradley M, Ucuncu M, Stone JM. Molecular detection of Gram-positive bacteria in the human lung through an optical fiber-based endoscope. Eur J Nucl Med Mol Imaging 2020; 48:800-807. [PMID: 32915268 PMCID: PMC7485201 DOI: 10.1007/s00259-020-05021-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 08/31/2020] [Indexed: 12/13/2022]
Abstract
Purpose The relentless rise in antimicrobial resistance is a major societal challenge and requires, as part of its solution, a better understanding of bacterial colonization and infection. To facilitate this, we developed a highly efficient no-wash red optical molecular imaging agent that enables the rapid, selective, and specific visualization of Gram-positive bacteria through a bespoke optical fiber–based delivery/imaging endoscopic device. Methods We rationally designed a no-wash, red, Gram-positive-specific molecular imaging agent (Merocy-Van) based on vancomycin and an environmental merocyanine dye. We demonstrated the specificity and utility of the imaging agent in escalating in vitro and ex vivo whole human lung models (n = 3), utilizing a bespoke fiber–based delivery and imaging device, coupled to a wide-field, two-color endomicroscopy system. Results The imaging agent (Merocy-Van) was specific to Gram-positive bacteria and enabled no-wash imaging of S. aureus within the alveolar space of whole ex vivo human lungs within 60 s of delivery into the field-of-view, using the novel imaging/delivery endomicroscopy device. Conclusion This platform enables the rapid and specific detection of Gram-positive bacteria in the human lung. Electronic supplementary material The online version of this article (10.1007/s00259-020-05021-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bethany Mills
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.
| | - Alicia Megia-Fernandez
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Dominic Norberg
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Sheelagh Duncan
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Adam Marshall
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Ahsan R Akram
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Thomas Quinn
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Irene Young
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Annya M Bruce
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Emma Scholefield
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Gareth O S Williams
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Nikola Krstajić
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Tushar R Choudhary
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.,The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, UK
| | - Helen E Parker
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.,Department of Applied Physics, Royal Institute of Technology, KTH, SE-106 91, Stockholm, Sweden
| | - Michael G Tanner
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.,Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - Kerrianne Harrington
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, UK
| | - Harry A C Wood
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, UK
| | - Timothy A Birks
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, UK
| | - Jonathan C Knight
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, UK
| | - Christopher Haslett
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Kevin Dhaliwal
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Mark Bradley
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Muhammed Ucuncu
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK. .,Department of Analytical Chemistry, Faculty of Pharmacy, Izmir Katip Celebi University, Izmir, Turkey.
| | - James M Stone
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, BA2 7AY, UK.
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15
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Krawczyk P, Bratkowska M, Wybranowski T, Hołyńska-Iwan I, Cysewski P, Jędrzejewska B. Experimental and theoretical insight into spectroscopic properties and bioactivity of 4-(4-formylbenzylidene)-2-phenyloxazol-5(4H)-one dye for future applications in biochemistry. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113632] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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16
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Matikonda SS, Ivanic J, Gomez M, Hammersley G, Schnermann MJ. Core remodeling leads to long wavelength fluoro-coumarins. Chem Sci 2020; 11:7302-7307. [PMID: 34123014 PMCID: PMC8159424 DOI: 10.1039/d0sc02566f] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Low molecular weight, uncharged far-red and NIR dyes would be enabling for a range of imaging applications. Rational redesign of the coumarin scaffold leads to Fluoro-Coumarins (FCs), the lowest molecular weight dyes with emission maxima beyond 700, 800, and 900 nm. FCs display large Stokes shifts and high environmental sensitivity, with a 40-fold increase in emission intensity in hydrophobic solvents. Untargeted variants exhibit selective lipid droplet and nuclear staining in live cells. Furthermore, sulfo-lipid derivatization enables active targeting to the plasma membrane. Overall, these studies report a promising platform for the development of biocompatible, context-responsive imaging agents. Fluoro-Coumarins are a novel class of far-red and near-infrared solvent sensitive dyes of exceptionally low molecular weight.![]()
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Affiliation(s)
- Siddharth S Matikonda
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health Frederick Maryland 21702 USA
| | - Joseph Ivanic
- Advanced Biomedical Computational Science, Frederick National Laboratory for Cancer Research Frederick Maryland 21702 USA
| | - Miguel Gomez
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health Frederick Maryland 21702 USA
| | - Gabrielle Hammersley
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health Frederick Maryland 21702 USA
| | - Martin J Schnermann
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health Frederick Maryland 21702 USA
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17
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Liu XR, Zhang MM, Gross ML. Mass Spectrometry-Based Protein Footprinting for Higher-Order Structure Analysis: Fundamentals and Applications. Chem Rev 2020; 120:4355-4454. [PMID: 32319757 PMCID: PMC7531764 DOI: 10.1021/acs.chemrev.9b00815] [Citation(s) in RCA: 130] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Proteins adopt different higher-order structures (HOS) to enable their unique biological functions. Understanding the complexities of protein higher-order structures and dynamics requires integrated approaches, where mass spectrometry (MS) is now positioned to play a key role. One of those approaches is protein footprinting. Although the initial demonstration of footprinting was for the HOS determination of protein/nucleic acid binding, the concept was later adapted to MS-based protein HOS analysis, through which different covalent labeling approaches "mark" the solvent accessible surface area (SASA) of proteins to reflect protein HOS. Hydrogen-deuterium exchange (HDX), where deuterium in D2O replaces hydrogen of the backbone amides, is the most common example of footprinting. Its advantage is that the footprint reflects SASA and hydrogen bonding, whereas one drawback is the labeling is reversible. Another example of footprinting is slow irreversible labeling of functional groups on amino acid side chains by targeted reagents with high specificity, probing structural changes at selected sites. A third footprinting approach is by reactions with fast, irreversible labeling species that are highly reactive and footprint broadly several amino acid residue side chains on the time scale of submilliseconds. All of these covalent labeling approaches combine to constitute a problem-solving toolbox that enables mass spectrometry as a valuable tool for HOS elucidation. As there has been a growing need for MS-based protein footprinting in both academia and industry owing to its high throughput capability, prompt availability, and high spatial resolution, we present a summary of the history, descriptions, principles, mechanisms, and applications of these covalent labeling approaches. Moreover, their applications are highlighted according to the biological questions they can answer. This review is intended as a tutorial for MS-based protein HOS elucidation and as a reference for investigators seeking a MS-based tool to address structural questions in protein science.
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Affiliation(s)
| | | | - Michael L. Gross
- Department of Chemistry, Washington University in St. Louis, St. Louis, MO, USA, 63130
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18
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Baibek A, Üçüncü M, Blackburn EA, Bradley M, Lilienkampf A. Wash‐free
,
peptide‐based
fluorogenic probes for microbial imaging. Pept Sci (Hoboken) 2020. [DOI: 10.1002/pep2.24167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Assel Baibek
- EaStCHEM School of Chemistry Joseph Black Building, University of Edinburgh Edinburgh UK
| | - Muhammed Üçüncü
- EaStCHEM School of Chemistry Joseph Black Building, University of Edinburgh Edinburgh UK
| | - Elizabeth A. Blackburn
- The Wellcome Centre for Cell Biology Michael Swann Building, University of Edinburgh Edinburgh UK
| | - Mark Bradley
- EaStCHEM School of Chemistry Joseph Black Building, University of Edinburgh Edinburgh UK
| | - Annamaria Lilienkampf
- EaStCHEM School of Chemistry Joseph Black Building, University of Edinburgh Edinburgh UK
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19
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Bu F, Zhao B, Kan W, Ding L, Liu T, Wang L, Song B, Wang W, Deng Q. An ESIPT characteristic “turn-on” fluorescence sensor for Hg2+ with large Stokes shift and sequential “turn-off” detection of S2– as well as the application in living cells. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112165] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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20
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Das A. Experimental and Theoretical Studies on Molecular Structures, Nanostructural Features, and Photophysical Properties of 5-Amino-1-Alkylimidazole-4-Carboxamide Compounds. J STRUCT CHEM+ 2019. [DOI: 10.1134/s0022476619060143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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MacNevin CJ, Watanabe T, Weitzman M, Gulyani A, Fuehrer S, Pinkin NK, Tian X, Liu F, Jin J, Hahn KM. Membrane-Permeant, Environment-Sensitive Dyes Generate Biosensors within Living Cells. J Am Chem Soc 2019; 141:7275-7282. [PMID: 30994345 DOI: 10.1021/jacs.8b09841] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Dyes with environment-sensitive fluorescence have proven useful to study the spatiotemporal dynamics of protein activity in living cells. When attached to proteins, their fluorescence can reflect protein conformational changes, post-translational modifications, or protein interactions. However, the utility of such dye-protein conjugates has been limited because it is difficult to load them into cells. They usually must be introduced using techniques that perturb cell physiology, limit throughput, or generate fluorescent vesicles (e.g., electroporation, microinjection, or membrane transduction peptides). Here we circumvent these problems by modifying a proven, environment-sensitive biosensor fluorophore so that it can pass through cell membranes without staining intracellular compartments and can be attached to proteins within living cells using unnatural amino acid (UAA) mutagenesis. Reactive groups were incorporated for attachment to UAAs or small molecules (mero166, azide; mero167, alkyne; mero76, carboxylic acid). These dyes are bright and fluoresce at long wavelengths (reaching ε = 100 000 M-1 cm-1, ϕ = 0.24, with excitation 565 nm and emission 594 nm). The utility of mero166 was demonstrated by in-cell labeling of a UAA to generate a biosensor for the small GTPase Cdc42. In addition, conjugation of mero166 to a small molecule produced a membrane-permeable probe that reported the localization of the DNA methyltransferase G9a in cells. This approach provides a strategy to access biosensors for many targets and to more practically harness the varied environmental sensitivities of synthetic dyes.
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Affiliation(s)
- Christopher J MacNevin
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Takashi Watanabe
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Matthew Weitzman
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Akash Gulyani
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Sheryl Fuehrer
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Nicholas K Pinkin
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Xu Tian
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Feng Liu
- Center for Integrative Chemical Biology and Drug Discovery, School of Pharmacy , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Jian Jin
- Center for Integrative Chemical Biology and Drug Discovery, School of Pharmacy , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Klaus M Hahn
- Department of Pharmacology, School of Medicine , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
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22
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Matsubara R, Kaiba T, Nakata A, Yabuta T, Hayashi M, Tsubaki M, Uchino T, Chatani E. 9-Aryl-3-aminocarbazole as an Environment- and Stimuli-Sensitive Fluorogen and Applications in Lipid Droplet Imaging. J Org Chem 2019; 84:5535-5547. [DOI: 10.1021/acs.joc.9b00493] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ryosuke Matsubara
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Tomoaki Kaiba
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Akito Nakata
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Tatsushi Yabuta
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Masahiko Hayashi
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Motonari Tsubaki
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Takashi Uchino
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
| | - Eri Chatani
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
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23
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Wang L, Lin W, Sun W, Yan M, Zhao J, Guan L, Deng W, Zhang Y. Meso-Substituent-Directed Aggregation Behavior and Water Solubility: Direct Functionalization of Methine Chain in Thiazole Orange and Biological Applications in Aqueous Buffer. J Org Chem 2019; 84:3960-3967. [PMID: 30834752 DOI: 10.1021/acs.joc.8b03122] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new strategy is presented to preclude aggregation and enhance water solubility of cyanine dyes. Namely, a heteroatom-containing substituent, for distorting molecular plane and increasing interaction with water molecules, is introduced to the methine chain of 2-thiazole orange (1, a monocyanine) via one-step, and 2-thiazole orange derivatives 2a-g are prepared accordingly. The X-ray crystal structures show that the molecular plane of 2a-g is drastically twisted, which reduces intermolecular π-π stacking. The derivatives 2a-g exhibit good to excellent water solubility and can be dissolved in aqueous phosphate-buffered saline (PBS) at concentrations suitable for biomedical applications. No aggregation in aqueous PBS, relatively high molar extinction coefficients, and low solvatochromism of 2a-g are reflected by the UV-vis spectra. Compound 2b shows fast response and high selectivity for biothiols (Cys, Hcy, and GSH) in aqueous PBS and is further employed to detect endogenous biothiols with decent biocompatibility as demonstrated by live cell fluorescence imaging.
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Affiliation(s)
- Lanying Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Wenxia Lin
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Wei Sun
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Mengqi Yan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Junlong Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Li Guan
- School of Science , Xi'an University of Architecture and Technology , Xi'an 710055 , P.R. China
| | - Wenting Deng
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
| | - Yongqiang Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710127 , P.R. China
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24
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Yamamoto T, Caldwell DR, Gandioso A, Schnermann MJ. A Cyanine Photooxidation/β-Elimination Sequence Enables Near-infrared Uncaging of Aryl Amine Payloads. Photochem Photobiol 2019; 95:951-958. [PMID: 30701558 DOI: 10.1111/php.13090] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 01/24/2019] [Indexed: 02/06/2023]
Abstract
Uncaging strategies that use near-infrared wavelengths can enable the highly targeted delivery of biomolecules in complex settings. Many methods, including an approach we developed using cyanine photooxidation, are limited to phenol-containing payloads. Given the critical role of amines in diverse biological processes, we sought to use cyanine photooxidation to initiate the release of aryl amines. Heptamethine cyanines substituted with an aryl amine at the C4' position undergo only inefficient release, likely due electronic factors. We then pursued the hypothesis that the carbonyl products derived from cyanine photooxidation could undergo efficient β-elimination. After examining both symmetrical and unsymmetrical scaffolds, we identify a merocyanine substituted with indolenine and coumarin heterocycles that undergoes efficient photooxidation and aniline uncaging. In total, these studies provide a new scheme-cyanine photooxidation followed by β-elimination-through which to design photocages with efficient uncaging properties.
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Affiliation(s)
- Tsuyoshi Yamamoto
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD
| | - Donald R Caldwell
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD
| | - Albert Gandioso
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD.,Seccio de Química Orgànica, Departament de Química Inorganica i Organica, Universitat de Barcelona, Barcelona, Spain
| | - Martin J Schnermann
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD
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25
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Enhancement of photostability and fluorescence quantum yield of DXP in solid state by using mixed solvent. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.12.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Affiliation(s)
- Zijuan Hai
- Hefei National Laboratory of Physical Sciences at Microscale; Department of Chemistry; University of Science and Technology of China; 96 Jinzhai Road Hefei Anhui 230026 China
| | - Gaolin Liang
- Hefei National Laboratory of Physical Sciences at Microscale; Department of Chemistry; University of Science and Technology of China; 96 Jinzhai Road Hefei Anhui 230026 China
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27
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Wu C, Lu Q, Miu X, Fang A, Li H, Zhang Y. A simple assay platform for sensitive detection of Sudan I-IV in chilli powder based on CsPbBr 3 quantum dots. Journal of Food Science and Technology 2018; 55:2497-2503. [PMID: 30042565 DOI: 10.1007/s13197-018-3167-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 10/23/2017] [Accepted: 04/09/2018] [Indexed: 10/17/2022]
Abstract
Sudan dyes are phenyl-azoic derivatives widely used in industry. Classified as carcinogenic and are strictly forbidden in foodstuffs; however, some unscrupulous businessmen adopted it for coloring foodstuffs. Here, a simple and effective fluorescence (FL) assay platform has been developed for the detection of Sudan I-IV based on CsPbBr3 perovskite quantum dots (QDs). It was found that the fluorescent emission of CsPbBr3 QDs can be effectively quenched by Sudan I-IV. Under the optimized conditions, the FL quenching efficiency of CsPbBr3 QDs was quantitatively correlated to the logarithmic concentrations of Sudan I-IV over the ranges of 100-10,000, 0.1-1000, 0.1-2000 and 0.4-1000 ng mL-1 for Sudan I-IV, and the corresponding limits of detection were 3.33, 0.03, 0.03 and 0.04 ng mL-1 (at 3σ/slope), respectively. CsPbX3 QDs (X = Cl, Br, and I or mixed halide systems Cl/Br and Br/I) was utilized as sensor in FL assay, which have unique optical properties of high FL quantum yields (up to 90%), narrow half peak width (26 nm) and tunable FL emissions spectra (410-700 nm). Meanwhile, the practical use of this assay platform for Sudan I-IV detection in chilli powder samples was also demonstrated, which indicated the potential in practical applications.
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Affiliation(s)
- Cuiyan Wu
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China.,2National and Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
| | - Qiujun Lu
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
| | - Xuran Miu
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
| | - Aijin Fang
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
| | - Haitao Li
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
| | - Youyu Zhang
- 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081 People's Republic of China
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28
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Chen HJ, Chew CY, Chang EH, Tu YW, Wei LY, Wu BH, Chen CH, Yang YT, Huang SC, Chen JK, Chen IC, Tan KT. S-Cis Diene Conformation: A New Bathochromic Shift Strategy for Near-Infrared Fluorescence Switchable Dye and the Imaging Applications. J Am Chem Soc 2018; 140:5224-5234. [DOI: 10.1021/jacs.8b01159] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | | | | | | | | | - Chien-Hung Chen
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan (ROC)
| | - Ya-Ting Yang
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan (ROC)
| | - Su-Chin Huang
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan (ROC)
| | - Jen-Kun Chen
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan (ROC)
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29
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Liu Y, Miao K, Li Y, Fares M, Chen S, Zhang X. A HaloTag-Based Multicolor Fluorogenic Sensor Visualizes and Quantifies Proteome Stress in Live Cells Using Solvatochromic and Molecular Rotor-Based Fluorophores. Biochemistry 2018; 57:4663-4674. [DOI: 10.1021/acs.biochem.8b00135] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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30
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Liu T, Gao Y, Zhang X, Wan Y, Du L, Fang H, Li M. Discovery of a Turn-On Fluorescent Probe for Myeloid Cell Leukemia-1 Protein. Anal Chem 2017; 89:11173-11177. [DOI: 10.1021/acs.analchem.7b01148] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Tingting Liu
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Yuqi Gao
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Xiaomeng Zhang
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Yichao Wan
- Key
Laboratory of Theoretical Organic Chemistry and Functional Molecule
(MOE), College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Lupei Du
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Hao Fang
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Minyong Li
- Department
of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE),
School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
- State
Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong 250100, China
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31
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Yu C, Miao W, Wang J, Hao E, Jiao L. PyrrolylBODIPYs: Syntheses, Properties, and Application as Environment-Sensitive Fluorescence Probes. ACS OMEGA 2017; 2:3551-3561. [PMID: 31457674 PMCID: PMC6641347 DOI: 10.1021/acsomega.7b00444] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 06/28/2017] [Indexed: 05/26/2023]
Abstract
Four pyrrole B-ring-functionalized pyrrolylBODIPYs and their B-ring unsubstituted analogues were synthesized from easily accessible starting 5-halo-2-formylpyrroles and were characterized by nuclear magnetic resonance, high-resolution mass spectrometry, X-ray analysis, and optical/electronic properties. In great contrast to the substitution(s) at the other two pyrrolic units, electron-donating substituent(s) at pyrrole B-ring bring significant blue shift of the absorption and emission bands. Cyclic voltammetry and density functional theory calculations indicate that this blue shift may be attributed to the increased highest occupied molecular orbital and the lowest unoccupied molecular orbital energy levels and the overall increase in the energy band gaps. These pyrrolylBODIPYs generally show intense absorption (centered at 570-624 nm) and fluorescence emission (582-654 nm) in nonpolar solvents. A gradual decrease in the fluorescence intensity was observed for these dyes with the increase in solvent dipolar moment, which combines with the red to far-red absorption/emission, rendering these pyrrolylBODIPYs potential applications as environment-sensitive fluorescence probes as demonstrated in this work for bovine serum albumin.
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32
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Control of astrocyte morphology by Rho GTPases. Brain Res Bull 2017; 136:44-53. [PMID: 28502648 DOI: 10.1016/j.brainresbull.2017.05.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 05/05/2017] [Accepted: 05/10/2017] [Indexed: 12/15/2022]
Abstract
Astrocytes modulate and support neuronal and synapse function via numerous mechanisms that often rely on diffusion of signalling molecules, ions or metabolites through extracellular space. As a consequence, the spatial arrangement and the distance between astrocyte processes and neuronal structures are of functional importance. Likewise, changes of astrocyte structure will affect the ability of astrocytes to interact with neurons. In contrast to neurons, where rapid morphology changes are critically involved in many aspects of physiological brain function, a role of astrocyte restructuring in brain physiology is only beginning to emerge. In neurons, small GTPases of the Rho family are powerful initiators and modulators of structural changes. Less is known about the functional significance of these signalling molecules in astrocytes. Here, we review recent experimental evidence for the role of RhoA, Cdc42 and Rac1 in controlling dynamic astrocyte morphology as well as experimental tools and analytical approaches for studying astrocyte morphology changes.
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33
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Nani R, Gorka AP, Nagaya T, Yamamoto T, Ivanic J, Kobayashi H, Schnermann MJ. In Vivo Activation of Duocarmycin-Antibody Conjugates by Near-Infrared Light. ACS CENTRAL SCIENCE 2017; 3:329-337. [PMID: 28470051 PMCID: PMC5408340 DOI: 10.1021/acscentsci.7b00026] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Indexed: 05/03/2023]
Abstract
Near-IR photocaging groups based on the heptamethine cyanine scaffold present the opportunity to visualize and then treat diseased tissue with potent bioactive molecules. Here we describe fundamental chemical studies that enable biological validation of this approach. Guided by rational design, including computational analysis, we characterize the impact of structural alterations on the cyanine uncaging reaction. A modest change to the ethylenediamine linker (N,N'-dimethyl to N,N'-diethyl) leads to a bathochromic shift in the absorbance maxima, while decreasing background hydrolysis. Building on these structure-function relationship studies, we prepare antibody conjugates that uncage a derivative of duocarmycin, a potent cytotoxic natural product. The optimal conjugate, CyEt-Pan-Duo, undergoes small molecule release with 780 nm light, exhibits activity in the picomolar range, and demonstrates excellent light-to-dark selectivity. Mouse xenograft studies illustrate that the construct can be imaged in vivo prior to uncaging with an external laser source. Significant reduction in tumor burden is observed following a single dose of conjugate and near-IR light. These studies define key chemical principles that enable the identification of cyanine-based photocages with enhanced properties for in vivo drug delivery.
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Affiliation(s)
- Roger
R. Nani
- Chemical
Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Alexander P. Gorka
- Chemical
Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Tadanobu Nagaya
- Molecular
Imaging Program, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20850, United States
| | - Tsuyoshi Yamamoto
- Chemical
Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Joseph Ivanic
- Advanced
Biomedical Computing Center, DSITP, Frederick National Laboratory
for Cancer Research, Leidos Biomedical Research,
Inc., Frederick, Maryland 21702, United
States
| | - Hisataka Kobayashi
- Molecular
Imaging Program, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20850, United States
| | - Martin J. Schnermann
- Chemical
Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
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34
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Hubin EA, Fay A, Xu C, Bean JM, Saecker RM, Glickman MS, Darst SA, Campbell EA. Structure and function of the mycobacterial transcription initiation complex with the essential regulator RbpA. eLife 2017; 6. [PMID: 28067618 PMCID: PMC5302886 DOI: 10.7554/elife.22520] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 01/07/2017] [Indexed: 02/07/2023] Open
Abstract
RbpA and CarD are essential transcription regulators in mycobacteria. Mechanistic analyses of promoter open complex (RPo) formation establish that RbpA and CarD cooperatively stimulate formation of an intermediate (RP2) leading to RPo; formation of RP2 is likely a bottleneck step at the majority of mycobacterial promoters. Once RPo forms, CarD also disfavors its isomerization back to RP2. We determined a 2.76 Å-resolution crystal structure of a mycobacterial transcription initiation complex (TIC) with RbpA as well as a CarD/RbpA/TIC model. Both CarD and RbpA bind near the upstream edge of the −10 element where they likely facilitate DNA bending and impede transcription bubble collapse. In vivo studies demonstrate the essential role of RbpA, show the effects of RbpA truncations on transcription and cell physiology, and indicate additional functions for RbpA not evident in vitro. This work provides a framework to understand the control of mycobacterial transcription by RbpA and CarD. DOI:http://dx.doi.org/10.7554/eLife.22520.001
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Affiliation(s)
| | - Allison Fay
- Immunology Program, Sloan-Kettering Institute, New York, United States
| | - Catherine Xu
- The Rockefeller University, New York, United States
| | - James M Bean
- Immunology Program, Sloan-Kettering Institute, New York, United States
| | | | - Michael S Glickman
- Immunology Program, Sloan-Kettering Institute, New York, United States.,Division of Infectious Diseases, Memorial Sloan-Kettering Cancer Center, New York, United States
| | - Seth A Darst
- The Rockefeller University, New York, United States
| | | |
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35
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Li J, Zhu Z, Rong S, Li H, Guo Y, Xue Q, Ding D. A specific environment-sensitive near-infrared fluorescent turn-on probe for synergistic enhancement of anticancer activity of a chemo-drug. Biomater Sci 2017; 5:1622-1628. [DOI: 10.1039/c7bm00270j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A near-infrared fluorescent turn-on probe has been reported for specific HER2 imaging and synergistic enhancement of anticancer activity of doxorubicin.
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Affiliation(s)
- Jun Li
- State Key Laboratory of Medicinal Chemical Biology
- Key Laboratory of Bioactive Materials
- Ministry of Education
- and College of Life Sciences
- Nankai University
| | - Zhipeng Zhu
- State Key Laboratory of Medicinal Chemical Biology
- Key Laboratory of Bioactive Materials
- Ministry of Education
- and College of Life Sciences
- Nankai University
| | - Shaoqin Rong
- State Key Laboratory of Medicinal Chemical Biology
- Key Laboratory of Bioactive Materials
- Ministry of Education
- and College of Life Sciences
- Nankai University
| | - Heran Li
- State Key Laboratory of Medicinal Chemical Biology
- Key Laboratory of Bioactive Materials
- Ministry of Education
- and College of Life Sciences
- Nankai University
| | - Yuenan Guo
- Tianjin Medical University Cancer Institute and Hospital
- National Clinical Research Center for Cancer
- Tianjin's Clinical Research Center for Cancer
- and Key Laboratory of Cancer Prevention and Therapy
- Tianjin
| | - Qiang Xue
- Tianjin Medical University Cancer Institute and Hospital
- National Clinical Research Center for Cancer
- Tianjin's Clinical Research Center for Cancer
- and Key Laboratory of Cancer Prevention and Therapy
- Tianjin
| | - Dan Ding
- State Key Laboratory of Medicinal Chemical Biology
- Key Laboratory of Bioactive Materials
- Ministry of Education
- and College of Life Sciences
- Nankai University
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36
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Nordhaus MA, Krongauz VV, Hai TT. Synthesis of solvatochromic merocyanine dyes and their immobilization to polymers. J Appl Polym Sci 2016. [DOI: 10.1002/app.44451] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mark A. Nordhaus
- Medical Products Division; Baxter Healthcare Corporation; 25212 West Illinois Rt. 120 Round Lake Illinois 60073
| | - Vadim V. Krongauz
- Medical Products Division; Baxter Healthcare Corporation; 25212 West Illinois Rt. 120 Round Lake Illinois 60073
| | - Ton That Hai
- Medical Products Division; Baxter Healthcare Corporation; 25212 West Illinois Rt. 120 Round Lake Illinois 60073
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37
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Clear KJ, Virga K, Gray L, Smith BD. Using membrane composition to fine-tune the p Ka of an optical liposome pH sensor. JOURNAL OF MATERIALS CHEMISTRY. C 2016; 4:2925-2930. [PMID: 27087967 PMCID: PMC4830428 DOI: 10.1039/c5tc03480a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Liposomes containing membrane-anchored pH-sensitive optical probes are valuable sensors for monitoring pH in various biomedical samples. The dynamic range of the sensor is maximized when the probe pKa is close to the expected sample pH. While some biomedical samples are close to neutral pH there are several circumstances where the pH is 1 or 2 units lower. Thus, there is a need to fine-tune the probe pKa in a predictable way. This investigation examined two lipid-conjugated optical probes, each with appended deep-red cyanine dyes containing indoline nitrogen atoms that are protonated in acid. The presence of anionic phospholipids in the liposomes stabilized the protonated probes and increased the probe pKa values by < 1 unit. The results show that rational modification of the membrane composition is a general non-covalent way to fine-tune the pKa of an optical liposome sensor for optimal pH sensing performance.
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38
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Far-red/near-infrared fluorescence light-up probes for specific in vitro and in vivo imaging of a tumour-related protein. Sci Rep 2016; 6:23190. [PMID: 26984064 PMCID: PMC4794726 DOI: 10.1038/srep23190] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 02/29/2016] [Indexed: 01/07/2023] Open
Abstract
As lysosomal protein transmembrane 4 beta (LAPTM4B) is an important biomarker for many solid tumours, development of small-molecule fluorescence light-up probes for detection and imaging of LAPTM4B proteins is particularly valuable. In this work, we reported the design and synthesis of a far-red/near-infrared (FR/NIR) fluorescence light-up probe DBT-2EEGIHGHHIISVG, which could specifically visualize LAPTM4B proteins in cancer cells and tumour-bearing live mice. DBT-2EEGIHGHHIISVG was synthesized by the conjugation of two LAPTM4B-binding peptide ligands (EEGIHGHHIISVG) with one environment-sensitive fluorogen, 4,7-di(thiophen-2-yl)-2,1,3-benzothiadiazole (DBT). Owing to the intramolecular charge transfer character of DBT, DBT-2EEGIHGHHIISVG is weakly emissive in aqueous solution, but switches to fluoresce upon LAPTM4B proteins specifically bind to the peptide ligand of the probe, which provide the DBT with hydrophobic microenvironment, greatly reducing its charge transfer effect with water. It is found that DBT-2EEGIHGHHIISVG can achieve targeted imaging of LAPTM4B proteins in HepG2 cancer cells and visualize LAPTM4B protein-expressed tumour tissues of live mice in a selective and high-contrast manner.
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39
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MacNevin CJ, Toutchkine A, Marston DJ, Hsu CW, Tsygankov D, Li L, Liu B, Qi T, Nguyen DV, Hahn KM. Ratiometric Imaging Using a Single Dye Enables Simultaneous Visualization of Rac1 and Cdc42 Activation. J Am Chem Soc 2016; 138:2571-5. [PMID: 26863024 DOI: 10.1021/jacs.5b09764] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biosensors that report endogenous protein activity in vivo can be based on environment-sensing fluorescent dyes. The dyes can be attached to reagents that bind selectively to a specific conformation of the targeted protein, such that binding leads to a fluorescence change. Dyes that are sufficiently bright for use at low, nonperturbing intracellular concentrations typically undergo changes in intensity rather than the shifts in excitation or emission maxima that would enable precise quantitation through ratiometric imaging. We report here mero199, an environment-sensing dye that undergoes a 33 nm solvent-dependent shift in excitation. The dye was used to generate a ratiometric biosensor of Cdc42 (CRIB199) without the need for additional fluorophores. CRIB199 was used in the same cell with a FRET sensor of Rac1 activation to simultaneously observe Cdc42 and Rac1 activity in cellular protrusions, indicating that Rac1 but not Cdc42 activity was reduced during tail retraction, and specific protrusions had reduced Cdc42 activity. A novel program (EdgeProps) used to correlate localized activation with cell edge dynamics indicated that Rac1 was specifically reduced during retraction.
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Affiliation(s)
- Christopher J MacNevin
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Alexei Toutchkine
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Daniel J Marston
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Chia-Wen Hsu
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Denis Tsygankov
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Li Li
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Bei Liu
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Timothy Qi
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Dan-Vinh Nguyen
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Klaus M Hahn
- Department of Pharmacology, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
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40
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Liu Z, Jiang T, Wang B, Ke B, Zhou Y, Du L, Li M. Environment-Sensitive Fluorescent Probe for the Human Ether-a-go-go-Related Gene Potassium Channel. Anal Chem 2016; 88:1511-5. [PMID: 26730746 PMCID: PMC4741275 DOI: 10.1021/acs.analchem.5b04220] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
![]()
A novel
environment-sensitive probe S2 with turn-on switch for
Human Ether-a-go-go-Related Gene (hERG) potassium channel was developed
herein. After careful evaluation, this fluorescent probe showed high
binding affinity with hERG potassium channel with an IC50 value of 41.65 nM and can be well applied to hERG channel imaging
or cellular distribution study for hERG channel blockers. Compared
with other imaging techniques, such as immunofluorescence and fluorescent
protein-based approaches, this method is convenient and affordable,
especially since a washing procedure is not needed. Meanwhile, this
environment-sensitive turn-on design strategy may provide a good example
for the probe development for these targets that have no reactive
or catalytic activity.
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Affiliation(s)
- Zhenzhen Liu
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Tianyu Jiang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Beilei Wang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Bowen Ke
- Laboratory of Anaesthesiology and Critical Care Medicine, West China Hospital, Sichuan University , Chengdu, Sichuan 610041, China
| | - Yubin Zhou
- Institute of Biosciences and Technology, Texas A&M University Health Science Center , Houston, Texas 77030, United States
| | - Lupei Du
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Minyong Li
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
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41
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Nani RR, Kelley JA, Ivanic J, Schnermann MJ. Reactive Species Involved in the Regioselective Photooxidation of Heptamethine Cyanines. Chem Sci 2015; 6:6556-6563. [PMID: 26508998 PMCID: PMC4618397 DOI: 10.1039/c5sc02396c] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 08/06/2015] [Indexed: 12/27/2022] Open
Abstract
Heptamethine cyanines are important near-IR fluorophores used in many fluorescence applications. Despite this utility, these molecules are susceptible to light-promoted reactions (photobleaching) involving photochemically generated reactive oxygen species (ROS). Here, we have sought to define key chemical aspects of this nearly inescapable process. Near-IR photolysis of a model heptamethine cyanine leads to the regioselective oxidative cleavage of the cyanine polyene. We report the first quantitative analysis of the major reaction pathway following either photolysis or exposure to candidate ROS. These studies clearly indicate that only singlet oxygen (1O2), and not other feasible ROS, recapitulates the direct photolysis pathway. Computational studies were employed to investigate the regioselectivity of the oxidative cleavage process, and the theoretical ratio is comparable to observed experimental values. These results provide a more complete picture of heptamethine cyanine photooxidation, and provide insight for design of improved compounds for future applications.
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Affiliation(s)
- Roger R. Nani
- Chemical Biology Laboratory
, Center for Cancer Research
, National Cancer Institute at Frederick
,
Frederick
, Maryland 21702
, USA
.
| | - James A. Kelley
- Chemical Biology Laboratory
, Center for Cancer Research
, National Cancer Institute at Frederick
,
Frederick
, Maryland 21702
, USA
.
| | - Joseph Ivanic
- Advanced Biomedical Computing Center
, DSITP
, Frederick National Laboratory for Cancer Research
,
Frederick
, Maryland 21702
, USA
.
| | - Martin J. Schnermann
- Chemical Biology Laboratory
, Center for Cancer Research
, National Cancer Institute at Frederick
,
Frederick
, Maryland 21702
, USA
.
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42
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Helma J, Cardoso MC, Muyldermans S, Leonhardt H. Nanobodies and recombinant binders in cell biology. J Cell Biol 2015; 209:633-44. [PMID: 26056137 PMCID: PMC4460151 DOI: 10.1083/jcb.201409074] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Antibodies are key reagents to investigate cellular processes. The development of recombinant antibodies and binders derived from natural protein scaffolds has expanded traditional applications, such as immunofluorescence, binding arrays, and immunoprecipitation. In addition, their small size and high stability in ectopic environments have enabled their use in all areas of cell research, including structural biology, advanced microscopy, and intracellular expression. Understanding these novel reagents as genetic modules that can be integrated into cellular pathways opens up a broad experimental spectrum to monitor and manipulate cellular processes.
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Affiliation(s)
- Jonas Helma
- Department of Biology II, Ludwig Maximilians University Munich and Center for Integrated Protein Science Munich, 82152 Planegg-Martinsried, Germany
| | - M Cristina Cardoso
- Department of Biology, Technical University of Darmstadt, 64287 Darmstadt, Germany
| | - Serge Muyldermans
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Heinrich Leonhardt
- Department of Biology II, Ludwig Maximilians University Munich and Center for Integrated Protein Science Munich, 82152 Planegg-Martinsried, Germany
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43
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Gorka AP, Nani RR, Schnermann MJ. Cyanine polyene reactivity: scope and biomedical applications. Org Biomol Chem 2015; 13:7584-98. [PMID: 26052876 PMCID: PMC7780248 DOI: 10.1039/c5ob00788g] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Cyanines are indispensable fluorophores that form the chemical basis of many fluorescence-based applications. A feature that distinguishes cyanines from other common fluorophores is an exposed polyene linker that is both crucial to absorption and emission and subject to covalent reactions that dramatically alter these optical properties. Over the past decade, reactions involving the cyanine polyene have been used as foundational elements for a range of biomedical techniques. These include the optical sensing of biological analytes, super-resolution imaging, and near-IR light-initiated uncaging. This review surveys the chemical reactivity of the cyanine polyene and the biomedical methods enabled by these reactions. The overarching goal is to highlight the multifaceted nature of cyanine chemistry and biology, as well as to point out the key role of reactivity-based insights in this promising area.
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Affiliation(s)
- Alexander P Gorka
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.
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44
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Donnelly SK, Bravo-Cordero JJ, Hodgson L. Rho GTPase isoforms in cell motility: Don't fret, we have FRET. Cell Adh Migr 2015; 8:526-34. [PMID: 25482645 PMCID: PMC4594258 DOI: 10.4161/cam.29712] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The Rho-family of p21 small GTPases are directly linked to the regulation of actin-based motile machinery and play a key role in the control of cell migration. Aside from the original and most well-characterized canonical Rho GTPases RhoA, Rac1, and Cdc42, numerous isoforms of these key proteins have been identified and shown to have specific roles in regulating various cellular motility processes. The major difficulty in addressing these isoform-specific effects is that isoforms typically contain highly similar primary amino acid sequences and thus are able to interact with the same upstream regulators and the downstream effector targets. Here, we will introduce the major members of each GTPase subfamily and discuss recent advances in the design and application of fluorescent resonance energy transfer-based probes, which are at the forefront of the technologies available to directly probe the differential, spatiotemporal activation dynamics of these proteins in live single cells. Currently, it is possible to specifically detect the activation status of RhoA vs. RhoC isoforms, as well as Cdc42 vs. TC-10 isoforms in living cells. Clearly, additional efforts are still required to produce biosensor systems capable of detecting other isoforms of Rho GTPases including RhoB, Rac2/3, RhoG, etc. Through such efforts, we will uncover the isoform-specific roles of these near-identical proteins in living cells, clearly an important area of the Rho GTPase biology that is not yet fully appreciated.
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Affiliation(s)
- Sara K Donnelly
- a Department of Anatomy and Structural Biology ; Albert Einstein College of Medicine of Yeshiva University ; Bronx , NY USA
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45
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Chen G, Hua Y, Ou C, Zhang X, Mao D, Yang Z, Ding D, Chen M. Nanostructure formation-induced fluorescence turn-on for selectively detecting protein thiols in solutions, bacteria and live cells. Chem Commun (Camb) 2015; 51:10758-61. [PMID: 26051694 DOI: 10.1039/c5cc01349f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We report the design and synthesis of a light-up probe of DBT-2(EEGK-maleimide), which can serve as a unique probe for selectively detecting protein thiols in various environments, including aqueous solutions, bacteria and live cells.
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Affiliation(s)
- Guoqin Chen
- Cardiovascular Medicine Department of Guangzhou Panyu Central Hospital, 8 Fuyudonglu Qiaonanjie Panyu District, Guangzhou, P. R. China
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46
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Effective Tuning of Ketocyanine Derivatives through Acceptor Substitution. Chemistry 2015; 21:7721-5. [DOI: 10.1002/chem.201406625] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 03/10/2015] [Indexed: 11/07/2022]
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47
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Jiang N, Fan J, Xu F, Peng X, Mu H, Wang J, Xiong X. Ratiometric Fluorescence Imaging of Cellular Polarity: Decrease in Mitochondrial Polarity in Cancer Cells. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410645] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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48
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Jiang N, Fan J, Xu F, Peng X, Mu H, Wang J, Xiong X. Ratiometric Fluorescence Imaging of Cellular Polarity: Decrease in Mitochondrial Polarity in Cancer Cells. Angew Chem Int Ed Engl 2015; 54:2510-4. [DOI: 10.1002/anie.201410645] [Citation(s) in RCA: 163] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Indexed: 11/11/2022]
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49
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Karpenko IA, Collot M, Richert L, Valencia C, Villa P, Mély Y, Hibert M, Bonnet D, Klymchenko AS. Fluorogenic Squaraine Dimers with Polarity-Sensitive Folding As Bright Far-Red Probes for Background-Free Bioimaging. J Am Chem Soc 2014; 137:405-12. [DOI: 10.1021/ja5111267] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Iuliia A. Karpenko
- Laboratoire
d’Innovation Thérapeutique, UMR 7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74
route du Rhin, 67401 Illkirch, France
| | - Mayeul Collot
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg,
Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Ludovic Richert
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg,
Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Christel Valencia
- Platform
of Integrative Chemical Biology of Strasbourg (PCBIS), FMTS, UMS 3286 CNRS/Université de Strasbourg, ESBS Pôle API, Bld Sébastien Brant, 67401 Illkirch, France
| | - Pascal Villa
- Platform
of Integrative Chemical Biology of Strasbourg (PCBIS), FMTS, UMS 3286 CNRS/Université de Strasbourg, ESBS Pôle API, Bld Sébastien Brant, 67401 Illkirch, France
| | - Yves Mély
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg,
Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Marcel Hibert
- Laboratoire
d’Innovation Thérapeutique, UMR 7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74
route du Rhin, 67401 Illkirch, France
| | - Dominique Bonnet
- Laboratoire
d’Innovation Thérapeutique, UMR 7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74
route du Rhin, 67401 Illkirch, France
| | - Andrey S. Klymchenko
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg,
Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
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50
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Helassa N, Garnett JP, Farrant M, Khan F, Pickup JC, Hahn KM, MacNevin CJ, Tarran R, Baines DL. A novel fluorescent sensor protein for detecting changes in airway surface liquid glucose concentration. Biochem J 2014; 464:213-20. [PMID: 25220254 PMCID: PMC4357280 DOI: 10.1042/bj20141041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Both lung disease and elevation of blood glucose are associated with increased glucose concentration (from 0.4 to ~4.0 mM) in the airway surface liquid (ASL). This perturbation of ASL glucose makes the airway more susceptible to infection by respiratory pathogens. ASL is minute (~1 μl/cm(2)) and the measurement of glucose concentration in the small volume ASL is extremely difficult. Therefore, we sought to develop a fluorescent biosensor with sufficient sensitivity to determine glucose concentrations in ASL in situ. We coupled a range of environmentally sensitive fluorophores to mutated forms of a glucose/galactose-binding protein (GBP) including H152C and H152C/A213R and determined their equilibrium binding properties. Of these, GBP H152C/A213R-BADAN (Kd 0.86 ± 0.01 mM, Fmax/F0 3.6) was optimal for glucose sensing and in ASL increased fluorescence when basolateral glucose concentration was raised from 1 to 20 mM. Moreover, interpolation of the data showed that the glucose concentration in ASL was increased, with results similar to that using glucose oxidase analysis. The fluorescence of GBP H152C/A213R-BADAN in native ASL from human airway epithelial cultures in situ was significantly increased over time when basolateral glucose was increased from 5 to 20 mM. Overall our data indicate that this GBP is a useful tool to monitor glucose homoeostasis in the lung.
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Affiliation(s)
- Nordine Helassa
- Institute of Cardiovascular and Cell Science, St George’s, University of London, London SW17 0RE, U.K
| | - James P. Garnett
- Institute for Infection and Immunity, St George’s, University of London, London SW17 0RE, U.K
| | - Matthew Farrant
- Institute for Infection and Immunity, St George’s, University of London, London SW17 0RE, U.K
| | - Faaizah Khan
- Diabetes Research Group, King’s College London, Guy’s Hospital Campus, London SE1 1UL, U.K
| | - John C. Pickup
- Diabetes Research Group, King’s College London, Guy’s Hospital Campus, London SE1 1UL, U.K
| | - Klaus M. Hahn
- Department of Pharmacology/Cell Biology & Physiology, University of North Carolina, Chapel Hill, NC, 27599 U.S.A
| | - Christopher J. MacNevin
- Department of Pharmacology/Cell Biology & Physiology, University of North Carolina, Chapel Hill, NC, 27599 U.S.A
| | - Robert Tarran
- Department of Pharmacology/Cell Biology & Physiology, University of North Carolina, Chapel Hill, NC, 27599 U.S.A
| | - Deborah L. Baines
- Institute for Infection and Immunity, St George’s, University of London, London SW17 0RE, U.K
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