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Yu GN, Huang JC, Li L, Liu RT, Cao JQ, Wu Q, Zhang SY, Wang CX, Mei WJ, Zheng WJ. Preparation of Ru(ii)@oligonucleotide nanosized polymers as potential tumor-imaging luminescent probes. RSC Adv 2018; 8:30573-30581. [PMID: 35546841 PMCID: PMC9085494 DOI: 10.1039/c8ra05454a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 08/15/2018] [Indexed: 01/05/2023] Open
Abstract
The development of Ru(ii) complexes as luminescent probes has attracted increasing attention in recent decades. In this study, the nanosized polymers of two Ru(ii) complexes [Ru(phen)2(dppz)](ClO4)2 (1, phen = 1,10-phenanthrolin; dppz = dipyrido[3,2-a:2′,3′-c]phenazine) and [Ru(phen)2(Br-dppz)](ClO4)2 (2, Br-dppz = 11-bromodipyrido[3,2-a:2′,3′-c]phenazine) with oligonucleotides were prepared and investigated as potential tumor-imaging probes. The formation of the nanosized polymers, which had an average width of 125–438 nm and an average height of 3–6 nm, for 1 and 2@oligonucleotides were observed through atomic force microscopy. The emission spectra indicated that the luminescence of 1 and 2 markedly increased after binding to oligonucleotides and double-strand DNA (calf thymus DNA), respectively. Moreover, further studies indicated that 1@oligonucleotides and 2@oligonucleotides can easily enter into tumor cells and selectively highlight the tumor area in the zebrafish bear xenograft tumor (MDA-MB-231). In summary, this study demonstrated that 1@oligonucleotides and 2@oligonucleotides could be developed as potential tumor-imaging luminescent probes for clinical diagnosis and therapy. Ru(ii)@oligonucleotide nanoparticles can be developed as potential tumor selective tracker and have potential applications of tumor targeting imaging.![]()
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Affiliation(s)
- Geng-Nan Yu
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | - Jun-Chao Huang
- Traditional Chinese Medicine College
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | - Li Li
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | - Ruo-Tong Liu
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | | | - Qiong Wu
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
- School of Chemistry
| | - Shuang-Yan Zhang
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | - Cheng-Xi Wang
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
| | - Wen-Jie Mei
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- China
- Guangdong Province Engineering Technology Centre for Molecular Probe and Biomedicine Imaging
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2
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Zeng ZP, Wu Q, Sun FY, Zheng KD, Mei WJ. Imaging Nuclei of MDA-MB-231 Breast Cancer Cells by Chiral Ruthenium(II) Complex Coordinated by 2-(4-Phenyacetylenephenyl)-1H-imidazo[4,5f][1,10]phenanthroline. Inorg Chem 2016; 55:5710-8. [DOI: 10.1021/acs.inorgchem.6b00824] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Fen-Yong Sun
- Department
of Clinical Laboratory Medicine, Shanghai Tenth People’s Hospital of Tongji University, 301 Yanchang Road, 200072 Shanghai, People’s Republic of China
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De la Cadena A, Pascher T, Davydova D, Akimov D, Herrmann F, Presselt M, Wächtler M, Dietzek B. Intermolecular exciton–exciton annihilation in phospholipid vesicles doped with [Ru(bpy)2dppz]2+. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.11.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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4
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Higgs PL, McKinley AW, Tuite EM. [Ru(phen)2dppz]2+ luminescence reveals nanoscale variation of polarity in the cyclodextrin cavity. Chem Commun (Camb) 2016; 52:1883-6. [DOI: 10.1039/c5cc09755j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Insertion of dppz with phosphorylated β-cyclodextrin results in multi-exponential [Ru(phen)2dppz]2+ emission; binding is weaker than [Ru(phen)3]2+, but shows stereoselectivity.
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Affiliation(s)
- P. L. Higgs
- School of Chemistry
- Newcastle University
- Newcastle upon Tyne
- UK
| | - A. W. McKinley
- Department of Chemistry
- Imperial College London
- London SW7 2AZ
- UK
| | - E. M. Tuite
- School of Chemistry
- Newcastle University
- Newcastle upon Tyne
- UK
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Baggaley E, Botchway SW, Haycock JW, Morris H, Sazanovich IV, Williams JAG, Weinstein JA. Long-lived metal complexes open up microsecond lifetime imaging microscopy under multiphoton excitation: from FLIM to PLIM and beyond. Chem Sci 2014. [DOI: 10.1039/c3sc51875b] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Sharmin A, Salassa L, Rosenberg E, Ross JBA, Abbott G, Black L, Terwilliger M, Brooks R. Photophysical studies of bioconjugated ruthenium metal-ligand complexes incorporated in phospholipid membrane bilayers. Inorg Chem 2013; 52:10835-45. [PMID: 24063694 DOI: 10.1021/ic400706u] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The luminescent, mono-diimine ruthenium complexes [(H)Ru(CO)(PPh3)2(dcbpy)][PF6] (1) (dcbpy = 4,4'-dicarboxy-2,2'-bipyridyl) and [(H)Ru(CO)(dppene)(5-amino-1,10-phen)][PF6] (2) (dppene = bis(diphenylphosphino)ethylene; phen = phenanthroline) were conjugated with 1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine (DPPE) and with cholesterol in the case of complex 2. Using standard conjugation techniques, compound 1 gives the bis-lipid derivative [(H)Ru(CO)(PPh3)2(dcbpy-N-DPPE2)][PF6] (3), while 2 provides the monolipid conjugate [(H)Ru(CO)(dppene)(1,10-phen-5-NHC(S)-N-DPPE)][PF6] (4) and the cholesterol derivative [(H)Ru(CO)(dppene)(1,10-phen-5-NHC(O)Ocholesteryl)][PF6] (5). These compounds were characterized by spectroscopic methods, and their photophysical properties were measured in organic solvents. The luminescence of lipid conjugates 3 and 4 is quenched in organic solvents while compound 4 shows a weak, short-lived, blue-shifted emission in aqueous solution. The cholesterol conjugate 5 shows the long-lived, microsecond-time scale emission associated with triplet metal-to-ligand charge-transfer excited states. Incorporation of conjugate 3 in lipid bilayer vesicles restores the luminescence, but with blue shifts (~80 nm) accompanied by nanosecond-time scale lifetimes. In the vesicles conjugate 4 shows a short-lived and blue-shifted emission similar to that observed in solution but with increased intensity. Conjugation of the complex [(H)Ru(CO)(PhP2C2H4C(O)O-N-succinimidyl)2(bpy)][PF6] (6") (bpy = 2,2'-bipyridyl) with DPPE gives the phosphine-conjugated complex [(H)Ru(CO)(PhP2C2H4C(O)-N-DPPE)2(bpy)][PF6] (7). Complex 7 also exhibits a short-lived and blue-shifted emission in solution and in vesicles as observed for complexes 3 and 4. We have also conjugated the complex [Ru(bpy)2(5-amino-1,10-phen)][PF6]2 (8) with both cholesterol (9) and DPPE (10). Neither complex 9 nor the previously reported complex 10 exhibited the blue shifts observed for complexes 3 and 4 when incorporated into large unilamellar vesicles (LUVs). The anisotropies of the emissions of complexes 3, 4, and 7 were also measured in LUVs, and those of complex 5 were measured in both glycerol and LUVs. High fundamental anisotropies were observed for complexes 3, 4, and 7.
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Affiliation(s)
- Ayesha Sharmin
- Department of Chemistry and Biochemistry, University of Montana , Missoula, Montana 59812, United States
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7
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McKinley AW, Lincoln P, Tuite EM. Sensitivity of [Ru(phen)2dppz]2+ light switch emission to ionic strength, temperature, and DNA sequence and conformation. Dalton Trans 2013; 42:4081-90. [DOI: 10.1039/c3dt32555e] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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McKinley AW, Andersson J, Lincoln P, Tuite EM. DNA Sequence and Ancillary Ligand Modulate the Biexponential Emission Decay of Intercalated [Ru(L)2dppz]2+Enantiomers. Chemistry 2012; 18:15142-50. [DOI: 10.1002/chem.201201279] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Indexed: 02/01/2023]
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Synthesis, characterization, photophysical studies and interaction with DNA of a new family of Ru(II) furyl- and thienyl-imidazo-phenanthroline polypyridyl complexes. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.07.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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McKinley AW, Lincoln P, Tuite EM. Environmental effects on the photophysics of transition metal complexes with dipyrido[2,3-a:3′,2′-c]phenazine (dppz) and related ligands. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2011.06.012] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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11
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Svensson FR, Abrahamsson M, Strömberg N, Ewing AG, Lincoln P. Ruthenium(II) Complex Enantiomers as Cellular Probes for Diastereomeric Interactions in Confocal and Fluorescence Lifetime Imaging Microscopy. J Phys Chem Lett 2011; 2:397-401. [PMID: 21461029 PMCID: PMC3065721 DOI: 10.1021/jz101580e] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Ruthenium dipyridophenazine (dppz) complexes are sensitive luminescent probes for hydrophobic environments. Here, we apply multiple-frequency fluorescence lifetime imaging microscopy (FLIM) to Δ and Λ enantiomers of lipophilic ruthenium dppz complexes in live and fixed cells, and their different lifetime staining patterns are related to conventional intensity-based microscopy. Excited state lifetimes of the enantiomers determined from FLIM measurements correspond well with spectroscopically measured emission decay curves in pure microenvironments of DNA, phospholipid membrane or a model protein. We show that FLIM can be applied to monitor the long-lived excited states of ruthenium complex enantiomers and, combined with confocal microscopy, give new insight into their biomolecular binding and reveal differences in the microenvironment probed by the complexes.
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Affiliation(s)
- Frida R. Svensson
- Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
| | - Maria Abrahamsson
- Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
| | - Niklas Strömberg
- Chemistry and Materials Technology, SP Technical Research Institute of Sweden, SE-501 15 Borås, Sweden
| | - Andrew G. Ewing
- Department of Chemistry, Analytical Chemistry, Gothenburg University, Kemivägen 4, SE-41296 Gothenburg, Sweden
| | - Per Lincoln
- Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
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Tian X, Gill MR, Cantón I, Thomas JA, Battaglia G. Live Cell Luminescence Imaging As a Function of Delivery Mechanism. Chembiochem 2011; 12:548-51. [DOI: 10.1002/cbic.201000743] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2010] [Indexed: 01/19/2023]
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13
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Lei W, Zhou Q, Jiang G, Zhang B, Wang X. Photodynamic inactivation of Escherichia coli by Ru(ii) complexes. Photochem Photobiol Sci 2011; 10:887-90. [DOI: 10.1039/c0pp00275e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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14
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Bonnet S, Limburg B, Meeldijk JD, Klein Gebbink RJM, Killian JA. Ruthenium-Decorated Lipid Vesicles: Light-Induced Release of [Ru(terpy)(bpy)(OH2)]2+ and Thermal Back Coordination. J Am Chem Soc 2010; 133:252-61. [DOI: 10.1021/ja105025m] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sylvestre Bonnet
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Electron Microscopy Utrecht, Department of Biology,Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, and Biochemistry of Membranes, Bijvoet Center, Department of Chemistry, Faculty of Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Bart Limburg
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Electron Microscopy Utrecht, Department of Biology,Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, and Biochemistry of Membranes, Bijvoet Center, Department of Chemistry, Faculty of Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Johannes D. Meeldijk
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Electron Microscopy Utrecht, Department of Biology,Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, and Biochemistry of Membranes, Bijvoet Center, Department of Chemistry, Faculty of Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Robertus J. M. Klein Gebbink
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Electron Microscopy Utrecht, Department of Biology,Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, and Biochemistry of Membranes, Bijvoet Center, Department of Chemistry, Faculty of Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - J. Antoinette Killian
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Electron Microscopy Utrecht, Department of Biology,Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, and Biochemistry of Membranes, Bijvoet Center, Department of Chemistry, Faculty of Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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15
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Kim MS, Kim JH, Son BW, Kang JS. Dynamics of bacteriophage R17 probed with a long-lifetime Ru(II) metal-ligand complex. J Fluoresc 2010; 20:713-8. [PMID: 20195712 DOI: 10.1007/s10895-010-0612-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Accepted: 02/07/2010] [Indexed: 10/19/2022]
Abstract
The metal-ligand complex, [Ru(2,2'-bipyridine)(2)(4,4'-dicarboxy-2,2'-bipyridine)](2+) (RuBDc), was used as a spectroscopic probe for studying macromolecular dynamics. RuBDc is a very photostable probe that possesses favorable photophysical properties including long lifetime, high quantum yield, large Stokes' shift, and highly polarized emission. To further show the usefulness of this luminophore for probing macromolecular dynamics, we examined the intensity and anisotropy decays of RuBDc when conjugated to R17 bacteriophage using frequency-domain fluorometry with a blue light-emitting diode (LED) as the modulated light source. The intensity decays were best fit by a sum of two exponentials, and we obtained a longer mean lifetime at 4 degrees C (<tau> = 491.8 ns) as compared to that at 25 degrees C (<tau> = 435.1 ns). The anisotropy decay data showed a single rotational correlation time, which is typical for a spherical molecule, and the results showed a longer rotational correlation time at 4 degrees C (2,574.9 ns) than at 25 degrees C (2,070.1 ns). The use of RuBDc enabled us to measure the rotational correlation time up to several microseconds. These results indicate that RuBDc has significant potential for studying hydrodynamics of biological macromolecules.
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Affiliation(s)
- Myung Sup Kim
- Department of Oral Biochemistry and Molecular Biology, School of Dentistry, Pusan National University, Yangsan 626-870, Korea
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16
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Puckett CA, Barton JK. Fluorescein redirects a ruthenium-octaarginine conjugate to the nucleus. J Am Chem Soc 2009; 131:8738-9. [PMID: 19505141 DOI: 10.1021/ja9025165] [Citation(s) in RCA: 218] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cellular uptake and localization of a Ru-octaarginine conjugate with and without an appended fluorescein are compared. The inherent luminescence of the Ru(II) dipyridophenazine complex allows observation of its uptake without the addition of a fluorophore. Ru-octaarginine-fluorescein stains the cytosol, nuclei, and nucleoli of HeLa cells under conditions where the Ru-octaarginine conjugate without fluorescein shows only punctate cytoplasmic labeling. At higher concentrations, however, Ru-octaarginine without the fluorescein tag does exhibit cytoplasmic, nuclear, and nucleolar staining. Attaching fluorescein to Ru-octaarginine lowers the threshold concentration required for diffuse cytoplasmic labeling and nuclear entry. Hence, the localization of the fluorophore-bound peptide cannot serve as a proxy for that of the free peptide.
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Affiliation(s)
- Cindy A Puckett
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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17
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Jiang C, Tong MY, Armstrong DW, Perera S, Bao Y, MacDonnell FM. Enantiomeric separation of chiral ruthenium(II) complexes using capillary electrophoresis. Chirality 2009; 21:208-17. [DOI: 10.1002/chir.20641] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Svensson FR, Li M, Nordén B, Lincoln P. Luminescent Dipyridophenazine-Ruthenium Probes for Liposome Membranes. J Phys Chem B 2008; 112:10969-75. [DOI: 10.1021/jp803964x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Frida R. Svensson
- Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
| | - Minna Li
- Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
| | - Bengt Nordén
- Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
| | - Per Lincoln
- Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology, Kemivägen 10, SE-41296 Gothenburg, Sweden
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Piszczek G. Luminescent metal-ligand complexes as probes of macromolecular interactions and biopolymer dynamics. Arch Biochem Biophys 2006; 453:54-62. [PMID: 16603119 DOI: 10.1016/j.abb.2006.03.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Accepted: 03/05/2006] [Indexed: 11/26/2022]
Abstract
The knowledge of microsecond dynamics is important for an understanding of the mechanism and function of biological systems. Fluorescent techniques are well established in biophysical studies, but their applicability to probe microsecond timescale processes is limited. Luminescent metal-ligand complexes (MLCs) have created interest mainly due to their unique luminescent properties, such as the exceptionally long decay times and large fundamental anisotropy values, allowing examination of microsecond dynamics by fluorescence methods. MLC properties also greatly simplify instrumentation requirements and enable the use of light emitting diode excitation for time-resolved measurements. Recent literature illustrates how MLC labels take full advantage of well developed fluorescence techniques and how those methods can be extended to timescales not easily accessible with nanosecond probes. MLCs are now commercially available as reactive labels which give researchers access to methods that previously required more complex approaches. The present paper gives an overview of the applications of MLC probes to studies of molecular dynamics and interactions of proteins, membranes and nucleic acids.
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Affiliation(s)
- Grzegorz Piszczek
- Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
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Herman P, Malinsky J, Plasek J, Vecer J. Pseudo real-time method for monitoring of the limiting anisotropy in membranes. J Fluoresc 2005; 14:79-85. [PMID: 15622865 DOI: 10.1023/b:jofl.0000014664.60479.f2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Data acquisition and analysis of the time-resolved fluorescence anisotropy is typically a time consuming process preventing usage of this experimental method for monitoring of time-dependent phenomena. We describe a method for pseudo real-time monitoring of the limiting fluorescence anisotropy r(infinity) allowing to track changes of the membrane order occurring on the time scale of minutes. Principle and performance of the method is demonstrated in the time domain with the time-correlated single photon counting detection. DMPC liposomes stained with 1,6-diphenyl-1,3,5-hexatriene (DPH) have been used to test influence of the diffusion membrane potential on the membrane order during the temperature-induced phase transition in DMPC membranes. It has been found that the transmembrane field of the order of -70 mV increases the phase transition temperature by about 1.5 degrees C-2 degrees C. It is proposed that the full advantage of the method can be utilized with a gated detection, which besides a faster data acquisition brings additional advantage of excitation light suppression. The method can be also used for imaging.
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Affiliation(s)
- P Herman
- Institute of Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
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Olofsson J, Önfelt B, Lincoln P. Three-State Light Switch of [Ru(phen)2dppz]2+: Distinct Excited-State Species with Two, One, or No Hydrogen Bonds from Solvent. J Phys Chem A 2004. [DOI: 10.1021/jp037967k] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Johan Olofsson
- Department Chemistry and Bioscience, Physical Chemistry, Chalmers University of Technology, S-412 96 Gothenburg, Sweden, and Department of Biological Sciences, Sir Alexander Fleming Building, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United Kingdom
| | - Björn Önfelt
- Department Chemistry and Bioscience, Physical Chemistry, Chalmers University of Technology, S-412 96 Gothenburg, Sweden, and Department of Biological Sciences, Sir Alexander Fleming Building, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United Kingdom
| | - Per Lincoln
- Department Chemistry and Bioscience, Physical Chemistry, Chalmers University of Technology, S-412 96 Gothenburg, Sweden, and Department of Biological Sciences, Sir Alexander Fleming Building, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United Kingdom
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Synthesis and rapid enantiomeric separation of the chiral mixed ligand [5-(4-hydroxybutyl)-5′-methyl-2,2′-bipyridine]-bis(1,10-phenanthroline)-ruthenium(II) complex by electrokinetic chromatography. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00753-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Olofsson J, Onfelt B, Lincoln P, Nordén B, Matousek P, Parker AW, Tuite E. Picosecond Kerr-gated time-resolved resonance Raman spectroscopy of the [Ru(phen)(2)dppz](2+) interaction with DNA. J Inorg Biochem 2002; 91:286-97. [PMID: 12121787 DOI: 10.1016/s0162-0134(02)00466-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
To investigate the basis of the 'light-switch' effect, the solvent dependence of the Kerr-gated picosecond-time resolved resonance Raman (TR(3)) spectra of [Ru(bpy)(2)dppz](2+), [Ru(phen)(2)dppz](2+), and the modified complex [Ru(phen)(2)cpdppzOMe](2+) and a dimer [mu-C4(cpdppz)(2)-(phen)(4)Ru(2)](4+) were studied. The investigation focussed on comparing the behaviour of [Ru(phen)(2)dppz](2+) in acetonitrile, ethanol, H(2)O, D(2)O, and DNA. The data are consistent with a model wherein excitation induces metal-to-ligand charge transfer (MLCT) to any of the ligands (termed the 'precursor' state) which, by interligand electron transfer (ILET), produces an excited state localised on the dppz ligand, MLCT(1). In water this state relaxes with a characteristic time of approximately 6 ps to a non-emissive state (MLCT(2)). The TR(3) spectra in water, acetonitrile and DNA are all distinctly different. However, the early (4 ps) water spectrum resembles the spectrum in DNA. This interesting observation suggests that the DNA-bound excited state of the complex can be thought of as a model for the initial, poorly solvated state in water.
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Affiliation(s)
- Johan Olofsson
- Department of Physical Chemistry, Chalmers University of Technology, SE-412 96, Göteborg, Sweden
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Demehin AA, Abugo OO, Jayakumar R, Lakowicz JR, Rifkind JM. Binding of hemoglobin to red cell membranes with eosin-5-maleimide-labeled band 3: analysis of centrifugation and fluorescence data. Biochemistry 2002; 41:8630-7. [PMID: 12093280 PMCID: PMC6980380 DOI: 10.1021/bi012007e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have studied the binding of hemoglobin to the red cell membrane by centrifugation and fluorescence methods. The intact red cell was labeled with eosin-5-maleimide (EM), which specifically reacts with lysine 430 of band 3. Even though this residue is not part of the cytoplasmic domain of band 3 (cdb3) associated with hemoglobin binding, fluorescence quenching was observed when hemoglobin bound to inside-out vesicles (IOVs). The use of fluorescence quenching to measure band 3 binding was quantitatively compared with the binding determined by centrifugation, which measures binding to band 3 and non-band 3 sites. For the centrifugation it was necessary to include the non-band 3 association constants determined from chymotrypsin-treated IOVs. The binding of hemoglobin to band 3 was interpreted in terms of the binding of two hemoglobin tetramers to each band 3 dimer. An anticooperative interaction associated with the conformational change produced when hemoglobin binds results in a 2.8-fold decrease in the intrinsic constant of (1.54 +/- 0.25) x 10(7) M(-1) for the binding of the second hemoglobin molecule. From the changes in lifetime produced by binding the first and second hemoglobin molecules, it was possible to show that the conformational change associated with binding the second hemoglobin molecule results in a decrease of the heme-eosin distance from 47.90 to 44.78 A. Reaction of cyanate with the alpha-amino group of hemoglobin (HbOCN) is shown to produce a very dramatic decrease in the binding of hemoglobin to both the band 3 and non-band 3 sites. The intrinsic constant for binding the first hemoglobin molecule to band 3 decreases by a factor of 29 to (5.34 +/- 0.15) x 10(5) M(-1). The anticooperative interaction is greater with the intrinsic constant decreasing by a factor of 3.8 for the binding of the second hemoglobin tetramer to band 3. In addition, the nature of the conformational change produced by binding hemoglobin is very different with the second HbOCN increasing the heme-eosin distance to 55.99 A. The utilization of eosin-5-maleimide-reacted red cell membrane to study hemoglobin binding makes it possible to directly study the binding to band 3. At the same time a sensitive probe of the conformational changes, which occur when hemoglobin binds to band 3, is provided.
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Kang JS, Piszczek G, Lakowicz JR. High-molecular-weight protein hydrodynamics studied with a long-lifetime metal-ligand complex. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1597:221-8. [PMID: 12044900 PMCID: PMC6800114 DOI: 10.1016/s0167-4838(02)00281-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Ru(2,2'-bipyridine)(2)(4,4'-dicarboxy-2,2'-bipyridine)](2+) (RuBDc) is a very photostable probe that possesses favorable photophysical properties including long lifetime, high quantum yield, large Stokes' shift, and highly polarized emission. In the present study, we demonstrated the usefulness of this probe for monitoring the rotational diffusion of high-molecular-weight (MW) proteins. Using frequency-domain fluorometry with a high-intensity, blue light-emitting diode (LED) as the modulated light source, we compared the intensity and anisotropy decays of RuBDc conjugated to immunoglobulin G (IgG) and immunoglobulin M (IgM), which show a six-fold difference in MW We obtained slightly longer lifetimes for IgM (=428 ns in buffer) than IgG (=422 ns in buffer) in the absence and presence of glycerol, suggesting somewhat more efficient shielding of RuBDc from water in IgM than in IgG. The anisotropy decay data showed longer rotational correlation times for IgM (1623 and 65.7 ns in buffer) as compared to IgG (264 and 42.5 ns in buffer). Importantly, the ratio of the long rotational correlation times of IgM to IgG in buffer was 6.2, which is very close to that of MW of IgM to IgG (6.0). The shorter correlation times are most likely to be associated with domain motions within the proteins. The anisotropy decays reflect both the molecular size and shape of the immunoglobulins, as well as the viscosity. These results show that RuBDc can have numerous applications in studies of high-MW protein hydrodynamics and in fluorescence polarization immunoassays (FPI) of high-MW analytes.
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Affiliation(s)
- Jung Sook Kang
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, MD 21201, USA
- Department of Oral Biochemistry and Molecular Biology, College of Dentistry, Pusan National University, Pusan 602-739, South Korea
| | - Grzegorz Piszczek
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, MD 21201, USA
- Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland
| | - Joseph R. Lakowicz
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, MD 21201, USA
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Lakowicz JR, Gryczynski I, Piszczek G, Tolosa L, Nair R, Johnson ML, Nowaczyk K. Microsecond dynamics of biological macromolecules. Methods Enzymol 2001; 323:473-509. [PMID: 10944765 DOI: 10.1016/s0076-6879(00)23379-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- J R Lakowicz
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore 21201, USA
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Lakowicz JR, Gryczynski I, Gryczynski Z, Johnson ML. Background suppression in frequency-domain fluorometry. Anal Biochem 2000; 277:74-85. [PMID: 10610691 PMCID: PMC6911226 DOI: 10.1006/abio.1999.4346] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Gated detection is often used in time-domain measurements of long-lived fluorophores for suppression of interfering short-lived autofluorescence. However, no direct method has been available for gated detection and background suppression when using frequency-domain fluorometry. We describe a direct method for real-time suppression of autofluorescence in frequency-domain fluorometry. The method uses a gated detector and the sample is excited by a pulsed train. The detector is gated on following each excitation pulse after a suitable time delay for decay of the prompt autofluorescence. Under the same experimental conditions a detectable reference signal is obtained by using a long lifetime standard with a known decay time. Because the sample and reference signals are measured under identical excitation, gating and instrumental conditions, the data can be analyzed as usual for frequency-domain data without further processing. We show by simulations that this method can be used to resolve single and multiexponential decays in the presence of short lifetime autofluorescence.
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Affiliation(s)
- J R Lakowicz
- University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland, 21201, USA
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