1
|
Procházková M, Killinger M, Prokeš L, Klepárník K. Miniaturized bioluminescence technology for single-cell quantification of caspase-3/7. J Pharm Biomed Anal 2021; 209:114512. [PMID: 34891005 DOI: 10.1016/j.jpba.2021.114512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/26/2021] [Accepted: 11/27/2021] [Indexed: 11/25/2022]
Abstract
Correct determination of the instantaneous level and changes of relevant proteins inside individual cells is essential for correct interpretation and understanding of physiological, diagnostic, and therapeutic events. Thus, single-cell analyses are important for quantification of natural cellular heterogeneity, which cannot be evaluated from averaged data of a cell population measurements. Here, we developed an original highly sensitive and selective instrumentation and methodology based on homogeneous single-step bioluminescence assay to quantify caspases and evaluate their heterogeneity in individual cells. Individual suspended cells are selected under microscope and reliably transferred into the 7 µl detection vials by a micromanipulator. The sensitivity of the method is given by implementation of photomultiplying tube with a cooled photocathode working in the photon counting mode. By optimization of our device and methodology, the limits of detection and quantitation were decreased down to 2.1 and 7.0 fg of recombinant caspase-3, respectively. These masses are lower than average amounts of caspase-3/7 in individual apoptotic and even non-apoptotic cells. As a proof of concept, the content of caspase-3/7 in single treated and untreated HeLa cells was determined to be 154 and 25 fg, respectively. Based on these results, we aim to use the technology for investigations of non-apoptotic functions of caspases.
Collapse
Affiliation(s)
- Markéta Procházková
- Department of Bioanalytical Instrumentation, Institute of Analytical Chemistry, v.v.i., Czech Academy of Sciences, Veveří 97, Brno 602 00, Czech Republic; Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, Brno 611 37, Czech Republic.
| | - Michael Killinger
- Department of Bioanalytical Instrumentation, Institute of Analytical Chemistry, v.v.i., Czech Academy of Sciences, Veveří 97, Brno 602 00, Czech Republic; Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, Brno 611 37, Czech Republic.
| | - Lubomír Prokeš
- Department of Physics, Chemistry and Vocational Education, Faculty of Education, Masaryk University, Poříčí 7, Brno 603 00, Czech Republic.
| | - Karel Klepárník
- Department of Bioanalytical Instrumentation, Institute of Analytical Chemistry, v.v.i., Czech Academy of Sciences, Veveří 97, Brno 602 00, Czech Republic.
| |
Collapse
|
2
|
Syrjänpää M, Vuorinen E, Kulmala S, Wang Q, Härmä H, Kopra K. QTR-FRET: Efficient background reduction technology in time-resolved förster resonance energy transfer assays. Anal Chim Acta 2019; 1092:93-101. [PMID: 31708038 DOI: 10.1016/j.aca.2019.09.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 09/16/2019] [Indexed: 12/18/2022]
Abstract
A novel homogeneous assay system QTR-FRET (Quencher modulated Time-Resolved Förster Resonance Energy Transfer) combining quenching resonance energy transfer (QRET) and time-resolved Förster resonance energy transfer (TR-FRET) was developed to reduce background signal in the conventional energy transfer applications. The TR-FRET functionality is often limited by the lanthanide donor background signal leading to the use of low donor concentration. QTR-FRET reduces this background by introducing soluble quencher molecule, and in this work the concept functionality was proven and compared to previously introduced QRET and TR-FRET technologies. Comparison was performed with three different Eu3+-chelates exhibiting different luminescent lifetime and stability. The side-by-side comparison of the three signaling systems and Eu3+-chelates was demonstrated in a model assay with Eu3+-chelate conjugated biotin and streptavidin (SA) or Cy5-SA conjugate. Comparison of the methodologies showed increased signal-to-background ratios when comparing QTR-FRET to TR-FRET, especially at high Eu3+-biotin concentrations. Quenching the non-bound Eu3+-biotin improved the assay performance, which suggests that an improved assay performance can be attained with the QTR-FRET method. QTR-FRET is expected to be especially useful for Eu3+-labeled ligands with low affinity or assays requiring high Eu3+-ligand concentration. The QTR-FRET indicated potential for multi-analyte approaches separately utilizing the direct QRET-type Eu3+-chelate signal and energy transfer signal readout in a single-well. This potential was hypothesized with Avi-KRAS nucleotide exchange assay as a second biologically relevant model system.
Collapse
Affiliation(s)
- Markku Syrjänpää
- Institute of Biomedicine, Department of Cell Biology and Anatomy, Laboratory of Biophysics, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland
| | - Emmiliisa Vuorinen
- Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20500, Turku, Finland
| | - Sakari Kulmala
- Laboratory of Analytical Chemistry, Department of Chemistry, Aalto University, P.O. Box 16100, FI-00076, Aalto, Finland
| | - Qi Wang
- Institute of Biomedicine, Department of Cell Biology and Anatomy, Laboratory of Biophysics, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland
| | - Harri Härmä
- Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20500, Turku, Finland
| | - Kari Kopra
- Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20500, Turku, Finland.
| |
Collapse
|
3
|
Zhu D, Li W, Wen HM, Yu S, Miao ZY, Kang A, Zhang A. Silver nanoparticles-enhanced time-resolved fluorescence sensor for VEGF(165) based on Mn-doped ZnS quantum dots. Biosens Bioelectron 2015; 74:1053-60. [PMID: 26276542 DOI: 10.1016/j.bios.2015.08.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/04/2015] [Accepted: 08/05/2015] [Indexed: 01/31/2023]
Abstract
A silver nanoparticles (AgNPs)-enhanced time-resolved fluorescence (TR-FL) sensor based on long-lived fluorescent Mn-doped ZnS quantum dots (QDs) is developed for the sensitive detection of vascular endothelial growth factor-165 (VEGF165), a predominant cancer biomarker in cancer angiogenesis. The aptamers bond with the Mn-doped ZnS QDs and the BHQ-2 quencher-labelling strands hybridized in duplex are coupled with streptavidin (SA)-functionalized AgNPs to form the AgNPs-enhanced TR-FL sensor, showing lower fluorescence intensity in the duplex state due to the fluorescence resonance energy transfer (FRET) between the Mn-doped ZnS QDs and quenchers. Upon the addition of VEGF165, the BHQ-2 quencher-labelling strands of the duplex are displaced, leading to the disruption of the FRET. As a result, the fluorescence of the Mn-doped QDs within the proximity of the AgNPs is recovered. The FL signal can be measured free of the interference of short-lived background by setting appropriate delay time and gate time, which offers a signal with high signal-to-noise ratio in photoluminescent biodetection. Compared with the bare TR-FL sensor, the AgNPs-based TR-FL sensor showed a huge improvement in fluorescence based on metal-enhanced fluorescence (MEF) effect, and the sensitivity increased 11-fold with the detection limit of 0.08 nM. In addition, the sensor provided a wide range of linear detection from 0.1 nM to 16 nM.
Collapse
Affiliation(s)
- Dong Zhu
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China.
| | - Wei Li
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China.
| | - Hong-Mei Wen
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Sheng Yu
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Zhao-Yi Miao
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - An Kang
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Aihua Zhang
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| |
Collapse
|
4
|
Vuojola J, Soukka T. Luminescent lanthanide reporters: new concepts for use in bioanalytical applications. Methods Appl Fluoresc 2014; 2:012001. [DOI: 10.1088/2050-6120/2/1/012001] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
5
|
Huang F, Pei YY, Zuo HH, Chen JL, Yang Y, Su XC. Bioconjugation of proteins with a paramagnetic NMR and fluorescent tag. Chemistry 2013; 19:17141-9. [PMID: 24307370 DOI: 10.1002/chem.201302273] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Indexed: 11/05/2022]
Abstract
Site-specific labeling of proteins with lanthanide ions offers great opportunities for investigating the structure, function, and dynamics of proteins by virtue of the unique properties of lanthanides. Lanthanide-tagged proteins can be studied by NMR, X-ray, fluorescence, and EPR spectroscopy. However, the rigidity of a lanthanide tag in labeling of proteins plays a key role in the determination of protein structures and interactions. Pseudocontact shift (PCS) and paramagnetic relaxation enhancement (PRE) are valuable long-range structure restraints in structural-biology NMR spectroscopy. Generation of these paramagnetic restraints generally relies on site-specific tagging of the target proteins with paramagnetic species. To avoid nonspecific interaction between the target protein and paramagnetic tag and achieve reliable paramagnetic effects, the rigidity, stability, and size of lanthanide tag is highly important in paramagnetic labeling of proteins. Here 4'-mercapto-2,2':6',2''-terpyridine-6,6''-dicarboxylic acid (4MTDA) is introduced as a a rigid paramagnetic and fluorescent tag which can be site-specifically attached to a protein by formation of a disulfide bond. 4MTDA can be readily immobilized by coordination of the protein side chain to the lanthanide ion. Large PCSs and RDCs were observed for 4MTDA-tagged proteins in complexes with paramagnetic lanthanide ions. At an excitation wavelength of 340 nm, the complex formed by protein-4MTDA and Tb(3+) produces high fluorescence with the main emission at 545 nm. These interesting features of 4MTDA make it a very promising tag that can be exploited in NMR, fluorescence, and EPR spectroscopic studies on protein structure, interaction, and dynamics.
Collapse
Affiliation(s)
- Feng Huang
- State Key Laboratory of Elemento-organic Chemistry and College of Chemistry, Nankai University, Weijin Road 94, Tianjin 300071 (P. R. China), Fax: (+86) 22-23500623
| | | | | | | | | | | |
Collapse
|
6
|
Geißler D, Linden S, Liermann K, Wegner KD, Charbonnière LJ, Hildebrandt N. Lanthanides and Quantum Dots as Förster Resonance Energy Transfer Agents for Diagnostics and Cellular Imaging. Inorg Chem 2013; 53:1824-38. [DOI: 10.1021/ic4017883] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Daniel Geißler
- BAM, Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics, Berlin-Adlershof, Germany
| | - Stina Linden
- NanoBioPhotonics, Institut d’Electronique Fondamentale, Université Paris-Sud, Orsay, France
| | - Konstanze Liermann
- NanoPolyPhotonics, Fraunhofer Institute for Applied Polymer Research, Potsdam-Golm, Germany
| | - K. David Wegner
- NanoBioPhotonics, Institut d’Electronique Fondamentale, Université Paris-Sud, Orsay, France
| | - Loïc J. Charbonnière
- Laboratoire d’Ingénierie Moléculaire Appliquée
à l’Analyse, IPHC, UMR 7178 CNRS-Université de Strasbourg, ECPM, Strasbourg, France
| | - Niko Hildebrandt
- NanoBioPhotonics, Institut d’Electronique Fondamentale, Université Paris-Sud, Orsay, France
| |
Collapse
|
7
|
Zherdeva VV, Savitsky AP. Using lanthanide-based resonance energy transfer for in vitro and in vivo studies of biological processes. BIOCHEMISTRY (MOSCOW) 2013; 77:1553-74. [DOI: 10.1134/s0006297912130111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
8
|
Hötzer B, Medintz IL, Hildebrandt N. Fluorescence in nanobiotechnology: sophisticated fluorophores for novel applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:2297-326. [PMID: 22678833 DOI: 10.1002/smll.201200109] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 02/22/2012] [Indexed: 05/26/2023]
Abstract
Nanobiotechnology is one of the fastest growing and broadest-ranged interdisciplinary subfields of the nanosciences. Countless hybrid bio-inorganic composites are currently being pursued for various uses, including sensors for medical and diagnostic applications, light- and energy-harvesting devices, along with multifunctional architectures for electronics and advanced drug-delivery. Although many disparate biological and nanoscale materials will ultimately be utilized as the functional building blocks to create these devices, a common element found among a large proportion is that they exert or interact with light. Clearly continuing development will rely heavily on incorporating many different types of fluorophores into these composite materials. This review covers the growing utility of different classes of fluorophores in nanobiotechnology, from both a photophysical and a chemical perspective. For each major structural or functional class of fluorescent probe, several representative applications are provided, and the necessary technological background for acquiring the desired nano-bioanalytical information are presented.
Collapse
Affiliation(s)
- Benjamin Hötzer
- NanoBioPhotonics, Institut d'Electronique Fondamentale, Université Paris-Sud, 91405 Orsay Cedex, France
| | | | | |
Collapse
|
9
|
Vuojola J, Hyppänen I, Nummela M, Kankare J, Soukka T. Distance and temperature dependency in nonoverlapping and conventional Förster resonance energy-transfer. J Phys Chem B 2011; 115:13685-94. [PMID: 22007728 DOI: 10.1021/jp205564n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Förster resonance energy-transfer (FRET) is a powerful and widely applied bioanalytical tool. According to the definition of FRET by Förster, for energy-transfer to take place, a substantial spectral overlap between the donor emission and acceptor excitation spectra is required. Recently also a phenomenon termed nonoverlapping FRET (nFRET) has been reported. The nFRET phenomenon is based on energy-transfer between a lanthanide chelate donor and a spectrally nonoverlapping acceptor and thus obviously differs from the conventional FRET, but the mechanism of nFRET and resulting implications to assay design have not been thoroughly examined. In this work, a homogeneous DNA-hybridization assay was constructed to study the distance and temperature dependency of both nFRET and conventional FRET. Capture oligonucleotides were labeled at the 5'-end with a Eu(III)-chelate, and these conjugates hybridized to complementary tracer oligonucleotides labeled with an organic fluorophore at various distances from the 3'-end. The distance dependency was studied with a fluorometer utilizing time-resolution, and the temperature dependency was studied using a frequency-domain (FD) luminometer. Results demonstrated a difference in both the distance and temperature dependency between conventional FRET and nFRET. On the basis of our measurements, we propose that in nFRET thermal excitation occurs from the lowest radiative state of the ion to a higher excited state that is either ionic or associated with a ligand-to-metal charge-transfer state.
Collapse
Affiliation(s)
- Johanna Vuojola
- Department of Biotechnology, University of Turku, FI-20520 Turku, Finland.
| | | | | | | | | |
Collapse
|
10
|
Hyppänen I, Soukka T, Kankare J. Frequency-Domain Measurement of Luminescent Lanthanide Chelates. J Phys Chem A 2010; 114:7856-67. [DOI: 10.1021/jp103119w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Iko Hyppänen
- Laboratory of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20014 Turku, Finland, Graduate School of Chemical Sensors and Microanalytical Systems, and Department of Biotechnology, University of Turku, Tykistökatu 6 A sixth floor, FI-20520 Turku, Finland
| | - Tero Soukka
- Laboratory of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20014 Turku, Finland, Graduate School of Chemical Sensors and Microanalytical Systems, and Department of Biotechnology, University of Turku, Tykistökatu 6 A sixth floor, FI-20520 Turku, Finland
| | - Jouko Kankare
- Laboratory of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20014 Turku, Finland, Graduate School of Chemical Sensors and Microanalytical Systems, and Department of Biotechnology, University of Turku, Tykistökatu 6 A sixth floor, FI-20520 Turku, Finland
| |
Collapse
|
11
|
Varghese SS, Zhu Y, Davis TJ, Trowell SC. FRET for lab-on-a-chip devices - current trends and future prospects. LAB ON A CHIP 2010; 10:1355-64. [PMID: 20480105 DOI: 10.1039/b924271f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This review focuses on the use of Förster Resonance Energy Transfer (FRET) to monitor intra- and intermolecular reactions occurring in microfluidic reactors. Microfluidic devices have recently been used for performing highly efficient and miniaturised biological assays for the analysis of biological entities such as cells, proteins and nucleic acids. Microfluidic assays are characterised by nanolitre to femtolitre reaction volumes, which necessitates the adoption of a sensitive optical detection scheme. FRET serves as a strong 'spectroscopic ruler' for elucidating the tertiary structure of biomolecules, as the efficiency of the non-radiative energy transfer is extremely sensitive to nanoscale changes in the separation between donor and acceptor markers attached to the biomolecule of interest. In this review, we will review the implementation of various microfluidic assays which employ FRET for diverse applications in the biomedical field, along with the advantages and disadvantages of the various approaches. The future prospects for development of microfluidic devices incorporating FRET detection will be discussed.
Collapse
Affiliation(s)
- Smitha S Varghese
- CSIRO Materials Science and Engineering, PO Box 56, Highett, Melbourne, VIC 3190, Australia
| | | | | | | |
Collapse
|
12
|
Ruston L, Robertson G, Pikramenou Z. Luminescence Screening Assays for the Identification of Sensitizers for Lanthanides Based on the Controlled Formation of Ternary Lanthanide Complexes with DTPA-Bisamide Ligands. Chem Asian J 2010; 5:571-80. [DOI: 10.1002/asia.200900367] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
13
|
Affiliation(s)
- Jean-Claude G. Bünzli
- Laboratory of Lanthanide Supramolecular Chemistry, École Polytechnique Fédérale de Lausanne (EPFL), BCH 1402, CH-1015 Lausanne, Switzerland, and Department of Advanced Materials Chemistry, WCU Center for Next Generation Photovoltaic Systems, Korea University, Sejong Campus, 208 Seochang, Jochiwon, Chung Nam 339-700, Republic of Korea
| |
Collapse
|
14
|
Soukka T, Härmä H. Lanthanide Nanoparticules as Photoluminescent Reporters. LANTHANIDE LUMINESCENCE 2010. [DOI: 10.1007/4243_2010_11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
15
|
Vuojola J, Lamminmäki U, Soukka T. Resonance Energy Transfer from Lanthanide Chelates to Overlapping and Nonoverlapping Fluorescent Protein Acceptors. Anal Chem 2009; 81:5033-8. [DOI: 10.1021/ac9005793] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Johanna Vuojola
- Department of Biotechnology, University of Turku, Tykistökatu 6A, FI-20520 Turku, Finland
| | - Urpo Lamminmäki
- Department of Biotechnology, University of Turku, Tykistökatu 6A, FI-20520 Turku, Finland
| | - Tero Soukka
- Department of Biotechnology, University of Turku, Tykistökatu 6A, FI-20520 Turku, Finland
| |
Collapse
|
16
|
Ollikka P, Raussi HM, Laitala V, Jaakkola L, Hovinen J, Hemmilä I, Ylikoski A. Genotyping of celiac disease-related-risk haplotypes using a closed-tube polymerase chain reaction analysis of dried blood and saliva disk samples. Anal Biochem 2009; 386:20-9. [DOI: 10.1016/j.ab.2008.11.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2008] [Revised: 11/30/2008] [Accepted: 11/30/2008] [Indexed: 10/21/2022]
|
17
|
Bünzli JCG, Chauvin AS, Vandevyver CD, Bo S, Comby S. Lanthanide Bimetallic Helicates forin VitroImaging and Sensing. Ann N Y Acad Sci 2008; 1130:97-105. [DOI: 10.1196/annals.1430.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
18
|
Hanaoka K, Kikuchi K, Terai T, Komatsu T, Nagano T. A Gd3+-Based Magnetic Resonance Imaging Contrast Agent Sensitive to β-Galactosidase Activity Utilizing a Receptor-Induced Magnetization Enhancement (RIME) Phenomenon. Chemistry 2008; 14:987-95. [DOI: 10.1002/chem.200700785] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
19
|
Nishioka T, Fukui K, Matsumoto K. Chapter 234 Lanthanide Chelates as Luminescent Labels in Biomedical Analyses. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0168-1273(07)37034-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
|
20
|
Laitala V, Ylikoski A, Raussi HM, Ollikka P, Hemmilä I. Time-resolved detection probe for homogeneous nucleic acid analyses in one-step format. Anal Biochem 2006; 361:126-31. [PMID: 17188225 DOI: 10.1016/j.ab.2006.11.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2006] [Revised: 10/31/2006] [Accepted: 11/09/2006] [Indexed: 10/23/2022]
Abstract
We report here an extension of homogeneous assays based on fluorescence intensity and lifetime measuring on DNA hybridization. A novel decay probe that allows simple one-step nucleic acid detection with subnanomolar sensitivity, and is suitable for closed-tube applications, is introduced. The decay probe uses fluorescence resonance energy transfer (FRET) between a europium chelate donor and an organic fluorophore acceptor. The substantial change in the acceptor emission decay time on hybridization with the target sequence allows the direct separation of the hybridized and unhybridized probe populations in a time-resolved measurement. No additional sample manipulation or self-hybridization of the probes is required. The wavelength and decay time of a decay probe can be adjusted according to the selection of probe length and acceptor fluorophore, thereby making the probes applicable to multiplexed assays. Here we demonstrate the decay probe principle and decay probe-based, one-step, dual DNA assay using celiac disease-related target oligonucleotides (single-nucleotide polymorphisms [SNPs]) as model analytes. Decay probes showed specific response for their complementary DNA target and allowed good signal deconvolution based on simultaneous optical and temporal filtering. This technique potentially could be used to further increase the number of simultaneously detected DNA targets in a simple one-step homogeneous assay.
Collapse
Affiliation(s)
- Ville Laitala
- PerkinElmer Life and Analytical Sciences, Wallac, Fin-20101 Turku, Finland.
| | | | | | | | | |
Collapse
|
21
|
Allen JE, McLendon GL. Tryptophan and tyrosine to terbium fluorescence resonance energy transfer as a method to “map” aromatic residues and monitor docking. Biochem Biophys Res Commun 2006; 349:1264-8. [PMID: 16979582 DOI: 10.1016/j.bbrc.2006.08.165] [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] [Received: 08/25/2006] [Accepted: 08/28/2006] [Indexed: 10/24/2022]
Abstract
Fluorescent lanthanide ions, with large Stokes shifts and narrow emission bands, are excellent tools for the development of FRET-based assays. In this work, a terbium ion is tethered to a peptide which binds to the BIR3 domain of XIAP, an anti-apoptotic protein. Excitation of tryptophan and tyrosine residues in the BIR3 domain causes the peptide bound terbium ion to fluoresce relative to its distance from these aromatic residues. By developing ligands with terbium ions tethered at different residues, the relative terbium emission can be used to "map" the aromatic residues within the ligand binding pocket.
Collapse
Affiliation(s)
- John E Allen
- Department of Chemistry, Duke University, Durham, NC, USA
| | | |
Collapse
|
22
|
|
23
|
Laitala V, Hemmilä I. Homogeneous assay based on low quantum yield Sm(III)-donor and anti-Stokes’ shift time-resolved fluorescence resonance energy-transfer measurement. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.07.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
24
|
Hemmilä I, Laitala V. Progress in Lanthanides as Luminescent Probes. J Fluoresc 2005; 15:529-42. [PMID: 16167211 DOI: 10.1007/s10895-005-2826-6] [Citation(s) in RCA: 333] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Accepted: 03/01/2005] [Indexed: 12/20/2022]
Abstract
Lanthanides have recently found applications in different fields of biomolecular and medical research. Luminescent lanthanide chelates have created interest mainly due to their unique luminescent properties, such as their long Stokes' shift and exceptional decay times allowing efficient temporal discrimination of background interferences in the assays, such as immunoassays. Recently, new organometallic complexes have been developed giving opportunities to novel applications, in heterogeneous and homogeneous immunoassays, DNA hybridization assays, high-throughput screening as well as in imaging. In addition, encapsulating the chelates into suitable matrix in beads enables the use of new members of lanthanides extending the emission wavelength to micrometer range and decays from a few microseconds to milliseconds. As the luminescence is derived from complicated intra-chelate energy transfer, it also gives novel opportunities to exploit these levels in different types of energy transfer based applications. This review gives a short overview of recent development of lanthanide chelate-labels and discusses in more details of energy levels and their exploitation in new assay formats.
Collapse
Affiliation(s)
- I Hemmilä
- Perkin Elmer Life and Analytical Sciences, Wallac Oy, P.O. Box 10, FIN-20101, Turku, Finland.
| | | |
Collapse
|