1
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Shi B, Shin YK, Hassanali AA, Singer SJ. Biomolecules at the amorphous silica/water interface: Binding and fluorescence anisotropy of peptides. Colloids Surf B Biointerfaces 2017; 157:83-92. [DOI: 10.1016/j.colsurfb.2017.05.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 05/15/2017] [Accepted: 05/17/2017] [Indexed: 01/19/2023]
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2
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Mathes T, Heilmann M, Pandit A, Zhu J, Ravensbergen J, Kloz M, Fu Y, Smith BO, Christie JM, Jenkins GI, Kennis JTM. Proton-Coupled Electron Transfer Constitutes the Photoactivation Mechanism of the Plant Photoreceptor UVR8. J Am Chem Soc 2015; 137:8113-20. [DOI: 10.1021/jacs.5b01177] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tilo Mathes
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Monika Heilmann
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Anjali Pandit
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
- Department
of Solid-State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg
55, 2333 CC Leiden, The Netherlands
| | - Jingyi Zhu
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Janneke Ravensbergen
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Miroslav Kloz
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Yinan Fu
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Brian O. Smith
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - John M. Christie
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Gareth I. Jenkins
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - John T. M. Kennis
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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3
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Maity I, Mukherjee TK, Das AK. Photophysical study of a π-stacked β-sheet nanofibril forming peptide bolaamphiphile hydrogel. NEW J CHEM 2014. [DOI: 10.1039/c3nj00814b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Stefureac RI, Kachayev A, Lee JS. Modulation of the translocation of peptides through nanopores by the application of an AC electric field. Chem Commun (Camb) 2012; 48:1928-30. [DOI: 10.1039/c2cc17015a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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5
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Laptenok SP, Visser NV, Engel R, Westphal AH, van Hoek A, van Mierlo CPM, van Stokkum IHM, van Amerongen H, Visser AJWG. A General Approach for Detecting Folding Intermediates from Steady-State and Time-Resolved Fluorescence of Single-Tryptophan-Containing Proteins. Biochemistry 2011; 50:3441-50. [PMID: 21425856 DOI: 10.1021/bi101965d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergey P. Laptenok
- Department of Physics and Astronomy, Faculty of Exact Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | | | | | | | | | | | - Ivo H. M. van Stokkum
- Department of Physics and Astronomy, Faculty of Exact Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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6
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Kuczera K, Unruh J, Johnson CK, Jas GS. Reorientations of Aromatic Amino Acids and Their Side Chain Models: Anisotropy Measurements and Molecular Dynamics Simulations. J Phys Chem A 2009; 114:133-42. [DOI: 10.1021/jp907382h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Krzysztof Kuczera
- Department of Chemistry and Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas 66045, and Department of Chemistry and Biochemistry, and Institute of Biomedical Studies, Baylor University, Waco, Texas 76706
| | - Jay Unruh
- Department of Chemistry and Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas 66045, and Department of Chemistry and Biochemistry, and Institute of Biomedical Studies, Baylor University, Waco, Texas 76706
| | - Carey K. Johnson
- Department of Chemistry and Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas 66045, and Department of Chemistry and Biochemistry, and Institute of Biomedical Studies, Baylor University, Waco, Texas 76706
| | - Gouri S. Jas
- Department of Chemistry and Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas 66045, and Department of Chemistry and Biochemistry, and Institute of Biomedical Studies, Baylor University, Waco, Texas 76706
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7
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Quasi-static self-quenching of Trp-X and X-Trp dipeptides in water: ultrafast fluorescence decay. J Phys Chem B 2009; 113:12084-9. [PMID: 19708715 DOI: 10.1021/jp903078x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Time-resolved fluorescence decay profiles of N-acetyl-l-tryptophanamide (NATA) and tryptophan (Trp) dipeptides of the form Trp-X and X-Trp, where X is another aminoacyl residue, have been investigated using an ultraviolet upconversion spectrophoto fluorometer with time resolution better than 350 fs, together with a time-correlated single photon counting apparatus on the 100 ps to 20 ns time scale. We analyzed the set of fluorescence decay profiles at multiple wavelengths using the global analysis technique. Nanosecond fluorescence transients for Trp dipeptides all show multiexponential decay, while NATA exhibits a monoexponential decay near 3 ns independent of pH. In the first 100 ps, a time constant for the water "bulk relaxation" around Trp, NATA and Trp dipeptides are seen near 1-2 ps, with an associated preexponential amplitude that is positive or negative, depending on emission wavelength, as expected for a population conserving spectral shift. The initial brightness (sub-picosecond) we measure for all these dipeptides is less than that of NATA, implying even faster (<200 fs) intramolecular (quasi-) static quenching occurs within them. A new, third, ultrafast decay, bearing an exponential time constant of 20-30 ps with positive amplitude, has been found in many of these dipeptides. We believe it verifies our previous predictions of dipeptide QSSQ ("quasi-static self-quenching")-the loss of quantum yield to sub-100-ps decay process (Chen, R. F.; et al. Biochemistry 1991, 30, 5184). Most important, this term is found in proteins as well (Xu, J.; et al. J. Am. Chem. Soc. 2006, 128, 1214; Biophys. J. 2008, 94, 546; 2009, 96, 46a), suggesting an ultrafast quenching mechanism must be common to both.
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8
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De Almeida RFM, Loura LMS, Prieto M, Watts A, Fedorov A, Barrantes FJ. Structure and dynamics of the γM4 transmembrane domain of the acetylcholine receptor in lipid bilayers: insights into receptor assembly and function. Mol Membr Biol 2009; 23:305-15. [PMID: 16923724 DOI: 10.1080/09687860600703613] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A 28-mer peptide (gammaM4) corresponding to the fourth transmembrane segment of the nicotinic acetylcholine receptor (AChR) gamma-subunit, with a single tryptophan residue (Trp6), was reconstituted into lipid bilayers of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), loaded with either high or low amounts of cholesterol, i.e., in the conjugated liquid-ordered and liquid-disordered phases, respectively, at room temperature. By making use of the Trp intrinsic fluorescence, both steady-state and time-resolved fluorescence techniques were employed, namely, red-edge excitation shift effect, decay-associated spectra (DAS), and time-resolved anisotropy. The results obtained here, together with previous studies on the same reconstituted peptide, indicate that: (i) Trp6 is strongly anchored in the bilayer with a defined transverse location; (ii) the modifications in the measured DAS are related to the complex result of a self-quenching process on the decay parameters; (iii) the wobbling movement of the indole moiety of Trp6 is fast but severely restricted in amplitude; and, (iv) in the liquid-ordered phase, the bilayer properties and the tilt angle of the peptide enhance peptide-peptide interactions, with the formation of peptide rich patches and possibly some anti-parallel helix-helix aggregates, showing different dynamics from that of the peptide in the liquid-disordered phase where the peptide is randomly distributed.
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Affiliation(s)
- Rodrigo F M De Almeida
- Centro de Química e Bioquímica, Faculdade de Ciências de Lisboa, Campo Grande, Lisboa, Portugal.
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9
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Otosu T, Nishimoto E, Yamashita S. Fluorescence Decay Characteristics of Indole Compounds Revealed by Time-Resolved Area-Normalized Emission Spectroscopy. J Phys Chem A 2009; 113:2847-53. [DOI: 10.1021/jp8078937] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuhiro Otosu
- Institute of Biophysics, Faculty of Agriculture, Graduate School of Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
| | - Etsuko Nishimoto
- Institute of Biophysics, Faculty of Agriculture, Graduate School of Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
| | - Shoji Yamashita
- Institute of Biophysics, Faculty of Agriculture, Graduate School of Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
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10
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Callis PR. Exploring the Electrostatic Landscape of Proteins with Tryptophan Fluorescence. REVIEWS IN FLUORESCENCE 2009. [DOI: 10.1007/978-0-387-88722-7_10] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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11
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Pandit A, Fay N, Bordes L, Valéry C, Cherif-Cheikh R, Robert B, Artzner F, Paternostre M. Self-assembly of the octapeptide lanreotide and lanreotide-based derivatives: the role of the aromatic residues. J Pept Sci 2008; 14:66-75. [PMID: 17929329 DOI: 10.1002/psc.913] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We investigated the spectroscopic properties of the aromatic residues in a set of octapeptides with various self-assembly properties. These octapeptides are based on lanreotide, a cyclic peptide analogue of somatostatin-14 that spontaneously self-assembles into very long and monodisperse hollow nanotubes. A previous study on these lanreotide-based derivatives has shown that the disulfide bridge, the peptide hairpin conformation and the aromatic residues are involved in the self-assembly process and that modification of these properties either decreases the self-assembly propensity or modifies the molecular packing resulting in different self-assembled architectures. In this study we probed the local environment of the aromatic residues, naphthyl-alanine, tryptophan and tyrosine, by Raman and fluorescence spectroscopy, comparing nonassembled peptides at low concentrations with the self-assembled ones at high concentrations. As expected, the spectroscopic characteristics of the aromatic residues were found to be sensitive to the peptide-peptide interactions. Among the most remarkable features we could record a very unusual Raman spectrum for the tyrosine of lanreotide in relation to its propensity to form H-bonds within the assemblies. In Lanreotide nanotubes, and also in the supramolecular architectures formed by its derivatives, the tryptophan side chain is water-exposed. Finally, the low fluorescence polarization of the peptide aggregates suggests that fluorescence energy transfer occurs within the nanotubes.
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Affiliation(s)
- Anjali Pandit
- IBITECS, CEA and CNRS, F-91191 Gif-sur-Yvette, France
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12
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Munson CA, Kelepouris L, Baker GA, Baker SN, Blanchard GJ, Bright FV. On the behavior of indole-containing species sequestered within reverse micelles at sub-zero temperatures. APPLIED SPECTROSCOPY 2007; 61:537-47. [PMID: 17555624 DOI: 10.1366/000370207780807795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We report on the effects of temperature (+30 to -100 degrees C) on the fluorescence from N-acetyl tryptophanamide (NATA) and human serum albumin (HSA) sequestered within Aerosol-OT (AOT) reversed micelles. NATA reports simultaneously from the polar and non-polar side of the reverse micelle interface. As the sample temperature decreases, the relative fraction of NATA molecules associated with the polar side increases. This redistribution process is characterized by DeltaH = -14.8 +/- 0.6 kJ/mol and DeltaS = -54 +/- 2 J/(K mol). The activation energy for thermal quenching (E(a,TQ)) associated with the polar side NATA molecules is 6.7 kJ/mol before the micelles have shed water and 1.0 kJ/mol after water shedding (below approximately -20 degrees C). The time-resolved fluorescence intensity decay for tryptophan-214 in HSA is triple exponential. We suggest that these lifetimes arise from three indole residue conformations in equilibrium. Cooling the sample causes a freezing-in of the least quenched conformer; the other conformers are frozen out. The E(a,TQ) value for the shortest lifetime component is 6 kJ/mol. The E(a,TQ) for the long and intermediate lifetime components are equivalent (approximately 1.5 kJ/mol).
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Affiliation(s)
- Chase A Munson
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA
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13
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Shaw AK, Sarkar R, Banerjee D, Hintschich S, Monkman A, Pal SK. Direct observation of protein residue solvation dynamics. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.05.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Xu J, Toptygin D, Graver KJ, Albertini RA, Savtchenko RS, Meadow ND, Roseman S, Callis PR, Brand L, Knutson JR. Ultrafast Fluorescence Dynamics of Tryptophan in the Proteins Monellin and IIAGlc. J Am Chem Soc 2006; 128:1214-21. [PMID: 16433538 DOI: 10.1021/ja055746h] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complete time-resolved fluorescence of tryptophan in the proteins monellin and IIA(Glc) has been investigated, using both an upconversion spectrophotofluorometer with 150 fs time resolution and a time-correlated single photon counting apparatus on the 100 ps to 20 ns time scale. In monellin, the fluorescence decay displays multiexponential character with decay times of 1.2 and 16 ps, and 0.6, 2.2, and 4.2 ns. In contrast, IIA(Glc) exhibited no component between 1.2 ps and 0.1 ns. For monellin, surprisingly, the 16 ps fluorescence component was found to have positive amplitude even at longer wavelengths (e.g., 400 nm). In conjunction with quantum mechanical simulation of tryptophan in monellin, the experimental decay associated spectra (DAS) and time-resolved emission spectra (TRES) indicate that this fluorescence decay time should be ascribed to a highly quenched conformer. Recent models (Peon, J.; et al. Proc. Natl.Acad. Sci. U.S.A. 2002, 99, 10964) invoked exchange-coupled relaxation of protein water to explain the fluorescence decay of monellin.
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Affiliation(s)
- Jianhua Xu
- Optical Spectroscopy Section, Laboratory of Biophysical Chemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1412, USA
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15
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Stortelder A, Keizers P, Oostenbrink C, De Graaf C, De Kruijf P, Vermeulen N, Gooijer C, Commandeur J, Van Der Zwan G. Binding of 7-methoxy-4-(aminomethyl)-coumarin to wild-type and W128F mutant cytochrome P450 2D6 studied by time-resolved fluorescence spectroscopy. Biochem J 2006; 393:635-43. [PMID: 16190863 PMCID: PMC1360716 DOI: 10.1042/bj20051169] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 09/02/2005] [Accepted: 09/28/2005] [Indexed: 11/17/2022]
Abstract
Enzyme structure and dynamics may play a main role in substrate binding and the subsequent steps in the CYP (cytochrome P450) catalytic cycle. In the present study, changes in the structure of human CYP2D6 upon binding of the substrate are studied using steady-state and time-resolved fluorescence methods, focusing not only on the emission of the tryptophan residues, but also on emission of the substrate. As a substrate, MAMC [7-methoxy-4-(aminomethyl)-coumarin] was selected, a compound exhibiting native fluorescence. As well as the wild-type, the W128F (Trp128-->Phe) mutant of CYP2D6 was studied. After binding, a variety of energy transfer possibilities exist, and molecular dynamics simulations were performed to calculate distances and relative orientations of donors and acceptors. Energy transfer from Trp128 to haem appeared to be important; its emission was related to the shortest of the three average tryptophan fluorescence lifetimes observed for CYP2D6. MAMC to haem energy transfer was very efficient as well: when bound in the active site, the emission of MAMC was fully quenched. Steady-state anisotropy revealed that besides the MAMC in the active site, another 2.4% of MAMC was bound outside of the active site to wild-type CYP2D6. The tryptophan residues in CYP2D6 appeared to be less accessible for the external quenchers iodide and acrylamide in presence of MAMC, indicating a tightening of the enzyme structure upon substrate binding. However, the changes in the overall enzyme structure were not very large, since the emission characteristics of the enzyme were not very different in the presence of MAMC.
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Key Words
- cytochrome p450
- energy transfer
- enzyme structure
- substrate binding
- time-resolved fluorescence
- cyp, cytochrome p450
- das, decay-associated spectra
- fret, förster resonance energy transfer
- hamc, 7-hydroxy-4-(aminomethyl)-coumarin
- mamc, 7-methoxy-4-(aminomethyl)-coumarin
- md, molecular dynamics
- ni-nta, ni2+-nitrilotriacetate
- r.m.s.d., root-mean-square deviation
- sasa, solvent-accessible surface area
- tcspc, time-correlated single-photon counting
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Affiliation(s)
- Aike Stortelder
- *Laser Centre VU, Department of Analytical Chemistry and Applied Spectroscopy, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Peter H. J. Keizers
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Chris Oostenbrink
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Chris De Graaf
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Petra De Kruijf
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Nico P. E. Vermeulen
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Cees Gooijer
- *Laser Centre VU, Department of Analytical Chemistry and Applied Spectroscopy, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Jan N. M. Commandeur
- †LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Gert Van Der Zwan
- *Laser Centre VU, Department of Analytical Chemistry and Applied Spectroscopy, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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16
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Stortelder A, Buijs JB, Bulthuis J, van der Vies SM, Gooijer C, van der Zwan G. Time-resolved fluorescence of the bacteriophage T4 capsid protein gp23. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2005; 78:53-60. [PMID: 15629249 DOI: 10.1016/j.jphotobiol.2004.09.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2004] [Revised: 08/10/2004] [Accepted: 09/13/2004] [Indexed: 11/29/2022]
Abstract
The time-resolved fluorescence properties of the bacteriophage T4 capsid protein gp23 are investigated. The structural characteristics of this protein are largely unknown and can be probed by recording time-resolved and decay-associated fluorescence spectra and intensity decay curves using a 200 ps-gated intensified CCD-camera. Spectral and decay data are recorded simultaneously, which makes data acquisition fast compared to time-correlated single-photon counting. A red-shift of the emission maximum within the first nanosecond of decay is observed, which can be explained by the different decay-associated spectra of fluorescence lifetimes of the protein in combination with dipolar relaxation. In addition, iodide quenching experiments are performed, to study the degree of exposure of the various tryptophan residues. A model for the origin of the observed lifetimes of 0.032 +/- 0.003, 0.39 +/- 0.06, 2.1 +/- 0.1 and 6.8 +/- 0.8 ns is presented: the 32 ps lifetime can be assigned to the emission of a buried tryptophan residue, the 0.4 and 2.1 ns lifetimes to two partly buried residues, and the 6.8 ns lifetime to a single tryptophan outside the bulk of the folded gp23.
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Affiliation(s)
- Aike Stortelder
- Department of Analytical Chemistry and Applied Spectroscopy, Faculty of Sciences, Vrije Universiteit, Laser Centre VU, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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17
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Abstract
The peptide bond quenches tryptophan fluorescence by excited-state electron transfer, which probably accounts for most of the variation in fluorescence intensity of peptides and proteins. A series of seven peptides was designed with a single tryptophan, identical amino acid composition, and peptide bond as the only known quenching group. The solution structure and side-chain chi(1) rotamer populations of the peptides were determined by one-dimensional and two-dimensional (1)H-NMR. All peptides have a single backbone conformation. The -, psi-angles and chi(1) rotamer populations of tryptophan vary with position in the sequence. The peptides have fluorescence emission maxima of 350-355 nm, quantum yields of 0.04-0.24, and triple exponential fluorescence decays with lifetimes of 4.4-6.6, 1.4-3.2, and 0.2-1.0 ns at 5 degrees C. Lifetimes were correlated with ground-state conformers in six peptides by assigning the major lifetime component to the major NMR-determined chi(1) rotamer. In five peptides the chi(1) = -60 degrees rotamer of tryptophan has lifetimes of 2.7-5.5 ns, depending on local backbone conformation. In one peptide the chi(1) = 180 degrees rotamer has a 0.5-ns lifetime. This series of small peptides vividly demonstrates the dominant role of peptide bond quenching in tryptophan fluorescence.
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Affiliation(s)
- Chia-Pin Pan
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio, USA
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18
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Stortelder A, Buijs JB, Bulthuis J, Gooijer C, van der Zwan G. Fast-gated intensified charge-coupled device camera to record time-resolved fluorescence spectra of tryptophan. APPLIED SPECTROSCOPY 2004; 58:705-710. [PMID: 15198823 DOI: 10.1366/000370204872908] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The possibilities of a 200 ps gated intensified charge-coupled device (CCD) camera to record time-resolved fluorescence were explored using the fluorescing amino acid tryptophan and its derivative Nacetyl-tryptophan amide (NATA) as model compounds. The results were compared to complementary data from time-correlated single-photon counting (TCSPC) experiments. If a spectral resolution of 1-2 nm is desired, the fast-gated intensified CCD (ICCD) camera is the method of choice. For a 10(-5) M tryptophan solution, time-resolved emission spectra and intensity decays (measured over 12 ns at 25 ps resolution) could be obtained in typically 10 minutes, giving the well-known lifetimes of 0.5 and 3 ns. In addition, a longer lifetime of 7 ns was found at the red edge of the spectrum. The very short gate time of the ICCD camera allowed us to observe a shift in the emission maximum of tryptophan even within the first nanosecond of decay of the fluorescence emission. As expected from the tryptophan rotamer model, such a shift is not observed in NATA. Using amplitudes obtained by global analysis, decay-associated spectra of these lifetimes were constructed.
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Affiliation(s)
- Aike Stortelder
- Department of Analytical Chemistry and Applied Spectroscopy, Vrije Universiteit, Faculty of Sciences, Laser Centre VU, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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19
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Prazeres TJV, Fedorov A, Martinho JMG. Dynamics of Oligonucleotides Adsorbed on Thermosensitive Core−Shell Latex Particles. J Phys Chem B 2004. [DOI: 10.1021/jp0489931] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. J. V. Prazeres
- Centro de Química-Física Molecular, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - A. Fedorov
- Centro de Química-Física Molecular, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - J. M. G. Martinho
- Centro de Química-Física Molecular, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
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20
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Lu W, Kim J, Qiu W, Zhong D. Femtosecond studies of tryptophan solvation: correlation function and water dynamics at lipid surfaces. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.03.012] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bright FV, Munson CA. Time-resolved fluorescence spectroscopy for illuminating complex systems. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00723-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pandit A, Larsen OFA, van Stokkum IHM, van Grondelle R, Kraayenhof R, van Amerongen H. Ultrafast Polarized Fluorescence Measurements on Monomeric and Self-Associated Melittin. J Phys Chem B 2003. [DOI: 10.1021/jp021757a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anjali Pandit
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Olaf F. A. Larsen
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Ivo H. M. van Stokkum
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Rienk van Grondelle
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Ruud Kraayenhof
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Herbert van Amerongen
- Department of Structural Biology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, and Laboratory of Biophysics, Department of Agrotechnology and Food Sciences, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
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