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Najafi M, Zazubovich V. Monte Carlo Modeling of Spectral Diffusion Employing Multiwell Protein Energy Landscapes: Application to Pigment-Protein Complexes Involved in Photosynthesis. J Phys Chem B 2015; 119:7911-21. [PMID: 26020801 DOI: 10.1021/acs.jpcb.5b02764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We are reporting development and initial applications of the light-induced and thermally induced spectral diffusion modeling software, covering nonphotochemical spectral hole burning (NPHB), hole recovery, and single-molecule spectroscopy and involving random generation of the multiwell protein energy landscapes. The model includes tunneling and activated barrier-hopping in both ground and excited states of a protein-chromophore system. Evolution of such a system is predicted by solving the system of rate equations. Using the barrier parameters from the range typical for the energy landscapes of the pigment-protein complexes involved in photosynthesis, we (a) show that realistic cooling of the sample must result in proteins quite far from thermodynamic equilibrium, (b) demonstrate hole evolution in the cases of burning, fixed-temperature recovery and thermocycling that mostly agrees with the experiment and modeling based on the NPHB master equation, and (c) explore the effects of different protein energy landscapes on the antihole shape. Introducing the multiwell energy landscapes and starting the hole burning experiments in realistic nonequilibrium conditions are not sufficient to explain all experimental observations even qualitatively. Therefore, for instance, one is required to invoke the modified NPHB mechanism where a complex interplay of several small conformational changes is poising the energy landscape of the pigment-protein system for downhill tunneling.
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Affiliation(s)
- Mehdi Najafi
- Department of Physics, Concordia University, Montreal H4B 1R6, Quebec, Canada
| | - Valter Zazubovich
- Department of Physics, Concordia University, Montreal H4B 1R6, Quebec, Canada
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Najafi M, Herascu N, Shafiei G, Picorel R, Zazubovich V. Conformational Changes in Pigment–Protein Complexes at Low Temperatures—Spectral Memory and a Possibility of Cooperative Effects. J Phys Chem B 2015; 119:6930-40. [PMID: 25985255 DOI: 10.1021/acs.jpcb.5b02845] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mehdi Najafi
- Department
of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Nicoleta Herascu
- Department
of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Golia Shafiei
- Department
of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Rafael Picorel
- Estacion Experimental de Aula Dei (CSIC), Avda. Montañana 1005, 50059 Zaragoza, Spain
| | - Valter Zazubovich
- Department
of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
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Jankowiak R, Reppert M, Zazubovich V, Pieper J, Reinot T. Site Selective and Single Complex Laser-Based Spectroscopies: A Window on Excited State Electronic Structure, Excitation Energy Transfer, and Electron–Phonon Coupling of Selected Photosynthetic Complexes. Chem Rev 2011; 111:4546-98. [DOI: 10.1021/cr100234j] [Citation(s) in RCA: 122] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ryszard Jankowiak
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Mike Reppert
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Valter Zazubovich
- Department of Physics, Concordia University, Montreal H4B1R6 Quebec, Canada
| | - Jörg Pieper
- Max-Volmer-Laboratories for Biophysical Chemistry, Technical University of Berlin, Germany
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
| | - Tonu Reinot
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
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Milanovich N, Hayes JM, Small GJ. White Light Hole Burning of To-Pro-3 Bound to Oligomeric DNA. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259608042742] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- N. Milanovich
- a Department of Chemistry and Ames Laboratory-USDOE , Iowa State University , Ames , IA , 50011 , USA
| | - J. M. Hayes
- a Department of Chemistry and Ames Laboratory-USDOE , Iowa State University , Ames , IA , 50011 , USA
| | - G. J. Small
- a Department of Chemistry and Ames Laboratory-USDOE , Iowa State University , Ames , IA , 50011 , USA
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Chiang CC, Cheng JY, Cheng YR, Chen HS, Mou CY, Chang TC. Hole-Burning Structure and Mechanism of Acridine and Aminoacridines Doped in Polyvinyl Alcohol Films. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259608042745] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Chien-Chih Chiang
- a Institute of Atomic and Molecular Sciences , Academia Sinica. P. O. Box 23-166, Taipei , 10764 , Taiwan , ROC
- b Department of Chemistry , National Taiwan University , Taipei , Taiwan , ROC
| | - Ji-Yen Cheng
- a Institute of Atomic and Molecular Sciences , Academia Sinica. P. O. Box 23-166, Taipei , 10764 , Taiwan , ROC
- b Department of Chemistry , National Taiwan University , Taipei , Taiwan , ROC
| | - Yah-Ru Cheng
- a Institute of Atomic and Molecular Sciences , Academia Sinica. P. O. Box 23-166, Taipei , 10764 , Taiwan , ROC
- b Department of Chemistry , National Taiwan University , Taipei , Taiwan , ROC
| | - Hsuan-Shen Chen
- a Institute of Atomic and Molecular Sciences , Academia Sinica. P. O. Box 23-166, Taipei , 10764 , Taiwan , ROC
- b Department of Chemistry , National Taiwan University , Taipei , Taiwan , ROC
| | - Chung-Yuan Mou
- b Department of Chemistry , National Taiwan University , Taipei , Taiwan , ROC
| | - Ta-Chau Chang
- a Institute of Atomic and Molecular Sciences , Academia Sinica. P. O. Box 23-166, Taipei , 10764 , Taiwan , ROC
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Dispersive hole growth kinetics and fluence broadening of the zero-phonon hole of impurities in amorphous hosts. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2003.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Reinot T, Dang NC, Small GJ. A model for persistent hole burned spectra and hole growth kinetics that includes photoproduct absorption: Application to free base phthalocyanine in hyperquenched glassy ortho-dichlorobenzene at 5 K. J Chem Phys 2003. [DOI: 10.1063/1.1605371] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Broadband hole burning: a new technique for the measurement of hole burning kinetics, removing the influence of inhomogeneous broadening. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00820-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Reinot T, Small GJ. Non-Lorentzian zero-phonon holes and new insights on nonphotochemical hole burning: Al-phthalocyanine in hyperquenched glassy water. J Chem Phys 2001. [DOI: 10.1063/1.1367259] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Suisalu A, Mauring K, Kikas J, Herenyi L, Fidy J. Energy selection is not correlated in the Qx and Qy bands of a Mg-porphyrin embedded in a protein. Biophys J 2001; 80:498-504. [PMID: 11159420 PMCID: PMC1301251 DOI: 10.1016/s0006-3495(01)76032-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The Qx-Qy splitting observed in the fluorescence excitation spectra of Mg-mesoporphyrin-IX substituted horseradish peroxidase (MgMP-HRP) and of its complex with naphthohydroxamic acid (NHA) was studied by spectral hole burning techniques. The width of a hole directly burnt in the Qy band and that of a satellite hole indirectly produced in Qy as a result of hole burning in Qx was compared. We also studied the dependence of the satellite hole in the Qy band on the burning frequency used in the Qx band. Both the directly and indirectly burnt holes were very broad in the (higher energy) Qy band. The width of the satellite hole in the Qy band was equal to the entire width of the inhomogeneously broadened band, independently from the position of hole burning in Qx. This is indicative of a clear lack of correlation between the electronic transition energies of the Qx and Qy bands. A photoproduct was produced by laser irradiation of the MgMP-HRP/NHA complex and was identified as a species with lowered Q-splitting. Conversion of the photoproduct could be achieved by thermal activation measured in temperature-cycling experiments, with a characteristic temperature of 25 K. We attribute the phototransformation to a conformational change of MgMP.
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Affiliation(s)
- A Suisalu
- Institute of Physics, University of Tartu, EE2400 Tartu, Estonia
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Reinot T, Small GJ. Modeling of dispersive nonphotochemical hole growth kinetics data: Al-phthalocyanine tetrasulphonate in hyperquenched glassy water. J Chem Phys 2000. [DOI: 10.1063/1.1323228] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hole burning properties of aluminum phthalocyanine tetrasulphonate in water-containing poly(2-hydroxyethyl methacrylate) films. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00995-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nonphotochemical hole burning in Zn-TBP/PMMA. Unusual burning kinetics and very narrow holewidth limit. Chem Phys 1999. [DOI: 10.1016/s0301-0104(99)00094-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Reinot T, Hayes JM, Small GJ. Laser-induced hole filling and spectral diffusion of aluminum phthalocyanine tetrasulfonate in hyperquenched glassy films. J Chem Phys 1999. [DOI: 10.1063/1.478387] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pieper J, Rätsep M, Jankowiak R, Irrgang KD, Voigt J, Renger G, Small GJ. Qy-Level Structure and Dynamics of Solubilized Light-Harvesting Complex II of Green Plants: Pressure and Hole Burning Studies. J Phys Chem A 1999. [DOI: 10.1021/jp983957l] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Pieper
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - M. Rätsep
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - R. Jankowiak
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - K.-D. Irrgang
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - J. Voigt
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. Renger
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
| | - G. J. Small
- Institute of Physics, Humboldt University, 10099 Berlin, Germany, Ames LaboratoryU.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Max-Volmer Institute, Technical University, 10623 Berlin, Germany
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Milanovich N, Reinot T, Hayes JM, Small GJ. Aluminum phthalocyanine tetrasulfonate in MCF-10F, human breast epithelial cells: a hole burning study. Biophys J 1998; 74:2680-8. [PMID: 9591692 PMCID: PMC1299608 DOI: 10.1016/s0006-3495(98)77974-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Laser-induced holes are burned in the absorption spectrum of aluminum phthalocyanine tetrasulfonate (APT) in MCF-10F, human breast epithelial cells. The hole burning mechanism is shown to be nonphotochemical. The fluorescence excitation spectra and hole spectra are compared with those of APT in hyperquenched glassy films of water, ethanol, and methanol. The results show that the APT is in an acidic, aqueous environment with a hydrogen-bonded network similar to that of glassy water, but showing the influence of other cellular components. Pressure shifts of holes allow the local compressibility about the APT to be determined.
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Affiliation(s)
- N Milanovich
- Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, 50011, USA
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Abstract
A first real glance at the structural, spectral and temporal interplay that constitutes the photocycle of the photoactive yellow protein (PYP) has been obtained from a combination of time-resolved crystallography with mutational analysis and spectroscopic studies.
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Affiliation(s)
- I Schlichting
- Max Planck Institute for Molecular Physiology, Department of Physical Biochemistry, Dortmund, Germany.
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Reinot T, Kim W, Hayes JM, Small GJ. Electronic dephasing of APT in glassy films of water from 5 to 100 K: Implications for H‐bonding liquids. J Chem Phys 1996. [DOI: 10.1063/1.470804] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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On the validity of the standard model for primary charge separation in the bacterial reaction center. Chem Phys 1995. [DOI: 10.1016/0301-0104(95)00089-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Chiang CC, Wang JH, Cheng JY, Chang TC. Satellite holes of dye molecules doped in polymer films: intermolecular hydrogen-bond effect. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00411-v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Drobizhev M, Sapozhnikov M. A relationship between the kinetics of persistent spectral hole burning and its mechanism. Experiments with porphyrin dications. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00234-u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Dependence of non-photochemical hole-burning efficiency on the packing density of matrix polymers. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)87068-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Takahashi J, Tsuchiya J, Tanaka H, Kawasaki K. Thermally induced spectral diffusion for photoautomerization systems in polymer matrices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:6575-6580. [PMID: 10009375 DOI: 10.1103/physrevb.49.6575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jankowiak R, Small GJ. Spectral diffusion of molecular electronic transitions in amorphous solids: Weak and strong two-level-system phonon coupling. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:14805-14812. [PMID: 10005854 DOI: 10.1103/physrevb.47.14805] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jankowiak R, Small G. Origin of the T1.3 power law of pure dephasing for impurity electronic transitions in amorphous solids. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)89026-e] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Reddy NR, Kolaczkowski SV, Small GJ. A Photoinduced Persistent Structural Transformation of the Special Pair of a Bacterial Reaction Center. Science 1993; 260:68-71. [PMID: 17793534 DOI: 10.1126/science.260.5104.68] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Structural modification of photosynthetic reaction centers is an important approach for understanding their charge-separation processes. An unprecedented persistent structural transformation of the special pair (dimer) of bacteriochlorophyll molecules can be produced by light absorption alone. The nonphotochemical hole-burned spectra for the reaction center of Rhodopseudomonas viridis show that the phototransformation leads to a red shift of 150 wave numbers for the special pair's lowest energy absorption band, P960, and a comparable blue shift for a state at 850 nanometers, which can now be definitively assigned as being most closely associated with the upper dimer component. Additional insights on excited-state electronic structure include the identification of a new state.
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Reddy NR, Lyle PA, Small GJ. Applications of spectral hole burning spectroscopies to antenna and reaction center complexes. PHOTOSYNTHESIS RESEARCH 1992; 31:167-194. [PMID: 24408059 DOI: 10.1007/bf00035536] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/1991] [Accepted: 09/27/1991] [Indexed: 06/03/2023]
Abstract
The underlying principles of spectral hole burning spectroscopies and the theory for hole profiles are reviewed and illustrated with calculated spectra. The methodology by which the dependence of the overall hole profile on burn wavelength can be used to reveal the contributions from site inhomogeneous broadening and various homogeneous broadening contributions to the broad Qy-absorption bands of cofactors is emphasized. Applications to the primary electron donor states of the reaction centers of purple bacteria and Photosystems I and II of green plants are discussed. The antenna (light harvesting) complexes considered include B800-B850 and B875 of Rhodobacter sphaeroides and the base-plate complex of Prosthecochloris aestuarii with particular attention being given to excitonic interactions and level structure. The data presented show that spectral hole burning is a generally applicable low temperature approach for the study of excited state electronic and vibrational (intramolecular, phonon) structures, structural heterogeneity and excited state lifetimes.
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Affiliation(s)
- N R Reddy
- Ames Laboratory-USDOE, Iowa State University, 50011, Ames, IA, USA
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Littau KA, Dugan MA, Chen S, Fayer MD. Dynamics in a low‐temperature glass: Fast generation and detection of optical holes. J Chem Phys 1992. [DOI: 10.1063/1.461902] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Meijers HC, Wiersma DA. Glass dynamics probed by the long-lived stimulated photon echo. PHYSICAL REVIEW LETTERS 1992; 68:381-384. [PMID: 10045877 DOI: 10.1103/physrevlett.68.381] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Tang D, Jankowiak R, Seibert M, Small GJ. Effects of detergent on the excited state structure and relaxation dynamics of the photosystem II reaction center: A high resolution hole burning study. PHOTOSYNTHESIS RESEARCH 1991; 27:19-29. [PMID: 24414442 DOI: 10.1007/bf00029973] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/1990] [Accepted: 08/24/1990] [Indexed: 06/03/2023]
Abstract
Low temperature (4.2 K) absorption and hole burned spectra are reported for a stabilized preparation (no excess detergent) of the photosystem II reaction center complex. The complex was studied in glasses to which detergent had and had not been added. Triton X-100 (but not dodecyl maltoside) detergent was found to significantly affect the absorption and persistent hole spectra and to disrupt energy transfer from the accessory chlorophyll a to the active pheophytin a. However, Triton X-100 does not significantly affect the transient hole spectrum and lifetime (1.9 ps at 4.2 K) of the primary donor state, P680(*). Data are presented which indicate that the disruptive effects of Triton X-100 are not due to extraction of pigments from the reaction center, leaving structural perturbations as the most plausible explanation. In the absence of detergent the high resolution persistent hole spectra yield an energy transfer decay time for the accessory Chl a QY-state at 1.6 K of 12 ps, which is about three orders of magnitude longer than the corresponding time for the bacterial RC. In the presence of Triton X-100 the Chl a QY-state decay time is increased by at least a factor of 50.
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Affiliation(s)
- D Tang
- Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, 50011, Ames, IA, USA
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35
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Kenney M, Jankowiak R, Small G. Dispersive kinetics of nonphotochemical hole growth for oxazine 720 in glycerol, polyvinyl alcohol and their deuterated analogues. Chem Phys 1990. [DOI: 10.1016/0301-0104(90)90005-t] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Temperature dependence of photon-gated persistent spectral hole-burning for the meso-tetra-p-tolyl-Zn-tetrabenzoporphyrin/chloroform system in poly(methylmethacrylate). Chem Phys 1990. [DOI: 10.1016/0301-0104(90)80072-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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