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Timpmann K, Rätsep M, Freiberg A. Enhancing solar spectrum utilization in photosynthesis: exploring exciton and site energy shifts as key mechanisms. Sci Rep 2023; 13:22299. [PMID: 38102394 PMCID: PMC10724156 DOI: 10.1038/s41598-023-49729-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/11/2023] [Indexed: 12/17/2023] Open
Abstract
Photosynthesis is a critical process that harnesses solar energy to sustain life across Earth's intricate ecosystems. Central to this phenomenon is nuanced adaptation to a spectrum spanning approximately from 300 nm to nearly 1100 nm of solar irradiation, a trait enabling plants, algae, and phototrophic bacteria to flourish in their respective ecological niches. While the Sun's thermal radiance and the Earth's atmospheric translucence naturally constrain the ultraviolet extent of this range, a comprehension of how to optimize the utilization of near-infrared light has remained an enduring pursuit. This study unveils the remarkable capacity of the bacteriochlorophyll b-containing purple photosynthetic bacterium Blastochloris viridis to harness solar energy at extreme long wavelengths, a property attributed to a synergistic interplay of exciton and site energy shift mechanisms. Understanding the unique native adaptation mechanisms offers promising prospects for advancing sustainable energy technologies of solar energy conversion.
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Affiliation(s)
- Kõu Timpmann
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411, Tartu, Estonia
| | - Margus Rätsep
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411, Tartu, Estonia
| | - Arvi Freiberg
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411, Tartu, Estonia.
- Estonian Academy of Sciences, Kohtu 6, 10130, Tallinn, Estonia.
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Razjivin AP, Kozlovsky VS, Ashikhmin AA, Pishchalnikov RY. Gaussian Decomposition vs. Semiclassical Quantum Simulation: Obtaining the High-Order Derivatives of a Spectrum in the Case of Photosynthetic Pigment Optical Properties Studying. SENSORS (BASEL, SWITZERLAND) 2023; 23:8248. [PMID: 37837078 PMCID: PMC10574941 DOI: 10.3390/s23198248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 09/25/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023]
Abstract
In this paper, a procedure for obtaining undistorted high derivatives (up to the eighth order) of the optical absorption spectra of biomolecule pigments has been developed. To assess the effectiveness of the procedure, the theoretical spectra of bacteriochlorophyll a, chlorophyll a, spheroidene, and spheroidenone were simulated by fitting the experimental spectra using the differential evolution algorithm. The experimental spectra were also approximated using sets of Gaussians to calculate the model absorption spectra. Theoretical and model spectra can be differentiated without smoothing (high-frequency noise filtering) to obtain high derivatives. Superimposition of the noise track on the model spectra allows us to obtain test spectra similar to the experimental ones. Comparison of the high derivatives of the model spectra with those of the test spectra allows us to find the optimal parameters of the filter, the application of which leads to minimal differences between the high derivatives of the model and test spectra. For all four studied pigments, it was shown that smoothing the experimental spectra with optimal filters makes it possible to obtain the eighth derivatives of the experimental spectra, which were close to the eighth derivatives of their theoretical spectra.
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Affiliation(s)
- Andrei P. Razjivin
- Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, 119992 Moscow, Russia;
| | - Vladimir S. Kozlovsky
- Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, 119992 Moscow, Russia;
| | - Aleksandr A. Ashikhmin
- Institute of Basic Biological Problems, Russian Academy of Sciences, 142290 Pushchino, Russia;
| | - Roman Y. Pishchalnikov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
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Razjivin AP, Kozlovsky VS. Unique features of the 'photo-energetics' of purple bacteria: a critical survey by the late Aleksandr Yuryevich Borisov (1930-2019). PHOTOSYNTHESIS RESEARCH 2020; 146:17-24. [PMID: 31655967 DOI: 10.1007/s11120-019-00683-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 10/04/2019] [Indexed: 06/10/2023]
Abstract
We provide here an edited version of the "Farewell discussion" by the late Aleksandr (Alex) Yuryevich (Yu) Borisov (1930-2019) on several aspects related to the excitation energy transfer in photosynthetic bacteria. It is preceded by a prolog giving the events that led to our decision to publish it. Further, we include here a few photographs to give a personal glimpse of this unique biophysicist of our time. In addition, we provide here a reminiscence, by Andrei B. Rubin, on the scientific beginnings of Borisov. This article follows a Tribute to Borisov by Semenov et al. (2019, Photosynthesis Research, this issue).
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Affiliation(s)
- Andrei P Razjivin
- Department of Photosynthesis, A.N.Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - Vladimir S Kozlovsky
- Department of Photosynthesis, A.N.Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia
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Khmelnitskiy A, Reinot T, Jankowiak R. Mixed Upper Exciton State of the Special Pair in Bacterial Reaction Centers. J Phys Chem B 2019; 123:852-859. [PMID: 30624937 DOI: 10.1021/acs.jpcb.8b12542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Excitonic interactions between two closely separated bacteriochlorophyll a molecules (BChls) in the special pair of the reaction center (RC) of purple bacteria determine the positions and relative oscillator strengths of its two excitonic components. While the absorption of the lower excitonic band is well-defined, the position and the intensity of the upper excitonic band ( PY+) are still under debate. Recent 77 K two-dimensional electronic spectroscopy data on Rba. capsulatus suggested that the PY+ component absorbs at ∼840 nm, i.e., at a significantly lower energy than previously suggested. In the present work, we argue that the PY+ state is mixed with the excited states of the accessory BChls ( B*/ P Y+) leading to excitons contributing to the 785-825 nm spectral region which is consistent with previously published data. This conclusion is based on hole-burning/linear dichroism data and modeling studies of the excitonic structure of the RC using a non-Markovian reduced density matrix approach.
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Białek R, Swainsbury DJK, Wiesner M, Jones MR, Gibasiewicz K. Modelling of the cathodic and anodic photocurrents from Rhodobacter sphaeroides reaction centres immobilized on titanium dioxide. PHOTOSYNTHESIS RESEARCH 2018; 138:103-114. [PMID: 29971571 PMCID: PMC6208573 DOI: 10.1007/s11120-018-0550-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
As one of a number of new technologies for the harnessing of solar energy, there is interest in the development of photoelectrochemical cells based on reaction centres (RCs) from photosynthetic organisms such as the bacterium Rhodobacter (Rba.) sphaeroides. The cell architecture explored in this report is similar to that of a dye-sensitized solar cell but with delivery of electrons to a mesoporous layer of TiO2 by natural pigment-protein complexes rather than an artificial dye. Rba. sphaeroides RCs were bound to the deposited TiO2 via an engineered extramembrane peptide tag. Using TMPD (N,N,N',N'-tetramethyl-p-phenylenediamine) as an electrolyte, these biohybrid photoactive electrodes produced an output that was the net product of cathodic and anodic photocurrents. To explain the observed photocurrents, a kinetic model is proposed that includes (1) an anodic current attributed to injection of electrons from the triplet state of the RC primary electron donor (PT) to the TiO2 conduction band, (2) a cathodic current attributed to reduction of the photooxidized RC primary electron donor (P+) by surface states of the TiO2 and (3) transient cathodic and anodic current spikes due to oxidation/reduction of TMPD/TMPD+ at the conductive glass (FTO) substrate. This model explains the origin of the photocurrent spikes that appear in this system after turning illumination on or off, the reason for the appearance of net positive or negative stable photocurrents depending on experimental conditions, and the overall efficiency of the constructed cell. The model may be a used as a guide for improvement of the photocurrent efficiency of the presented system as well as, after appropriate adjustments, other biohybrid photoelectrodes.
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Affiliation(s)
- Rafał Białek
- Faculty of Physics, Adam Mickiewicz University in Poznań, ul. Umultowska 85, 61-614, Poznan, Poland.
| | - David J K Swainsbury
- School of Biochemistry, Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK
| | - Maciej Wiesner
- Faculty of Physics, Adam Mickiewicz University in Poznań, ul. Umultowska 85, 61-614, Poznan, Poland
- NanoBioMedical Center, Adam Mickiewicz University in Poznań, ul. Umultowska 85, 61-614, Poznan, Poland
| | - Michael R Jones
- School of Biochemistry, Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
| | - Krzysztof Gibasiewicz
- Faculty of Physics, Adam Mickiewicz University in Poznań, ul. Umultowska 85, 61-614, Poznan, Poland.
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Rancova O, Jankowiak R, Kell A, Jassas M, Abramavicius D. Band Structure of the Rhodobacter sphaeroides Photosynthetic Reaction Center from Low-Temperature Absorption and Hole-Burned Spectra. J Phys Chem B 2016; 120:5601-16. [DOI: 10.1021/acs.jpcb.6b02595] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Olga Rancova
- Department
of Theoretical Physics, Vilnius University, Sauletekio al 9-III, 10222 Vilnius, Lithuania
| | | | | | | | - Darius Abramavicius
- Department
of Theoretical Physics, Vilnius University, Sauletekio al 9-III, 10222 Vilnius, Lithuania
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Magdaong NCM, Niedzwiedzki DM, Goodson C, Blankenship RE. Carotenoid-to-Bacteriochlorophyll Energy Transfer in the LH1–RC Core Complex of a Bacteriochlorophyll b Containing Purple Photosynthetic Bacterium Blastochloris viridis. J Phys Chem B 2016; 120:5159-71. [DOI: 10.1021/acs.jpcb.6b04307] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikki Cecil M. Magdaong
- Department
of Biology, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
- Department of Chemistry, Washington University in Saint Louis, One Brookings Drive, St.
Louis, Missouri 63130 United States
- Photosynthetic
Antenna Research Center, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
| | - Dariusz M. Niedzwiedzki
- Photosynthetic
Antenna Research Center, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
| | - Carrie Goodson
- Department
of Biology, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
| | - Robert E. Blankenship
- Department
of Biology, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
- Department of Chemistry, Washington University in Saint Louis, One Brookings Drive, St.
Louis, Missouri 63130 United States
- Photosynthetic
Antenna Research Center, Washington University in Saint Louis, One Brookings
Drive, St. Louis, Missouri 63130 United States
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Malferrari M, Turina P, Francia F, Mezzetti A, Leibl W, Venturoli G. Dehydration affects the electronic structure of the primary electron donor in bacterial photosynthetic reaction centers: evidence from visible-NIR and light-induced difference FTIR spectroscopy. Photochem Photobiol Sci 2015; 14:238-51. [PMID: 25188921 DOI: 10.1039/c4pp00245h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The photosynthetic reaction center (RC) is a membrane pigment-protein complex that catalyzes the initial charge separation reactions of photosynthesis. Following photoexcitation, the RC undergoes conformational relaxations which stabilize the charge-separated state. Dehydration of the complex inhibits its conformational dynamics, providing a useful tool to gain insights into the relaxational processes. We analyzed the effects of dehydration on the electronic structure of the primary electron donor P, as probed by visible-NIR and light-induced FTIR difference spectroscopy, in RC films equilibrated at different relative humidities r. Previous FTIR and ENDOR spectroscopic studies revealed that P, an excitonically coupled dimer of bacteriochlorophylls, can be switched between two conformations, P866 and P850, which differ in the extent of delocalization of the unpaired electron between the two bacteriochlorophyll moieties (PL and PM) of the photo-oxidized radical P(+). We found that dehydration (at r = 11%) shifts the optical Qy band of P from 866 to 850-845 nm, a large part of the effect occurring already at r = 76%. Such a dehydration weakens light-induced difference FTIR marker bands, which probe the delocalization of charge distribution within the P(+) dimer (the electronic band of P(+) at 2700 cm(-1), and the associated phase-phonon vibrational modes at around 1300, 1480, and 1550 cm(-1)). From the analysis of the P(+) keto C[double bond, length as m-dash]O bands at 1703 and 1713-15 cm(-1), we inferred that dehydration induces a stronger localization of the unpaired electron on PL(+). The observed charge redistribution is discussed in relation to the dielectric relaxation of the photoexcited RC on a long (10(2) s) time scale.
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Affiliation(s)
- Marco Malferrari
- Dipartimento di Farmacia e Biotecnologie, FaBiT, Università di Bologna, Bologna, Italy.
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Borisov AY, Kozlovsky VS. Determination of the microvalues of dielectric constants in the membranes of purple bacteria. Biophysics (Nagoya-shi) 2015. [DOI: 10.1134/s0006350915040053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Leonova MM, Vasilieva LG, Khatypov RA, Boichenko VA, Shuvalov VA. Properties of mutant reaction centers of Rhodobacter sphaeroides with substitutions of histidine L153, the axial Mg2+ ligand of bacteriochlorophyll BA. BIOCHEMISTRY (MOSCOW) 2009; 74:452-60. [DOI: 10.1134/s0006297909040142] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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