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Assefa GT, Botha JL, van Heerden B, Kyeyune F, Krüger TPJ, Gwizdala M. ApcE plays an important role in light-induced excitation energy dissipation in the Synechocystis PCC6803 phycobilisomes. PHOTOSYNTHESIS RESEARCH 2024; 160:17-29. [PMID: 38407779 PMCID: PMC11006782 DOI: 10.1007/s11120-024-01078-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 01/18/2024] [Indexed: 02/27/2024]
Abstract
Phycobilisomes (PBs) play an important role in cyanobacterial photosynthesis. They capture light and transfer excitation energy to the photosynthetic reaction centres. PBs are also central to some photoprotective and photoregulatory mechanisms that help sustain photosynthesis under non-optimal conditions. Amongst the mechanisms involved in excitation energy dissipation that are activated in response to excessive illumination is a recently discovered light-induced mechanism that is intrinsic to PBs and has been the least studied. Here, we used single-molecule spectroscopy and developed robust data analysis methods to explore the role of a terminal emitter subunit, ApcE, in this intrinsic, light-induced mechanism. We isolated the PBs from WT Synechocystis PCC 6803 as well as from the ApcE-C190S mutant of this strain and compared the dynamics of their fluorescence emission. PBs isolated from the mutant (i.e., ApcE-C190S-PBs), despite not binding some of the red-shifted pigments in the complex, showed similar global emission dynamics to WT-PBs. However, a detailed analysis of dynamics in the core revealed that the ApcE-C190S-PBs are less likely than WT-PBs to enter quenched states under illumination but still fully capable of doing so. This result points to an important but not exclusive role of the ApcE pigments in the light-induced intrinsic excitation energy dissipation mechanism in PBs.
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Affiliation(s)
- Gonfa Tesfaye Assefa
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
| | - Joshua L Botha
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
| | - Bertus van Heerden
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
- National Institute for Theoretical and Computational Sciences (NITheCS), Stellenbosch, South Africa
| | - Farooq Kyeyune
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
- Department of Physics, Faculty of Science, Kyambogo University, P.O. Box 1, Kyambogo, Kampala, Uganda
| | - Tjaart P J Krüger
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa
- National Institute for Theoretical and Computational Sciences (NITheCS), Stellenbosch, South Africa
| | - Michal Gwizdala
- Department of Physics, University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa.
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Lynnwood Road, Pretoria, 0002, South Africa.
- ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain.
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Wahadoszamen M, Krüger TPJ, Ara AM, van Grondelle R, Gwizdala M. Charge transfer states in phycobilisomes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2020; 1861:148187. [PMID: 32173383 DOI: 10.1016/j.bbabio.2020.148187] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/17/2020] [Accepted: 03/09/2020] [Indexed: 10/24/2022]
Abstract
Phycobilisomes (PBs) absorb light and supply downstream photosynthetic processes with excitation energy in many cyanobacteria and algae. In response to a sudden increase in light intensity, excess excitation energy is photoprotectively dissipated in PBs by means of the orange carotenoid protein (OCP)-related mechanism or via a light-activated intrinsic decay channel. Recently, we have identified that both mechanisms are associated with far-red emission states. Here, we investigate the far-red states involved with the light-induced intrinsic mechanism by exploring the energy landscape and electro-optical properties of the pigments in PBs. While Stark spectroscopy showed that the far-red states in PBs exhibit a strong charge-transfer (CT) character at cryogenic temperatures, single molecule spectroscopy revealed that CT states should also be present at room temperature. Owing to the strong environmental sensitivity of CT states, the knowledge gained from this study may contribute to the design of a new generation of fluorescence markers.
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Affiliation(s)
- Md Wahadoszamen
- Department of Physics, University of Dhaka, Dhaka 1000, Bangladesh
| | - Tjaart P J Krüger
- Department of Physics, University of Pretoria, Pretoria 0023, South Africa
| | - Anjue Mane Ara
- Department of Physics, Jagannath University, Dhaka 1100, Bangladesh
| | - Rienk van Grondelle
- Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands
| | - Michal Gwizdala
- Department of Physics, University of Pretoria, Pretoria 0023, South Africa; Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands.
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Hoang HT, Haubitz T, Kumke MU. Photophysics of "Floppy" Dyads as Potential Biomembrane Probes. J Fluoresc 2018; 28:1225-1237. [PMID: 30145784 DOI: 10.1007/s10895-018-2286-4] [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: 04/19/2018] [Accepted: 08/20/2018] [Indexed: 01/26/2023]
Abstract
In the study a dyad (C6 probe), constructed of two dyes with highly different hydrophobicities, was investigated by steady-state and time-resolved spectroscopic techniques in chloroform, methanol, and in phospholipid vesicles, respectively. The dyad was built on two dyes: the lipophilic benzo[a]pyrene (BaP) and the hydrophilic sulforhodamine B (SRB). The dyes were linked via a short, but flexible alkyl chain (six C-atoms). Based on their spectroscopic properties, BaP and SRB showed a very efficient non-radiative resonance energy transfer in solution. Incorporation into a lipid bilayer limited the relative flexibility (degree of freedom) between donor and acceptor and was used for the investigation of fundamental photophysical aspects (especially of FRET) as well as to elucidate the potential of the dyad to probe the interface of vesicles (or cells). The location of the two dyes in vesicles and their respective accessibility for interactions with dye-specific antibodies was investigated. Based on the alteration of the anisotropy, on the rotational correlation time as well as on the diffusion coefficient the incorporation of the C6 probe into the vesicles was evaluated. Especially the limitation in the relative movements of the two dyes was considered and used to differentiate between potential parameters, that influence the energy transfer in the dyad. Transient absorption spectroscopy (TAS) and pulsed-interleave single molecule fluorescence experiments were performed to better understand the intramolecular interactions in the dyad. Finally, in a showcase for a biosensing application of the dyads, the binding of an SRB-specific antibody was investigated when the dyad was incorporated in vesicles. Graphical Abstract.
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Affiliation(s)
- Hoa T Hoang
- University of Potsdam, Institute of Chemistry (Physical Chemistry), Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany.,Humboldt University of Berlin, School of Analytical Sciences Adlershof (SALSA), Unter den Linden 6, 10099, Berlin, Germany
| | - Toni Haubitz
- University of Potsdam, Institute of Chemistry (Physical Chemistry), Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
| | - Michael U Kumke
- University of Potsdam, Institute of Chemistry (Physical Chemistry), Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany.
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Gao D, Aly SM, Karsenti PL, Harvey PD. What does it take to induce equilibrium in bidirectional energy transfers? Phys Chem Chem Phys 2018; 20:13682-13692. [PMID: 29745390 DOI: 10.1039/c7cp07879j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Two dyads built with a co-facial slipped bis(zinc(ii)porphyrin), a free base and a bridge, [Zn2]-bridge-[Fb] (bridge = C6H4C[triple bond, length as m-dash]C, 1 and C6H4C[triple bond, length as m-dash]CC6H4, 2), exhibit S1 energy equilibrium [Zn2]* ↔ [Fb]* at 298 K, an extremely rare situation, which depends on the degree of MO coupling between the units. At 77 K, 2 becomes bi-directional due to the two large C6H4-[Zn2] and C6H4-[Fb] dihedral angles.
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Affiliation(s)
- Di Gao
- Departement de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.
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Abstract
Atomically precise gold nanocluster based on linear assembly of repeating icosahedrons (clusters of clusters) is a unique type of linear nanostructure, which exhibits strong near-infrared absorption as their free electrons are confined in a one-dimensional quantum box. Little is known about the carrier dynamics in these nanoclusters, which limit their energy-related applications. Here, we reported the observation of exciton localization in triicosahedral Au37 nanoclusters (0.5 nm in diameter and 1.6 nm in length) by measuring femtosecond and nanosecond carrier dynamics. Upon photoexcitation to S1 electronic state, electrons in Au37 undergo ∼100-ps localization from the two vertexes of three icosahedrons to one vertex, forming a long-lived S1* state. Such phenomenon is not observed in Au25 (dimer) and Au13 (monomer) consisting of two and one icosahedrons, respectively. We have further observed temperature dependence on the localization process, which proves it is thermally driven. Two excited-state vibration modes with frequencies of 20 and 70 cm-1 observed in the kinetic traces are assigned to the axial and radial breathing modes, respectively. The electron localization is ascribed to the structural distortion of Au37 in the excited state induced by the strong coherent vibrations. The observed electron localization phenomenon provides unique physical insight into one-dimensional gold nanoclusters and other nanostructures, which will advance their applications in solar-energy storage and conversion.
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He G, Yu C, Li Y, Hu J, Liu Z, Zhang D, Guo Q, Xia A. Excitation Energy Transfer inmeta-Substituted Phenylacetylene Multibranched Chromophores. Chem Asian J 2016; 11:2741-2748. [DOI: 10.1002/asia.201600326] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 04/06/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Guiying He
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Chenmin Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Yang Li
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Jiangpu Hu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Zitong Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Deqing Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Laboratory of Organic Solid; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Qianjin Guo
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Andong Xia
- Beijing National Laboratory for Molecular Sciences (BNLMS) and; Key Laboratory of Photochemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
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Miao D, Ding WL, Zhao BQ, Lu L, Xu QZ, Scheer H, Zhao KH. Adapting photosynthesis to the near-infrared: non-covalent binding of phycocyanobilin provides an extreme spectral red-shift to phycobilisome core-membrane linker from Synechococcus sp. PCC7335. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:688-94. [DOI: 10.1016/j.bbabio.2016.03.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 03/10/2016] [Accepted: 03/31/2016] [Indexed: 12/11/2022]
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He G, Shao J, Li Y, Hu J, Zhu H, Wang X, Guo Q, Chi C, Xia A. Photophysical properties of octupolar triazatruxene-based chromophores. Phys Chem Chem Phys 2016; 18:6789-98. [DOI: 10.1039/c5cp07563g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The intramolecular charge transfer properties of tribranched chromophores related to their TPA properties are explored by estimating the TPA essential factors.
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Affiliation(s)
- Guiying He
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Jinjun Shao
- Department of Chemistry
- National University of Singapore
- Singapore
| | - Yang Li
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Jiangpu Hu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Huaning Zhu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Xian Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Qianjin Guo
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Chunyan Chi
- Department of Chemistry
- National University of Singapore
- Singapore
| | - Andong Xia
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Photochemistry, Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
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Li Y, He G, Wang X, Guo Q, Niu Y, Xia A. A Study of Excitation Delocalization/Localization in Multibranched Chromophores by Using Fluorescence Excitation Anisotropy Spectroscopy. Chemphyschem 2015; 17:406-11. [DOI: 10.1002/cphc.201501001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Yang Li
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
| | - Guiying He
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
| | - Xian Wang
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
| | - Qianjin Guo
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
| | - Yingli Niu
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
| | - Andong Xia
- Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences Department; Bejing 100190 China
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Dissecting pigment architecture of individual photosynthetic antenna complexes in solution. Proc Natl Acad Sci U S A 2015; 112:13880-5. [PMID: 26438850 DOI: 10.1073/pnas.1514027112] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oligomerization plays a critical role in shaping the light-harvesting properties of many photosynthetic pigment-protein complexes, but a detailed understanding of this process at the level of individual pigments is still lacking. To study the effects of oligomerization, we designed a single-molecule approach to probe the photophysical properties of individual pigment sites as a function of protein assembly state. Our method, based on the principles of anti-Brownian electrokinetic trapping of single fluorescent proteins, step-wise photobleaching, and multiparameter spectroscopy, allows pigment-specific spectroscopic information on single multipigment antennae to be recorded in a nonperturbative aqueous environment with unprecedented detail. We focus on the monomer-to-trimer transformation of allophycocyanin (APC), an important antenna protein in cyanobacteria. Our data reveal that the two chemically identical pigments in APC have different roles. One (α) is the functional pigment that red-shifts its spectral properties upon trimer formation, whereas the other (β) is a "protective" pigment that persistently quenches the excited state of α in the prefunctional, monomer state of the protein. These results show how subtleties in pigment organization give rise to functionally important aspects of energy transfer and photoprotection in antenna complexes. The method developed here should find immediate application in understanding the emergent properties of other natural and artificial light-harvesting systems.
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