1
|
Tsoraev GV, Protasova EA, Klimanova EA, Ryzhykau YL, Kuklin AI, Semenov YS, Ge B, Li W, Qin S, Friedrich T, Sluchanko NN, Maksimov EG. Anti-Stokes fluorescence excitation reveals conformational mobility of the C-phycocyanin chromophores. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2022; 9:054701. [PMID: 36065339 PMCID: PMC9440762 DOI: 10.1063/4.0000164] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 08/08/2022] [Indexed: 05/15/2023]
Abstract
The structural organization of natural pigment-protein complexes provides a specific environment for the chromophore groups. Yet, proteins are inherently dynamic and conformationally mobile. In this work, we demonstrate the heterogeneity of chromophores of C-phycocyanin (C-PC) from Arthrospira platensis. Part of the population of trimeric C-PC is subject to spontaneous disturbances of protein-protein interactions resulting in increased conformational mobility of the chromophores. Upon fluorescence excitation in the visible range, the spectral signatures of these poorly populated states are masked by bulk chromophore states, but the former could be clearly discriminated when the fluorescence is excited by near-infrared quanta. Such selective excitation of conformationally mobile C-PC chromophores is due to the structure of their S1 level, which is characterized by a significantly broadened spectral line. We demonstrate that the anti-Stokes C-PC fluorescence is the result of single-photon absorption. By combining spectral and structural methods, we characterize four distinct states of C-PC chromophores emitting at 620, 650, 665, and 720 nm and assigned the fast component in the anti-Stokes fluorescence decay kinetics in the range of 690-750 nm to the chromophores with increased conformational mobility. Our data suggest that the spectral and temporal characteristics of the anti-Stokes fluorescence can be used to study protein dynamics and develop methods to visualize local environment parameters such as temperature.
Collapse
Affiliation(s)
- Georgy V. Tsoraev
- Faculty of Biology, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Elena A. Protasova
- Faculty of Biology, Lomonosov Moscow State University, Moscow 119991, Russia
| | | | | | | | - Yury S. Semenov
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia
| | - Baosheng Ge
- China University of Petroleum (Huadong), College of Chemical Engineering, Qingdao 266580, People's Republic of China
| | - Wenjun Li
- Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, People's Republic of China
| | | | - Thomas Friedrich
- Technical University of Berlin, Institute of Chemistry PC 14, D-10623 Berlin, Germany
| | - Nikolai N. Sluchanko
- A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology of the Russian Academy of Sciences, Moscow 119071, Russia
| | - Eugene G. Maksimov
- Faculty of Biology, Lomonosov Moscow State University, Moscow 119991, Russia
- Author to whom correspondence should be addressed:. Tel.: +7 (926) 735–04-37
| |
Collapse
|
2
|
Non-Linear Spectroscopy of Carotenoid-Chlorophyll Interactions in Photosynthetic Light-Harvesting Complexes. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/978-3-642-32034-7_33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
3
|
Lokstein H, Betke A, Krikunova M, Teuchner K, Voigt B. Elucidation of structure-function relationships in plant major light-harvesting complex (LHC II) by nonlinear spectroscopy. PHOTOSYNTHESIS RESEARCH 2012; 111:227-235. [PMID: 22042329 DOI: 10.1007/s11120-011-9700-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 10/13/2011] [Indexed: 05/31/2023]
Abstract
Conventional linear and time-resolved spectroscopic techniques are often not appropriate to elucidate specific pigment-pigment interactions in light-harvesting pigment-protein complexes (LHCs). Nonlinear (laser-) spectroscopic techniques, including nonlinear polarization spectroscopy in the frequency domain (NLPF) as well as step-wise (resonant) and simultaneous (non-resonant) two-photon excitation spectroscopies may be advantageous in this regard. Nonlinear spectroscopies have been used to elucidate substructure(s) of very complex spectra, including analyses of strong excitonic couplings between chlorophylls and of interactions between (bacterio)chlorophylls and "optically dark" states of carotenoids in LHCs, including the major antenna complex of higher plants, LHC II. This article shortly reviews our previous study and outlines perspectives regarding the application of selected nonlinear laser-spectroscopic techniques to disentangle structure-function relationships in LHCs and other pigment-protein complexes.
Collapse
Affiliation(s)
- Heiko Lokstein
- Institut für Biochemie und Biologie/Pflanzenphysiologie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, Haus 20, 14476, Potsdam-Golm, Germany.
| | | | | | | | | |
Collapse
|