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Kawato S, Sato S, Kitoh-Nishioka H, Saga Y. Spectral changes of light-harvesting complex 2 lacking B800 bacteriochlorophyll a under neutral pH conditions. Photochem Photobiol Sci 2024:10.1007/s43630-024-00560-3. [PMID: 38564166 DOI: 10.1007/s43630-024-00560-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 03/05/2024] [Indexed: 04/04/2024]
Abstract
Exchange of B800 bacteriochlorophyll (BChl) a in light-harvesting complex 2 (LH2) is promising for a better understanding of the mechanism on intracomplex excitation energy transfer of this protein. Structural and spectroscopic properties of LH2 lacking B800 BChl a (B800-depleted LH2), which is an important intermediate protein in the B800 exchange, will be useful to tackle the energy transfer mechanism in LH2 by the B800 exchange strategy. In this study, we report a unique spectral change of B800-depleted LH2, in which the Qy absorption band of B800 BChl a is automatically recovered under neutral pH conditions. This spectral change was facilitated by factors for destabilization of LH2, namely, a detergent, lauryl dimethylamine N-oxide, and an increase in temperature. Spectral analyses in the preparation of an LH2 variant denoted as B800-recovered LH2 indicated that most BChl a that was released by decomposition of part of B800-depleted LH2 was a source of the production of B800-recovered LH2. Characterization of purified B800-recovered LH2 demonstrated that its spectroscopic and structural features was quite similar to those of native LH2. The current results indicate that the recovery of the B800 Qy band of B800-depleted LH2 originates from the combination of decomposition of part of B800-depleted LH2 and in situ reconstitution of BChl a into the B800 binding pockets of residual B800-depleted LH2, resulting in the formation of stable B800-recovered LH2.
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Affiliation(s)
- Shota Kawato
- Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Shinichi Sato
- Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Hirotaka Kitoh-Nishioka
- Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Yoshitaka Saga
- Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka, 577-8502, Japan.
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2
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Saga Y, Hamanishi K, Yamamoto T, Hinago K, Nagasawa Y. Conversion of B800 Bacteriochlorophyll a to 3-Acetyl Chlorophyll a in the Light-Harvesting Complex 3 by In Situ Oxidation. J Phys Chem B 2023; 127:2683-2689. [PMID: 36920317 DOI: 10.1021/acs.jpcb.2c08887] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
The spectral features of energy donors and acceptors and the relationship between them in photosynthetic light-harvesting proteins are crucial for photofunctions of these proteins. Engineering energy donors and acceptors in light-harvesting proteins affords the means to increase our understanding of their photofunctional mechanisms. Herein, we demonstrate the conversion of energy-donating B800 bacteriochlorophyll (BChl) a to 3-acetyl chlorophyll (AcChl) a in light-harvesting complex 3 (LH3) from Rhodoblastus acidophilus by in situ oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone. AcChl a in the B800 site exhibited a Qy band that was 111 nm blue-shifted with respect to BChl a in oxidized LH3. The structure of LH3 was barely influenced by the oxidation process, based on circular dichroism spectroscopy and size-exclusion chromatography evidence. In oxidized LH3, AcChl a transferred excitation energy to B820 BChl a, but the rate of excitation energy transfer (EET) was lower than in native LH3. The intracomplex EET in oxidized LH3 was slightly faster than in oxidized light-harvesting complex 2 (LH2). This difference is rationalized by an increase in overlap of the luminescence band of AcChl a with the long tail of the B820 absorption band in oxidized LH3 compared with that of the B850 band in oxidized LH2.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashio̅saka 577-8502, Osaka, Japan
| | - Kohei Hamanishi
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashio̅saka 577-8502, Osaka, Japan
| | - Tetsuya Yamamoto
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
| | - Kazuki Hinago
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
| | - Yutaka Nagasawa
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
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3
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Sutherland GA, Qian P, Hunter CN, Swainsbury DJ, Hitchcock A. Engineering purple bacterial carotenoid biosynthesis to study the roles of carotenoids in light-harvesting complexes. Methods Enzymol 2022; 674:137-184. [DOI: 10.1016/bs.mie.2022.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Saga Y, Tanaka A, Yamashita M, Shinoda T, Tomo T, Kimura Y. Spectral Properties of Chlorophyll f in the B800 Cavity of Light-harvesting Complex 2 from the Purple Photosynthetic Bacterium Rhodoblastus acidophilus. Photochem Photobiol 2021; 98:169-174. [PMID: 34293183 DOI: 10.1111/php.13491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/20/2021] [Accepted: 07/21/2021] [Indexed: 11/29/2022]
Abstract
The interactions of chlorophyll (Chl) and bacteriochlorophyll (BChl) pigments with the polypeptides in photosynthetic light-harvesting proteins are responsible for controlling the absorption energy of (B)Chls in protein matrixes. The binding pocket of B800 BChl a in LH2 proteins, which are peripheral light-harvesting proteins in purple photosynthetic bacteria, is useful for studying such structure-property relationships. We report the reconstitution of Chl f, which has the formyl group at the 2-position, in the B800 cavity of LH2 from the purple bacterium Rhodoblastus acidophilus. The Qy absorption band of Chl f in the B800 cavity was shifted by 14 nm to longer wavelength compared to that of the corresponding five-coordinated monomer in acetone. This redshift was larger than that of Chl a and Chl b. Resonance Raman spectroscopy indicated hydrogen bonding between the 2-formyl group of Chl f and the LH2 polypeptide. These results suggest that this hydrogen bonding contributes to the Qy redshift of Chl f. Furthermore, the Qy redshift of Chl f in the B800 cavity was smaller than that of Chl d. This may have arisen from the different patterns of hydrogen bonding between Chl f and Chl d and/or from the steric hindrance of the 3-vinyl group in Chl f.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Osaka, Japan
| | - Aiko Tanaka
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Osaka, Japan
| | - Madoka Yamashita
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Osaka, Japan
| | - Toshiyuki Shinoda
- Graduate School of Science, Tokyo University of Science, Tokyo, Japan
| | - Tatsuya Tomo
- Graduate School of Science, Tokyo University of Science, Tokyo, Japan
| | - Yukihiro Kimura
- Graduate School of Agricultural Science, Kobe University, Kobe, Japan
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5
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Saga Y, Otsuka Y, Tanaka A, Masaoka Y, Hidaka T, Nagasawa Y. Energy Transfer Dynamics in Light-Harvesting Complex 2 Variants Containing Oxidized B800 Bacteriochlorophyll a. J Phys Chem B 2021; 125:6830-6836. [PMID: 34139847 DOI: 10.1021/acs.jpcb.1c01592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Excitation energy transfer (EET) in light-harvesting proteins is vital for photosynthetic activities. The pigment compositions and their organizations in these proteins are responsible for the EET functions. Thus, changing the pigment compositions in light-harvesting proteins contributes to a better understanding of EET mechanisms. In this study, we investigated the EET dynamics of two light-harvesting complex 2 (LH2) variants, in which nine B800 bacteriochlorophyll (BChl) a pigments were entirely or half converted to 3-acetyl chlorophyll (AcChl) a. The AcChl a pigments showed a Qy band, which was blue-shifted by 107 nm from B800 BChl a in the two variants. EET from AcChl a to B850 BChl a was observed in both fully oxidized and half-oxidized LH2 variants, but the EET rates were lower than that from B800 to B850 BChl a. EET from AcChl a to the co-present B800 was barely detected in the half-oxidized LH2. The preferential EET from AcChl a to B850 instead of B800 was rationalized by little spectral overlap of AcChl a with B800 BChl a and the pigment geometry in the protein. The EET rate from B800 to B850 BChl a in the half-oxidized LH2 was analogous to that in native LH2, indicating that partial oxidation of B800 did not disturb the EET channel from the residual B800 to B850.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuji Otsuka
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Aiko Tanaka
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuto Masaoka
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Tsubasa Hidaka
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Yutaka Nagasawa
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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6
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Trempe A, Levenberg A, Ortega ADG, Lujan MA, Picorel R, Zazubovich V. Effects of Chlorophyll Triplet States on the Kinetics of Spectral Hole Growth. J Phys Chem B 2021; 125:3278-3285. [PMID: 33764072 DOI: 10.1021/acs.jpcb.0c09042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Spectral hole burning has been employed for decades to study various amorphous solids and proteins. Triplet states and respective transient holes were incorporated into theoretical models and software simulating nonphotochemical spectral hole burning (NPHB) and including all relevant distributions, in particular the distribution of the angle between the electric field of light E and transient dipole moment of the chromophore μ. The presence of a chlorophyll a triplet state with a lifetime of several milliseconds explains the slowdown of NPHB (on the depth vs illumination dose scale) with the increase of the light intensity, as well as larger hole depths observed in weak probe beam experiments, compared to those deduced from the hole growth kinetics (HGK) measurements (signal collected at a fixed wavelength while a stronger burning beam is on) in cytochrome b6f and chemically modified LH2. We also considered the solvent deuteration effects on triplet lifetime and concluded that both triplet states and local heating likely play a role in slowing down the HGK with increasing burn intensity.
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Affiliation(s)
- Alexandra Trempe
- Department of Physics, Concordia University, 7141 Sherbrooke Str. West, Montreal, Quebec H4B 1R6, Canada
| | - Alexander Levenberg
- Department of Physics, Concordia University, 7141 Sherbrooke Str. West, Montreal, Quebec H4B 1R6, Canada
| | | | - Maria A Lujan
- Estacion Experimental de Aula Dei (CSIC), Avda. Montañana 1005, Zaragoza 50059, Spain
| | - Rafael Picorel
- Estacion Experimental de Aula Dei (CSIC), Avda. Montañana 1005, Zaragoza 50059, Spain
| | - Valter Zazubovich
- Department of Physics, Concordia University, 7141 Sherbrooke Str. West, Montreal, Quebec H4B 1R6, Canada
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7
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Saga Y, Yamashita M, Masaoka Y, Hidaka T, Imanishi M, Kimura Y, Nagasawa Y. Excitation Energy Transfer from Bacteriochlorophyll b in the B800 Site to B850 Bacteriochlorophyll a in Light-Harvesting Complex 2. J Phys Chem B 2021; 125:2009-2017. [PMID: 33605728 DOI: 10.1021/acs.jpcb.0c09605] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Control of the spectral overlap between energy donors and acceptors provides insight into excitation energy transfer (EET) mechanisms in photosynthetic light-harvesting proteins. Substitution of energy-donating B800 bacteriochlorophyll (BChl) a with other pigments in the light-harvesting complex 2 (LH2) of purple photosynthetic bacteria has been extensively performed; however, most studies on the B800 substitution have focused on the decrease in the spectral overlap integral with energy-accepting B850 BChl a by reconstitution of chlorophylls into the B800 site. Here, we reconstitute BChl b into the B800 site of the LH2 protein from Rhodoblastus acidophilus to increase the spectral overlap with B850 BChl a. BChl b in the B800 site had essentially the same hydrogen-bonding pattern as B800 BChl a, whereas it showed a red-shifted Qy absorption band at 831 nm. The EET rate from BChl b to B850 BChl a in the reconstituted LH2 was similar to that of native LH2 despite the red shift of the Qy band of the energy donor. These results demonstrate the importance of the contribution of the density of excitation states of the B850 circular assembly, which incorporates higher lying optically forbidden states, to intracomplex EET in LH2.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Madoka Yamashita
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuto Masaoka
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Tsubasa Hidaka
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Michie Imanishi
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Yukihiro Kimura
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Yutaka Nagasawa
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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8
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Effects of palladium ions on light-harvesting complex 2 lacking B800 bacteriochlorophyll a. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Niedzwiedzki DM, Swainsbury DJK, Hunter CN. Carotenoid-to-(bacterio)chlorophyll energy transfer in LH2 antenna complexes from Rba. sphaeroides reconstituted with non-native (bacterio)chlorophylls. PHOTOSYNTHESIS RESEARCH 2020; 144:155-169. [PMID: 31350671 PMCID: PMC7203092 DOI: 10.1007/s11120-019-00661-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 07/16/2019] [Indexed: 05/04/2023]
Abstract
Six variants of the LH2 antenna complex from Rba. sphaeroides, comprising the native B800-B850, B800-free LH2 (B850) and four LH2s with various (bacterio)chlorophylls reconstituted into the B800 site, have been investigated with static and time-resolved optical spectroscopies at room temperature and at 77 K. The study particularly focused on how reconstitution of a non-native (bacterio)chlorophylls affects excitation energy transfer between the naturally bound carotenoid spheroidene and artificially substituted pigments in the B800 site. Results demonstrate there is no apparent trend in the overall energy transfer rate from spheroidene to B850 bacteriochlorophyll a; however, a trend in energy transfer rate from the spheroidene S1 state to Qy of the B800 (bacterio)chlorophylls is noticeable. These outcomes were applied to test the validity of previously proposed energy values of the spheroidene S1 state, supporting a value in the vicinity of 13,400 cm-1 (746 nm).
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Affiliation(s)
- Dariusz M Niedzwiedzki
- Center for Solar Energy and Energy Storage, Washington University, St. Louis, MO, 63130, USA.
- Department of Energy, Environmental & Chemical Engineering, Washington University, St. Louis, MO, 63130, USA.
| | - David J K Swainsbury
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK
| | - C Neil Hunter
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK
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10
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Saga Y, Yamashita M, Imanishi M, Kimura Y, Masaoka Y, Hidaka T, Nagasawa Y. Reconstitution of 3-Acetyl Chlorophyll a into Light-Harvesting Complex 2 from the Purple Photosynthetic Bacterium Phaeospirillum molischianum. ACS OMEGA 2020; 5:6817-6825. [PMID: 32258917 PMCID: PMC7114761 DOI: 10.1021/acsomega.0c00152] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 03/06/2020] [Indexed: 06/11/2023]
Abstract
The manipulation of B800 bacteriochlorophyll (BChl) a in light-harvesting complex 2 (LH2) from the purple photosynthetic bacterium Phaeospirillum molischianum (molischianum-LH2) provides insight for understanding the energy transfer mechanism and the binding of cyclic tetrapyrroles in LH2 proteins since molischianum-LH2 is one of the two LH2 proteins whose atomic-resolution structures have been determined and is a representative of type-2 LH2 proteins. However, there is no report on the substitution of B800 BChl a in molischianum-LH2. We report the reconstitution of 3-acetyl chlorophyll (AcChl) a, which has a 17,18-dihydroporphyrin skeleton, to the B800 site in molischianum-LH2. The 3-acetyl group in AcChl a formed a hydrogen bond with β'-Thr23 in essentially the same manner as native B800 BChl a, but this hydrogen bond was weaker than that of B800 BChl a. This change can be rationalized by invoking a small distortion in the orientation of the 3-acetyl group in the B800 cavity by dehydrogenation in the B-ring from BChl a. The energy transfer from AcChl a in the B800 site to B850 BChl a was about 5-fold slower than that from native B800 BChl a by a decrease of the spectral overlap between energy-donating AcChl a and energy-accepting B850 BChl a.
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Affiliation(s)
- Yoshitaka Saga
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka 577-8502, Osaka, Japan
| | - Madoka Yamashita
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka 577-8502, Osaka, Japan
| | - Michie Imanishi
- Graduate
School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Yukihiro Kimura
- Graduate
School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Yuto Masaoka
- Graduate
School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
| | - Tsubasa Hidaka
- Graduate
School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
| | - Yutaka Nagasawa
- Graduate
School of Life Sciences, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan
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11
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Yoneda Y, Kato D, Kondo M, Nagashima KVP, Miyasaka H, Nagasawa Y, Dewa T. Sequential energy transfer driven by monoexponential dynamics in a biohybrid light-harvesting complex 2 (LH2). PHOTOSYNTHESIS RESEARCH 2020; 143:115-128. [PMID: 31620983 DOI: 10.1007/s11120-019-00677-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 09/24/2019] [Indexed: 06/10/2023]
Abstract
Enhancing the light-harvesting potential of antenna components in a system of solar energy conversion is an important topic in the field of artificial photosynthesis. We constructed a biohybrid light-harvesting complex 2 (LH2) engineered from Rhodobacter sphaeroides IL106 strain. An artificial fluorophore Alexa Fluor 647 maleimide (A647) was attached to the LH2 bearing cysteine residue at the N-terminal region (LH2-NC) near B800 bacteriochlorophyll a (BChl) assembly. The A647-attached LH2-NC conjugate (LH2-NC-A647) preserved the integrity of the intrinsic chromophores, B800- and B850-BChls, and carotenoids. Femtosecond transient absorption spectroscopy revealed that the sequential energy transfer A647 → B800 → B850 occurs at time scale of 9-10 ps with monoexponential dynamics in micellar and lipid bilayer systems. A B800-removed conjugate (LH2-NC[B800(-)]-A647) exhibited a significant decrease in energy transfer efficiency in the micellar system; however, surprisingly, direct energy transfer from A647 to B850 was observed at a rate comparable to that for LH2-NC-A647. This result implies that the energy transfer pathway is modified after B800 removal. The results obtained suggested that a LH2 complex is a potential platform for construction of biohybrid light-harvesting materials with simple energy transfer dynamics through the site-selective attachment of the external antennae and the modifiable energy-funnelling pathway.
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Affiliation(s)
- Yusuke Yoneda
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Daiji Kato
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan
| | - Masaharu Kondo
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan
| | - Kenji V P Nagashima
- Research Institute for Integrated Science, Kanagawa University, Kanagawa, 259-1293, Japan
| | - Hiroshi Miyasaka
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Yutaka Nagasawa
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan.
| | - Takehisa Dewa
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
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12
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Saga Y, Yamashita M, Nakagawa S. In situ Conversion of Chlorophyll b Reconstituted into Photosynthetic Protein LH2. CHEM LETT 2019. [DOI: 10.1246/cl.190545] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Madoka Yamashita
- Department of Chemistry, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Shiori Nakagawa
- Department of Chemistry, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
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13
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Rätsep M, Linnanto JM, Freiberg A. Higher Order Vibronic Sidebands of Chlorophyll a and Bacteriochlorophyll a for Enhanced Excitation Energy Transfer and Light Harvesting. J Phys Chem B 2019; 123:7149-7156. [PMID: 31356081 DOI: 10.1021/acs.jpcb.9b06843] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Optical absorption and fluorescence spectra of molecules in condensed phases often show extensive sidebands. Originating from electron-vibrational and electron-phonon couplings, these spectral tails bear important information on the dynamics of electronic states and processes the molecules are involved in. The vibronic sidebands observed in conjugate Qy absorption and fluorescence spectra of chlorophyll a and bacteriochlorophyll a are relatively weak, characterized by the total Huang-Rhys factor which is less than one. Therefore, it is widely considered that only fundamental intramolecular modes are responsible for their formation. Here, we provide evidence for extra-long and structured fluorescence tails of chlorophyll a and bacteriochlorophyll a as far as 4000 cm-1 from respective spectral origins, far beyond the frequency range of fundamental modes. According to quantum chemical simulations, these sidebands extending to ∼960 nm in chlorophyll a and ∼1140 nm in bacteriochlorophyll a into the infrared part of the optical spectrum are mainly contributed to by vibrational overtones of the fundamental modes. Because energy transfer and relaxation processes generally depend on vibronic overlap integrals, these findings potentially contribute to better understanding of many vital photo-induced phenomena, including photosynthetic light harvesting.
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Affiliation(s)
- Margus Rätsep
- Institute of Physics , University of Tartu , W. Ostwald Street 1 , 50411 Tartu , Estonia
| | - Juha Matti Linnanto
- Institute of Physics , University of Tartu , W. Ostwald Street 1 , 50411 Tartu , Estonia
| | - Arvi Freiberg
- Institute of Physics , University of Tartu , W. Ostwald Street 1 , 50411 Tartu , Estonia.,Institute of Molecular and Cell Biology , University of Tartu , Riia 23 , 51010 Tartu , Estonia.,Estonian Academy of Sciences , Kohtu 6 , 10130 Tallinn , Estonia
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14
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Selective oxidation of B800 bacteriochlorophyll a in photosynthetic light-harvesting protein LH2. Sci Rep 2019; 9:3636. [PMID: 30842503 PMCID: PMC6403449 DOI: 10.1038/s41598-019-40082-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 02/04/2019] [Indexed: 11/15/2022] Open
Abstract
Engineering chlorophyll (Chl) pigments that are bound to photosynthetic light-harvesting proteins is one promising strategy to regulate spectral coverage for photon capture and to improve the photosynthetic efficiency of these proteins. Conversion from the bacteriochlorophyll (BChl) skeleton (7,8,17,18-tetrahydroporphyrin) to the Chl skeleton (17,18-dihydroporphyrin) produces the most drastic change of the spectral range of absorption by light-harvesting proteins. We demonstrated in situ selective oxidation of B800 BChl a in light-harvesting protein LH2 from a purple bacterium Rhodoblastus acidophilus by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone. The newly formed pigment, 3-acetyl Chl a, interacted with the LH2 polypeptides in the same manner as native B800. B850 BChl a was not oxidized in this reaction. CD spectroscopy indicated that the B850 orientation and the content of the α-helices were unchanged by the B800 oxidation. The nonameric circular arrangement of the oxidized LH2 protein was visualized by AFM; its diameter was almost the same as that of native LH2. The in situ oxidation of B800 BChl a in LH2 protein with no structural change will be useful not only for manipulation of the photofunctional properties of photosynthetic pigment-protein complexes but also for understanding the substitution of BChl to Chl pigments in the evolution from bacterial to oxygenic photosynthesis.
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15
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Efficient Culture of Rhodopseudomonas Palustris Using Landfill Leachate. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2018. [DOI: 10.22207/jpam.12.4.01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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16
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Engineering of B800 bacteriochlorophyll binding site specificity in the Rhodobacter sphaeroides LH2 antenna. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1860:209-223. [PMID: 30414933 PMCID: PMC6358721 DOI: 10.1016/j.bbabio.2018.11.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/19/2018] [Accepted: 11/07/2018] [Indexed: 11/22/2022]
Abstract
The light-harvesting 2 complex (LH2) of the purple phototrophic bacterium Rhodobacter sphaeroides is a highly efficient, light-harvesting antenna that allows growth under a wide-range of light intensities. In order to expand the spectral range of this antenna complex, we first used a series of competition assays to measure the capacity of the non-native pigments 3-acetyl chlorophyll (Chl) a, Chl d, Chl f or bacteriochlorophyll (BChl) b to replace native BChl a in the B800 binding site of LH2. We then adjusted the B800 site and systematically assessed the binding of non-native pigments. We find that Arg-10 of the LH2 β polypeptide plays a crucial role in binding specificity, by providing a hydrogen-bond to the 3-acetyl group of native and non-native pigments. Reconstituted LH2 complexes harbouring the series of (B)Chls were examined by transient absorption and steady-state fluorescence spectroscopies. Although slowed 10-fold to ~6 ps, energy transfer from Chl a to B850 BChl a remained highly efficient. We measured faster energy-transfer time constants for Chl d (3.5 ps) and Chl f (2.7 ps), which have red-shifted absorption maxima compared to Chl a. BChl b, red-shifted from the native BChl a, gave extremely rapid (≤0.1 ps) transfer. These results show that modified LH2 complexes, combined with engineered (B)Chl biosynthesis pathways in vivo, have potential for retaining high efficiency whilst acquiring increased spectral range.
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17
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Saga Y, Yamashita M, Imanishi M, Kimura Y. Reconstitution of Chlorophyll d into the Bacterial Photosynthetic Light-harvesting Protein LH2. CHEM LETT 2018. [DOI: 10.1246/cl.180483] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Madoka Yamashita
- Department of Chemistry, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Michie Imanishi
- Graduate School of Agricultural Science, Kobe University, Kobe, Hyogo 657-8501, Japan
| | - Yukihiro Kimura
- Graduate School of Agricultural Science, Kobe University, Kobe, Hyogo 657-8501, Japan
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18
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Saga Y, Hirota K, Matsui S, Asakawa H, Ishikita H, Saito K. Selective Removal of B800 Bacteriochlorophyll a from Light-Harvesting Complex 2 of the Purple Photosynthetic Bacterium Phaeospirillum molischianum. Biochemistry 2018; 57:3075-3083. [PMID: 29771536 DOI: 10.1021/acs.biochem.8b00259] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The selective removal of B800 bacteriochlorophyll (BChl) a from light-harvesting complex 2 (LH2) in purple photosynthetic bacteria is a clue about elucidation of the mechanism for the transfer of energy from these pigments to B850 BChl a and their roles in the LH2 protein structure. We demonstrated that the kinetics of the removal of B800 BChl a from two representative LH2 proteins derived from Phaeospirillum molischianum and Rhodoblastus acidophilus differed significantly, in contrast to the calculated binding enthalpy. These results may be interpreted as changes in the local structure near B800 BChl a with respect to the geometries of the original crystal structures upon removal of B800 BChl a. Despite the difficulty of removing B800 BChl a from molischianum-LH2, we prepared the molischianum-LH2 protein lacking B800 BChl a by combination of two detergents, n-dodecyl β-d-maltoside and n-octyl β-d-glucoside, under acidic conditions. Spectral and atomic force microscopy analyses indicated that the absence of B800 BChl a had little effect on the local structure in the vicinity of B850 BChl a and the circular arrangement in this protein. These results suggest that the hydrophobic domain near B850 BChl a is rigid and plays a major role in the structural formation of molischianum-LH2.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering , Kindai University , Higashi-Osaka, Osaka 577-8502 , Japan.,Precursory Research for Embryonic Science and Technology , Japan Science and Technology Agency , Kawaguchi , Saitama 332-0012 , Japan
| | - Keiya Hirota
- Department of Chemistry, Faculty of Science and Engineering , Kindai University , Higashi-Osaka, Osaka 577-8502 , Japan
| | - Sayaka Matsui
- Graduate School of Natural Science and Technology , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Hitoshi Asakawa
- Precursory Research for Embryonic Science and Technology , Japan Science and Technology Agency , Kawaguchi , Saitama 332-0012 , Japan.,Graduate School of Natural Science and Technology , Kanazawa University , Kanazawa 920-1192 , Japan.,Bio-AFM Frontier Research Center , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Hiroshi Ishikita
- Department of Applied Chemistry , The University of Tokyo , Bunkyo-ku, Tokyo 113-8654 , Japan.,Research Center for Advanced Science and Technology , The University of Tokyo , Meguro-ku, Tokyo 153-8904 , Japan
| | - Keisuke Saito
- Department of Applied Chemistry , The University of Tokyo , Bunkyo-ku, Tokyo 113-8654 , Japan.,Research Center for Advanced Science and Technology , The University of Tokyo , Meguro-ku, Tokyo 153-8904 , Japan
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19
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Saga Y, Miyagi K. Characterization of 3-Acetyl Chlorophyllaand 3-Acetyl ProtochlorophyllaAccommodated in the B800 Binding Sites of Photosynthetic Light-Harvesting Complex 2 in the Purple Photosynthetic BacteriumRhodoblastus acidophilus. Photochem Photobiol 2018; 94:698-704. [DOI: 10.1111/php.12919] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 03/15/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry; Faculty of Science and Engineering; Kindai University; Higashi-Osaka, Osaka Japan
- Precursory Research for Embryonic Science and Technology; Japan Science and Technology Agency; Kawaguchi Saitama Japan
| | - Kanji Miyagi
- Department of Chemistry; Faculty of Science and Engineering; Kindai University; Higashi-Osaka, Osaka Japan
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20
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Ogren JI, Tong AL, Gordon SC, Chenu A, Lu Y, Blankenship RE, Cao J, Schlau-Cohen GS. Impact of the lipid bilayer on energy transfer kinetics in the photosynthetic protein LH2. Chem Sci 2018; 9:3095-3104. [PMID: 29732092 PMCID: PMC5914429 DOI: 10.1039/c7sc04814a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/05/2018] [Indexed: 01/28/2023] Open
Abstract
Photosynthetic purple bacteria convert solar energy to chemical energy with near unity quantum efficiency. The light-harvesting process begins with absorption of solar energy by an antenna protein called Light-Harvesting Complex 2 (LH2). Energy is subsequently transferred within LH2 and then through a network of additional light-harvesting proteins to a central location, termed the reaction center, where charge separation occurs. The energy transfer dynamics of LH2 are highly sensitive to intermolecular distances and relative organizations. As a result, minor structural perturbations can cause significant changes in these dynamics. Previous experiments have primarily been performed in two ways. One uses non-native samples where LH2 is solubilized in detergent, which can alter protein structure. The other uses complex membranes that contain multiple proteins within a large lipid area, which make it difficult to identify and distinguish perturbations caused by protein-protein interactions and lipid-protein interactions. Here, we introduce the use of the biochemical platform of model membrane discs to study the energy transfer dynamics of photosynthetic light-harvesting complexes in a near-native environment. We incorporate a single LH2 from Rhodobacter sphaeroides into membrane discs that provide a spectroscopically amenable sample in an environment more physiological than detergent but less complex than traditional membranes. This provides a simplified system to understand an individual protein and how the lipid-protein interaction affects energy transfer dynamics. We compare the energy transfer rates of detergent-solubilized LH2 with those of LH2 in membrane discs using transient absorption spectroscopy and transient absorption anisotropy. For one key energy transfer step in LH2, we observe a 30% enhancement of the rate for LH2 in membrane discs compared to that in detergent. Based on experimental results and theoretical modeling, we attribute this difference to tilting of the peripheral bacteriochlorophyll in the B800 band. These results highlight the importance of well-defined systems with near-native membrane conditions for physiologically-relevant measurements.
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Affiliation(s)
- John I Ogren
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Ashley L Tong
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Samuel C Gordon
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Aurélia Chenu
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Yue Lu
- Department of Biology and Chemistry , Washington University in St. Louis , St. Louis , MO 63130 , USA
| | - Robert E Blankenship
- Department of Biology and Chemistry , Washington University in St. Louis , St. Louis , MO 63130 , USA
| | - Jianshu Cao
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Gabriela S Schlau-Cohen
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
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21
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Insertion of chlorophyll a derivatives into the binding sites of B800 bacteriochlorophyll a in light-harvesting complex 2 from the purple photosynthetic bacterium Rhodoblastus acidophilus. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.07.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Saga Y, Hirota K, Asakawa H, Takao K, Fukuma T. Reversible Changes in the Structural Features of Photosynthetic Light-Harvesting Complex 2 by Removal and Reconstitution of B800 Bacteriochlorophyll a Pigments. Biochemistry 2017; 56:3484-3491. [DOI: 10.1021/acs.biochem.7b00267] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yoshitaka Saga
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
- Precursory
Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Keiya Hirota
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Hitoshi Asakawa
- Precursory
Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
- Bio-AFM
Frontier Research Center, Kanazawa University, Kanazawa 920-1192, Japan
| | - Kazufumi Takao
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
| | - Takeshi Fukuma
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
- Bio-AFM
Frontier Research Center, Kanazawa University, Kanazawa 920-1192, Japan
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23
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Wen S, Liu H, He H, Luo L, Li X, Zeng G, Zhou Z, Lou W, Yang C. Treatment of anaerobically digested swine wastewater by Rhodobacter blasticus and Rhodobacter capsulatus. BIORESOURCE TECHNOLOGY 2016; 222:33-38. [PMID: 27697735 DOI: 10.1016/j.biortech.2016.09.102] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/21/2016] [Accepted: 09/25/2016] [Indexed: 05/28/2023]
Abstract
Two strains of photosynthetic bacteria, Rhodobacter blasticus and Rhodobacter capsulatus, were used in this work to investigate the feasibility of using photosynthetic bacteria for the treatment of anaerobically digested swine wastewater. The effects of crucial factors which influence the pollutants removal efficiency were also examined. Results showed that anaerobically digested swine wastewater could be treated effectively by photosynthetic bacteria. The treatment efficiency was significantly higher by the mixed photosynthetic bacteria than that by any unitary bacterium. The optimal treatment condition by mixed bacteria was inoculation of 10.0%(v/v) of the two bacteria by 1:1, initial pH of 7.0 and initial chemical oxygen demand of 4800mgL-1. Under these conditions, the removal rate of chemical oxygen demand was 83.3%, which was 19.3% higher than when using Rhodobacter blasticus or 10.6% higher than when using Rhodobacter capsulatus separately. This mixed photosynthetic bacteria achieved high chemical oxygen demand removal and cell yields.
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Affiliation(s)
- Shan Wen
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Hongyu Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Huijun He
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Le Luo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xiang Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zili Zhou
- Hunan Hikee Environmental Technology Co., Ltd., Changsha 410001, PR China
| | - Wei Lou
- Hunan Hikee Environmental Technology Co., Ltd., Changsha 410001, PR China
| | - Chunping Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
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24
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Senge MO, MacGowan SA, O'Brien JM. Conformational control of cofactors in nature - the influence of protein-induced macrocycle distortion on the biological function of tetrapyrroles. Chem Commun (Camb) 2016; 51:17031-63. [PMID: 26482230 DOI: 10.1039/c5cc06254c] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Tetrapyrrole-containing proteins are one of the most fundamental classes of enzymes in nature and it remains an open question to give a chemical rationale for the multitude of biological reactions that can be catalyzed by these pigment-protein complexes. There are many fundamental processes where the same (i.e., chemically identical) porphyrin cofactor is involved in chemically quite distinct reactions. For example, heme is the active cofactor for oxygen transport and storage (hemoglobin, myoglobin) and for the incorporation of molecular oxygen in organic substrates (cytochrome P450). It is involved in the terminal oxidation (cytochrome c oxidase) and the metabolism of H2O2 (catalases and peroxidases) and catalyzes various electron transfer reactions in cytochromes. Likewise, in photosynthesis the same chlorophyll cofactor may function as a reaction center pigment (charge separation) or as an accessory pigment (exciton transfer) in light harvesting complexes (e.g., chlorophyll a). Whilst differences in the apoprotein sequences alone cannot explain the often drastic differences in physicochemical properties encountered for the same cofactor in diverse protein complexes, a critical factor for all biological functions must be the close structural interplay between bound cofactors and the respective apoprotein in addition to factors such as hydrogen bonding or electronic effects. Here, we explore how nature can use the same chemical molecule as a cofactor for chemically distinct reactions using the concept of conformational flexibility of tetrapyrroles. The multifaceted roles of tetrapyrroles are discussed in the context of the current knowledge on distorted porphyrins. Contemporary analytical methods now allow a more quantitative look at cofactors in protein complexes and the development of the field is illustrated by case studies on hemeproteins and photosynthetic complexes. Specific tetrapyrrole conformations are now used to prepare bioengineered designer proteins with specific catalytic or photochemical properties.
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Affiliation(s)
- Mathias O Senge
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin 2, Ireland and Medicinal Chemistry, Institute of Molecular Medicine, Trinity Centre for Health Sciences, Trinity College Dublin, St. James's Hospital, Dublin 8, Ireland.
| | - Stuart A MacGowan
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Jessica M O'Brien
- Medicinal Chemistry, Institute of Molecular Medicine, Trinity Centre for Health Sciences, Trinity College Dublin, St. James's Hospital, Dublin 8, Ireland.
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25
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Shibuya Y, Itoh T, Matsuura SI, Yamaguchi A. Structural Stability of Light-harvesting Protein LH2 Adsorbed on Mesoporous Silica Supports. ANAL SCI 2015; 31:1069-74. [PMID: 26460373 DOI: 10.2116/analsci.31.1069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the present study, we examined the reversible thermal deformation of the membrane protein light-harvesting complex LH2 adsorbed on mesoporous silica (MPS) supports. The LH2 complex from Thermochromatium tepidum cells was conjugated to MPS supports with a series of pore diameter (2.4 to 10.6 nm), and absorption spectra of the resulting LH2/MPS conjugates were observed over a temperature range of 273 - 313 K in order to examine the structure of the LH2 adsorbed on the MPS support. The experimental results confirmed that a slight ellipsoidal deformation of LH2 was induced by adsorption on the MPS supports. On the other hand, the structural stability of LH2 was not perturbed by the adsorption. Since the pore diameter of MPS support did not influence the structural stability of LH2, it could be considered that the spatial confinement of LH2 in size-matches pore did not improve the structural stability of LH2.
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26
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Yoneda Y, Noji T, Katayama T, Mizutani N, Komori D, Nango M, Miyasaka H, Itoh S, Nagasawa Y, Dewa T. Extension of Light-Harvesting Ability of Photosynthetic Light-Harvesting Complex 2 (LH2) through Ultrafast Energy Transfer from Covalently Attached Artificial Chromophores. J Am Chem Soc 2015; 137:13121-9. [DOI: 10.1021/jacs.5b08508] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yusuke Yoneda
- Graduate
School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Tomoyasu Noji
- Department
of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
- The OCU Advanced Research Institute for Natural Science & Technology (OCARINA), Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tetsuro Katayama
- Institute
for NanoScience Design, Osaka University, Toyonaka, Osaka 560-8531, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Naoto Mizutani
- Department
of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
| | - Daisuke Komori
- Department
of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
| | - Mamoru Nango
- Department
of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
- The OCU Advanced Research Institute for Natural Science & Technology (OCARINA), Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Hiroshi Miyasaka
- Graduate
School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Shigeru Itoh
- Center for
Gene Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Yutaka Nagasawa
- Graduate
School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Takehisa Dewa
- Department
of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
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27
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Yang F, Yu LJ, Wang P, Ai XC, Wang ZY, Zhang JP. Effects of Aggregation on the Excitation Dynamics of LH2 from Thermochromatium tepidum in Aqueous Phase and in Chromatophores. J Phys Chem B 2011; 115:7906-13. [DOI: 10.1021/jp1097537] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fan Yang
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Repulic of China
- College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China
| | - Long-Jiang Yu
- Faculty of Science, Ibaraki University, Mito 310-8512, Japan
| | - Peng Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Repulic of China
| | - Xi-Cheng Ai
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Repulic of China
| | - Zheng-Yu Wang
- Faculty of Science, Ibaraki University, Mito 310-8512, Japan
| | - Jian-Ping Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Repulic of China
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28
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Jailaubekov AE, Song SH, Vengris M, Cogdell RJ, Larsen DS. Using narrowband excitation to confirm that the S∗ state in carotenoids is not a vibrationally-excited ground state species. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.01.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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29
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Feng J, Li X, Liu Y. Effects of pH on the peripheral light-harvesting antenna complex for Rhodopseudomonas palustris. SCIENCE IN CHINA. SERIES C, LIFE SCIENCES 2008; 51:760-766. [PMID: 18677604 DOI: 10.1007/s11427-008-0093-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Accepted: 05/21/2008] [Indexed: 05/26/2023]
Abstract
In this work steady-state absorption spectroscopy, circular dichroism spectroscopy and sub-microsecond time-resolved absorption spectroscopy were used to investigate the effect of pH on the structures and functions of LH2 complex for Rhodopseudomonas palustris. The results revealed that: (1) B800 Bchla was gradually transformed to free pigments absorbing around 760 nm on the minutes timescale upon the induction of strong acidic pH, and subsequently there disappeared the CD signal for Q(y) band of B800 in the absence of B800. In addition, Carotenoids changed with the similar tendency to B850 BChl. (2) The introduction of strong basic pH gave rise to no significant changes for B800 Bchla, while B850 BChla experienced remarkable spectral blue-shift from 852 to 837 nm. Similar phenomenon was seen for the CD signal for Q(y) band of B850. Carotenoids displayed strong and pH-independent CD signals in the visible range. (3) In the case of both physiological and basic pH, broad and asymmetrical positive T( n ) <-- T(1) transient absorption appeared following the pulsed photo-excitation of Car at 532 nm. By contrast, the featureless and weak positive signal was observed on the sub-microsecond timescale in the acidic pH environment. The aforementioned experimental results indicated that acidic pH-induced removal of B800 Bchla prevented the generation of the carotenoid triplet state ((3)Car), which is known to be essential for the photo-protection function. Nevertheless, carotenoids can still perform this important physiological role under the basic pH condition, where the spectral blue shift of B850 exerts little effect on the overall structure of the cyclic aggregate, therefore favoring the formation of carotenoid triplet state.
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Affiliation(s)
- Juan Feng
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China.
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30
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Polívka T, Niedzwiedzki D, Fuciman M, Sundström V, Frank HA. Role of B800 in Carotenoid−Bacteriochlorophyll Energy and Electron Transfer in LH2 Complexes from the Purple BacteriumRhodobactersphaeroides. J Phys Chem B 2007; 111:7422-31. [PMID: 17547450 DOI: 10.1021/jp071395c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The role of the B800 in energy and electron transfer in LH2 complexes has been studied using femtosecond time-resolved transient absorption spectroscopy. The B800 site was perturbed by application of lithium dodecyl sulfate (LDS), and comparison of treated and untreated LH2 complexes from Rhodobacter sphaeroides incorporating carotenoids neurosporene, spheroidene, and spheroidenone was used to explore the role of B800 in carotenoid to bacteriochlorophyll-a (BChla) energy transfer and carotenoid radical formation. Efficiencies of the S1-mediated energy transfer in the LDS-treated complexes were 86, 61, and 57% in the LH2 complexes containing neurosporene, spheroidene, and spheroidenone, respectively. Analysis of the carotenoid S1 lifetimes in solution, LDS-treated, and untreated LH2 complexes allowed determination of B800/B850 branching ratio in the S1-mediated energy transfer. It is shown that B800 is a major acceptor, as approximately 60% of the energy from the carotenoid S1 state is accepted by B800. This value is nearly independent of conjugation length of the carotenoid. In addition to its role in energy transfer, the B800 BChla is the only electron acceptor in the event of charge separation between carotenoid and BChla in LH2 complexes, which is demonstrated by prevention of carotenoid radical formation in the LDS-treated LH2 complexes. In the untreated complexes containing neurosporene and spheroidene, the carotenoid radical is formed with a time constant of 300-400 fs. Application of different excitation wavelengths and intensity dependence of the carotenoid radical formation showed that the carotenoid radical can be formed only after excitation of the S2 state of carotenoid, although the S2 state itself is not a precursor of the charge-separated state. Instead, either a hot S1 state or a charge-transfer state lying between S2 and S1 states of the carotenoid are discussed as potential precursors of the charge-separated state.
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Affiliation(s)
- Tomas Polívka
- Institute of Physical Biology, University of South Bohemia, Nove Hrady, Czech Republic.
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Chen M, Cai ZL. Theoretical study on the thermodynamic properties of chlorophyll d-peptides coordinating ligand. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2007; 1767:603-9. [PMID: 17306215 DOI: 10.1016/j.bbabio.2007.01.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2006] [Revised: 12/26/2006] [Accepted: 01/08/2007] [Indexed: 10/23/2022]
Abstract
The chlorophyll d containing cyanobacterium, Acaryochloris marina has provided a model system for the study of chlorophyll replacement in the function of oxygenic photosynthesis. Chlorophyll d replaces most functions of chlorophyll a in Acaryochloris marina. It not only functions as the major light-harvesting pigment, but also acts as an electron transfer cofactor in the primary charge separation reaction in the two photosystems. The Mg-chlorophyll d-peptide coordinating interaction between the amino acid residues and chlorophylls using the latest semi-empirical PM5 method were examined. It is suggested that chlorophyll d possesses similar coordination ligand properties to chlorophyll a, but chlorophyll b possesses different ligand properties. Compared with other studies involving theoretical correlation and our prior experiments, this study suggests that the chlorophyll a-bound proteins will bind chlorophyll d without difficulty when chlorophyll d is available.
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Affiliation(s)
- Min Chen
- School of Biological Sciences, The University of Sydney, NSW 2006, Australia.
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Ilagan RP, Chapp TW, Hiller RG, Sharples FP, Polívka T, Frank HA. Optical spectroscopic studies of light-harvesting by pigment-reconstituted peridinin-chlorophyll-proteins at cryogenic temperatures. PHOTOSYNTHESIS RESEARCH 2006; 90:5-15. [PMID: 17361463 PMCID: PMC1769343 DOI: 10.1007/s11120-006-9090-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Low temperature, steady-state, optical spectroscopic methods were used to study the spectral features of peridinin-chlorophyll-protein (PCP) complexes in which recombinant apoprotein has been refolded in the presence of peridinin and either chlorophyll a (Chl a), chlorophyll b (Chl b), chlorophyll d (Chl d), 3-acetyl-chlorophyll a (3-acetyl-Chl a) or bacteriochlorophyll a (BChl a). Absorption spectra taken at 10 K provide better resolution of the spectroscopic bands than seen at room temperature and reveal specific pigment-protein interactions responsible for the positions of the Qy bands of the chlorophylls. The study reveals that the functional groups attached to Ring I of the two protein-bound chlorophylls modulate the Qy and Soret transition energies. Fluorescence excitation spectra were used to compute energy transfer efficiencies of the various complexes at room temperature and these were correlated with previously reported ultrafast, time-resolved optical spectroscopic dynamics data. The results illustrate the robust nature and value of the PCP complex, which maintains a high efficiency of antenna function even in the presence of non-native chlorophyll species, as an effective tool for elucidating the molecular details of photosynthetic light-harvesting.
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Affiliation(s)
- Robielyn P. Ilagan
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT 06269-3060 USA
| | - Timothy W. Chapp
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT 06269-3060 USA
| | - Roger G. Hiller
- School of Biological Sciences, Macquarie University, North Ryde, NSW 2109 Australia
| | - Frank P. Sharples
- School of Biological Sciences, Macquarie University, North Ryde, NSW 2109 Australia
| | - Tomáš Polívka
- Institute of Physical Biology, University of South Bohemia, Nové Hrady, Czech Republic
| | - Harry A. Frank
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT 06269-3060 USA
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Papagiannakis E, van Stokkum IHM, Vengris M, Cogdell RJ, van Grondelle R, Larsen DS. Excited-State Dynamics of Carotenoids in Light-Harvesting Complexes. 1. Exploring the Relationship between the S1 and S* States. J Phys Chem B 2006; 110:5727-36. [PMID: 16539518 DOI: 10.1021/jp054633h] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dispersed transient absorption spectra collected at variable excitation intensities in combination with time-resolved signals were used to explore the underlying connectivity of the electronic excited-state manifold of the carotenoid rhodopin glucoside in the light-harvesting 2 complex isolated from Rhodopseudomonas acidophila. We find that the S state, which was recently identified as an excited state in carotenoids bound in bacterial light-harvesting complexes, exhibits a different response to the increase of excitation intensity than the S(1) state, which suggests that the models used so far to describe the excited states of carotenoids are incomplete. We propose two new models that can describe both the time-resolved and the intensity-dependent data; the first postulates that S(1) and S* are not populated in parallel after the decay of the initially excited S(2) state but instead result from the excitation of distinct ground-state subpopulations. The second model introduces a resonantly enhanced light-induced transition during excitation, which promotes population to higher-lying excited states that favors the formation of S* over S(1). Multiwavelength target analysis of the time-resolved and excitation-intensity dependence measurements were used to characterize the involved states and their responses. We show that both proposed models adequately fit the measured data, although it is not possible to determine which model is most apt. The physical origins and implications of both models are explored.
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Affiliation(s)
- Emmanouil Papagiannakis
- Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
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Linnanto J, Korppi-Tommola J. Quantum chemical simulation of excited states of chlorophylls, bacteriochlorophylls and their complexes. Phys Chem Chem Phys 2005; 8:663-87. [PMID: 16482307 DOI: 10.1039/b513086g] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present review describes the use of quantum chemical methods in estimation of structures and electronic transition energies of photosynthetic pigments in vacuum, in solution and imbedded in proteins. Monomeric Mg-porphyrins, chlorophylls and bacteriochlorophylls and their solvent 1:1 and 1:2 complexes were studied. Calculations were performed for Mg-porphyrin, Mg-chlorin, Mg-bacteriochlorin, mesochlorophyll a, chlorophylls a, b, c(1), c(2), c(3), d and bacteriochlorophylls a, b, c, d, e, f, g, h, plus several homologues. Geometries were optimised with PM3, PM3/CISD, PM5, ab initio HF (6-31G*/6-311G**) and density functional B3LYP (6-31G*/6-311G**) methods. Spectroscopic transition energies were calculated with ZINDO/S CIS, PM3 CIS, PM3 CISD, ab initio CIS, time-dependent HF and time-dependent B3LYP methods. Estimates for experimental transition energies were obtained from linear correlations of the calculated transition energies of 1:1 solvent complexes against experimentally recorded solution energies (scaling). According to the calculations in five-coordinated solvent complexes the magnesium atom lies out of the porphyrin plane, while in six-coordinated complexes the porphyrin is nearly planar. Charge densities on magnesium and nitrogen atoms were strongly dependent on the computational method deployed. Several dark states of low oscillator strength below the main Soret band were predicted for solvent complexes and chlorophylls and bacteriochlorophylls in protein environment. Such states, though not yet identified experimentally, might serve as intermediate states for excitation energy transfer in photosynthetic complexes. Q(y), Q(x) and Soret transition energies were found to depend on the orientation of the acetyl group and external pressure. A method to estimate site energies and dimeric interaction energies and to simulate absorption and CD spectra of photosynthetic complexes is described. Simulations for the light harvesting complexes Rhodospirillum molischianum, chlorosomes of Chlorobium tepidum and Chloroflexus aurantiacus, and LHC-II of Spinacia oleracea are presented as examples.
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Affiliation(s)
- Juha Linnanto
- Physical Chemistry Laboratory, University of Jyväskylä, P.O. Box 35, FIN-40014, Finland.
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Miller DJ, Catmull J, Puskeiler R, Tweedale H, Sharples FP, Hiller RG. Reconstitution of the peridinin-chlorophyll a protein (PCP): evidence for functional flexibility in chlorophyll binding. PHOTOSYNTHESIS RESEARCH 2005; 86:229-40. [PMID: 16172941 DOI: 10.1007/s11120-005-2067-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2004] [Accepted: 02/08/2005] [Indexed: 05/04/2023]
Abstract
The coding regions for the N-domain, and full length peridinin-chlorophyll a apoprotein (full length PCP), were expressed in Escherichia coli. The apoproteins formed inclusion bodies from which the peptides could be released by hot buffer. Both the above constructs were reconstituted by addition of a total pigment extract from native PCP. After purification by ion exchange chromatography, the absorbance, fluorescence excitation and CD spectra resembled those of the native PCP. Energy transfer from peridinin to Chl a was restored and a specific fluorescence activity calculated which was approximately 86% of that of native PCP. Size exclusion analysis and CD spectra showed that the N-domain PCP dimerized on reconstitution. Chl a could be replaced by Chl b, 3-acetyl Chl a, Chl d and Bchl using the N-domain apo protein. The specific fluorescence activity was the same for constructs with Chl a, 3-acetyl Chl a, and Chl d but significantly reduced for those made with Chl b. Reconstitutions with mixtures of chlorophylls were also made with eg Chl b and Chl d and energy transfer from the higher energy Qy band to the lower was demonstrated.
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Affiliation(s)
- David J Miller
- Comparative Genomics Centre, James Cook University, Molecular Sciences Building 21, Townsville, QLD, 4711, Australia
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Polívka T, Pullerits T, Frank HA, Cogdell RJ, Sundström V. Ultrafast Formation of a Carotenoid Radical in LH2 Antenna Complexes of Purple Bacteria. J Phys Chem B 2004. [DOI: 10.1021/jp0483019] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomáš Polívka
- Department of Chemical Physics, Lund University, Box 124, S-22100 Lund, Sweden, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, S-22100 Lund, Sweden, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Harry A. Frank
- Department of Chemical Physics, Lund University, Box 124, S-22100 Lund, Sweden, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Richard J. Cogdell
- Department of Chemical Physics, Lund University, Box 124, S-22100 Lund, Sweden, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Villy Sundström
- Department of Chemical Physics, Lund University, Box 124, S-22100 Lund, Sweden, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K
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Herek JL, Wendling M, He Z, Polívka T, Garcia-Asua G, Cogdell RJ, Hunter CN, van Grondelle R, Sundström V, Pullerits T. Ultrafast Carotenoid Band Shifts: Experiment and Theory. J Phys Chem B 2004. [DOI: 10.1021/jp040094p] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. L. Herek
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - M. Wendling
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - Z. He
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - T. Polívka
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - G. Garcia-Asua
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - R. J. Cogdell
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - C. N. Hunter
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - R. van Grondelle
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - V. Sundström
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
| | - T. Pullerits
- Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden, Krebs Institute and Robert Hill Institute for Photosynthesis, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, U. K., Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, IBLS, University of Glasgow, Glasgow G12 8QQ, U. K., and FOM-Institute for Atomic and Molecular Physics, Kruislaan
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Rondonuwu FS, Yokoyama K, Fujii R, Koyama Y, Cogdell RJ, Watanabe Y. The role of the 11Bu− state in carotenoid-to-bacteriochlorophyll singlet-energy transfer in the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum and Rhodopseudomonas acidophila. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.03.089] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Polívka T, Zigmantas D, Herek JL, He Z, Pascher T, Pullerits T, Cogdell RJ, Frank HA, Sundström V. The Carotenoid S1 State in LH2 Complexes from Purple Bacteria Rhodobacter sphaeroides and Rhodopseudomonas acidophila: S1 Energies, Dynamics, and Carotenoid Radical Formation. J Phys Chem B 2002. [DOI: 10.1021/jp025752p] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomáš Polívka
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Donatas Zigmantas
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Jennifer L. Herek
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Zhi He
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Torbjörn Pascher
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Tõnu Pullerits
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Richard J. Cogdell
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Harry A. Frank
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
| | - Villy Sundström
- Chemical Physics, Lund University, Box 124, S-221 00 Lund, Sweden, Division of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Glasgow, G12 8QQ Glasgow, U.K., and Department of Chemistry, University of Connecticut, Storrs, Connecticut 0629−3060
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Buche A, Ellis G, Ramirez JM. Probing the binding site of 800-nm bacteriochlorophyll in the membrane-linked LH2 protein of Rhodobacter capsulatus
by local unfolding and chemical modification. ACTA ACUST UNITED AC 2001; 268:2792-800. [PMID: 11358494 DOI: 10.1046/j.1432-1327.2001.02026.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The aim of this study was to investigate the function of betaHis20 in the spectral behavior of the 800-nm bacteriochlorophyll (Bchl) of the Rhodobacter capsulatus LH2 protein. In this context, the 800-nm Bchl of the membrane-linked LH2 was used as an intrinsic probe to follow the reversible, denaturant-elicited unfolding of the neighboring protein region. This band was reversibly shifted to approximately 770 nm by acidic pH, suggesting that the environment of the pigment, responsible for its native red shift, was significantly disturbed by the protonation of a chemical group. The reversible acid-induced blue shift was only observed in the presence of unfolding agents (urea and guanidinium chloride). Thus, dismantling of the protein structure facilitated exposure of the basic group to the medium. The acid-base titrations of the spectral shift indicated an apparent pK approximately 6.1, a value consistent with His imidazole being the protonatable group responsible for the acid-induced band shift. The pK values of free N-terminal amino groups are higher and not expected to be lowered by their local environment in the unfolded state of the protein. A similar blue shift of the 800-nm Bchl band was caused by the modifier diethyl pyrocarbonate, which is known to carboxylate the imidazole group of His and free amino groups. It is also shown that the Fourier transform Raman spectrum of diethyl pyrocarbonate-treated LH2 preparations lacks the weak mode at 1695 cm(-1), suggesting that it should be assigned to the B800 Bchl.
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Affiliation(s)
- A Buche
- Estación Experimental de Aula Dei (CSIC), Zaragoza, Spain.
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43
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Ihalainen JA, Linnanto J, Myllyperkiö P, van Stokkum IHM, Ücker B, Scheer H, Korppi-Tommola JEI. Energy Transfer in LH2 of Rhodospirillum Molischianum, Studied by Subpicosecond Spectroscopy and Configuration Interaction Exciton Calculations. J Phys Chem B 2001. [DOI: 10.1021/jp010921b] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Janne A. Ihalainen
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Juha Linnanto
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Pasi Myllyperkiö
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Ivo H. M. van Stokkum
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Beate Ücker
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Hugo Scheer
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
| | - Jouko E. I. Korppi-Tommola
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland, Division of Physics and Astronomy of the Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands, and Botanisches Institut der Universität München, Menzinger Strasse 67, D-80638 München, Germany
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Tsapis N, Reiss-Husson F, Ober R, Genest M, Hodges RS, Urbach W. Self diffusion and spectral modifications of a membrane protein, the Rubrivivax gelatinosus LH2 complex, incorporated into a monoolein cubic phase. Biophys J 2001; 81:1613-23. [PMID: 11509374 PMCID: PMC1301639 DOI: 10.1016/s0006-3495(01)75815-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The light-harvesting complex LH2 from a purple bacterium, Rubrivivax gelatinosus, has been incorporated into the Q230 cubic phase of monoolein. We measured the self-diffusion of LH2 in detergent solution and in the cubic phase by fluorescence recovery after photobleaching. We investigated also the absorption and fluorescence properties of this oligomeric membrane protein in the cubic phase, in comparison with its beta-octyl glucoside solution. In these experiments, native LH2 and LH2 labeled by a fluorescent marker were used. The results indicate that the inclusion of LH2 into the cubic phase induced modifications in the carotenoid and B800 binding sites. Despite these significant perturbations, the protein seems to keep an oligomeric structure. The relevance of these observations for the possible crystallization of this protein in the cubic phase is discussed.
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Affiliation(s)
- N Tsapis
- Laboratoire de Physique Statistique de l'Ecole Normale Supérieure, UMR 8550 CNRS, 75231 Paris Cedex 05, France
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45
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Gall A, Robert B, Cogdell RJ, Bellissent-Funel MC, Fraser NJ. Probing the binding sites of exchanged chlorophyll a in LH2 by Raman and site-selection fluorescence spectroscopies. FEBS Lett 2001; 491:143-7. [PMID: 11226437 DOI: 10.1016/s0014-5793(01)02161-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work we have selectively released the 800 nm absorbing bacteriochlorophyll a molecules of the LH2 protein from the photosynthetic bacterium Rhodopseudomonas acidophila, strain 10050, and replaced them with chlorophyll a (Chla). A combination of low-temperature electronic absorption, resonance Raman and site-selection fluorescence spectroscopies revealed that the Chla pigments are indeed bound in the B800 binding site; this is the first work that formally proves that such non-native chlorins can be inserted correctly into LH2.
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Affiliation(s)
- A Gall
- Laboratoire Lèon Brillouin (CEA-CNRS), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.
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Macpherson AN, Arellano JB, Fraser NJ, Cogdell RJ, Gillbro T. Efficient energy transfer from the carotenoid S(2) state in a photosynthetic light-harvesting complex. Biophys J 2001; 80:923-30. [PMID: 11159459 PMCID: PMC1301290 DOI: 10.1016/s0006-3495(01)76071-7] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Previously, the spatial arrangement of the carotenoid and bacteriochlorophyll molecules in the peripheral light-harvesting (LH2) complex from Rhodopseudomonas acidophila strain 10050 has been determined at high resolution. Here, we have time resolved the energy transfer steps that occur between the carotenoid's initial excited state and the lowest energy group of bacteriochlorophyll molecules in LH2. These kinetic data, together with the existing structural information, lay the foundation for understanding the detailed mechanisms of energy transfer involved in this fundamental, early reaction in photosynthesis. Remarkably, energy transfer from the rhodopin glucoside S(2) state, which has an intrinsic lifetime of approximately 120 fs, is by far the dominant pathway, with only a minor contribution from the longer-lived S(1) state.
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Affiliation(s)
- A N Macpherson
- Department of Biophysical Chemistry, Umeå University, SE-90187 Umeå, Sweden.
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47
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Metzler DE, Metzler CM, Sauke DJ. Light and Life. Biochemistry 2001. [DOI: 10.1016/b978-012492543-4/50026-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Herek JL, Fraser NJ, Pullerits T, Martinsson P, Polívka T, Scheer H, Cogdell RJ, Sundström V. B800-->B850 energy transfer mechanism in bacterial LH2 complexes investigated by B800 pigment exchange. Biophys J 2000; 78:2590-6. [PMID: 10777755 PMCID: PMC1300848 DOI: 10.1016/s0006-3495(00)76803-2] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Femtosecond transient absorption measurements were performed on native and a series of reconstituted LH2 complexes from Rhodopseudomonas acidophila 10050 at room temperature. The reconstituted complexes contain chemically modified tetrapyrrole pigments in place of the native bacteriochlorophyll a-B800 molecules. The spectral characteristics of the modified pigments vary significantly, such that within the B800 binding sites the B800 Q(y) absorption maximum can be shifted incrementally from 800 to 670 nm. As the spectral overlap between the B800 and B850 Q(y) bands decreases, the rate of energy transfer (as determined by the time-dependent bleaching of the B850 absorption band) also decreases; the measured time constants range from 0.9 ps (bacteriochlorophyll a in the B800 sites, Q(y) absorption maximum at 800 nm) to 8.3 ps (chlorophyll a in the B800 sites, Q(y) absorption maximum at 670 nm). This correlation between energy transfer rate and spectral blue-shift of the B800 absorption band is in qualitative agreement with the trend predicted from Förster spectral overlap calculations, although the experimentally determined rates are approximately 5 times faster than those predicted by simulations. This discrepancy is attributed to an underestimation of the electronic coupling between the B800 and B850 molecules.
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Affiliation(s)
- J L Herek
- Department of Chemical Physics, Lund University, S-22100 Lund, Sweden
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49
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Scholes GD, Fleming GR. On the Mechanism of Light Harvesting in Photosynthetic Purple Bacteria: B800 to B850 Energy Transfer. J Phys Chem B 2000. [DOI: 10.1021/jp993435l] [Citation(s) in RCA: 370] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gregory D. Scholes
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
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