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Dong J, Wang P. Discovery of ultra-weakly coupled β-carotene J-aggregates by machine learning. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 310:123950. [PMID: 38277780 DOI: 10.1016/j.saa.2024.123950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/13/2024] [Accepted: 01/21/2024] [Indexed: 01/28/2024]
Abstract
Carotenoid aggregates are omnipresent in natural world and can be synthesized in hydrophilic environments. Despite different types of carotenoid aggregates have been reported hitherto, the way to predict the formation of carotenoid aggregates, i.e. H- or J-aggregates, is still challenging. Here, for the first time, we established machine learning models that can predict the formation behavior of carotenoid aggregates. The models are trained based on a database containing different types of carotenoid aggregates reported in the literatures. With the help of these machine learning models, we found a series of unknown types of β-carotene J-aggregates. These novel aggregates are ultra-weakly coupled and have absorption bands up to 700 nm, different from all the carotenoid aggregates reported previously. Our work demonstrates that the machine learning is a powerful tool to predict the formation behavior of carotenoid aggregates and can further lead into the discovery of new carotenoid aggregates for different applications.
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Affiliation(s)
- Jia Dong
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China.
| | - Peng Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China.
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Sutherland G, Pidgeon JP, Lee HKH, Proctor MS, Hitchcock A, Wang S, Chekulaev D, Tsoi WC, Johnson MP, Hunter CN, Clark J. Twisted Carotenoids Do Not Support Efficient Intramolecular Singlet Fission in the Orange Carotenoid Protein. J Phys Chem Lett 2023; 14:6135-6142. [PMID: 37364284 PMCID: PMC10331831 DOI: 10.1021/acs.jpclett.3c01139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 06/22/2023] [Indexed: 06/28/2023]
Abstract
Singlet exciton fission is the spin-allowed generation of two triplet electronic excited states from a singlet state. Intramolecular singlet fission has been suggested to occur on individual carotenoid molecules within protein complexes provided that the conjugated backbone is twisted out of plane. However, this hypothesis has been forwarded only in protein complexes containing multiple carotenoids and bacteriochlorophylls in close contact. To test the hypothesis on twisted carotenoids in a "minimal" one-carotenoid system, we study the orange carotenoid protein (OCP). OCP exists in two forms: in its orange form (OCPo), the single bound carotenoid is twisted, whereas in its red form (OCPr), the carotenoid is planar. To enable room-temperature spectroscopy on canthaxanthin-binding OCPo and OCPr without laser-induced photoconversion, we trap them in a trehalose glass. Using transient absorption spectroscopy, we show that there is no evidence of long-lived triplet generation through intramolecular singlet fission despite the canthaxanthin twist in OCPo.
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Affiliation(s)
- George
A. Sutherland
- Plants,
Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K.
| | - James P. Pidgeon
- Department
of Physics and Astronomy, University of
Sheffield, Sheffield S3 7RH, U.K.
| | - Harrison Ka Hin Lee
- SPECIFIC,
Faculty of Science and Engineering, Swansea
University, Swansea SA1 8EN, U.K.
| | - Matthew S. Proctor
- Plants,
Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K.
| | - Andrew Hitchcock
- Plants,
Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K.
| | - Shuangqing Wang
- Department
of Physics and Astronomy, University of
Sheffield, Sheffield S3 7RH, U.K.
| | - Dimitri Chekulaev
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K.
| | - Wing Chung Tsoi
- SPECIFIC,
Faculty of Science and Engineering, Swansea
University, Swansea SA1 8EN, U.K.
| | - Matthew P. Johnson
- Plants,
Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K.
| | - C. Neil Hunter
- Plants,
Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, U.K.
| | - Jenny Clark
- Department
of Physics and Astronomy, University of
Sheffield, Sheffield S3 7RH, U.K.
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Solvation effect on photophysical and photochemical properties of mono-biotinylated curcumin. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Quaranta A, Krieger-Liszkay A, Pascal AA, Perreau F, Robert B, Vengris M, Llansola-Portoles MJ. Singlet fission in naturally-organized carotenoid molecules. Phys Chem Chem Phys 2021; 23:4768-4776. [PMID: 33599225 DOI: 10.1039/d0cp04493h] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We have investigated the photophysics of aggregated lutein/violaxanthin in daffodil chromoplasts. We reveal the presence of three carotenoid aggregate species, the main one composed of a mixture of lutein/violaxanthin absorbing at 481 nm, and two secondary populations of aggregated carotenoids absorbing circa 500 and 402 nm. The major population exhibits an efficient singlet fission process, generating μs-lived triplet states on an ultrafast timescale. The structural organization of aggregated lutein/violaxanthin in daffodil chromoplasts produces well-defined electronic levels that permit the energetic pathways to be disentangled unequivocally, allowing us to propose a consistent mechanism for singlet fission in carotenoid aggregates. Transient absorption measurements on this system reveal for the first time an entangled triplet signature for carotenoid aggregates, and its evolution into dissociated triplet states. A clear picture of the carotenoid singlet fission pathway is obtained, which is usually blurred due to the intrinsic disorder of carotenoid aggregates.
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Affiliation(s)
- Annamaria Quaranta
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198, Gif-sur-Yvette, France.
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