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Jassas M, Chen J, Khmelnitskiy A, Casazza AP, Santabarbara S, Jankowiak R. Structure-Based Exciton Hamiltonian and Dynamics for the Reconstituted Wild-type CP29 Protein Antenna Complex of the Photosystem II. J Phys Chem B 2018; 122:4611-4624. [DOI: 10.1021/acs.jpcb.8b00032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Santabarbara S, Agostini A, Casazza AP, Zucchelli G, Carbonera D. Carotenoid triplet states in photosystem II: coupling with low-energy states of the core complex. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1847:262-275. [PMID: 25481107 DOI: 10.1016/j.bbabio.2014.11.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 11/19/2014] [Accepted: 11/21/2014] [Indexed: 11/28/2022]
Abstract
The photo-excited triplet states of carotenoids, sensitised by triplet-triplet energy transfer from the chlorophyll triplet states, have been investigated in the isolated Photosystem II (PSII) core complex and PSII-LHCII (Light Harvesting Complex II) supercomplex by Optically Detected Magnetic Resonance techniques, using both fluorescence (FDMR) and absorption (ADMR) detection. The absence of Photosystem I allows us to reach the full assignment of the carotenoid triplet states populated in PSII under steady state illumination at low temperature. Five carotenoid triplet ((3)Car) populations were identified in PSII-LHCII, and four in the PSII core complex. Thus, four (3)Car populations are attributed to β-carotene molecules bound to the core complex. All of them show associated fluorescence emission maxima which are relatively red-shifted with respect to the bulk emission of both the PSII-LHCII and the isolated core complexes. In particular the two populations characterised by Zero Field Splitting parameters |D|=0.0370-0.0373 cm(-1)/|E|=0.00373-0.00375 cm(-1) and |D|=0.0381-0.0385 cm(-1)/|E|=0.00393-0.00389 cm(-1), are coupled by singlet energy transfer with chlorophylls which have a red-shifted emission peaking at 705 nm. This observation supports previous suggestions that pointed towards the presence of long-wavelength chlorophyll spectral forms in the PSII core complex. The fifth (3)Car component is observed only in the PSII-LHCII supercomplex and is then assigned to the peripheral light harvesting system.
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Affiliation(s)
- Stefano Santabarbara
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Via Celoria 26, 20133 Milan, Italy.
| | - Alessandro Agostini
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Anna Paola Casazza
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, Via Bassini 15a, 20133 Milano, Italy
| | - Giuseppe Zucchelli
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Via Celoria 26, 20133 Milan, Italy
| | - Donatella Carbonera
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, 35131 Padova, Italy.
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Rizzo F, Zucchelli G, Jennings R, Santabarbara S. Wavelength dependence of the fluorescence emission under conditions of open and closed Photosystem II reaction centres in the green alga Chlorella sorokiniana. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:726-33. [PMID: 24561096 DOI: 10.1016/j.bbabio.2014.02.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/10/2014] [Accepted: 02/12/2014] [Indexed: 11/29/2022]
Abstract
The fluorescence emission characteristics of the photosynthetic apparatus under conditions of open (F0) and closed (FM) Photosystem II reaction centres have been investigated under steady state conditions and by monitoring the decay lifetimes of the excited state, in vivo, in the green alga Chlorella sorokiniana. The results indicate a marked wavelength dependence of the ratio of the variable fluorescence, FV=FM-F0, over FM, a parameter that is often employed to estimate the maximal quantum efficiency of Photosystem II. The maximal value of the FV/FM ratio is observed between 660 and 680nm and the minimal in the 690-730nm region. It is possible to attribute the spectral variation of FV/FM principally to the contribution of Photosystem I fluorescence emission at room temperature. Moreover, the analysis of the excited state lifetime at F0 and FM indicates only a small wavelength dependence of Photosystem II trapping efficiency in vivo.
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Affiliation(s)
- Federico Rizzo
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via Celoria 26, 20133 Milano, Italy; Dipartimento di Bioscienze, Università di Milano, via Celoria 26, 20133 Milano, Italy
| | - Giuseppe Zucchelli
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via Celoria 26, 20133 Milano, Italy; Dipartimento di Bioscienze, Università di Milano, via Celoria 26, 20133 Milano, Italy
| | - Robert Jennings
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via Celoria 26, 20133 Milano, Italy; Dipartimento di Bioscienze, Università di Milano, via Celoria 26, 20133 Milano, Italy
| | - Stefano Santabarbara
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via Celoria 26, 20133 Milano, Italy; Dipartimento di Bioscienze, Università di Milano, via Celoria 26, 20133 Milano, Italy.
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Photochemical trapping heterogeneity as a function of wavelength, in plant photosystem I (PSI–LHCI). BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1827:779-85. [DOI: 10.1016/j.bbabio.2013.03.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 03/12/2013] [Accepted: 03/20/2013] [Indexed: 11/18/2022]
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Vannini C, Domingo G, Marsoni M, De Mattia F, Labra M, Castiglioni S, Bracale M. Effects of a complex mixture of therapeutic drugs on unicellular algae Pseudokirchneriella subcapitata. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 101:459-465. [PMID: 21112099 DOI: 10.1016/j.aquatox.2010.10.011] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 09/20/2010] [Accepted: 10/31/2010] [Indexed: 05/30/2023]
Abstract
Pharmaceutically-active compounds are regularly and widely released into the aquatic environment in an unaltered form or as metabolites. So far, little is known about their potential detrimental effects on algae populations which can ultimately impact nutrient cycling and oxygen balance. For our analysis, the common microalga Pseudokirchneriella subcapitata (P. subcapitata) was exposed to a mixture of 13 drugs found in Italian wastewaters and rivers. Traces of pharmaceuticals investigated were detected in treated algal cells, except for cyclophosphamide and ranitidine, indicating that these algae are able to absorb pharmaceutical pollutants from the environment. The effects of the treatment were investigated by Amplified Fragment Length Polymorphism (AFLP) assessment of DNA damage and 2-DE proteomic analysis. While no genotoxic effect was detected, proteomic analysis showed that algae are sensitive to the presence of drugs and that, in particular, the chloroplast is affected.
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Affiliation(s)
- Candida Vannini
- Department of Environment-Health-Safety, University of Insubria, Via G.B. Vico 46, I-21100 Varese, Italy
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Belgio E, Casazza AP, Zucchelli G, Garlaschi FM, Jennings RC. Band Shape Heterogeneity of the Low-Energy Chlorophylls of CP29: Absence of Mixed Binding Sites and Excitonic Interactions. Biochemistry 2010; 49:882-92. [DOI: 10.1021/bi901478f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Erica Belgio
- Istituto di Biofisica del CNR, sede di Milano, e Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy
| | - Anna Paola Casazza
- Istituto di Biofisica del CNR, sede di Milano, e Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy
| | - Giuseppe Zucchelli
- Istituto di Biofisica del CNR, sede di Milano, e Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy
| | - Flavio M. Garlaschi
- Istituto di Biofisica del CNR, sede di Milano, e Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy
| | - Robert C. Jennings
- Istituto di Biofisica del CNR, sede di Milano, e Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy
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Comparison of the thermodynamic landscapes of unfolding and formation of the energy dissipative state in the isolated light harvesting complex II. Biophys J 2009; 97:1188-97. [PMID: 19686667 DOI: 10.1016/j.bpj.2009.06.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2009] [Revised: 06/02/2009] [Accepted: 06/02/2009] [Indexed: 11/23/2022] Open
Abstract
In biochemistry and cell biology, understanding the molecular mechanisms by which physiological processes are regulated is regarded as an ultimate goal. In higher plants, one of the most widely investigated regulatory processes occurs in the light harvesting complexes (LHCII) of the chloroplast thylakoid membranes. Under limiting photon flux densities, LHCII harvests sunlight with high efficiency. When the intensity of incident radiation reaches levels close to the saturation of the photosynthesis, the efficiency of light harvesting is decreased by a process referred to as nonphotochemical quenching (NPQ), which enhances the singlet-excited state deactivation via nonradiative dissipative processes. Conformational rearrangements in LHCII are known to be crucial in promoting and controlling NPQ in vitro and in vivo. In this article, we address the thermodynamic nature of the conformational rearrangements promoting and controlling NPQ in isolated LHCII. A combined, linear reaction scheme in which the folded, quenched state represents a stable intermediate on the unfolding pathway was employed to describe the temperature dependence of the spectroscopic signatures associated with the chlorophyll fluorescence quenching and the loss of secondary structure motifs in LHCII. The thermodynamic model requires considering the temperature dependence of Gibbs free energy difference between the quenched and the unquenched states, as well as the unfolded and quenched states, of LHCII. Even though the same reaction scheme is adequate to describe the quenching and the unfolding processes in LHCII monomers and trimers, their thermodynamic characteristics were found to be markedly different. The results of the thermodynamic analysis shed light on the physiological importance of the trimeric state of LHCII in stabilizing the efficient light harvesting mode as well as preventing the quenched conformation of the protein from unfolding. Moreover, the transition to the quenched conformation in trimers reveals a larger degree of cooperativity than in monomers, explained by a small characteristic entropy (DeltaH(q) = 85 +/- 3 kJ mol(-1) compared to 125 +/- 5 kJ mol(-1) in monomers), which enables the fine-tuning of nonphotochemical quenching in vivo.
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Tumino G, Casazza AP, Engelmann E, Garlaschi FM, Zucchelli G, Jennings RC. Fluorescence Lifetime Spectrum of the Plant Photosystem II Core Complex: Photochemistry Does Not Induce Specific Reaction Center Quenching. Biochemistry 2008; 47:10449-57. [DOI: 10.1021/bi800831j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Giorgio Tumino
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
| | - Anna Paola Casazza
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
| | - Enrico Engelmann
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
| | - Flavio M. Garlaschi
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
| | - Giuseppe Zucchelli
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
| | - Robert C. Jennings
- Dipartimento di Biologia, Università degli Studi di Milano and CNR Istituto di Biofisica, via Celoria 26, 20133 Milano, Italy
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Rivadossi A, Zucchelll G, Gariaschi FM, Jennigns RC. Light Absorption by the Chlorophyll a-b Complexes of Photosystem II in a Leaf with Special Reference to LHCII¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00120.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Engelmann ECM, Zucchelli G, Garlaschi FM, Casazza AP, Jennings RC. The effect of outer antenna complexes on the photochemical trapping rate in barley thylakoid Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2005; 1706:276-86. [PMID: 15694356 DOI: 10.1016/j.bbabio.2004.11.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2004] [Revised: 11/04/2004] [Accepted: 11/23/2004] [Indexed: 11/22/2022]
Abstract
We have investigated the previous suggestions in the literature that the outer antenna of Photosystem II of barley does not influence the effective photosystem primary photochemical trapping rate. It is shown by steady state fluorescence measurements at the F(0) fluorescence level of wild type and the chlorina f2 mutant, using the chlorophyll b fluorescence as a marker, that the outer antenna is thermally equilibrated with the core pigments, at room temperature, under conditions of photochemical trapping. This is in contrast with the conclusions of the earlier studies in which it was suggested that energy was transferred rapidly and irreversibly from the outer antenna to the Photosystem II core. Furthermore, the effective trapping time, determined by single photon counting, time-resolved measurements, was shown to increase from 0.17+/-0.017 ns in the chlorina Photosystem II core to a value within the range 0.42+/-0.036-0.47+/-0.044 ns for the wild-type Photosystem II with the outer antenna system. This 2.5-2.8-fold increase in the effective trapping time is, however, significantly less than that expected for a thermalized system. The data can be explained in terms of the outer antenna increasing the primary charge separation rate by about 50%.
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Affiliation(s)
- Enrico C M Engelmann
- Istituto di Biofisica del C.N.R, Sez. di Milano, Dipartimento di Biologia, Università degli Studi di Milano, Via G. Celoria 26, 20133 Milano, Italy
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Santabarbara S, Carbonera D. Carotenoid Triplet States Associated with the Long-Wavelength-Emitting Chlorophyll Forms of Photosystem I in Isolated Thylakoid Membranes. J Phys Chem B 2004; 109:986-91. [PMID: 16866470 DOI: 10.1021/jp047077k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The carotenoid triplet populations associated with the long-wavelength-emitting chlorophyll forms of photosystem I (PS I)(dagger) have been investigated in isolated spinach thylakoids by means of fluorescence-detected magnetic resonance in zero field. The spectra collected in the 730-800 nm emission range can be globally fitted assuming the presence of four different carotenoid triplet states coupled to long-wavelength-emitting forms of PS I, having zero-field-splitting parameters /D/ = 0.0359 cm(-1) and /E/ = 0.00371 cm(-1), /D/ = 0.0382 cm(-1) and /E/ = 0.00388 cm(-1), /D/ = 0.0395 cm(-1) and /E/ = 0.00397 cm(-1), and /D/ = 0.0405 cm(-1) and /E/ = 0.00411 cm(-1). On the basis of the triplet-associated fluorescence emission profile, it is suggested that those triplets are associated with light-harvesting complex I, the peripheral antenna complex of PS I.
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Affiliation(s)
- Stefano Santabarbara
- School of Biological Sciences, Queen Mary University of London, Mile End Road, E1 4NS London, United Kingdom.
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Jennings RC, Zucchelli G, Engelmann E, Garlaschi FM. The long-wavelength chlorophyll states of plant LHCI at room temperature: a comparison with PSI-LHCI. Biophys J 2004; 87:488-97. [PMID: 15240482 PMCID: PMC1304370 DOI: 10.1529/biophysj.103.038117] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2003] [Accepted: 03/08/2004] [Indexed: 11/18/2022] Open
Abstract
The red antenna states of the external antenna complexes of higher plant photosystem I, known as LHCI, have been analyzed by measurement of their preequilibrium fluorescence upon direct excitation at 280 K. In addition to the previously detected F735 state, a hitherto undetected low-energy state with emission maximum around 713 nm was observed. The 280 K bandwidths (FWHM) are 55 nm for the F735 state and approximately 27 nm for the F713-nm state, much greater than for non-red-shifted antenna chlorophylls. The origin absorption band for the F735-nm state was directly detected by determination of its excitation (action) spectrum and lies at 709-710 nm. The absorption spectrum for F735, calculated using the Stepanov expression, closely overlaps the excitation spectrum, indicating that the very large Stokes shift (25 nm) is due to vibrational relaxation within the excited-state manifold and solvent effects can be excluded. Fluorescence anisotropy measurements, with direct excitation of F735, indicate that the transition dipoles of the two red states are parallel. Similar experiments performed in the long-wavelength absorbing tail of PSI-LHCI indicate the presence of emission state(s) that are red-shifted with respect to F735 of isolated LHCI. It is suggested that these are brought about by interactions between the complexes in PSI-LHCI, which occur in some yet undefined way, and which are broken upon solubilization of the component parts.
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Affiliation(s)
- Robert C Jennings
- Istituto di Biofisica del Consiglio Nazionale delle Ricerche, Sezione di Milano, Dipartimento di Biologia, Università degli Studi di Milano, Milan, Italy.
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Rivadossi A, Zucchelli G, Garlaschi FM, Jennings RC. Light Absorption by the Chlorophyll a–b Complexes of Photosystem II in a Leaf with Special Reference to LHCII¶. Photochem Photobiol 2004; 80:492-8. [PMID: 15623336 DOI: 10.1562/0031-8655(2004)080<0492:labtca>2.0.co;2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To investigate the light-harvesting properties of the Photosystem II chlorophyll (chl) a-b complexes (major light-harvesting complex of Photosystem II [LHCII], CP24, CP26, CP29) in a mature leaf under natural "daylight" illumination, the absorption spectra of the isolated complexes were converted into the photon absorption spectrum (1-T) within a leaf, using the approach of Rivadossi et al. ([1999] Photosynth. Res. 60, 209-215). In the Qy region, significant enhancement of light harvesting by the chl b electronic transitions, with respect to the absorption spectra (optical density [OD]), as well as a large and generalized increase (between two- and four-fold) associated with the vibrational bands of both chl a and b, was observed, which acquires an important light-harvesting role (approximately 30-40% of total). In the Soret region, a small increase in light harvesting by chl b was indicated. To gain more detailed information on these aspects the light harvesting of LHCII in a leaf was investigated. This required describing the pigment absorption (chl a and b, carotenoids) in the LHCII OD spectrum in terms of spectral subbands, which were subsequently used to estimate the relative light harvesting of each pigment type in LHCII of a leaf. When the entire visible spectral interval between 400 and 730 nm is considered, the chl a light harvesting is essentially unchanged with respect to the absorption spectrum (OD) of isolated LHCII, whereas the chl b contribution is 20% higher and the carotenoids are 33% lower. The relative enhancement of the chl b absorption is principally associated with the Qy electronic transition region, the light-harvesting contribution of which becomes prominent in the leaf.
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Affiliation(s)
- Andrea Rivadossi
- Istituto di Biofisica del Consiglio Nazionale delle Ricerche-Sezione di Milano, Dipartimento di Biologia, Università degli Studi di Milano, Milano, Italy
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Jennings RC, Zucchelli G, Croce R, Garlaschi FM. The photochemical trapping rate from red spectral states in PSI-LHCI is determined by thermal activation of energy transfer to bulk chlorophylls. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1557:91-8. [PMID: 12615352 DOI: 10.1016/s0005-2728(02)00399-7] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The average fluorescence decay lifetimes, due to reaction centre photochemical trapping, were calculated for wavelengths in the 690- to 770-nm interval from the published fluorescence decay-associated emission spectra for Photosystem I (PSI)-light-harvesting complex of Photosystem I (LHCI) [Biochemistry 39 (2000) 6341] at 280 and 170 K. For 280 K, the overall trapping time at 690 nm is 81 ps and increases with wavelength to reach 103 ps at 770 nm. For 170 K, the 690-nm value is 115 ps, increasing to 458 ps at 770 nm. This underlines the presence of kinetically limiting processes in the PSI antenna (diffusion limited). The explanation of these nonconstant values for the overall trapping time band is sought in terms of thermally activated transfer from the red absorbing states to the "bulk" acceptor chlorophyll (chl) states in the framework of the Arrhenius-Eyring theory. It is shown that the wavelength-dependent "activation energies" come out in the range between 1.35 and 2.7 kcal mol(-1), increasing with the emission wavelength within the interval 710-770 nm. These values are in good agreement with the Arrhenius activation energy determined for the steady-state fluorescence yield over the range 130-280 K for PSI-LHCI. We conclude that the variable trapping time in PSI-LHCI can be accounted for entirely by thermally activated transfer from the low-energy chl states to the bulk acceptor states and therefore that the position of the various red states in the PSI antenna seems not to be of significant importance. The analysis shows that the bulk antenna acceptor states are on the low-energy side of the bulk antenna absorption band.
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Affiliation(s)
- Robert C Jennings
- Dipartimento di Biologia, Centro C.N.R. Biologia Cellulare e Molecolare delle Piante, Università di Milano, via G. Celoria, 26, 20133 Milan, Italy.
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15
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Trissl HW. Modeling the Excitation Energy Capture in Thylakoid Membranes. PHOTOSYNTHESIS IN ALGAE 2003. [DOI: 10.1007/978-94-007-1038-2_12] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Agarwal R, Rizvi AH, Prall BS, Olsen JD, Hunter CN, Fleming GR. Nature of Disorder and Inter-Complex Energy Transfer in LH2 at Room Temperature: A Three Pulse Photon Echo Peak Shift Study. J Phys Chem A 2002. [DOI: 10.1021/jp014054m] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ritesh Agarwal
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - Abbas H. Rizvi
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - Bradley S. Prall
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - John D. Olsen
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - C. Neil Hunter
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2UH, United Kingdom
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Zucchelli G, Jennings RC, Garlaschi FM, Cinque G, Bassi R, Cremonesi O. The calculated in vitro and in vivo chlorophyll a absorption bandshape. Biophys J 2002; 82:378-90. [PMID: 11751324 PMCID: PMC1302477 DOI: 10.1016/s0006-3495(02)75402-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The room temperature absorption bandshape for the Q transition region of chlorophyll a is calculated using the vibrational frequency modes and Franck-Condon (FC) factors obtained by line-narrowing spectroscopies of chlorophyll a in a glassy (Rebane and Avarmaa, Chem. Phys. 1982; 68:191-200) and in a native environment (Gillie et al., J. Phys. Chem. 1989; 93:1620-1627) at low temperatures. The calculated bandshapes are compared with the absorption spectra of chlorophyll a measured in two different solvents and with that obtained in vivo by a mutational analysis of a chlorophyll-protein complex. It is demonstrated that the measured distributions of FC factors can account for the absorption bandshape of chlorophyll a in a hexacoordinated state, whereas, when pentacoordinated, reduced FC coupling for vibrational frequencies in the range 540-850 cm(-1) occurs. The FC factor distribution for pentacoordinated chlorophyll also describes the native chlorophyll a spectrum but, in this case, either a low-frequency mode (nu < 200 cm(-1)) must be added or else the 262-cm(-1) mode must increase in coupling by about one order of magnitude to describe the skewness of the main absorption bandshape.
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Affiliation(s)
- Giuseppe Zucchelli
- Centro Consiglio Nazionale delle Ricerche, Biologia Cellulare e Molecolare Piante, Dipartimento di Biologia, Università degli Studi di Milano, 20133 Milano, Italy.
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Cinque G, Croce R, Holzwarth A, Bassi R. Energy transfer among CP29 chlorophylls: calculated Förster rates and experimental transient absorption at room temperature. Biophys J 2000; 79:1706-17. [PMID: 11023879 PMCID: PMC1301065 DOI: 10.1016/s0006-3495(00)76423-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The energy transfer rates between chlorophylls in the light harvesting complex CP29 of higher plants at room temperature were calculated ab initio according to the Förster mechanism (Förster T. 1948, Ann. Physik. 2:55-67). Recently, the transition moment orientation of CP29 chlorophylls was determined by differential linear dichroism and absorption spectroscopy of wild-type versus mutant proteins in which single chromophores were missing (Simonetto R., Crimi M., Sandonà D., Croce R., Cinque G., Breton J., and Bassi R. 1999. Biochemistry. 38:12974-12983). In this way the Q(y) transition energy and chlorophyll a/b affinity of each binding site was obtained and their characteristics supported by reconstruction of steady-state linear dichroism and absorption spectra at room temperature. In this study, the spectral form of individual chlorophyll a and b ligands within the protein environment was experimentally determined, and their extinction coefficients were also used to evaluate the absolute overlap integral between donors and acceptors employing the Stepanov relation for both the emission spectrum and the Stokes shift. This information was used to calculate the time-dependent excitation redistribution among CP29 chlorophylls on solving numerically the Pauli master equation of the complex: transient absorption measurements in the (sub)picosecond time scale were simulated and compared to pump-and-probe experimental data in the Q(y) region on the native CP29 at room temperature upon selective excitation of chlorophylls b at 640 or 650 nm. The kinetic model indicates a bidirectional excitation transfer over all CP29 chlorophylls a species, which is particularly rapid between the pure sites A1-A2 and A4-A5. Chlorophylls b in mixed sites act mostly as energy donors for chlorophylls a, whereas site B5 shows high and bidirectional coupling independent of the pigment hosted.
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Affiliation(s)
- G Cinque
- Dipartimento Scientifico e Tecnologico, Università degli Studi di Verona, Facoltà di Scienze, Strada LeGrazie 15, I-37134 Verona, Italy
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Agarwal R, Krueger BP, Scholes GD, Yang M, Yom J, Mets L, Fleming GR. Ultrafast Energy Transfer in LHC-II Revealed by Three-Pulse Photon Echo Peak Shift Measurements. J Phys Chem B 2000. [DOI: 10.1021/jp9915578] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ritesh Agarwal
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Brent P. Krueger
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Gregory D. Scholes
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Mino Yang
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Jenny Yom
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Laurens Mets
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, and Department of Molecular Genetics and Cell Biology, The University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637
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Siemeling U, Vorfeld U, Neumann B, Stammler HG, Zanello P, de Biani FF. Terpyridines Functionalised with Ferrocenyl Groups of Different Redox Potential. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199901)1999:1<1::aid-ejic1>3.0.co;2-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Trinkunas G, Connelly JP, Müller MG, Valkunas L, Holzwarth AR. Model for the Excitation Dynamics in the Light-Harvesting Complex II from Higher Plants. J Phys Chem B 1997. [DOI: 10.1021/jp963968j] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gediminas Trinkunas
- Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34−36, Mülheim a.d. Ruhr, D-45470, Germany, and Institute of Physics, Vilnius 2600, Lithuania
| | - James P. Connelly
- Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34−36, Mülheim a.d. Ruhr, D-45470, Germany, and Institute of Physics, Vilnius 2600, Lithuania
| | - Marc G. Müller
- Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34−36, Mülheim a.d. Ruhr, D-45470, Germany, and Institute of Physics, Vilnius 2600, Lithuania
| | - Leonas Valkunas
- Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34−36, Mülheim a.d. Ruhr, D-45470, Germany, and Institute of Physics, Vilnius 2600, Lithuania
| | - Alfred R. Holzwarth
- Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34−36, Mülheim a.d. Ruhr, D-45470, Germany, and Institute of Physics, Vilnius 2600, Lithuania
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Connelly JP, Müller MG, Bassi R, Croce R, Holzwarth AR. Femtosecond transient absorption study of carotenoid to chlorophyll energy transfer in the light-harvesting complex II of photosystem II. Biochemistry 1997; 36:281-7. [PMID: 9003179 DOI: 10.1021/bi962467l] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Singlet energy transfer between the carotenoids (Cars) and chlorophylls (Chls) in the light-harvesting complex II (LHC II) from higher plants has been studied using ultrafast transient absorption spectroscopy by exciting the Cars directly in the 475-515 nm wavelength range. LHC II trimers from Arabidopsis thaliana with well-defined Car compositions have been used. From HPLC, the wild type (WT) monomer contains two luteins (Ls), one neoxanthin (N), and a trace of violaxanthin (V) per 12 Chls. The ABA-3 mutant contains 1.4 Ls and 0.6 zeaxanthin (Z) per monomer. Though exploitation of the difference in Car constitution and exciting the WT at 475 and 490 nm, and the ABA-3 mutant at 490 and 515 nm, the different Car contributions to energy transfer have been probed. Evidence for energy transfer mainly from the Car to Chl b is observed in the WT. In the mutant, additional transfer from Car to Chl a correlates with the presence of Z. The results imply predominant energy transfer from the central Ls to Chl b which requires a modification of the currently accepted arrangement of Chl pigments in LHC II.
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Affiliation(s)
- J P Connelly
- Max-Planck-Institut für Strahlenchemie, Mülheim an der Ruhr, Germany
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Scholes GD. Energy Transfer and Spectroscopic Characterization of Multichromophoric Assemblies. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp961784z] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregory D. Scholes
- Department of Chemistry, Imperial College of Science, Technology and Medicine, London SW7 2AY, United Kingdom
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