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Mascoli V, Novoderezhkin V, Liguori N, Xu P, Croce R. Design principles of solar light harvesting in plants: Functional architecture of the monomeric antenna CP29. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2020; 1861:148156. [DOI: 10.1016/j.bbabio.2020.148156] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/13/2019] [Accepted: 01/22/2020] [Indexed: 11/16/2022]
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Arellano JB, Li H, González-Pérez S, Gutiérrez J, Melø TB, Vacha F, Naqvi KR. Trolox, a water-soluble analogue of α-tocopherol, photoprotects the surface-exposed regions of the photosystem II reaction center in vitro. Is this physiologically relevant? Biochemistry 2011; 50:8291-301. [PMID: 21866915 DOI: 10.1021/bi201195u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Can Trolox, a water-soluble analogue of α-tocopherol and a scavenger of singlet oxygen ((1)O(2)), provide photoprotection, under high irradiance, to the isolated photosystem II (PSII) reaction center (RC)? To answer the question, we studied the endogenous production of (1)O(2) in preparations of the five-chlorophyll PSII RC (RC5) containing only one β-carotene molecule. The temporal profile of (1)O(2) emission at 1270 nm photogenerated by RC5 in D(2)O followed the expected biexponential behavior, with a rise time, unaffected by Trolox, of 13 ± 1 μs and decay times of 54 ± 2 μs (without Trolox) and 38 ± 2 μs (in the presence of 25 μM Trolox). The ratio between the total (k(t)) and chemical (k(r)) bimolecular rate constants for the scavenging of (1)O(2) by Trolox in aqueous buffer was calculated to be ~1.3, with a k(t) of (2.4 ± 0.2) × 10(8) M(-1) s(-1) and a k(r) of (1.8 ± 0.2) × 10(8) M(-1) s(-1), indicating that most of the (1)O(2) photosensitized by methylene blue chemically reacts with Trolox in the assay buffer. The photoinduced oxygen consumption in the oxygen electrode, when RC5 and Trolox were mixed, revealed that Trolox was a better (1)O(2) scavenger than histidine and furfuryl alcohol at low concentrations (i.e., <1 mM). After its incorporation into detergent micelles in unbuffered solutions, Trolox was able to photoprotect the surface-exposed regions of the D1-D2 heterodimer, but not the RC5 pigments, which were oxidized, together with the membrane region of the protein matrix of the PSII RC, by (1)O(2). These results are discussed and compared with those of studies dealing with the physiological role of tocopherol molecules as a (1)O(2) scavenger in thylakoid membranes of photosynthetic organisms.
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Affiliation(s)
- Juan B Arellano
- Instituto de Recursos Naturales y Agrobiologı́a de Salamanca, Apdo. 257, 37071 Salamanca, Spain. juan.arellano@irnasa
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Croce R, Morosinotto T, Ihalainen JA, Chojnicka A, Breton J, Dekker JP, van Grondelle R, Bassi R. Origin of the 701-nm Fluorescence Emission of the Lhca2 Subunit of Higher Plant Photosystem I. J Biol Chem 2004; 279:48543-9. [PMID: 15328342 DOI: 10.1074/jbc.m408908200] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Photosystem I of higher plants is characterized by red-shifted spectral forms deriving from chlorophyll chromophores. Each of the four Lhca1 to -4 subunits exhibits a specific fluorescence emission spectrum, peaking at 688, 701, 725, and 733 nm, respectively. Recent analysis revealed the role of chlorophyll-chlorophyll interactions of the red forms in Lhca3 and Lhca4, whereas the basis for the fluorescence emission at 701 nm in Lhca2 is not yet clear. We report a detailed characterization of the Lhca2 subunit using molecular biology, biochemistry, and spectroscopy and show that the 701-nm emission form originates from a broad absorption band at 690 nm. Spectroscopy on recombinant mutant proteins assesses that this band represents the low energy form of an excitonic interaction involving two chlorophyll a molecules bound to sites A5 and B5, the same protein domains previously identified for Lhca3 and Lhca4. The resulting emission is, however, substantially shifted to higher energies. These results are discussed on the basis of the structural information that recently became available from x-ray crystallography (Ben Shem, A., Frolow, F., and Nelson, N. (2003) Nature 426, 630-635). We suggest that, within the Lhca subfamily, spectroscopic properties of chromophores are modulated by the strength of the excitonic coupling between the chromophores A5 and B5, thus yielding fluorescence emission spanning a large wavelength interval. It is concluded that the interchromophore distance rather than the transition energy of the individual chromophores or the orientation of transition vectors represents the critical factor in determining the excitonic coupling in Lhca pigment-protein complexes.
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Affiliation(s)
- Roberta Croce
- Istituto di Biofisica, CNR, Trento, c/o ITC via Sommarive 18, Povo, Trento 38100, Italy.
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Abstract
Understanding the organization of molecules in naturally occurring ordered arrays (e.g. membranes, protein fibres and DNA strands) is of great importance to understanding biological function. Unfortunately, few biophysical techniques provide detailed structural information on these non-crystalline systems. UV, visible and IR linear dichroism have the potential to provide such information. Recent advances in technology and simulations allow this potential to be fulfilled, and can now provide a detailed understanding of the molecular mechanisms of such fundamental biological processes as amyloid fibre formation and membrane protein folding.
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Affiliation(s)
- Timothy R Dafforn
- Department of Biosciences, University of Birmingham, Birmingham B15 2TT, UK.
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Croce R, Morosinotto T, Castelletti S, Breton J, Bassi R. The Lhca antenna complexes of higher plants photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1556:29-40. [PMID: 12351216 DOI: 10.1016/s0005-2728(02)00304-3] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The Lhca antenna complexes of photosystem I (PSI) have been characterized by comparison of native and recombinant preparations. Eight Lhca polypeptides have been found to be all organized as dimers in the PSI-LHCI complex. The red emission fluorescence is associated not only with Lhca1-4 heterodimer, but also with dimers containing Lhca2 and/or Lhca3 complexes. Reconstitution of Lhca1 and Lhca4 monomers as well as of the Lhca1-4 dimer in vitro was obtained. The biochemical and spectroscopic features of these three complexes are reported. The monomers Lhca1 and Lhca4 bind 10 Chls each, while the Chl a/b ratio is lower in Lhca4 as compared to Lhca1. Three carotenoid binding sites have been found in Lhca1, while only two are present in Lhca4. Both complexes contain lutein and violaxanthin while beta-carotene is selectively bound to the Lhca1-4 dimer in substoichiometric amounts upon dimerization. Spectral analysis revealed the presence of low energy absorption forms in Lhca1 previously thought to be exclusively associated with Lhca4. It is shown that the process of dimerization changes the spectroscopic properties of some chromophores and increases the amplitude of the red absorption tail of the complexes. The origin of these spectroscopic features is discussed.
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Affiliation(s)
- Roberta Croce
- Dipartimento Scientifico e Tecnologico, Università di Verona, Strada Le Grazie, 15-37234, Verona, Italy
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Morosinotto T, Castelletti S, Breton J, Bassi R, Croce R. Mutation analysis of Lhca1 antenna complex. Low energy absorption forms originate from pigment-pigment interactions. J Biol Chem 2002; 277:36253-61. [PMID: 12095992 DOI: 10.1074/jbc.m205062200] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The light harvesting complex Lhca1, one of the four gene products comprising the photosystem I antenna system, has been analyzed by site-directed mutagenesis with the aim of determining the chromophore(s) responsible for its long wavelength chlorophyll spectral form, a specific characteristic of the LHCI antenna complex. A family of mutant proteins, each carrying a mutation at a single chlorophyll-binding residue, was obtained and characterized by biochemical and spectroscopic methods. A map of the chromophores bound to each of the 10 chlorophyll-binding sites was drawn, and the energy levels of the Q(y) transition were determined in most cases. When compared with Lhcb proteins previously analyzed, Lhca1 is characterized by stronger interactions between individual chromophores as detected by both biochemical and spectroscopic methods; most mutations, although targeted to a single residue, lead to the loss of more than one chromophore and of conservative CD signals typical of chlorophyll-chlorophyll interactions. The lower energy absorption form (686 nm at 100K, 688 nm at room temperature), which is responsible for the red-shifted emission components at 690 and 701 nm, typical of Lhca1, is associated with a chlorophyll a/chlorophyll a excitonic interaction originating from a pigment cluster localized in the protein domain situated between helix C and the helix A/helix B cross. This cluster includes chlorophylls bound to sites A5-B5-B6 and a xanthophyll bound to site L2.
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Affiliation(s)
- Tomas Morosinotto
- Dipartimento Scientifico e Tecnologico, Università di Verona. Strada Le Grazie, 15-37234 Verona, Italy
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Breton J, Nabedryk E. Transmembrane orientation of α-helices and the organization of chlorophylls in photosynthetic pigment-protein complexes. FEBS Lett 2001. [DOI: 10.1016/0014-5793(84)81196-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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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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Schoepp B, Chabaud E, Breyton C, Verméglio A, Popot JL. On the spatial organization of hemes and chlorophyll in cytochrome b(6)f. A linear and circular dichroism study. J Biol Chem 2000; 275:5275-83. [PMID: 10681499 DOI: 10.1074/jbc.275.8.5275] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The organization of chromophores in the cytochrome b(6) f from Chlamydomonas reinhardtii has been studied spectroscopically. Linear dichroism (LD) measurements, performed on the complex co-reconstituted into vesicles with photosynthetic reaction centers as an internal standard, allow the determination of the orientations of the chromophore with respect to the membrane plane. The orientations of the b(H)- and b(L)-hemes are comparable to those determined crystallographically on the cytochrome bc(1). The excitonic CD signal, resulting from the interaction between b-hemes, is similar to that reported for the cytochrome bc(1). LD and CD data are consistent with the differences between the b(6) f and bc(1) leaving the orientation of the b-hemes unaffected. By contrast, the LD data yield a different orientation for the heme f as compared either to the heme c(1) in the crystallographic structures or to the heme f as studied by electron paramagnetic resonance. This difference could either result from incorrect assumptions regarding the orientations of the electronic transitions of the f-heme or may point to the possibility of a redox-dependent movement of cytochrome f. The chlorophyll a was observed in a well defined orientation, further corroborating a specific binding site for it in the b(6) f complex.
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Affiliation(s)
- B Schoepp
- Laboratoire de Bioénergétique et Ingénierie des Protéines, CNRS 31, Chemin Joseph Aiguier, F-13402 Marseille Cedex 20, France
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Schoepp B, Breton J, Parot P, Verméglio A. Relative orientation of the hemes of the cytochrome bc(1) complexes from Rhodobacter sphaeroides, Rhodospirillum rubrum, and beef heart mitochondria. A linear dichroism study. J Biol Chem 2000; 275:5284-90. [PMID: 10681500 DOI: 10.1074/jbc.275.8.5284] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The orientation of the chromophores in the cytochrome bc(1) of Rhodospirillum rubrum, Rhodobacter sphaeroides, and beef heart mitochondria is reported. The combination of redox-resolved absorption spectrophotometry and linear dichroism experiments at low temperature allows the determination of the orientation of the three hemes with respect to the membrane plane. The orientations of the b(H)-and b(L)-hemes of the R. sphaeroides and beef heart mitochondrial complexes are similar to those determined by crystallographic studies of the mitochondrial cytochrome bc(1). On the other hand the orientations of the b-hemes of the R. rubrum complex lead to the conclusion that the b(H)-heme is more perpendicular to the membrane plane than the b(L)-heme. This could be explained by a specific organization of the b-hemes due to subunit composition of the complex or, alternatively, to a different spatial position of the heme transitions with respect to the porphyrin macrocycle compared with the other complexes. Moreover, our results demonstrate a different orientation of the heme c(1) of the three studied complexes in comparison to crystallographic studies. This difference may arise from the above hypothesis on the transitions of the heme or from flexibility of this subunit in function of its redox state.
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Affiliation(s)
- B Schoepp
- Laboratoire de Bioénergétique et Ingénierie des Protéines CNRS UPR 9036, Institut de Biologie Structurale et Microbiologie, 31 Chemin Joseph Aiguier, F-13402 Marseille Cedex 20, France
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Croce R, Remelli R, Varotto C, Breton J, Bassi R. The neoxanthin binding site of the major light harvesting complex (LHCII) from higher plants. FEBS Lett 1999; 456:1-6. [PMID: 10452518 DOI: 10.1016/s0014-5793(99)00907-2] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The localisation of the xanthophyll neoxanthin within the structure of the major light harvesting complex (LHCII) of higher plants has been investigated by site-directed mutagenesis and spectroscopic methods. Mutation analysis performed on pigment binding sites in different helix domains leads to selective loss of neoxanthin for mutations on helix C thus localising this pigment between the helix C and helix A/B domains. Recombinant proteins binding two lutein molecules per polypeptide but lacking neoxanthin have been used in order to determine the contribution of neoxanthin to the absorption and linear dichroism spectra. The data were used to derive the orientation of the neoxanthin transition moment, lying in the polyene chain, which was thus determined to form an angle of 57 +/- 1.5 degrees with respect to the normal to the membrane plane where the protein is inserted. On the basis of these results we propose a model for the localisation of the carotenoid site in the LHCII structure which is still unresolved.
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Affiliation(s)
- R Croce
- Università di Verona, Facoltà di Scienze MM.FF.NN., Biotecnologie Vegetali, Italy
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Kumazaki S, Ikegami I, Yoshihara K. Excitation and Electron Transfer from Selectively Excited Primary Donor Chlorophyll (P700) in a Photosystem I Reaction Center. J Phys Chem A 1997. [DOI: 10.1021/jp961948b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shigeichi Kumazaki
- Institute for Molecular Science, Myodaiji, Okazaki, 444 Japan, and Faculty of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa, 199-01, Japan
| | - Isamu Ikegami
- Institute for Molecular Science, Myodaiji, Okazaki, 444 Japan, and Faculty of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa, 199-01, Japan
| | - Keitaro Yoshihara
- Institute for Molecular Science, Myodaiji, Okazaki, 444 Japan, and Faculty of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa, 199-01, Japan
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Meyer M, Scheer H, Breton J. Probing native-like orientation of pigments in modified reaction centers from Rhodobacter sphaeroides R26 by linear dichroism. FEBS Lett 1996; 393:131-4. [PMID: 8804441 DOI: 10.1016/0014-5793(96)00869-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Site-specific pigment modifications are useful to investigate structure-function relationships in photosynthesis. In reaction centers bearing modified (bacterio)pheophytins, changed electron transfer kinetics have been related to the changed redox potentials of the pigments introduced (Huber, H. et al. (1995) Chemical Physics, Special Issue, vol 197 (Hochstrasser, R.M. and Hofacker, G.L. eds.) pp. 297-305; [1]). In order to analyze potentially interfering structural changes induced in these reaction centers by the exchange procedure, in particular mispositioning or misorientation of the pigments, low-temperature linear dichroism spectra have been measured for reaction centers from Rhodobacter sphaeroides containing modified bacteriopheophytins and bacteriochlorophylls at the sites HA,B and BA,B, respectively. They show that all modified pigments are oriented similar to the native ones, and that they do not affect significantly the linear dichroism of the monomeric bacteriocholorophylls and bacteriopheophytins or of the primary donor.
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Affiliation(s)
- M Meyer
- Botanisches Institut der Universität München, Germany
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van der Vos R, van Leeuwen PJ, Braun P, Hoff AJ. Analysis of the optical absorbance spectra of D1-D2-cytochrome b-559 complexes by absorbance-detected magnetic resonance. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/0005-2728(92)90008-p] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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The organisation of photosynthetic pigments in a cryptophyte alga: A linear dichroism study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/0005-2728(92)90135-o] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Hiller RG, Breton J. A linear dichroism study of photosynthetic pigment organisation in two fucoxanthin-containing algae. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/0005-2728(92)90136-p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ultrafast energy transfer in LHC-II trimers from the Chl a/b light-harvesting antenna of Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/0005-2728(92)90101-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Spectroscopic properties of LHC-II, the main light-harvesting chlorophyll a/b protein complex from chloroplast membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/s0005-2728(05)80331-7] [Citation(s) in RCA: 130] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Orientation and thermal deactivation of pigments in thylakoid membranes lacking the light-harvesting complexes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1991. [DOI: 10.1016/1011-1344(91)80004-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Hsu BD. Orientation of pea chloroplast in an ac electric field. J Electroanal Chem (Lausanne) 1991. [DOI: 10.1016/0022-0728(91)85578-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Breton J, Ikegami I. Orientation of Photosystem-I pigments: low temperature linear dichroism spectroscopy of a highly-enriched P700 particle isolated from spinach. PHOTOSYNTHESIS RESEARCH 1989; 21:27-36. [PMID: 24424490 DOI: 10.1007/bf00047172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/1988] [Accepted: 09/12/1988] [Indexed: 06/03/2023]
Abstract
The linear dichroism of Photosystem I particles containing 10 chlorophylls per P700 has been investigated at 10 K. The particles were oriented by uniaxial squeezing of polyacrylamide gels. The oxidation state of P700 was altered either by incubation of the gels with redox mediators or by low temperature illumination. The QY transitions of the primary electron donor P700, of the remaining unoxidized chlorophyll in P700(+) and of a chlorophyll molecule absorbing at 686 nm, which presumably corresponds to the primary electron acceptor A0, are all preferentially oriented perpendicular to the gel squeezing direction. The QY transition of the chlorophyll forms absorbing at 670 and 675 nm appear tilted at 40 ± 5° from this orientation axis. This orientation of the various chlorophylls is compared to that previously reported for more native Photosystem I particles.
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Affiliation(s)
- J Breton
- Service de Biophysique, Département de Biologie, CEN Saclay, 91191, Gif-sur-Yvette Cedex, France
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Wróbel D, Hendrich W. Thermal deactivation and energy transfer in isolated photosystem 2 and light-harvesting complexes in poly(vinyl alcohol) film. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1989. [DOI: 10.1016/1011-1344(89)80036-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Choquet Y, de Vitry C, Delepelaire P, Wollman F, Tapie P. Spectroscopic characterization of the Photosystem II chlorophyll-protein complexes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1988. [DOI: 10.1016/0005-2728(88)90096-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hsu BD, Lee JY. Orientation of pigments and pigment-protein complexes in the diatom Cylindrotheca fusiformis. A linear-dichroism study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1987. [DOI: 10.1016/0005-2728(87)90109-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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van Dorssen R, Breton J, Plijter J, Satoh K, van Gorkom H, Amesz J. Spectroscopic properties of the reaction center and of the 47 kDa chlorophyll protein of Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1987. [DOI: 10.1016/0005-2728(87)90048-x] [Citation(s) in RCA: 129] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Breton J, Katoh S. Orientation of the pigments in Photosystem II: low-temperature linear-dichroism study of a core particle and of its chlorophyll-protein subunits isolated from Synechococcus sp. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1987. [DOI: 10.1016/0005-2728(87)90252-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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van Dorssen R, Plijter J, Dekker J, den Ouden A, Amesz J, van Gorkom H. Spectroscopic properties of chloroplast grana membranes and of the core of Photosystem II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1987. [DOI: 10.1016/0005-2728(87)90014-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tapie P, Choquet Y, Wollman FA, Diner B, Breton J. Orientation of the pigments in Photosystem II: A low-temperature linear dichroism and polarized fluorescence emission study of chlorophyll-protein complexes isolated from Chlamydomonas reinhardtii. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1986. [DOI: 10.1016/0005-2728(86)90020-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gülen D, Knox R, Breton J. Optical effects of sodium dodecyl sulfate treatment of the isolated light harvesting complex of higher plants. PHOTOSYNTHESIS RESEARCH 1986; 9:13-20. [PMID: 24442280 DOI: 10.1007/bf00029727] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/1985] [Indexed: 06/03/2023]
Abstract
The light-harvesting complex (LHC) of higher plants isolated using Triton X-100 has been studied during its transformation into a monomeric form known as CPII. The change was accomplished by gradually increasing the concentration of the detergent, sodium dodecyl sulfate (SDS). Changes in the red spectral region of the absorption, circular dichroism (CD), and linear dichroism spectra occurring during this treatment have been observed at room temperature. According to a current hypothesis the main features of the visible region absorption and CD spectra of CPII can be explained reasonably successfully in terms of an exciton coupling among its chlorophyll (Chl) b molecules. We suggest that the spectral differences between the isolated LHC and the CPII may be understood basically in terms of an exciton coupling between the Chl b core of a given CPII unit and at least one of the Chla's of either the same or the adjacent CPII. We propose that this Chl a-Chl b coupling existing in LHC disappears upon segregation into CPII, probably as a result of a detergent-related overall rotation of the strongly coupled Chl b core which changes the relative orientations of the two types of pigments and thus the nature of their coupling.
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Affiliation(s)
- D Gülen
- Department of Physics and Astronomy, University of Rochester, 14627, Rochester, New York, USA
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Kiss LI, Ganago AO, Garab GI. Quantitative method for studying orientation of transition dipoles in membrane vesicles of spherical symmetry. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1985; 11:213-25. [PMID: 4067172 DOI: 10.1016/0165-022x(85)90003-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pigmented vesicular membranes embedded in polyacrylamide gel exhibit linear dichroism when the gel sample is squeezed [Abdourakhmanov, I.A., Ganago, A.O., Erokhin, Yu.E., Solov'ev, A.A. and Chugunov, V.A. (1979) Biochim. Biophys. Acta 546, 183-186]. The orientation technique of gel-squeezing was modified to enhance polarization effects in membrane vesicles of spherical symmetry. Model calculations were carried out to provide a tool for the quantitative evaluation of the dichroism of squeezed gel samples. The orientation angles of the dipoles can be calculated with reasonable precision by measuring two quantities: (i) the macroscopic deformation parameter of the gel sample, and (ii) a parameter (e.g. the polarization ratio of the fluorescence emission) characterizing the orientation of the transition dipoles in the membranes embedded in the squeezed gel. The validity of the model was confirmed through a series of polarization measurements relating to the fluorescence of chlorophyll a in membranes of osmotically shocked chloroplasts, 'blebs'.
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Fetisova Z, Borisov A, Fok M. Analysis of structure-function correlations in light-harvesting photosynthetic antenna: Structure optimization parameters. J Theor Biol 1985. [DOI: 10.1016/s0022-5193(85)80116-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kuang TY, Argyroudi-Akoyunoglou JH, Nakatani HY, Watson J, Arntzen CJ. The origin of the long-wavelength fluorescence emission band (77 degrees K) from photosystem I. Arch Biochem Biophys 1984; 235:618-27. [PMID: 6393881 DOI: 10.1016/0003-9861(84)90236-4] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Isolated photosystem I (PSI)-110 particles, prepared using a minimal concentration of Triton X-100 [J. E. Mullet, J. J. Burke, and C. J. Arntzen (1980) Plant Physiol. 65, 814-822] and further subjected to short-term solubilization with sodium dodecyl sulfate (SDS), were resolved into four pigment-containing bands on polyacrylamide gel electrophoresis (PAGE). We have identified these in order of increasing electrophoretic mobility as being (a) CPIa, (b) CPI, (c) the light-harvesting complex of photosystem I (LHC-I), and (d) a free pigment-zone. LHC-I had an absorption maximum in the red at 668-669 nm and a shoulder at 650 nm, which was resolved by its first-derivative spectrum to indicate the presence of chlorophyll b. LHC-I exhibited a 77 degrees K fluorescence emission maximum at 729-730 nm. The 77 degrees K fluorescence emission maxima of CPIa and CPI, excised from the gel, were at 729 and 722 nm, respectively. The LHC-I band, excised from the gel and rerun on dissociating SDS-PAGE, was resolved into two polypeptide doublets of 24-22.5 and 21-20.5 kDa. The CPIa band under similar conditions was resolved into polypeptides of 68, 24, 22.5, 21, 20.5, 19, 15, and 14 kDa; on the contrary, CPI contained only the 68-kDa polypeptide. When intact thylakoids were subjected to "nondenaturing" SDS-PAGE, LHC-I comigrated with an oligomeric form (dimer) of the light-harvesting chlorophyll a/b pigment-protein that preferentially serves photosystem II (LHCP-II). When this combined LHC-I/LHCP-II pigment-protein band was prepared by SDS-PAGE from isolated stroma lamellae, it exhibited a long-wavelength fluorescence band near 730 nm at 77 degrees K. When a similar preparation was obtained from sucrose density gradients containing SDS [J. Argyroudi-Akoyunoglou and H. Thomou (1981) FEBS Lett. 135, 171-181], it was found to be enriched in a 21-kDa polypeptide. The data suggest that the 21-kDa polypeptide of LHC-I is the chlorophyll-containing polypeptide responsible for the long-wavelength fluorescence of LHC-I; other polypeptides in the complex (20.5, 22.5, and 24 kDa) presumably bind chlorophyll and also serve an antennae function.
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Nabedryk E, Biaudet P, Darr S, Arntzen CJ, Breton J. Conformation and orientation of chlorophyll-proteins in photosystem I by circular dichroism and polarized infrared spectroscopies. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1984. [DOI: 10.1016/0005-2728(84)90066-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tapie P, Choquet Y, Breton J, Delepelaire P, Wollman FA. Orientation of photosystem-I pigments. Investigation by low-temperature linear dichroism and polarized fluorescence emission. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1984. [DOI: 10.1016/0005-2728(84)90079-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Szitó T, Kiss JG, Garab GYI, Mustárdy LA, Faludi-Dániel Á. GENETIC VARIATIONS AND LINOLENIC ACID INDUCED CHANGES IN THE ORIENTATION PATTERN OF CHLOROPHYLL a IN THYLAKOID MEMBRANES. Photochem Photobiol 1984. [DOI: 10.1111/j.1751-1097.1984.tb04561.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ganago A, Garab G, Faludi-Dániel Á. Analysis of linearly polarized fluorescence of chloroplasts oriented in polyacrylamide gel. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1983. [DOI: 10.1016/0005-2728(83)90128-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tapie P, Haworth P, Hervo G, Breton J. Orientation of the pigments in the thylakoid membrane and in the isolated chlorophyll-protein complexes of higher plants. III. A quantitative comparison of the low-temperature linear dichroism spectra of thylakoids and isolated pigment-protein complexes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1982. [DOI: 10.1016/0005-2728(82)90047-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Haworth P, Tapie P, Arntzen C, Breton J. Orientation of plgments in the thylakoid membrane and in the isolated chlorophyll-protein complexes of higher plants. IV. The 100 K linear dichroism spectra of thylakoids from wild-type and chlorophyll b-less barley thylakoids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1982. [DOI: 10.1016/0005-2728(82)90068-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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