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Böde K, Javornik U, Dlouhý O, Zsíros O, Biswas A, Domonkos I, Šket P, Karlický V, Ughy B, Lambrev PH, Špunda V, Plavec J, Garab G. Role of isotropic lipid phase in the fusion of photosystem II membranes. Photosynth Res 2024:10.1007/s11120-024-01097-3. [PMID: 38662326 DOI: 10.1007/s11120-024-01097-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 03/18/2024] [Indexed: 04/26/2024]
Abstract
It has been thoroughly documented, by using 31P-NMR spectroscopy, that plant thylakoid membranes (TMs), in addition to the bilayer (or lamellar, L) phase, contain at least two isotropic (I) lipid phases and an inverted hexagonal (HII) phase. However, our knowledge concerning the structural and functional roles of the non-bilayer phases is still rudimentary. The objective of the present study is to elucidate the origin of I phases which have been hypothesized to arise, in part, from the fusion of TMs (Garab et al. 2022 Progr Lipid Res 101,163). We take advantage of the selectivity of wheat germ lipase (WGL) in eliminating the I phases of TMs (Dlouhý et al. 2022 Cells 11: 2681), and the tendency of the so-called BBY particles, stacked photosystem II (PSII) enriched membrane pairs of 300-500 nm in diameter, to form large laterally fused sheets (Dunahay et al. 1984 BBA 764: 179). Our 31P-NMR spectroscopy data show that BBY membranes contain L and I phases. Similar to TMs, WGL selectively eliminated the I phases, which at the same time exerted no effect on the molecular organization and functional activity of PSII membranes. As revealed by sucrose-density centrifugation, magnetic linear dichroism spectroscopy and scanning electron microscopy, WGL disassembled the large laterally fused sheets. These data provide direct experimental evidence on the involvement of I phase(s) in the fusion of stacked PSII membrane pairs, and strongly suggest the role of non-bilayer lipids in the self-assembly of the TM system.
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Affiliation(s)
- Kinga Böde
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
- Doctoral School of Biology, University of Szeged, Szeged, Hungary
- Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Uroš Javornik
- Slovenian NMR Center, National Institute of Chemistry, Ljubljana, Slovenia
| | - Ondřej Dlouhý
- Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Ottó Zsíros
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Avratanu Biswas
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
- Doctoral School of Biology, University of Szeged, Szeged, Hungary
| | - Ildikó Domonkos
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Primož Šket
- Slovenian NMR Center, National Institute of Chemistry, Ljubljana, Slovenia
| | - Václav Karlický
- Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
| | - Bettina Ughy
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Petar H Lambrev
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Vladimír Špunda
- Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
| | - Janez Plavec
- Slovenian NMR Center, National Institute of Chemistry, Ljubljana, Slovenia
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia
- EN-FIST Center of Excellence, Ljubljana, Slovenia
| | - Győző Garab
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary.
- Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic.
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Domokos-Szabolcsy É, Fári M, Márton L, Czakó M, Veres S, Elhawat N, Antal G, El-Ramady H, Zsíros O, Garab G, Alshaal T. Selenate tolerance and selenium hyperaccumulation in the monocot giant reed (Arundo donax), a biomass crop plant with phytoremediation potential. Environ Sci Pollut Res Int 2018; 25:31368-31380. [PMID: 30196460 DOI: 10.1007/s11356-018-3127-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 09/03/2018] [Indexed: 06/08/2023]
Abstract
The response of giant reed (Arundo donax L.) to selenium (Se), added as selenate, was studied. The development, stress response, uptake, translocation, and accumulation of Se were documented in three giant reed ecotypes STM (Hungary), BL (USA), and ESP (Spain), representing different climatic zones. Plantlets regenerated from sterile tissue cultures were grown under greenhouse conditions in sand supplemented with 0, 2.5, 5, and 10 mg Se kg-1 added as sodium selenate. Total Se content was measured in different plant parts using hydride generation atomic fluorescence spectroscopy. All plants developed normally in the 0-5.0 mg Se kg-1 concentration range regardless of ecotype, but no growth occurred at 10.0 mg Se kg-1. There were no signs of chlorosis or necrosis, and the photosynthetic machinery was not affected as evidenced by no marked differences in the structure of thylakoid membranes. There was no change in the maximum quantum yield of photosystem II (Fv/Fm ratio) in the three ecotypes under Se stress, except for a significant negative effect in the ESP ecotype in the 5.0 mg Se kg-1 treatment. Glutathione peroxidase (GPx) activity increased as the Se concentration increased in the growth medium. GPx activity was higher in the shoot system than the root system in all Se treatments. All ecotypes showed great capacity of take up, translocate and accumulate selenium in their stem and leaf. Relative Se accumulation is best described as leaf ˃˃ stem ˃ root. The ESP ecotype accumulated 1783 μg g-1 in leaf, followed by BL with 1769 μg g-1, and STM with 1606 μg g-1 in the 5.0 mg Se kg-1 treatment. All ecotypes showed high values of translocation and bioaccumulation factors, particularly the ESP ecotype (10.1 and 689, respectively, at the highest tolerated Se supplementation level). Based on these findings, Arundo donax has been identified as the first monocot hyperaccumulator of selenium, because Se concentration in the leaves of all three ecotypes, and also in the stem of the ESP ecotype, is higher than 0.1% (dry weight basis) under the conditions tested. Tolerance up to 5.0 mg Se kg-1 and the Se hyperaccumulation capacity make giant reed a promising tool for Se phytoremediation.
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Affiliation(s)
- Éva Domokos-Szabolcsy
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary
| | - Miklós Fári
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary
| | - László Márton
- Department of Biological Sciences, University of South Carolina, Columbia, SC, USA
| | - Mihály Czakó
- Department of Biological Sciences, University of South Carolina, Columbia, SC, USA
| | - Szilvia Veres
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary
| | - Nevien Elhawat
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary
- Faculty of Home Economic, Department of Biological and Environmental Sciences, Al-Azhar University, Cairo, Egypt
| | - Gabriella Antal
- Faculty of Economics and Business, Institute of Sectoral Economics and Methodology, University of Debrecen, Debrecen, Hungary
| | - Hassan El-Ramady
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary
- Soil and Water Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, 33516, Egypt
| | - Ottó Zsíros
- Biological Research Center, Hungarian Academy of Sciences, Institute of Plant Biology, POB 521, Szeged, H-6701, Hungary
| | - Győző Garab
- Biological Research Center, Hungarian Academy of Sciences, Institute of Plant Biology, POB 521, Szeged, H-6701, Hungary
- Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Tarek Alshaal
- Department of Agricultural Botany, Plant Physiology and Biotechnology, University of Debrecen, AGTC Böszörményi ut 138, Debrecen, 4032, Hungary.
- Soil and Water Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, 33516, Egypt.
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Erdei AI, Borbély A, Magyar A, Taricska N, Perczel A, Zsíros O, Garab G, Szűcs E, Ötvös F, Zádor F, Balogh M, Al-Khrasani M, Benyhe S. Biochemical and pharmacological characterization of three opioid-nociceptin hybrid peptide ligands reveals substantially differing modes of their actions. Peptides 2018; 99:205-216. [PMID: 29038035 DOI: 10.1016/j.peptides.2017.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 10/10/2017] [Accepted: 10/11/2017] [Indexed: 12/23/2022]
Abstract
In an attempt to design opioid-nociceptin hybrid peptides, three novel bivalent ligands, H-YGGFGGGRYYRIK-NH2, H-YGGFRYYRIK-NH2 and Ac-RYYRIKGGGYGGFL-OH were synthesized and studied by biochemical, pharmacological, biophysical and molecular modelling tools. These chimeric molecules consist of YGGF sequence, a crucial motif in the N-terminus of natural opioid peptides, and Ac-RYYRIK-NH2, which was isolated from a combinatorial peptide library as an antagonist or partial agonist that inhibits the biological activity of the endogenously occurring heptadecapeptide nociceptin. Solution structures for the peptides were studied by analysing their circular dichroism spectra. Receptor binding affinities were measured by equilibrium competition experiments using four highly selective radioligands. G-protein activating properties of the multitarget peptides were estimated in [35S]GTPγS binding tests. The three compounds were also measured in electrically stimulated mouse vas deferens (MVD) bioassay. H-YGGFGGGRYYRIK-NH2 (BA55), carrying N-terminal opioid and C-terminal nociceptin-like sequences interconnected with GGG tripeptide spacer displayed a tendency of having either unordered or β-sheet structures, was moderately potent in MVD and possessed a NOP/KOP receptor preference. A similar peptide without spacer H-YGGFRYYRIK-NH2 (BA62) exhibited the weakest effect in MVD, more α-helical periodicity was present in its structure and it exhibited the most efficacious agonist actions in the G-protein stimulation assays. The third hybrid peptide Ac-RYYRIKGGGYGGFL-OH (BA61) unexpectedly displayed opioid receptor affinities, because the opioid message motif is hidden within the C-terminus. The designed chimeric peptide ligands presented in this study accommodate well into a group of multitarget opioid compounds that include opioid-non-opioid peptide dimer analogues, dual non-peptide dimers and mixed peptide- non-peptide bifunctional ligands.
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Affiliation(s)
- Anna I Erdei
- Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Adina Borbély
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, H-1117, Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Anna Magyar
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, H-1117, Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Nóra Taricska
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University, Pázmány P. sétány 1/A, Budapest, H-1117, Hungary
| | - András Perczel
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University, Pázmány P. sétány 1/A, Budapest, H-1117, Hungary; MTA-ELTE Protein Modelling Research Group, Institute of Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, H-1117, Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Ottó Zsíros
- Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Győző Garab
- Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Edina Szűcs
- Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Ferenc Ötvös
- Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Ferenc Zádor
- Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary
| | - Mihály Balogh
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, H-1445, Budapest, Nagyvárad tér 4., Hungary
| | - Mahmoud Al-Khrasani
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, H-1445, Budapest, Nagyvárad tér 4., Hungary
| | - Sándor Benyhe
- Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62., Hungary.
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Németh IB, Zsíros O, Koreck A, Bella Z, Kiricsi Á, Ignácz F, Kadocsa E, Kemény L. Ultraviolet light and photodynamic therapy induce apoptosis in nasal polyps. Journal of Photochemistry and Photobiology B: Biology 2012; 117:179-84. [DOI: 10.1016/j.jphotobiol.2012.09.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 09/16/2012] [Accepted: 09/25/2012] [Indexed: 12/12/2022]
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Sas KN, Kovács L, Zsíros O, Gombos Z, Garab G, Hemmingsen L, Danielsen E. Fast cadmium inhibition of photosynthesis in cyanobacteria in vivo and in vitro studies using perturbed angular correlation of γ-rays. J Biol Inorg Chem 2006; 11:725-34. [PMID: 16821039 DOI: 10.1007/s00775-006-0113-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2005] [Accepted: 04/26/2006] [Indexed: 11/28/2022]
Abstract
The effect of cadmium on the photosynthetic activity of Synechocystis PCC 6803 was monitored in this study. The oxygen evolving capacity of Synechocystis treated with 40 muM CdCl(2) was depressed to 10% of the maximum in 15 min, indicating that Cd(2+) penetrated rapidly into the cells and blocked the photosynthetic activity. However, neither photosystem II (PSII) nor photosystem I (PSI) activity showed a significant short-term decrease which would explain this fast decrease in the whole-chain electron transport. Thermoluminescence measurements have shown that the charge separation and stabilization in PSII remains essentially unchanged during the first few hours following the Cd(2+) treatment. The electron flow through PSI was monitored by following the redox changes of the P700 reaction centers of PSI. Alterations in the oxidation kinetics of P700 in the Cd(2+)-treated cells indicated that Cd(2+) treatment might affect the available electron acceptor pool of P700, including the CO(2) reduction and accumulation in the cells. Perturbed angular correlation of gamma-rays (PAC) using the radioactive (111m)Cd isotope was used to follow the Cd(2+) uptake at a molecular level. The most plausible interpretation of the PAC data is that Cd(2+) is taken up by one or more Zn proteins replacing Zn(2+) in Synechocystis PCC 6803. Using the radioactive (109)Cd isotope, a protein of approximately 30 kDa that binds Cd(2+) could be observed in sodium dodecyl sulfate polyacrylamide gel electrophoresis. The results indicate that Cd(2+) might inactivate different metal-containing enzymes, including carbonic anhydrase, by replacing the zinc ion, which would explain the rapid and almost full inhibition of the photosynthetic activity in cyanobacteria.
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Affiliation(s)
- Klára Nárcisz Sas
- Department of Natural Sciences, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.
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