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1. Conformational Changes and H-Bond Rearrangements during Quinone Release in Photosystem II

Author:
Yu Sugo; Keisuke Saito; Hiroshi Ishikita
Source:
Biochemistry 2022 v.61 no.17 pp. 1836-1843
ISSN:
1520-4995
Subject:
photosystem II,   etc   ; chlorophyll; molecular dynamics; quantum mechanics; quinones;     Show all 5 Subjects
Abstract:
... In photosystem II (PSII) and photosynthetic reaction centers from purple bacteria (PbRC), the electron released from the electronically excited chlorophyll is transferred to the terminal electron acceptor quinone, QB. QB accepts two electrons and two protons before leaving the protein. We investigated the molecular mechanism of quinone exchange in PSII, conducting molecular dynamics (MD) simulatio ...
DOI:
10.1021/acs.biochem.2c00324

2. Inference of photosynthetic capacity parameters from chlorophyll a fluorescence is affected by redox state of PSII reaction centers

Author:
Jimei Han; Lianhong Gu; Jiaming Wen; Ying Sun
Source:
Plant, cell and environment 2022 v.45 no.4 pp. 1298-1314
ISSN:
0140-7791
Subject:
photosystem II,   etc   ; carbon; carboxylation; chlorophyll; electron transfer; fluorescence;     Show all 6 Subjects
Abstract:
... Solar‐induced chlorophyll fluorescence (SIF) has been used to infer photosynthetic capacity parameters (e.g., the maximum carboxylation rate Vcₘₐₓ, and the maximum electron transport rate Jₘₐₓ). However, the precise mechanism and practical utility of such approach under dynamic environments remain unclear. We used the balance between the light and carbon reactions to derive theoretical equations r ...
DOI:
10.1111/pce.14271

3. Probing the proton release by Photosystem II in the S1 to S2 high-spin transition

Author:
Alain Boussac; Miwa Sugiura; Julien Sellés
Source:
Biochimica et biophysica acta 2022 v.1863 no.5 pp. 148546
ISSN:
0005-2728
Subject:
photosystem II,   etc   ; Thermosynechococcus elongatus; absorption; electron transfer; pH; stoichiometry;     Show all 6 Subjects
Abstract:
... The stoichiometry and kinetics of the proton release were investigated during each transition of the S-state cycle in Photosystem II (PSII) from Thermosynechococcus elongatus containing either a Mn₄CaO₅ (PSII/Ca) or a Mn₄SrO₅ (PSII/Sr) cluster. The measurements were done at pH 6.0 and pH 7.0 knowing that, in PSII/Ca at pH 6.0 and pH 7.0 and in PSII/Sr at pH 6.0, the flash-induced S₂-state is in a ...
DOI:
10.1016/j.bbabio.2022.148546

4. Tandem gene amplification restores photosystem II accumulation in cytochrome b559 mutants of cyanobacteria

Author:
Yi‐Fang Chiu; Han‐Yi Fu; Petra Skotnicová; Keng‐Min Lin; Josef Komenda; Hsiu‐An Chu
Source:
The new phytologist 2022 v.233 no.2 pp. 766-780
ISSN:
0028-646X
Subject:
photosystem II,   etc   ; gene amplification; heme; ligands; operon; sequence analysis;     Show all 6 Subjects
Abstract:
... Cytochrome (Cyt) b₅₅₉ is a key component of the photosystem II complex (PSII) that is essential for its proper functioning and assembly. Site‐directed mutants of the model cyanobacterium Synechocystis sp. PCC6803 with mutated heme axial ligands of Cyt b₅₅₉ have little PSII and are therefore unable to grow photoautotrophically. Here we describe two types of Synechocystis autotrophic transformants t ...
DOI:
10.1111/nph.17785

5. Psb34 protein modulates binding of high-light-inducible proteins to CP47-containing photosystem II assembly intermediates in the cyanobacterium Synechocystis sp. PCC 6803

Author:
Parisa Rahimzadeh-Karvansara; Guillem Pascual-Aznar; Martina Bečková; Josef Komenda
Source:
Photosynthesis research 2022 v.152 no.3 pp. 333-346
ISSN:
0166-8595
Subject:
photosystem II,   etc   ; Synechocystis; catalysts; chloroplasts; genes; radiation resistance; research;     Show all 7 Subjects
Abstract:
... Assembly of photosystem II (PSII), a water-splitting catalyst in chloroplasts and cyanobacteria, requires numerous auxiliary proteins which promote individual steps of this sequential process and transiently associate with one or more assembly intermediate complexes. In this study, we focussed on the role of a PSII-associated protein encoded by the ssl1498 gene in the cyanobacterium Synechocystis ...
DOI:
10.1007/s11120-022-00908-9

6. Electrochemically Driven Photosynthetic Electron Transport in Cyanobacteria Lacking Photosystem II

Author:
Christine M. Lewis; Justin D. Flory; Thomas A. Moore; Ana L. Moore; Bruce E. Rittmann; Wim F.J. Vermaas; César I. Torres; Petra Fromme
Source:
Journal of the American Chemical Society 2022 v.144 no.7 pp. 2933-2942
ISSN:
1520-5126
Subject:
photosystem II,   etc   ; Synechocystis; electrochemistry; electrodes; light intensity; photosynthetic electron transport;     Show all 6 Subjects
Abstract:
... Light-activated photosystem II (PSII) carries out the critical step of splitting water in photosynthesis. However, PSII is susceptible to light-induced damage. Here, results are presented from a novel microbial electro-photosynthetic system (MEPS) that uses redox mediators in conjunction with an electrode to drive electron transport in live Synechocystis (ΔpsbB) cells lacking PSII. MEPS-generated, ...
DOI:
10.1021/jacs.1c09291

7. “Invisible” Detergents Enable a Reliable Determination of Solution Structures of Native Photosystems by Small-Angle Neutron Scattering

Author:
M. Golub; J. Gätcke; S. Subramanian; A. Kölsch; T. Darwish; J. K. Howard; A. Feoktystov; O. Matsarskaia; A. Martel; L. Porcar; A. Zouni; J. Pieper
Source:
Journal of physical chemistry 2022 v.126 no.15 pp. 2824-2833
ISSN:
1520-5207
Subject:
photosystem II,   etc   ; crystallization; detergents; membrane proteins; neutrons; solar energy; temperature;     Show all 7 Subjects
Abstract:
... Photosystems I (PSI) and II (PSII) are pigment–protein complexes capable of performing the light-induced charge separation necessary to convert solar energy into a biochemically storable form, an essential step in photosynthesis. Small-angle neutron scattering (SANS) is unique in providing structural information on PSI and PSII in solution under nearly physiological conditions without the need for ...
DOI:
10.1021/acs.jpcb.2c01591

8. Growth and nutrition of rice seedlings when phosphorus or silicon was applied to a soil heavily contaminated with both arsenic and cadmium

Author:
Lalith Suriyagoda; Merle Tränkner; Klaus Dittert
Source:
Journal of plant nutrition 2022 v.45 no.12 pp. 1849-1865
ISSN:
1532-4087
Subject:
photosystem II,   etc   ; canopy; heavy metals; phosphorus; plant nutrition; rice; tillering;     Show all 7 Subjects
Abstract:
... There is a lack of affordable and effective strategies to mitigate multiple heavy metal contamination in lowland rice production. We tested phosphorus (P) or silicon (Si) addition to a soil contaminated with both arsenic (As) and cadmium (Cd) for their mitigation potential in rice seedlings. Rice variety IR64 was grown in pots with either P (0, 2.5, 5, 10, 20 (recommended rate), 40 and 80 mg P kg⁻ ...
DOI:
10.1080/01904167.2022.2027977

9. Psb27, a photosystem II assembly protein, enables quenching of excess light energy during its participation in the PSII lifecycle

Author:
Virginia M. Johnson; Sandeep Biswas; Johnna L. Roose; Himadri B. Pakrasi; Haijun Liu
Source:
Photosynthesis research 2022 v.152 no.3 pp. 297-304
ISSN:
0166-8595
Subject:
photosystem II,   etc   ; Synechocystis; energy; enzymes; fluorescence; half life; manganese; mutants; oxygen; research;     Show all 10 Subjects
Abstract:
... Photosystem II (PSII), the enzyme responsible for oxidizing water into molecular oxygen, undergoes a complex lifecycle during which multiple assembly proteins transiently bind to and depart from PSII assembly intermediate complexes. Psb27 is one such protein. It associates with the CP43 chlorophyll-binding subunit of PSII to form a Psb27-PSII sub-complex that constitutes 7–10% of the total PSII po ...
DOI:
10.1007/s11120-021-00895-3

10. Photoacclimation impacts the molecular features of photosystem supercomplexes in the centric diatom Thalassiosira pseudonana

Author:
Claudio Calvaruso; Konstantinos Stefanidis; Claudia Büchel
Source:
Biochimica et biophysica acta 2022 v.1863 no.7 pp. 148589
ISSN:
0005-2728
Subject:
photosystem II,   etc   ; Bacillariophyceae; Thalassiosira pseudonana; acclimation; chlorophyll; lutein; polypeptides; radiation resistance; thylakoids;     Show all 9 Subjects
Abstract:
... In diatoms, light-harvesting processes take place in a specific group of proteins, called fucoxanthin chlorophyll a/c proteins (FCP). This group includes many members and represents the major characteristic of the diatom photosynthetic apparatus, with specific pigments bound (chlorophyll c, fucoxanthin, diadino- and diatoxanthin besides chlorophyll a). In thylakoids, FCP and photosystems (PS) form ...
DOI:
10.1016/j.bbabio.2022.148589

11. Effect of protein matrix on CP29 spectra and energy transfer pathways

Author:
S. Petry; J.P. Götze
Source:
Biochimica et biophysica acta 2022 v.1863 no.2 pp. 148521
ISSN:
0005-2728
Subject:
photosystem II,   etc   ; Pisum sativum; energy transfer; glutamine; light harvesting complex; molecular dynamics; solvents;     Show all 7 Subjects
Abstract:
... We investigate energy transfer pathways between strongly coupled chlorophylls (Chls) in the CP29 (LHCII B4.1) antenna complex of Pisum sativum, including the possibility of higher energy states. We test for the environmental effects caused by the protein, membrane and solvent using a hybrid QM/MM approach. Classical molecular dynamics simulations of the full CP29 complex embedded in a DOPC membran ...
DOI:
10.1016/j.bbabio.2021.148521

12. Molecular Principles of Redox-Coupled Protonation Dynamics in Photosystem II

Author:
Friederike Allgöwer; Ana P. Gamiz-Hernandez; A. William Rutherford; Ville R. I. Kaila
Source:
Journal of the American Chemical Society 2022 v.144 no.16 pp. 7171-7180
ISSN:
1520-5126
Subject:
photosystem II,   etc   ; X-radiation; biomass; deprotonation; dissociation; energy conversion; ligands; oxidation; protonation; solvents;     Show all 10 Subjects
Abstract:
... Photosystem II (PSII) catalyzes light-driven water oxidization, releasing O₂ into the atmosphere and transferring the electrons for the synthesis of biomass. However, despite decades of structural and functional studies, the water oxidation mechanism of PSII has remained puzzling and a major challenge for modern chemical research. Here, we show that PSII catalyzes redox-triggered proton transfer b ...
DOI:
10.1021/jacs.1c13041

13. Multiyear CO2 elevation improves PSII efficiency in a japonica rice cultivar

Author:
Chunhua Lv; Yao Huang; Kai Yang; Jingrui Yang; Peipei Cao; Zhenghua Hu; Wenjuan Sun; Lingfei Yu
Source:
Crop science 2022 v.62 no.1 pp. 346-357
ISSN:
0011-183X
Subject:
photosystem II,   etc   ; Oryza sativa; carbon dioxide; cultivars; electron transfer; filling period; photochemistry; rice;     Show all 8 Subjects
Abstract:
... Responses of crop photosystem activity to the short‐term elevation of carbon dioxide concentration ([CO₂]) have been studied extensively. However, long‐term effects of elevated [CO₂] (e[CO₂]) over multiple cropping generations have received little attention. Using open‐top chambers (OTCs), we set up ambient [CO₂] (CK) and two multigeneration e[CO₂] treatments during rice (Oryza sativa L.) growing ...
DOI:
10.1002/csc2.20642

14. Effects of enhanced UV-B radiation on photosynthetic performance and non-photochemical quenching process of intertidal red macroalgae Neoporphyra haitanensis

Author:
Song Xue; Yu Zang; Jun Chen; Shuai Shang; Xuexi Tang
Source:
Environmental and experimental botany 2022 v.199 pp. 104888
ISSN:
0098-8472
Subject:
photosystem II,   etc   ; antheraxanthin; chloroplasts; littoral zone; lutein; macroalgae; radiation resistance; ultraviolet radiation; violaxanthin; zeaxanthin;     Show all 10 Subjects
Abstract:
... The effects of enhanced ultraviolet-B (UV-B, 280–320 nm) radiation reaching the Earth’s surface has become an important issue in terrestrial and marine ecosystems. Living in the land–marine boundary, intertidal macroalgae have various adaptive strategies to resist drastic environmental changes. In this study, we investigated the effects of enhanced UV-B radiation on the photosynthetic performance ...
DOI:
10.1016/j.envexpbot.2022.104888

15. pH-Dependent Regulation of Electron Flow in Photosystem II by a Histidine Residue at the Stromal Surface

Author:
Tomoyuki Kobayashi; Yuichiro Shimada; Ryo Nagao; Takumi Noguchi
Source:
Biochemistry 2022 v.61 no.13 pp. 1351-1362
ISSN:
1520-4995
Subject:
photosystem II,   etc   ; density functional theory; histidine; luminescence; mutants; pH; plastoquinones; protonation; redox potential; thylakoids;     Show all 10 Subjects
Abstract:
... In photosystem II (PSII), the secondary plastoquinone electron acceptor QB functions as a substrate that converts into plastoquinol upon its double reduction by electrons abstracted from water. It has been suggested that a histidine residue, D1-H252, which is located at the stromal surface near QB, is involved in the pH-dependent regulation of electron flow and proton transfer to QB. However, defi ...
DOI:
10.1021/acs.biochem.2c00150

16. Mass spectrometry analysis of the photosystem II assembly factor Psb27 revealed variations in its lipid modification

Author:
Jan Lambertz; Pasqual Liauw; Julian P. Whitelegge; Marc M. Nowaczyk
Source:
Photosynthesis research 2022 v.152 no.3 pp. 305-316
ISSN:
0166-8595
Subject:
photosystem II,   etc   ; Thermosynechococcus elongatus; ion exchange chromatography; lipoproteins; mass spectrometry; membrane proteins; research; thylakoids;     Show all 8 Subjects
Abstract:
... The assembly of large, multi-cofactor membrane protein complexes like photosystem II (PSII) requires a high level of coordination. The process is facilitated by a large network of auxiliary proteins that bind transiently to unassembled subunits, preassembled modules or intermediate states of PSII, which are comprised of a subset of subunits. However, analysis of these immature, partially assembled ...
DOI:
10.1007/s11120-021-00891-7

17. Melatonin delays leaf senescence and improves cucumber yield by modulating chlorophyll degradation and photoinhibition of PSII and PSI

Author:
Kun Liu; Tongtong Jing; Yanan Wang; Xizhen Ai; Huangai Bi
Source:
Environmental and experimental botany 2022 v.200 pp. 104915
ISSN:
0098-8472
Subject:
photosystem II,   etc   ; chlorophyll; chloroplasts; cucumbers; electron transfer; genes; greenhouses; leaves; melatonin; photoinhibition; protein degradation;     Show all 11 Subjects
Abstract:
... Decreases in chlorophyll and photosynthetic efficiency co-occur during aging and leaf senescence. Here, we report the positive functions of melatonin (MT) in delaying leaf senescence in cucumber plants. The results showed that natural leaf senescence induced the accumulation of endogenous MT and that spraying MT delayed leaf senescence in a concentration-dependent manner. Moreover, application of ...
DOI:
10.1016/j.envexpbot.2022.104915

18. Reactive oxygen species in photosystem II: relevance for oxidative signaling

Author:
Pavel Pospíšil; Aditya Kumar; Ankush Prasad
Source:
Photosynthesis research 2022 v.152 no.3 pp. 245-260
ISSN:
0166-8595
Subject:
photosystem II,   etc   ; biochemical compounds; chloroplasts; gene expression; oxidation; reactive oxygen species; research; signal transduction;     Show all 8 Subjects
Abstract:
... Reactive oxygen species (ROS) are formed in photosystem II (PSII) under various types of abiotic and biotic stresses. It is considered that ROS play a role in chloroplast-to-nucleus retrograde signaling, which changes the nuclear gene expression. However, as ROS lifetime and diffusion are restricted due to the high reactivity towards biomolecules (lipids, pigments, and proteins) and the spatial sp ...
DOI:
10.1007/s11120-022-00922-x

19. Temperature dependence of the formation of the g ~ 5 EPR signal in the oxygen evolving complex of photosystem II

Author:
Hiroyuki Mino
Source:
Photosynthesis research 2022 v.152 no.2 pp. 207-212
ISSN:
0166-8595
Subject:
photosystem II,   etc   ; activation energy; electron paramagnetic resonance spectroscopy; enthalpy; entropy; lighting; oxygen; research; temperature;     Show all 9 Subjects
Abstract:
... The temperature dependence of the formation of the g ~ 5 S₂ state electron paramagnetic resonance (EPR) signal in photosystem II (PSII) was investigated. The g ~ 5 signal was produced at an illumination above 200 K. The half inhibition temperature of the formation of the g ~ 5 EPR signal was approximately 215 K. The half inhibition temperature is close to that of the transition from the S₂ state-t ...
DOI:
10.1007/s11120-022-00916-9

20. Key physiological traits and chemical properties of extracellular polymeric substances determining colony formation in a cyanobacterium

Author:
Zhipeng Duan; Xiao Tan; Qingfei Zeng
Source:
Journal of oceanology and limnology 2022 v.40 no.5 pp. 1720-1731
ISSN:
2096-5508
Subject:
photosystem II,   etc   ; Microcystis; cross-linking reagents; fluorescence; limnology; oceanography; photosynthetic reaction centers; polymers; polysaccharides;     Show all 9 Subjects
Abstract:
... Colony formation of cyanobacteria is crucial for the formation of surface blooms in lakes. However, the underlying mechanisms of colony formation involving in physiological and cell surface characteristics remain to not well be established. Six cyanobacterial Microcystis strains (including both unicellular and colonial ones) were employed to estimate the influences of their physiological traits an ...
DOI:
10.1007/s00343-022-1353-5