Article
Plant Sciences
Liping Che, Han Meng, Junxiang Ruan, Lianwei Peng, Lin Zhang
Summary: RBD1 is crucial for PSII assembly in higher plants, as it not only contributes to the formation of functional PSII core complex, but also participates in the translation of D1 protein.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Martina Beckova, Roman Sobotka, Josef Komenda
Summary: The repair of photosystem II is crucial for the functionality of oxygenic photosynthesis. The study shows that the existence of a stable no reaction centre complex (NRC) is not supported, as each unassembled module remains separate and does not form a mutual complex.
PHOTOSYNTHESIS RESEARCH
(2022)
Article
Multidisciplinary Sciences
Guoqiang Huang, Yanan Xiao, Xiong Pi, Liang Zhao, Qingjun Zhu, Wenda Wang, Tingyun Kuang, Guangye Han, Sen-Fang Sui, Jian-Ren Shen
Summary: Psb27 is a small thylakoid lumen-localized protein that interacts with CP43 in the PSII complex, leading to conformational changes in other subunits and affecting the biogenesis and repair of PSII.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Shishang Dong, Guoqiang Huang, Changhui Wang, Jiajia Wang, Sen-Fang Sui, Xiaochun Qin
Summary: Photosynthesis is a vital process that converts light energy into chemical energy to support life on earth. This study presents cryo-EM structures of the CabRC reaction center, revealing its composition and functional characteristics, and providing insights into the evolutionary origin and adaptation of photosynthetic reaction centers.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Shiun-Jr Yang, Eric A. Arsenault, Kaydren Orcutt, Masakazu Iwai, Yusuke Yoneda, Graham R. Fleming
Summary: This study used 2DEV spectroscopy to analyze the spinach PSII-CC, revealing details about its dynamics and energy transfer. The study found that the dominant dynamics of the PSII-CC vary in different excitation energy regions. By separating these regions and identifying the roles of key pigments, a better understanding of the working mechanism of photosystem II can be obtained.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Mathematics
Denis D. Chesalin, Roman Y. Pishchalnikov
Summary: In this study, the optical properties of photosystem II reaction center were investigated using differential evolution algorithm. The results showed that the DE/rand-to-best/1/exp strategy accurately fitted the spectra of PSIIRC.
Review
Plant Sciences
Yang Chen, Boran Xu, Ruoqing Yao, Changhui Chen, Chunxi Zhang
Summary: The oxygen-evolving center in photosystem II plays a crucial role in the water splitting reaction of artificial photosynthesis. However, the lack of a precise chemical model has hindered the understanding of its structure-function relationship. Recent advances in synthesizing artificial clusters that closely mimic the oxygen-evolving center have provided an opportunity to study its structure-function relationship and design efficient catalysts for water splitting in artificial photosynthesis.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Caihuang Xu, Qingjun Zhu, Jing-Hua Chen, Liangliang Shen, Xiaohan Yi, Zihui Huang, Wenda Wang, Min Chen, Tingyun Kuang, Jian-Ren Shen, Xing Zhang, Guangye Han
Summary: Photosystem I (PSI) is a large protein supercomplex involved in light-dependent oxidation and reduction processes. A study on PSI structure from Chl d-dominated cyanobacterium Acaryochloris marina revealed a unique composition of electron transfer chain, providing insights into the mechanism of photosynthesis utilizing Chl d as the primary pigment and absorbing far-red light.
JOURNAL OF INTEGRATIVE PLANT BIOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Boris K. Semin, Lira N. Davletshina
Summary: Ca-depleted photosystem II membranes obtained by treatment with acidic buffer lack Ca2+ in the Mn4CaO5 cluster, but contain all extrinsic proteins protecting this cluster (PSII(-Ca/low pH)). Unlike native photosystem II, the Mn cluster in PSII(-Ca/low pH) samples can be reduced by small-sized reductants. By substituting Mn cation(s) with Fe cation(s) at pH 6.5, a chimeric cluster (3Mn1Fe) was obtained in PSII(-Ca/low pH) membranes containing extrinsic proteins. The resulting membranes exhibited high intensity O-2 evolution in the presence of exogenous Ca2+, reaching about 80% of the rate in PSII(-Ca/low pH) membranes.
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Shinya Adachi, Akira Saito, Masakatsu Shibasaki
Summary: This study reports a method for direct catalytic asymmetric reactions of alkylnitriles and imines. By adding specific catalysts and additives, high yields, high anti/syn diastereoselectivities, and high enantiomeric ratios can be achieved.
Article
Chemistry, Multidisciplinary
Nilankar Diyali, Meena Chettri, Subhajit Saha, Ankita Saha, Subhankar Kundu, Debasish Mondal, Debasis Dhak, Bhaskar Biswas
Summary: A water-stable and structurally-characterized copper(II) complex with an N,N-chelator and an ancillary ligand was synthesized, forming a long-range supramolecular framework. The copper catalyst exhibited excellent electrocatalytic hydrogen production activity in acidic water.
Article
Multidisciplinary Sciences
Katherine H. Richardson, John J. Wright, Mantas Simenas, Jacqueline Thiemann, Ana M. Esteves, Gemma McGuire, William K. Myers, John J. L. Morton, Michael Hippler, Marc M. Nowaczyk, Guy T. Hanke, Maxie M. Roessler
Summary: Photosynthetic Complex I (PS-CI) links the oxidation of ferredoxin and reduction of plastoquinone to proton pumping across thylakoid membranes, generating ATP in photosynthesis. By overcoming challenges, the authors determined the reduction potentials of PS-CI's iron-sulfur clusters, providing insight into the bioenergetics of the electron transfer relay.
NATURE COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Ying Chen, Wataru Yamori, Ayumi Tanaka, Ryouichi Tanaka, Hisashi Ito
Summary: During leaf senescence, the degradation of photosystems and photosynthetic pigments proceeds in a coordinated manner, with the degradation of photosystem II core complexes regulated independently of the major chlorophyll degradation pathway. The study provides insights into the complex molecular mechanisms underlying the degradation of photosystems, which is an essential step during leaf senescence.
Review
Plant Sciences
Yi-Fang Chiu, Hsiu-An Chu
Summary: This article provides an overview of the latest research progress on the structural and functional roles of Cytb(559) in photosystem II, highlighting the importance of cytochrome b(559) in the early assembly of photosystem II and secondary electron transfer pathways.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Gabor Sipka, Melinda Magyar, Alberto Mezzetti, Parveen Akhtar, Qingjun Zhu, Yanan Xiao, Guangye Han, Stefano Santabarbara, Jian-Ren Shen, Petar H. Lambrev, Gyozo Garab
Summary: The study reveals that the light-adapted charge-separated state in PSII undergoes a transition from the closed state, contributing to variable chlorophyll-a fluorescence and involving complex photochemical and photophysical reactions. The highest fluorescence level is associated with the light-adapted state rather than the closed state, challenging the traditional understanding of fluorescence parameters in PSII quantum efficiency assessment.
Review
Biochemistry & Molecular Biology
Jean-David Rochaix, Roberto Bassi
BIOCHEMICAL JOURNAL
(2019)
Article
Plant Sciences
Hai-Bo Xiong, Jing Wang, Chao Huang, Jean-David Rochaix, Fei-Min Lin, Jia-Xing Zhang, Lin-Shan Ye, Xiao-He Shi, Qing-Bo Yu, Zhong-Nan Yang
Article
Biochemistry & Molecular Biology
Bei Liu, Di Zhang, Ming Sun, Manli Li, Xiqing Ma, Shangang Jia, Peisheng Mao
Summary: The color transition of oat bracts from green to black during grain development affects photosynthetic physiology, with changes in PSII efficiency, chlorophyll content, and anthocyanin biosynthesis pathway observed. This study highlights the impact of bract color change on photosynthesis and provides insights into the molecular mechanisms involved in this process.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Review
Biochemistry & Molecular Biology
Jean-David Rochaix
Summary: Most chloroplast proteins are nucleus-encoded and imported into chloroplasts via TOC and TIC. TOC and TIC form a supercomplex with a protein channel for protein import. Components of the TOC/TIC system have additional roles in chloroplast gene expression and metabolism. Chaperones and co-chaperones associated with TOC and TIC participate in protein folding and function in protein quality control. Chloroplast protein import is linked to retrograde signaling.
Article
Multidisciplinary Sciences
Hao Liu, Anjie Li, Rochaix Jean-David, Zhenfeng Liu
Summary: Chloroplasts import nuclear-encoded proteins using translocon complexes in the outer and inner envelope membranes. The structure of the TOC-TIC supercomplex from Chlamydomonas reinhardtii has been determined, revealing the overall architecture and protein organization. The presence of an inositol hexaphosphate molecule and lipid molecules within the supercomplex suggests their role in stabilizing the assembly and supporting preprotein translocation.
Article
Plant Sciences
Yonghong Li, Lin Zhang, Yurou Shen, Lianwei Peng, Fudan Gao
Summary: Thiol/disulfide-based redox regulation is essential for controlling the activity of target proteins in plant chloroplasts in response to light signals. In this study, the role of CBSX2 in the oxidation of redox-regulated enzymes in chloroplasts was investigated. The results suggest that CBSX2 participates in the oxidation of these enzymes in darkness, probably through regulation of the activity of chloroplast redox systems in vivo.
Article
Plant Sciences
Jianghao Wu, Liwei Rong, Weijun Lin, Lingxi Kong, Dengjie Wei, Lixin Zhang, Jean-David Rochaix, Xiumei Xu
Summary: Photosynthetic organisms perform state transitions in response to changing light conditions to optimize photosynthetic yield and reduce photo-damage. The protein kinase STN7 phosphorylates the light-harvesting complex of photosystem II and interacts with lumen thiol oxidoreductase 1 (LTO1) to maintain its active state through redox interactions between conserved cysteines. Loss of LTO1 affects the kinase activity of STN7 in Arabidopsis.