Article
Plant Sciences
Khetpakorn Chakarawet, Richard J. J. Debus, R. David Britt
Summary: The D1-D170 residue plays a crucial role in linking Mn ions with the Ca ion in the Mn4CaO5 cluster of Photosystem II. However, the D1-D170E mutation alters the equilibrium between different Jahn-Teller conformers of the S-1 state and leads to the production of a high-spin form of the S-2 state instead of the low-spin form observed in the wild-type. EPR spectroscopy confirms that the D1-D170E mutant produces a high-spin form of the S-2 state, providing experimental evidence for the change in S state conformers.
PHOTOSYNTHESIS RESEARCH
(2023)
Review
Plant Sciences
Nicholas Oliver, Anton P. Avramov, Dennis J. Nuernberg, Holger Dau, Robert L. Burnap
Summary: This review discusses the structure and formation of the manganese cluster of photosystem II and its relationship with different Mn oxides. It also considers the evolutionary origin of Mn4CaO5 and the functional role of Ca2+ in the process.
PHOTOSYNTHESIS RESEARCH
(2022)
Article
Chemistry, Physical
Manoj Mandal, Keisuke Saito, Hiroshi Ishikita
Summary: The replacement of Ca2+ with other alkaline earth metals in photosystem II (PSII) leads to structural changes in the H-bond network and the catalytic cluster, affecting O2 evolution.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Younes Mousazade, Subhajit Nandy, Rahman Bikas, Pavlo Aleshkevych, Keun Hwa Chae, Milosz Siczek, Tadeusz Lis, Suleyman I. Allakhverdiev, Mohammad Mahdi Najafpour
Summary: In the context of energy storage, the oxygen-evolution reaction (OER) through water-oxidation is an uphill reaction. Copper(II) coordination compounds have been widely used for OER, but understanding the mechanism in the presence of these compounds remains a challenge. This study investigates the electrochemical OER activity of a copper(II) coordination compound at pH 7 and focuses on the decomposition process.
DALTON TRANSACTIONS
(2022)
Article
Multidisciplinary Sciences
Yuichiro Shimada, Takehiro Suzuki, Takumi Matsubara, Tomomi Kitajima-Ihara, Ryo Nagao, Naoshi Dohmae, Takumi Noguchi
Summary: The authors find that certain amino acid residues at the ligand sites of the Mn cluster can be posttranslationally converted to the original carboxylate residues, which may have contributed to the evolution of photosynthetic oxygen evolution.
NATURE COMMUNICATIONS
(2022)
Article
Plant Sciences
B. K. Semin, L. N. Davletshina, S. N. Goryachev, M. Seibert
Summary: The study demonstrates that Fe(II) cations efficiently bind to the high-affinity, Mn-binding site in PSII membranes, affecting the charge recombination rate. Calcium depletion or rebinding significantly influences the location and ligand composition of one Mn cation in the Mn4CaO5 cluster.
PHOTOSYNTHESIS RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Anup Paul, Kristina Radinovic, Susanta Hazra, Dusan Mladenovic, Biljana Sljukic, Rais Ahmad Khan, Maria Fatima C. Guedes da Silva, Armando J. L. Pombeiro
Summary: The newly synthesized 3D coordination polymer Mn-CP showed good catalytic performance for oxygen reduction, with a distinct reduction peak observed in 0.1 M KOH but no activity in 0.5 M H2SO4. Additionally, it demonstrated significant activity towards oxygen evolution and hydrogen evolution in acidic media.
Article
Biochemistry & Molecular Biology
Christopher J. Gisriel, Gaozhong Shen, Ming-Yang Ho, Vasily Kurashov, David A. Flesher, Jimin Wang, William H. Armstrong, John H. Golbeck, Marilyn R. Gunner, David J. Vinyard, Richard J. Debus, Gary W. Brudvig, Donald A. Bryant
Summary: Far-red light photoacclimation expands the range of photosynthetically active radiation for terrestrial cyanobacteria, providing a growth advantage. This process modifies the structure of photosystem II and lowers the energy required for water oxidation.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Marcel Risch, Dulce M. Morales, Javier Villalobos, Denis Antipin
Summary: The rational improvement of electrocatalyst materials is crucial for implementing chemical energy storage for a sustainable energy supply. The combination of electrochemical methods and X-ray absorption spectroscopy can provide insights into the nature of these materials under reaction conditions. In this article, the authors introduce the concepts of electrochemistry and X-ray absorption spectroscopy, discuss the changes that electrocatalytic materials undergo, and provide examples using Mn oxides. They also highlight the current state of combining these methods to elucidate active states and discuss potential opportunities for understanding electrocatalysis mechanisms.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Masrat Bashir, Aijaz A. Dar, Imtiyaz Yousuf
Summary: This work focuses on the synthesis, characterization, and biological profile of Mn(II)- and Zn(II)-based complexes derived from a specific ligand. The structural and electronic properties were studied, and the stability of crystal lattice structures was investigated. The complexes showed avid binding to DNA and exhibited antioxidant and antibacterial activities. Furthermore, the polymeric Zn(II) complex exhibited selective cytotoxicity against a lung cancer cell line.
Review
Chemistry, Inorganic & Nuclear
Ayyan Ghosh, Sreeja Dasgupta, Animesh Kundu, Sukanta Mandal
Summary: Water oxidation is a critical step in hydrogen production and developing efficient catalysts has been a major focus. Ruthenium-based catalysts have attracted attention for their excellent catalytic performance. The performance of a catalyst depends on the ligand design, and the secondary coordination sphere also plays a significant role in catalysis. The use of secondary interactions has led to the development of milestone ruthenium-based catalysts with remarkable turnover frequencies. This paper discusses the effect of secondary interactions on the kinetics of water oxidation and explores their use in anchoring molecular catalysts to solid surfaces. The goal is to provide an overview of outer-sphere engineering's positive impact on water oxidation reactivity, guiding the development of advanced catalysts.
DALTON TRANSACTIONS
(2022)
Article
Spectroscopy
Abdul G. Al Lafi, Jamal Al Abdullah, Yusr Amin, Yara Aljbai, Hussam Allham, Asmhan Obiad
Summary: Fourier Transform Infra-Red (FTIR) spectroscopy is an important technique for understanding the structure of adsorbents and designing improved ion exchange materials. This study investigates the adsorption mechanism of U(VI)/Th(IV) and Ra(II)/Ba(II) radionuclide couples on polystyrene nano manganese dioxide (PS-NMO) composite, focusing on the effect of working solution pH. The results show that the separation of U(VI)/Th(IV) and Ra(II)/Ba(II) couples can be effectively achieved at specific pH values, and the pH also affects the structure of the composite adsorbent. FTIR spectroscopy reveals the formation of different complexes and changes in the composite structure in response to metal ions.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Spectroscopy
Evgeniy A. Paukshtis, Evgenii V. Kovalyov, Tatiana S. Glazneva, Sergei G. Kazarian
Summary: A new approach using a mirror sub-strate for infrared spectroscopic analysis of fiberglass materials enables detection of hard-to-analyze research samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Multidisciplinary Sciences
Rosario Javier-Astete, Jessenia Melo, Jorge Jimenez-Davalos, Gaston Zolla
Summary: This study validated a model for the classification of wood species and a universal model for the rapid determination of cellulose, hemicellulose, and lignin using FTIR spectroscopy coupled with chemometrics. The results showed that the full spectra can be used to differentiate different species and identify infrared peaks associated with cellulose, hemicellulose, and lignin. In addition, the full spectra helped build a three species universal model for quantifying the principal wood chemical components. Therefore, the study demonstrated that FTIR-ATR, together with chemometrics, is a reliable method for discriminating wood species and determining wood chemical composition.
SCIENTIFIC REPORTS
(2023)
Article
Plant Sciences
Hiroyuki Mino, Mizue Asada
Summary: This study identified two Mn2+ sites in PSII using PELDOR, with one Mn2+ ion binding to apo-PSII during deactivation of the oxygen-evolving complex. The site between His332 and Glu189 in the D1 polypeptide was found to be in close proximity to the Mn1 site in mature PSII. Additionally, the position between Asp170 and Glu189 in the D1 polypeptide was suggested as a potential initial high-affinity site for photoactivation based on comparisons with electron microscope structures.
PHOTOSYNTHESIS RESEARCH
(2022)
Article
Plant Sciences
Chiou-Rong Sheue, Jian-Wei Liu, Jia-Fang Ho, Ai-Wen Yao, Yeh-Hua Wu, Sauren Das, Chi-Chu Tsai, Hsiu-An Chu, Maurice S. B. Ku, Peter Chesson
AMERICAN JOURNAL OF BOTANY
(2015)
Article
Biochemistry & Molecular Biology
Jine-Yung Huang, Yi-Fang Chiu, Jose M. Ortega, Hsing-Ting Wang, Tien-Sheng Tseng, Shyue-Chu Ke, Mercedes Roncel, Hsiu-An Chu
Review
Plant Sciences
Hsiu-An Chu, Yi-Fang Chiu
FRONTIERS IN PLANT SCIENCE
(2016)
Article
Plant Sciences
J. -Y. Huang, N. -T. Hung, K. -M. Lin, Y. -F. Chiu, H. -A. Chu
Article
Biochemistry & Molecular Biology
Yi-Fang Chiu, Yung-Han Chen, Mercedes Roncel, Preston L. Dilbeck, Jine-Yung Huang, Shyue-Chu Ke, Jose M. Ortega, Robert L. Burnap, Hsiu-An Chu
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
(2013)
Article
Plant Sciences
Kaichiro Endo, Koichi Kobayashi, Hsing-Ting Wang, Hsiu-An Chu, Jian-Ren Shen, Hajime Wada
PHOTOSYNTHESIS RESEARCH
(2019)
Article
Plant Sciences
Y. -T. Chen, C. -H. Shen, W. -D. Lin, H. -A. Chu, B. -L. Huang, C. -I Kuo, K. -W. Yeh, L. -C. Huang, I. -F. Chang
Article
Plant Sciences
Tung-Hei Wang, Yung-Han Chen, Jine-Yung Huang, Kang-Cheng Liu, Shyue-Chu Ke, Hsiu-An Chu
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2011)
Article
Microbiology
Yen- Cheng, Lin Chou, Yi-Fang Chiu, Hsin-Ta Hsueh, Chih-Horng Kuo, Hsiu-An Chu
FRONTIERS IN MICROBIOLOGY
(2020)
Article
Plant Sciences
Yi-Fang Chiu, Han-Yi Fu, Petra Skotnicova, Keng-Min Lin, Josef Komenda, Hsiu-An Chu
Summary: Mutations in the cytochrome (Cyt) b(559) of cyanobacteria lead to PSII deficiency and inability to grow photoautotrophically, but transformants with tandem gene amplification can restore PSII accumulation and achieve photoautotrophic growth.
Article
Microbiology
Yen- Cheng, Yu-Chen Lin, Jyh-Yih Leu, Chih-Horng Kuo, Hsiu-An Chu
Summary: This study conducted whole-genome sequencing of Thermosynechococcus to explore the genetic differentiation among strains of this genus. The results revealed gene content divergence congruent with core genome phylogeny and provided valuable resources for future functional characterization.
FRONTIERS IN MICROBIOLOGY
(2022)
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)
Proceedings Paper
Engineering, Biomedical
Pu-Sung Huang, Ting-Ru Lin, Hsiu-An Chu, Chih-Ting Lin
2014 IEEE INTERNATIONAL SYMPOSIUM ON BIOELECTRONICS AND BIOINFORMATICS (ISBB)
(2014)
Article
Plant Sciences
Hsiu-An Chu, Ing-Feng Chang, Chin-Hui Shen, Yu-Ting Chen, Hsing-Ting Wang, Li-Chun Huang, Kai-Wun Yeh
