Article
Chemistry, Inorganic & Nuclear
Patrik Torok, Duenpen Unjaroen, Flora Viktoria Csendes, Michel Giorgi, Wesley R. Browne, Jozsef Kaizer
Summary: The complex [FeIII2(mu-O-2)(L-3)(4)(S)(2)](4+) is a functional model of peroxo-diiron intermediates in oxidoreductase catalytic cycles, exhibiting nucleophilic, electrophilic oxidative reactivity, and electron transfer oxidation.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Williamson N. Oloo, Miklos Szavuly, Jozsef Kaizer, Lawrence Que
Summary: This study elucidates the substrate oxidations catalyzed by [Fe-II(IndH)(CH3CN)(3)](ClO4)(2) with H2O2, resulting in the formation of a spectroscopically characterized (mu-oxo)(mu-1,2-peroxo)diiron(III) intermediate capable of various oxidative reactions including epoxidation and hydroxylation.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Williamson N. Oloo, Miklos Szavuly, Jozsef Kaizer, Lawrence Que
Summary: This study describes a substrate oxidation reaction catalyzed by [Fe-II(IndH)(CH3CN)(3)](ClO4)(2) with H2O2, involving a spectroscopically characterized intermediate capable of olefin epoxidation and alkane hydroxylation. The research identified a direct nucleophilic attack of the substrate carbonyl group by the peroxo species. Additionally, the study found that the high-valent iron-oxo oxidant derived from O-O bond cleavage of the peroxo intermediate contributes to the oxidative reactivities associated with nonheme diiron enzymes.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yijing Wang, Lihua Dong, Hao Su, Yongjun Liu
Summary: In this study, the catalytic mechanism of SznF was investigated by constructing enzyme-substrate complex models and performing a series of calculations. The results showed that O2 activation starts from diiron(II,III)-superoxo and generates diiron(IV)-oxo species through a diiron(III,III)-peroxo-like transition state. The hydroxylation process was found to involve N delta-hydroxylation first and follows the H-abstraction/OH rebound mechanism. Additionally, the hydroxylation of N-methyl-L-arginine does not rely on diiron(III,III)-hydroperoxo to trigger the electrophilic attack of the guanidine.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Zhiping Ye, Guanjie Wang, Jean-marc Giraudon, Anton Nikiforov, Jun Chen, Liang Zhao, Xiuwen Zhang, Jiade Wang
Summary: The study found that the different crystal phases have a significant impact on the Cu-Mn catalytic ozonation of toluene, with the amorphous phase Cu0.2MnOx showing better catalytic performance.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Abdul K. Choudhury, Rudra Sarkar, Jagannath Bhuyan
Summary: This article reports on a new type of compound, a complex formed by the binding of magnesium porphyrin and histamine. The complex is stable and exhibits high antioxidant activity.
DALTON TRANSACTIONS
(2023)
Review
Environmental Sciences
Pijun Gong, Feng He, Junlin Xie, De Fang
Summary: Volatile organic compounds (VOCs) pose serious threats to human health and the ecological environment. Catalytic oxidation technology, due to its cost-effectiveness and high activity, is considered the most effective method for removing VOCs. This review summarizes the research progress in the catalytic oxidation of toluene using MnO2-based catalysts, including single MnO2, metal-doped MnO2, and supported MnO2 catalysts. The relationship between the chemical properties of MnO2 catalysts and toluene oxidation performance, as well as the catalytic reaction mechanisms, are focused on. Additionally, the effects of different crystal forms and morphologies on the catalytic toluene reaction are discussed, and the potential of MnO2 catalysts for the catalytic oxidation of toluene is proposed. The summary of these important findings is expected to serve as a valuable reference for the catalytic treatment of VOCs.
Article
Chemistry, Multidisciplinary
Jiarui Lu, Wenzhen Lai, Hui Chen
Summary: Through QM/MM modeling, it was discovered that C(sp(3))-H beta-hydroxylation in the diiron hydroxylase CmlA occurs through traceless amine-assisted O-2 activation. This unique mode of O-2 activation generates a diferric (Fe2O2)-O-III species instead of the conventional diferryl (Fe22O2)-O-IV species, resulting in a different C(sp(3))-H hydroxylation mechanism compared to other diiron hydroxylases. This substrate-modulated O-2 activation in CmlA has significant implications for understanding the mechanism of other diiron hydroxylases with similar amine groups adjacent to C-H bonds. Furthermore, the adapted coordination environment of the diiron cofactor upon O-2 binding in CmlA opens up possibilities for O-2 activation in non-heme diiron enzymes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Inorganic & Nuclear
Shiqing Zhang, Xinyi Li, Yijing Wang, Lijuan Yan, Jingjing Wei, Yongjun Liu
Summary: PtmU3 is a newly identified nonheme diiron monooxygenase with a special active site structure that can incorporate both atoms of a dioxygen molecule into substrates through successive reactions.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Atiya Banerjee, Qun Liu, John Shanklin, Mehmed Z. Ertem
Summary: This study investigates the electronic structures of nonheme diiron complexes by evaluating two key parameters, namely isomer shift (δ) and quadrupole splitting (ΔE(Q)), using density functional theory. The results show that the B97-D3/def2-TZVP model accurately predicts the δ and ΔE(Q) values for nonheme diiron complexes.
INORGANIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Molly J. McBride, Mrutyunjay A. Nair, Debangsu Sil, Jeffrey W. Slater, Monica E. Neugebauer, Michelle C. Y. Chang, Amie K. Boal, Carsten Krebs, J. Martin Bollinger
Summary: A newly discovered enzyme BesC from Streptomyces cattleya has been found to catalyze the biosynthesis of beta-ethynyl-L-serine. The enzyme can fragment 4-chloro-L-lysine and L-lysine itself, and the degradation of the intermediate formed during the reaction is influenced by the presence of different analogues. The study also suggests that hydrogen atom extraction plays a role in olefin formation.
Review
Biochemistry & Molecular Biology
Yerzhigit Tulebekov, Zhandos Orazov, Bagdat Satybaldiyev, Daniel D. Snow, Raphael Schneider, Bolat Uralbekov
Summary: There is currently no consensus on the reaction mechanisms for photocatalytic oxidation of airborne aromatic compounds like toluene. TiO2 or TiO2-based catalysts under UV/VIS illumination are commonly considered for removing these pollutants. The formation of intermediates and the deactivation of the catalyst during the oxidation process are discussed, highlighting the hazardous intermediates such as benzene and formaldehyde and the adsorbed intermediates leading to catalyst deactivation.
Article
Optics
Yi Yu, Aurimas Sakanas, Aref Rasoulzadeh Zali, Elizaveta Semenova, Kresten Yvind, Jesper Mork
Summary: Quantum noise is suppressed by a bound state in the continuum (BIC) approach, enabling a microlaser with narrow linewidth compared to other small lasers.
Article
Chemistry, Multidisciplinary
Alisa S. Sunagatullina, Ferdinand H. Lutter, Paul Knochel
Summary: In this study, various dialkylmagnesiums were synthesized by reacting primary or secondary alkyl iodides with sBu(2)Mg, and these reagents underwent diverse reactions with different compounds to yield stereodefined products. Mechanistic studies revealed that these reactions proceed via a radical pathway.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Inorganic & Nuclear
Lev E. Zelenkov, Anastasiya A. Eliseeva, Sergey V. Baykov, Vitalii V. Suslonov, Bartomeu Galmes, Antonio Frontera, Vadim Yu. Kukushkin, Daniil M. Ivanov, Nadezhda A. Bokach
Summary: Co-crystallization of dithiocarbamate complexes [M-II(S2CNEt2)(2)] (M = Cu 1, Ni 2, Pd 3, Pt 4) with 1,3,5-triiodotrifluorobenzene (FIB) forms an isomorphic series of co-crystals showing quadruple Cu/Ni/Pd/Pt isostructural exchange. The negative electrostatic potentials of Cu, Ni, Pd, and Pt decrease in the order Cu-II (-8.8) > Ni-II (-24.5) > Pd-II (-28.6) > Pt-II (-33.3 kcal mol(-1)), with Cu showing a shift from semicoordination to halogen bonding due to electron belt-to-s-hole switch. Semicoordinative contact Cu•••I is established by LP(I)-> LP*(Cu) charge transfer analysis. The more nucleophilic Pd and Pt centers exhibit unconventional metal-involving halogen bonding contacts with FIB, with the strongest interactions observed between Pt and the iodine(I)-based donors.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Biochemistry & Molecular Biology
Justin F. Acheson, Hannah Moseson, Brian G. Fox
Article
Biochemistry & Molecular Biology
Jacob L. W. Morgan, Justin F. Acheson, Jochen Zimmer
Article
Biochemistry & Molecular Biology
Lucas J. Bailey, Justin F. Acheson, Jason G. McCoy, Nathaniel L. Elsen, George N. Phillips, Brian G. Fox
Article
Biochemical Research Methods
Justin Yamada, Joshua L. Phillips, Samir Patel, Gabriel Goldfien, Alison Calestagne-Morelli, Hans Huang, Ryan Reza, Justin Acheson, Viswanathan V. Krishnan, Shawn Newsam, Ajay Gopinathan, Edmond Y. Lau, Michael E. Colvin, Vladimir N. Uversky, Michael F. Rexach
MOLECULAR & CELLULAR PROTEOMICS
(2010)
Article
Multidisciplinary Sciences
Taichi E. Takasuka, Justin F. Acheson, Christopher M. Bianchetti, Ben M. Prom, Lai F. Bergeman, Adam J. Book, Cameron R. Currie, Brian G. Fox
Article
Multidisciplinary Sciences
Justin F. Acheson, Lucas J. Bailey, Nathaniel L. Elsen, Brian G. Fox
NATURE COMMUNICATIONS
(2014)
Article
Biochemistry & Molecular Biology
Debayan Chaudhury, Ella R. Torkelson, Kaya A. Meyers, Justin F. Acheson, Leta Landucci, Yucen Pu, Zimou Sun, Marco Tonelli, Craig A. Bingman, Rebecca A. Smith, Steven D. Karlen, Shawn D. Mansfield, John Ralph, Brian G. Fox
Summary: Chemically labile ester linkages in lignin can be introduced through the synthesis of monolignol conjugates using acyltransferases. However, the presence of aromatic acid thioester donors in plants is limited, affecting the effectiveness of this strategy. To overcome this, aromatic acid CoA ligases involved in microbial aromatic degradation were identified, and four highly active enzymes capable of synthesizing aromatic acid CoA thioesters under mild aqueous conditions were identified.