Results 21 to 30 of about 202,648 (320)

Identification of the protonation and oxidation states of the oxygen-evolving complex in the low-dose X-ray crystal structure of photosystem II

Frontiers in Plant Science, 2023
In photosystem II (PSII), the O3 and O4 sites of the Mn4CaO5 cluster form hydrogen bonds with D1-His337 and a water molecule (W539), respectively. The low-dose X-ray structure shows that these hydrogen bond distances differ between the two homogeneous ...
Keisuke Saito, Keisuke Saito, Shu Nakao, Hiroshi Ishikita, Hiroshi Ishikita   +4 more
doaj   +1 more source

Synthesis, structure, and C–H bond activation reaction of an iron(IV) terminal imido complex bearing trifluoromethyl groups

Cell Reports Physical Science, 2021
Summary: Iron terminal imido species featuring electron-withdrawing N-substituents represent an important category of reactive metal-ligand-multiple-bond intermediates in iron-catalyzed reactions.
Qing Liu, Linhong Long, Pengchen Ma, Yingjie Ma, Xuebing Leng, Jie Xiao, Hui Chen, Liang Deng   +7 more
doaj   +1 more source

Symmetry of Hydrogen Bonds: Application of NMR Method of Isotopic Perturbation and Relevance of Solvatomers

Molecules, 2023
Short, strong, symmetric, low-barrier hydrogen bonds (H-bonds) are thought to be of special significance. We have been searching for symmetric H-bonds by using the NMR technique of isotopic perturbation.
Charles L. Perrin
doaj   +1 more source

Neutron structures of Leishmania mexicana triosephosphate isomerase in complex with reaction-intermediate mimics shed light on the proton-shuttling steps

IUCrJ, 2021
Triosephosphate isomerase (TIM) is a key enzyme in glycolysis that catalyses the interconversion of glyceraldehyde 3-phosphate and dihydroxyacetone phosphate.
Vinardas Kelpšas, Octav Caldararu, Matthew P. Blakeley, Nicolas Coquelle, Rikkert K. Wierenga, Ulf Ryde, Claes von Wachenfeldt, Esko Oksanen   +7 more
doaj   +1 more source

Low barrier hydrogen bonds in protein structure and function

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics, 2021
Low-barrier hydrogen bonds (LBHBs) are a special type of short hydrogen bond (HB) that is characterized by the equal sharing of a hydrogen atom. The existence and catalytic role of LBHBs in proteins has been intensely contested. Advancements in X-ray and neutron diffraction methods has revealed delocalized hydrogen atoms involved in potential LBHBs in ...
M Trent, Kemp, Eric M, Lewandowski, Yu, Chen   +2 more
openaire   +3 more sources

Remarkable Single Atom Catalyst of Transition Metal (Fe, Co & Ni) Doped on C₂N Surface for Hydrogen Dissociation Reaction

Nanomaterials, 2022
Currently, hydrogen is recognized as the best alternative for fossil fuels because of its sustainable nature and environmentally friendly processing. In this study, hydrogen dissociation reaction is studied theoretically on the transition metal doped ...
Ahmed Bilal Shah, Sehrish Sarfaraz, Muhammad Yar, Nadeem S. Sheikh, Hassan H. Hammud, Khurshid Ayub   +5 more
doaj   +1 more source

Molecular probe dynamics reveals suppression of ice-like regions in strongly confined supercooled water. [PDF]

PLoS ONE, 2012
The structure of the hydrogen bond network is a key element for understanding water's thermodynamic and kinetic anomalies. While ambient water is strongly believed to be a uniform, continuous hydrogen-bonded liquid, there is growing consensus that ...
Debamalya Banerjee, Shrivalli N Bhat, Subray V Bhat, Dino Leporini   +3 more
doaj   +1 more source

Intramolecular OHO Hydrogen Bonding in Dibenzoylmethane Enol: Raman Spectroscopic and Quantum Chemical Study

Micro, 2023
In the present work, the intramolecular O-H···O hydrogen bonding in 3-hydroxy-1,3-diphenylprop-2-en-1-one (keto-enol form of dibenzoylmethane, DBM) was investigated.
Boris A. Kolesov, Elena A. Pritchina, Aleksey Ya. Tikhonov   +2 more
doaj   +1 more source

Protonation Equilibrium in the Active Site of the Photoactive Yellow Protein

Molecules, 2021
The role and existence of low-barrier hydrogen bonds (LBHBs) in enzymatic and protein activity has been largely debated. An interesting case is that of the photoactive yellow protein (PYP).
Pablo Campomanes, Stefano Vanni
doaj   +1 more source

Proton-mediated photoprotection mechanism in photosystem II

Frontiers in Plant Science, 2022
Photo-induced charge separation, which is terminated by electron transfer from the primary quinone QA to the secondary quinone QB, provides the driving force for O2 evolution in photosystem II (PSII).
Yu Sugo, Hiroshi Ishikita, Hiroshi Ishikita   +2 more
doaj   +1 more source