Results 1 to 10 of about 218,969 (305)

Low-Barrier Hydrogen Bond in Fujikurin A-D: A Computational Study. [PDF]

open access: goldACS Omega, 2022
The compounds Fujikurin A, B, and D, recently isolated from Fusarium fujikuroi, possess intramolecular low-barrier hydrogen bonds (LBHBs), which are hydrogen bonds with a very low-energy barrier for proton transfer. The isolated compounds have a hydrogen-bonded proton that appears to rapidly switch between two equilibrium states via a transition state (
Tanaka H   +3 more
europepmc   +4 more sources

Ligand-Induced Proton Transfer and Low-Barrier Hydrogen Bond Revealed by X-ray Crystallography. [PDF]

open access: greenJ Am Chem Soc, 2015
Ligand binding can change the pKa of protein residues and influence enzyme catalysis. Herein, we report three sub-Angstrom resolution X-ray crystal structures of CTX-M \u3b2-lactamase, representing three stages of the enzymatic pathway, apo protein (0 ...
Nichols DA   +10 more
europepmc   +6 more sources

Vibrational analysis on the revised potential energy curve of the low-barrier hydrogen bond in photoactive yellow protein [PDF]

open access: goldComputational and Structural Biotechnology Journal, 2016
Photoactive yellow protein (PYP) has a characteristic hydrogen bond (H bond) between p-coumaric acid chromophore and Glu46, whose OH bond length has been observed to be 1.21 Å by the neutron diffraction technique [Proc. Natl. Acad. Sci.
Yusuke Kanematsu   +3 more
doaj   +4 more sources

Pseudo-Jahn-Teller origin of the low barrier hydrogen bond in N2H7+ [PDF]

open access: greenThe Journal of Chemical Physics, 2008
The microscopic origin and quantum effects of the low barrier hydrogen bond (LBHB) in the proton-bound ammonia dimer cation N2H7+ were studied by means of ab initio and density-functional theory(DFT) methods.
Pablo García‐Fernández   +5 more
core   +10 more sources

Contribution of a low-barrier hydrogen bond to catalysis is not significant in ketosteroid isomerase. [PDF]

open access: bronzeMol Cells, 2015
Low-barrier hydrogen bonds (LBHBs) have been proposed to have important influences on the enormous reaction rate increases achieved by many enzymes. Δ(5)-3-ketosteroid isomerase (KSI) catalyzes the allylic isomerization of Δ(5)-3-ketosteroid to its conjugated Δ(4)-isomers at a rate that approaches the diffusion limit. Tyr14, a catalytic residue of KSI,
Jang DS   +7 more
europepmc   +8 more sources

Direct evidence of a low barrier hydrogen bond in the catalytic triad of a Serine protease. [PDF]

open access: goldSci Rep, 2018
AbstractSerine proteases are one of the largest groups of enzymes, found in both eukaryotes and prokaryotes, and are responsible for many different functions. The detailed information about the hydrogen-bonds in the catalytic triad (Asp…His…Ser) of these enzymes is of importance in order to fully understand the mechanism of action. The aspartate of the
Agback P, Agback T.
europepmc   +5 more sources

A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad. [PDF]

open access: goldSci Adv, 2018
Substrate participation in forming a catalytic triad aids in antibiotic resistance by aminoglycoside N3 -acetyltransferases.
Kumar P, Serpersu EH, Cuneo MJ.
europepmc   +6 more sources

Distinction between low-barrier hydrogen bond and ordinary hydrogen bond: a case study of varying nature of charge assisted hydrogen bonds of diglycine perchlorate crystal [PDF]

open access: goldMaterials Research Express, 2023
Hydrogen bonding is a complex phenomenon that is a resultant of many energy components like the electrostatic, dispersive, covalent, charge cloud overlap repulsion etc, nature of hydrogen bond (H-bond) depends on which of these components play a dominant
Rajul Ranjan Choudhury   +2 more
doaj   +2 more sources

Low-barrier hydrogen bond in photoactive yellow protein [PDF]

open access: greenProceedings of the National Academy of Sciences, 2009
Low-barrier hydrogen bonds (LBHBs) have been proposed to play roles in protein functions, including enzymatic catalysis and proton transfer. Transient formation of LBHBs is expected to stabilize specific reaction intermediates. However, based on experimental results and theoretical considerations, arguments against the importance of LBHB in proteins ...
Shigeo Yamaguchi   +7 more
openalex   +5 more sources

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