Results 11 to 20 of about 218,969 (305)
Absorption wavelength along chromophore low-barrier hydrogen bonds
iScience, 2022 Summary: In low-barrier hydrogen bonds (H-bonds), the pKa values for the H-bond donor and acceptor moieties are nearly equal, whereas the redox potential values depend on the H+ position. Spectroscopic details of low-barrier H-bonds remain unclear. Here,
Masaki Tsujimura +3 more
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Breaking the low barrier hydrogen bond in a serine protease [PDF]
Protein Science, 1999 AbstractThe serine protease subtilisin BPN' is a useful catalyst for peptide synthesis when dissolved in high concentrations of a water‐miscible organic co‐solvent such as N, N‐dimethylformamide (DMF). However, in 50% DMF, the kcat for amide hydrolysis is two orders of magnitude lower than in aqueous solution.
Richard Kidd +5 more
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An N⋯H⋯N low-barrier hydrogen bond preorganizes the catalytic site of aspartate aminotransferase to facilitate the second half-reaction. [PDF]
Chem Sci, 2022 Drago VN +9 more
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Release of a Proton and Formation of a Low-Barrier Hydrogen Bond between Tyrosine D and D2-His189 in Photosystem II. [PDF]
ACS Phys Chem Au, 2022 Mandal M, Saito K, Ishikita H.
europepmc +2 more sources
(15)N and (1)H Solid-State NMR Investigation of a Canonical Low-Barrier Hydrogen-Bond Compound: 1,8-Bis(dimethylamino)naphthalene. [PDF]
J Phys Chem B, 2015 White PB, Hong M.
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Short hydrogen bonds in the catalytic mechanism of serine proteases [PDF]
Journal of the Serbian Chemical Society, 2008 The survey of crystallographic data from the Protein Data Bank for 37 structures of trypsin and other serine proteases at a resolution of 0.78–1.28 Å revealed the presence of hydrogen bonds in the active site of the enzymes, which are formed between the ...
VLADIMIR LESKOVAC +4 more
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Angewandte Chemie International Edition, 2017 AbstractWhile NMR and IR spectroscopic signatures and structural characteristics of low‐barrier hydrogen bond (LBHB) formation are well documented in the literature, direct measurement of the LBHB energy is difficult. Here, we show that solid‐state 17O NMR spectroscopy can provide unique information about the energy required to break a LBHB.
Jiasheng Lu +5 more
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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 +4 more
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, 2023 Free-base corroles have long been known to be acidic, readily undergoing deprotonation by mild bases and in polar solvents. The conjugate base, however, has not been structurally characterized until now. Presented here is a first crystal structure of a
Conradie, Jeanet +4 more
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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
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