NMR Investigation of the Electrostatic Effect in Binding of a Neuropeptide, Achatin-I, to Phosphatidylcholine Bilayers

2007 ◽  
Vol 111 (14) ◽  
pp. 3831-3838 ◽  
Author(s):  
Tomohiro Kimura ◽  
Keiko Ninomiya ◽  
Shiroh Futaki
Keyword(s):  
Electrostatic Effect

Elektrostatische Aktivierung der SNAr-Reaktivität durch Sulfonyloniosubstituenten/Electrostatic Activation of SNAr-Reactivity by Sulfonylonio Substituents

2001 ◽  
Vol 56 (12) ◽  
pp. 1360-1368 ◽  
Author(s):  
Robert Weiss ◽  
Frank Pühlhofer
Keyword(s):  
Room Temperature ◽  
Reaction Path ◽  
Mild Conditions ◽  
Electrostatic Effect

Abstract 4-Fluorobenzenesulfonyl chloride (1) and pentafluorobenzenesulfonyl chloride (2) are transformed into the corresponding N-sulfonylpyridinium triflates 4a-d by treatment with one equivalent of the reagent pair L/TMSOTf (L = 4-dimethylaminopyridine (DMAP), 4-ferf-butylpyridine (TBUPY), 1-methylimidazole (NMI); TMSOTf = trimethylsilyl triflate). Due to the electrostatic effect of the sulfonylonio function, SNAr reactions on these systems can be performed under mild conditions. So the reaction of 2 with excess DMAP/TMSOTf leads by way of peronio substitution to hexakis[(4-dimethylamino)-l-pyridinio]benzene hexa-kis(trifluoromethansulfonate) (7) [22] at room temperature. Additionally, a new reaction path to 4-(1-pyridinio)-substituted benzenesulfonamides, a class of pharmaceutically interesting substances, is shown.

Electrostatic Effect on the Hydration Layer of Colloidal Silica Particles

1994 ◽  
Vol 167 (1) ◽  
pp. 146-149 ◽  
Author(s):  
Shigeo Sasaki ◽  
Hiroshi Maeda
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Hydration Layer ◽  
Electrostatic Effect

Electrostatic effect on the flow behavior of a dilute gas/cohesive particle flow system

AIChE Journal ◽  
1996 ◽  
Vol 42 (6) ◽  
pp. 1590-1599 ◽  
Author(s):  
Yu-Feng Zhang ◽  
Yi Yang ◽  
Hamid Arastoopour
Keyword(s):  
Flow System ◽  
Flow Behavior ◽  
Particle Flow ◽  
Dilute Gas ◽  
Electrostatic Effect

THE QUANTITATIVE CALCULATION OF ELECTROSTATIC EFFECT ON THE pKa OF ACTIVE SITE RESIDUES IN ENZYMES

1989 ◽  
Vol 5 (04) ◽  
pp. 385-387
Author(s):  
Lai Luhua ◽  
◽  
Luo Yu ◽  
Xu Xiaojie ◽  
Shao Meicheg ◽  
...  
Keyword(s):  
Active Site ◽  
Active Site Residues ◽  
Quantitative Calculation ◽  
Electrostatic Effect

scholarly journals Elucidating the role of metal ions in carbonic anhydrase catalysis

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jin Kyun Kim ◽  
Cheol Lee ◽  
Seon Woo Lim ◽  
Aniruddha Adhikari ◽  
Jacob T. Andring ◽  
...  
Keyword(s):  
Carbonic Anhydrase ◽  
Metal Ions ◽  
Metal Ion ◽  
Catalytic Mechanism ◽  
Chemical Properties ◽  
Water Network ◽  
Native Metal ◽  
Trigonal Bipyramidal ◽  
Electrostatic Effect

Abstract Why metalloenzymes often show dramatic changes in their catalytic activity when subjected to chemically similar but non-native metal substitutions is a long-standing puzzle. Here, we report on the catalytic roles of metal ions in a model metalloenzyme system, human carbonic anhydrase II (CA II). Through a comparative study on the intermediate states of the zinc-bound native CA II and non-native metal-substituted CA IIs, we demonstrate that the characteristic metal ion coordination geometries (tetrahedral for Zn2+, tetrahedral to octahedral conversion for Co2+, octahedral for Ni2+, and trigonal bipyramidal for Cu2+) directly modulate the catalytic efficacy. In addition, we reveal that the metal ions have a long-range (~10 Å) electrostatic effect on restructuring water network in the active site. Our study provides evidence that the metal ions in metalloenzymes have a crucial impact on the catalytic mechanism beyond their primary chemical properties.

scholarly journals Electrostatic effect on off-field ferroelectric hysteresis loop in piezoresponse force microscopy

2020 ◽  
Vol 116 (17) ◽  
pp. 172901 ◽  
Author(s):  
Huimin Qiao ◽  
Owoong Kwon ◽  
Yunseok Kim
Keyword(s):  
Hysteresis Loop ◽  
Piezoresponse Force Microscopy ◽  
Ferroelectric Hysteresis Loop ◽  
Force Microscopy ◽  
Electrostatic Effect ◽  
Ferroelectric Hysteresis

scholarly journals A supramolecular radical cation: folding-enhanced electrostatic effect for promoting radical-mediated oxidation

2018 ◽  
Vol 9 (22) ◽  
pp. 5015-5020 ◽  
Author(s):  
Bohan Tang ◽  
Wan-Lu Li ◽  
Yang Jiao ◽  
Jun-Bo Lu ◽  
Jiang-Fei Xu ◽  
...  
Keyword(s):  
Radical Cation ◽  
Fenton Oxidation ◽  
Electrostatic Effect ◽  
Mediated Oxidation

A supramolecular strategy to fabricate a highly activated radical cation, leading to over 100 times acceleration of radical-mediated Fenton oxidation.

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