Water-Mediated Hydrogen-Bonded Network on the Cytoplasmic Side of the Schiff Base of the L Photointermediate of Bacteriorhodopsin†

Biochemistry ◽  
2003 ◽  
Vol 42 (48) ◽  
pp. 14122-14129 ◽  
Author(s):  
Akio Maeda ◽  
Judith Herzfeld ◽  
Marina Belenky ◽  
Richard Needleman ◽  
Robert B. Gennis ◽  
...  
Keyword(s):  
Schiff Base ◽  
Cytoplasmic Side ◽  
Hydrogen Bonded

A facile biomimetic catalytic activity through hydrogen atom abstraction by the secondary coordination sphere in manganese(iii) complexes

2020 ◽  
Vol 49 (40) ◽  
pp. 14216-14230
Author(s):  
Narayan Ch. Jana ◽  
Paula Brandão ◽  
Antonio Frontera ◽  
Anangamohan Panja
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Hydrogen Atom ◽  
Coordination Sphere ◽  
Hydrogen Atom Abstraction ◽  
Schiff Base Ligands ◽  
Secondary Coordination Sphere ◽  
Catalytic Reactivity ◽  
Hydrogen Bonded

Four hydrogen bonded supramolecular manganese(iii) complexes with N3O donor Schiff base ligands and a facile biomimetic catalytic reactivity through hydrogen atom abstraction by the secondary coordination sphere have been reported.

scholarly journals Crystal Structure of a Natural Light-Gated Anion Channelrhodopsin

2018 ◽  
Author(s):  
Hai Li ◽  
Chia-Ying Huang ◽  
Elena G. Govorunova ◽  
Christopher T. Schafer ◽  
Oleg A. Sineshchekov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Natural Light ◽  
X Ray ◽  
Anion Conductance ◽  
Guillardia Theta ◽  
Cytoplasmic Side

ABSTRACTThe anion channelrhodopsin GtACR1 from the alga Guillardia theta is a potent neuron-inhibiting optogenetics tool. Presented here, its X-ray structure at 2.9 Å reveals a tunnel traversing the protein from its extracellular surface to a large cytoplasmic cavity. The tunnel is lined primarily by small polar and aliphatic residues essential for anion conductance. A disulfide-immobilized extracellular cap facilitates channel closing and the ion path is blocked mid-membrane by its photoactive retinylidene chromophore and further by a cytoplasmic side constriction. The structure also reveals a novel photoactive site configuration that maintains the retinylidene Schiff base protonated when the channel is open. These findings suggest a new channelrhodopsin mechanism, in which the Schiff base not only controls gating, but also serves as a direct mediator for anion flux.

A theoretical insight on the rigid hydrogen-bonded network in the solid state structure of two zinc(ii) complexes and their strong fluorescence behaviors

CrystEngComm ◽  
2020 ◽  
Vol 22 (17) ◽  
pp. 3005-3019 ◽  
Author(s):  
Ipsita Mondal ◽  
Tanmoy Basak ◽  
Snehasis Banerjee ◽  
Shouvik Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Selective Detection ◽  
State Structure ◽  
Strong Fluorescence ◽  
Solid State Structure ◽  
Reduced Schiff Base ◽  
Theoretical Insight ◽  
Hydrogen Bonded

A reduced Schiff base used as a fluorescence chemo-sensor for selective detection of zinc(ii). Strong fluorescence behaviors of two zinc(ii) complexes are correlated with the presence of a rigid hydrogen-bonded network in their solid state structure.

scholarly journals Stabilization of two conformers via intra- or inter-molecular hydrogen bonds in a dinuclear vanadium(v) complex with a pendant Schiff base: theoretical insight

RSC Advances ◽  
2019 ◽  
Vol 9 (60) ◽  
pp. 35165-35175 ◽  
Author(s):  
Snehasish Thakur ◽  
Michael G. B. Drew ◽  
Antonio Franconetti ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Density Functional Theory ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Dft Calculations ◽  
Molecular Hydrogen ◽  
Density Functional ◽  
Functional Theory ◽  
Theoretical Insight ◽  
Hydrogen Bonded

Two different hydrogen bonded conformers coexist in a synthesized dinuclear oxovanadium(v) Schiff base. Density functional theory (DFT) calculations were utilized to calculate the energies involved in two different conformers.

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