scholarly journals Crystal structure of a natural light-gated anion channelrhodopsin

eLife ◽  
2019 ◽  
Vol 8 ◽  
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

The 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.

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.

Synthesis of an Unprecedented H-stitched Binuclear Crystal Structure Based on Selective Fluorescence Recognition of Zn2+ in Newly Synthesized Schiff Base Ligand with DFT and Imaging Application in Living Cells

2021 ◽  
Author(s):  
SOUMYA SUNDAR MATI ◽  
Dr. SAUGATA KONAR ◽  
BOBY SAMAI
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Binuclear Complex ◽  
Living Cells ◽  
X Ray Diffraction ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Imaging Application

A zinc coordinated rare binuclear complex was synthesised and characterized by elemental analysis and single-crystal X-ray diffraction. Two mononuclear units formed by two Schiff base ligands 2-((2-(pyrimidin-2-yl)hydrazono)methyl)phenol (PHP) coordinated with...

scholarly journals Synthesis, Characterization, and Crystal Structure of [Co4(CH3CO2)2L4]2[BPh4]4·0.5H2O, Where HL = 4-(Salicylaldiminato)antipyrine

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Ramadan M. El-mehdawi ◽  
Abdussalam N. EL-dewik ◽  
Mufida M. Ben-Younes ◽  
Fathia A. Treish ◽  
Ramadan G. Abuhmaiera ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Title Complex ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Tridentate Schiff Base

The title complex was isolated as a red solid from the reaction of 4-(salicylaldiminato)antipyrine, HL, and cobalt (II) acetate in ethanol. The complex has been characterized by elemental analysis, FTIR, UV-Vis, and X-ray single crystal diffraction. Two crystallographically different cationic units, A and B, of the title complex are found. Both units are essentially isostructural; nevertheless, small differences exist between them. Both units contain four cobalt atoms arranged at the corners of distorted cubane-like core alternatively with phenoxy oxygen of the Schiff base. In both cases, one cobalt binds to three coordinated sites from the corresponding tridentate Schiff base ligand, and the fourth one was bonded by the acetate oxygen, and the fifth and the sixth donor sites come from the phenolate oxygen of another Schiff base ligand.

Mono- and dioxido-vanadium(V) complexes of a tridentate ONO Schiff base ligand: Synthesis, spectral characterization, X-ray crystal structure, and anticancer activity

Polyhedron ◽  
2015 ◽  
Vol 93 ◽  
pp. 99-105 ◽  
Author(s):  
S. Yousef Ebrahimipour ◽  
Iran Sheikhshoaie ◽  
Anna Christin Kautz ◽  
Mojgan Ameri ◽  
Hamzeh Pasban-Aliabadi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Anticancer Activity ◽  
Schiff Base Ligand ◽  
Spectral Characterization ◽  
X Ray ◽  
Ligand Synthesis

Synthesis, properties and X-ray crystal structure of schiff base organoimido complexes of rhenium(V)

1984 ◽  
Vol 90 (2) ◽  
pp. 121-131 ◽  
Author(s):  
R. Rossi ◽  
A. Marchi ◽  
A. Duatti ◽  
L. Magon ◽  
U. Casellato ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
X Ray ◽  
Synthesis Properties

Structure and aggregation properties of a Schiff-base zinc(ii) complex derived from cis-1,2-diaminocyclohexane

2015 ◽  
Vol 44 (29) ◽  
pp. 13040-13048 ◽  
Author(s):  
Giuseppe Consiglio ◽  
Ivan Pietro Oliveri ◽  
Francesco Punzo ◽  
Amber L. Thompson ◽  
Santo Di Bella ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Schiff Base Complex ◽  
Base Complex ◽  
X Ray ◽  
Asymmetric Dimer

The effect of the bridging diamine upon the aggregation properties of a ZnII Schiff-base complex is reported. The X-ray crystal structure indicates the presence of an asymmetric dimer which is preserved even in solution.

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