scholarly journals Light-induced difference FTIR spectroscopy of primate blue-sensitive visual pigment at 163 K

2021 ◽  
Author(s):  
Shunpei Hanai ◽  
Kota Katayama ◽  
Hiroo Imai ◽  
Hideki Kandori
Keyword(s):  
Ftir Spectroscopy ◽  
Visual Pigment

“In situ” observation of the role of chloride ion binding to monkey green sensitive visual pigment by ATR-FTIR spectroscopy

2018 ◽  
Vol 20 (5) ◽  
pp. 3381-3387 ◽  
Author(s):  
Kota Katayama ◽  
Yuji Furutani ◽  
Masayo Iwaki ◽  
Tetsuya Fukuda ◽  
Hiroo Imai ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Ftir Spectroscopy ◽  
Visual Pigment ◽  
Chloride Ion ◽  
Ion Binding ◽  
In Situ Observation ◽  
The Novel ◽  
Long Wavelength

ATR-FTIR spectroscopic study elucidates the novel role of Cl−-binding in primate long-wavelength-sensitive (LWS) visual pigment.

scholarly journals Spectral Tuning Mechanism of Primate Blue-sensitive Visual Pigment Elucidated by FTIR Spectroscopy

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Kota Katayama ◽  
Yuki Nonaka ◽  
Kei Tsutsui ◽  
Hiroo Imai ◽  
Hideki Kandori
Keyword(s):  
Ftir Spectroscopy ◽  
Visual Pigment ◽  
Spectral Tuning ◽  
Tuning Mechanism

scholarly journals Unique retinal binding pocket of primate blue-sensitive visual pigment

2020 ◽  
Author(s):  
Yuki Nonaka ◽  
Shunpei Hanai ◽  
Kota Katayama ◽  
Hiroo Imai ◽  
Hideki Kandori
Keyword(s):  
Ftir Spectroscopy ◽  
Low Temperatures ◽  
Visual Pigment ◽  
Binding Pocket ◽  
Visual Pigments ◽  
Unique Property ◽  
Light Perception ◽  
Physiological Temperature ◽  
Retinal Binding Pocket ◽  
Isomeric States

ABSTRACTThe visual pigments of humans contain 11-cis retinal as the chromophore of light perception, and its photoisomerization to the all-trans form initiates visual excitation in our eyes. It is well known that three isomeric states of retinal (11-cis, all-trans, and 9-cis) are in photoequilibrium at very low temperatures such as 77 K. Here we report the lack of formation of the 9-cis form in monkey blue (MB) at 77 K, as revealed by light-induced difference FTIR spectroscopy. This indicates that the chromophore binding pocket of MB does not accommodate the 9-cis form, even though it accommodates the all-trans form by twisting the chromophore. Mutation of the blue-specific tyrosine at position 265 into tryptophan, which is highly conserved in other animal rhodopsins, led to formation of the 9-cis form in MB, suggesting that Y265 is one of the determinants of the unique photochemistry in blue pigments. We also found that 9-cis retinal does not bind to MB opsin, implying that the chromophore binding pocket does not accommodate the 9-cis form at physiological temperature. The unique property of MB is discussed based on the present results.

High resolution FTIR spectroscopy using a slit jet: sampling the overtone spectrum of 12C2H4

1997 ◽  
Vol 90 (3) ◽  
pp. 381-387 ◽  
Author(s):  
R. GEORGES ◽  
M. BACH ◽  
M. HERMAN
Keyword(s):  
High Resolution ◽  
Ftir Spectroscopy

Conductivity Studies of Schiff Base Ligands Derived from O-Phenylenediamine and Their Co(II) and Zn(II) Complexes

2015 ◽  
Vol 12 (2) ◽  
pp. 13
Author(s):  
Muhamad Faridz Osman ◽  
Karimah Kassim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Schiff Base ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Impedance Spectroscopy ◽  
Ftir Spectroscopy ◽  
Coordination Complexes ◽  
Frequency Range ◽  
Schiff Base Ligands

The coordination complexes of Co(II) and Zn(II) with Schiff bases derived from o-phenylenediamine and substituted 2-hydroxybenzaldehyde were prepared All compounds were characterized by Fourier transform infrared (FTIR) spectroscopy and Nuclear magnetic resonance (NMR) spectroscopy elemental analyzers. They were analyzed using impedance spectroscopy in the frequency range of 100Hz-1 MHz. LI and L2 showed higher conductivity compared to their metal complexes, which had values of 1.3 7 x 10-7 and 6.13 x 10-8 S/cm respectively. 

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