Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29168118
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biophys+Rev
2018 ; 10
(2
): 235-239
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Ion-protein interactions of a potassium ion channel studied by attenuated total
reflection Fourier transform infrared spectroscopy
#MMPMID29168118
Furutani Y
Biophys Rev
2018[Apr]; 10
(2
): 235-239
PMID29168118
show ga
An understanding of ion-protein interactions is key to a better understanding of
the molecular mechanisms of proteins, such as enzymes, ion channels, and ion
pumps. A potassium ion channel, KcsA, has been extensively studied in terms of
ion selectivity. Alkali metal cations in the selectivity filter were visualized
by X-ray crystallography. Infrared spectroscopy has an intrinsically higher
structural sensitivity due to frequency changes in molecular vibrations
interacting with different ions. In this review article, I attempt to summarize
ion-exchange-induced differences in Fourier transform infrared spectroscopy, as
applied to KcsA, to explain how this method can be utilized to study ion-protein
interactions in the KcsA selectivity filter. A band at 1680 cm(-1) in the amide I
region would be a marker band for the ion occupancy of K(+), Rb(+), and Cs(+) in
the filter. The band at 1627 cm(-1) observed in both Na(+) and Li(+) conditions
suggests that the selectivity filter similarly interacts with these ions. In
addition to the structural information, the results show that the titration of
K(+) ions provides quantitative information on the ion affinity of the
selectivity filter.