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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Biophys+Rev 2018 ; 10 (2): 235-9 Nephropedia Template TP
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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): 235-9 PMID29168118show 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.