In vivo expression of a light-activatable potassium channel using unnatural amino acids.

In vivo expression of a light-activatable potassium channel using unnatural amino acids.
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DOI:
10.1016/j.neuron.2013.08.016
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发表时间:
2013-10-16
期刊:
影响因子:
16.2
通讯作者:
Wang L
Wang L
中科院分区:
医学1区
文献类型:
--
作者:
Kang JY;Kawaguchi D;Coin I;Xiang Z;O'Leary DD;Slesinger PA;Wang L

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Optical control of protein function provides excellent spatial-temporal resolution for studying proteins in situ. Although light-sensitive exogenous proteins and ligands have been employed to manipulate neuronal activity, a method for optical control of neuronal proteins using unnatural amino acids (Uaa) in vivo is lacking. Here, we describe the genetic incorporation of a photoreactive Uaa into the pore of an inwardly-rectifying potassium channel Kir2.1. The Uaa occluded the pore, rendering the channel non-conducting, and upon brief light illumination, was released to permit outward K+ current. Expression of this photo-inducible inwardly rectifying potassium (PIRK) channel in rat hippocampal neurons created a light-activatable PIRK switch for suppressing neuronal firing. We also expressed PIRK channels in embryonic mouse neocortex in vivo and demonstrated a light-activated PIRK current in cortical neurons. The principles applied here to a potassium channel could be generally expanded to other proteins expressed in the brain to enable optical regulation.
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