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Light-Regulated Transcription of a Mitochondrial-Targeted K+ Channel.

Engel, Anja J. ; Winterstein, Laura-Marie ; Kithil, Marina ; Langhans, Markus ; Moroni, Anna ; Thiel, Gerhard (2020)
Light-Regulated Transcription of a Mitochondrial-Targeted K+ Channel.
In: Cells, 9 (11)
doi: 10.3390/cells9112507
Article, Bibliographie

Abstract

The inner membranes of mitochondria contain several types of K channels, which modulate the membrane potential of the organelle and contribute in this way to cytoprotection and the regulation of cell death. To better study the causal relationship between K channel activity and physiological changes, we developed an optogenetic platform for a light-triggered modulation of K conductance in mitochondria. By using the light-sensitive interaction between cryptochrome 2 and the regulatory protein CIB1, we can trigger the transcription of a small and highly selective K channel, which is in mammalian cells targeted into the inner membrane of mitochondria. After exposing cells to very low intensities (≤0.16 mW/mm) of blue light, the channel protein is detectable as an accumulation of its green fluorescent protein (GFP) tag in the mitochondria less than 1 h after stimulation. This system allows for an in vivo monitoring of crucial physiological parameters of mitochondria, showing that the presence of an active K channel causes a substantial depolarization compatible with the effect of an uncoupler. Elevated K conductance also results in a decrease in the Ca concentration in the mitochondria but has no impact on apoptosis.

Item Type: Article
Erschienen: 2020
Creators: Engel, Anja J. ; Winterstein, Laura-Marie ; Kithil, Marina ; Langhans, Markus ; Moroni, Anna ; Thiel, Gerhard
Type of entry: Bibliographie
Title: Light-Regulated Transcription of a Mitochondrial-Targeted K+ Channel.
Language: English
Date: 19 November 2020
Journal or Publication Title: Cells
Volume of the journal: 9
Issue Number: 11
DOI: 10.3390/cells9112507
URL / URN: https://www.mdpi.com/2073-4409/9/11/2507
Abstract:

The inner membranes of mitochondria contain several types of K channels, which modulate the membrane potential of the organelle and contribute in this way to cytoprotection and the regulation of cell death. To better study the causal relationship between K channel activity and physiological changes, we developed an optogenetic platform for a light-triggered modulation of K conductance in mitochondria. By using the light-sensitive interaction between cryptochrome 2 and the regulatory protein CIB1, we can trigger the transcription of a small and highly selective K channel, which is in mammalian cells targeted into the inner membrane of mitochondria. After exposing cells to very low intensities (≤0.16 mW/mm) of blue light, the channel protein is detectable as an accumulation of its green fluorescent protein (GFP) tag in the mitochondria less than 1 h after stimulation. This system allows for an in vivo monitoring of crucial physiological parameters of mitochondria, showing that the presence of an active K channel causes a substantial depolarization compatible with the effect of an uncoupler. Elevated K conductance also results in a decrease in the Ca concentration in the mitochondria but has no impact on apoptosis.

Identification Number: pmid:33228123
Divisions: 10 Department of Biology
10 Department of Biology > Plant Membrane Biophyscis (20.12.23 renamed in Biology of Algae and Protozoa)
Date Deposited: 30 Nov 2020 12:44
Last Modified: 30 Nov 2020 12:44
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