💡🧬 LIGHT-GATED ION CHANNELS — When Light Controls Cellular Activity
What if light could switch a cell’s electrical activity ON and OFF?
That is the remarkable principle behind light-gated ion channels and the foundation of optogenetics.
🔬 How does it work?
1️⃣ Light Activation 💡
Blue light reaches the light-sensitive protein channelrhodopsin embedded in the cell membrane.
2️⃣ Retinal Responds 👁️
Channelrhodopsin contains retinal—not retinol—as its light-sensitive chromophore. Light absorption causes retinal photoisomerization.
3️⃣ Channel Opens 🚪
The structural change in retinal triggers a conformational change in channelrhodopsin, opening its ion-conducting pore.
4️⃣ Ion Flow ⚡
Charged ions such as Na⁺, K⁺, H⁺ and Ca²⁺ can flow through the open channel according to their electrochemical gradients.
5️⃣ Electrical Activity 🧠


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