Cis-Trans Isomerization of Retinal

11-cis-Retinal → all-trans-Retinal

Aperçu

When a photon strikes rhodopsin in rod cells of the retina, it causes the 11-cis-retinal chromophore to isomerize to the all-trans configuration in about 200 femtoseconds. This is one of the fastest known chemical reactions and the fundamental first step in vision. The conformational change triggers a G-protein signaling cascade.

Exemple du quotidien

Every time you see anything, this photochemical reaction is occurring millions of times per second in the rod and cone cells of your eyes.

Importance industrielle

Understanding retinal photochemistry guides the development of artificial retinas, optogenetics tools, and light-sensitive biomaterials.

Propriétés

Type: Photochemical
Réversible: Non
Énergie: Endothermique
Catalyseur: Rhodopsin protein

Réactions associées

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Frequently Asked Questions

What is the equation for Cis-Trans Isomerization of Retinal?

The balanced equation is: 11-cis-Retinal → all-trans-Retinal.

What type of reaction is Cis-Trans Isomerization of Retinal?

Cis-Trans Isomerization of Retinal is a photochemical reaction.

Is Cis-Trans Isomerization of Retinal exothermic or endothermic?

Cis-Trans Isomerization of Retinal is endothermic (absorbs energy).

What conditions are needed for Cis-Trans Isomerization of Retinal?

This reaction requires a catalyst (Rhodopsin protein).