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Retinylidene protein

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What is VISUAL PHOTOTRANSDUCTION? What does VISUAL PHOTOTRANSDUCTION mean?

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How to say "retinylidene"! (High Quality Voices)

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How to Pronounce Retinylidene

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How to Pronounce Channelrhodopsin

Retinylidene protein, is a family of proteins that use retinal as a chromophore for light reception. It is the molecular basis for a variety of light-sensing systems from phototaxis in flagellates to eyesight in animals. Retinylidene proteins include all forms of opsin and rhodopsin. While rhodopsin in the narrow sense refers to a dim-light visual pigment found in vertebrates, usually on rod cells, rhodopsin in the broad sense refers any molecule consisting of an opsin and a retinal chromophore in the ground state. When activated by light, the chromophore is isomerized, at which point the molecule as a whole is no longer rhodopsin, but a related molecule such as metarhodopsin. However, it remains a retinylidene protein. The chromophore then separates from the opsin, at which point the bare opsin is a retinylidene protein. Thus, the molecule remains a retinylidene protein throughout the phototransduction cycle.
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    • Structure 

    • Mechanism of light reception 

    • Types of rhodopsins