Visual pathway - Phototransduction - Visual Pigments

3 important questions on Visual pathway - Phototransduction - Visual Pigments

Name the 2 visual pigments families found in the eye?

  1. Rhodopsin
  2. Iodopsin

What are 2 similar feature of visual pigments?

Contain opsin protein + retinal vitamin

List the 4 step pathway involved in the formation and breakdown of rhodopsin

  1. Pigment synthesis: vitamin a is oxidised to become 11-cis-retinal → bonded with opsin → form rhodopsin
  1. Pigment bleaching: Light absorption by rhodopsin → rapid series of steps in which retinal changes shape (becomes 11-cis to all trans) released from opsin
  2. Pigment regeneration: with ATP enzymes convert all-trans-retinal back to 11-cis-retinal at the pigmented layer

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