Cone visual pigments

- 1 - Cone Visual Pigments

Primary structures of chicken cone visual pigments: vertebrate rhodopsins have evolved out of cone visual pigments.

The chicken retina contains rhodopsin (a rod visual pigment) and four kinds of cone visual pigments. The primary structures of chicken red (iodopsin) and rhodopsin have been determined previously. Here we report isolation of three cDNA clones encoding additional pigments from a chicken retinal cDNA library. Based on the partial amino acid sequences of the purified chicken visual pigments togeth...

Cone visual pigments are present in gecko rod cells.

The Tokay gecko (Gekko gekko), a nocturnal lizard, has two kinds of visual pigments, P467 and P521. In spite of the pure-rod morphology of the photoreceptor cells, the biochemical properties of P521 and P467 resemble those of iodopsin (the chicken red-sensitive cone visual pigment) and rhodopsin, respectively. We have found that the amino acid sequence of P521 deduced from the cDNA was very sim...

The kinetics of cone visual pigments in man.

Rushton’s general kinetic equation for human u~ne pigments is teeted by estimatingthe photolysis rate at equilibrium from the initial photolysb rate and compviao it to theequilibrium rate of regeneration measumd imn~&tely; after the bku&ing; light is tutnsd off.Thirty-seven experiments cart&i; out at a variety of intermcdiata Yachts an&m; the validityof this equation. The hypothesis...

Rod and cone visual pigments in the goldfish.

This microspectrophotometric (MSP) study has confirmed that goldfish, acclimated under a certain light and temperature regimen, possess mixtures of porphyropsin and rhodopsin in their rod outer segments. Moreover, the MSP spectra from the red, green and blue cones of these acclimated goldfish also shifted to shorter wavelengths from spectra of pure 3-dehydroretinal based visual pigments. Thus, ...