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Cloning and expression of goldfish opsin sequences
R L Johnson1, K B Grant, T C Zankel
1Department of Chemistry, Columbia University, New York, New York 10027.
Biochemistry
|January 12, 1993
Summary
Researchers identified five opsin cDNA clones from goldfish retinas, characterizing their spectral properties. This study advances understanding of goldfish visual pigments, including rod, red cone, and novel green and blue pigments.
Area of Science:
- Molecular Biology
- Vision Science
- Genetics
Background:
- Opsins are crucial proteins in visual pigments, mediating light detection.
- Goldfish possess a diverse visual system with multiple cone types and rod cells.
Purpose of the Study:
- To isolate and characterize novel opsin cDNA clones from goldfish retina.
- To determine the spectral properties of the pigments encoded by these opsin clones.
Main Methods:
- Isolation and sequencing of five opsin cDNA clones from a goldfish retina cDNA library.
- Expression of apoproteins in tissue culture cells and reconstitution with 11-cis-retinal.
- Spectrophotometric analysis to determine the wavelength of maximal absorption (λmax).
Main Results:
- Identified goldfish rod opsin (λmax 492 nm) and red cone opsin (λmax 525 nm).
- Characterized two rhodopsin-like clones encoding pigments with λmax at 505 nm and 511 nm, likely goldfish green pigments.
- Identified a fifth clone as goldfish blue pigment (λmax 441 nm).
Conclusions:
- The study successfully identified and spectrally characterized five distinct opsin clones from goldfish.
- These findings provide insights into the molecular basis of color vision and spectral tuning in goldfish.
- The identified pigments likely correspond to previously described goldfish visual pigments, including rod, red, green, and blue pigments.