Persistent activation of transducin by bleached rhodopsin in salamander rods.
Open Access
- 1 December 1996
- journal article
- Published by Rockefeller University Press in The Journal of general physiology
- Vol. 108 (6) , 557-563
- https://doi.org/10.1085/jgp.108.6.557
Abstract
The porphyropsin-vitamin A2 cycle has been found heretofore only in the retinas of bony fishes capable of existence in fresh water. Cyclostomes, due to their primitive and isolated phylogenetic position, might be expected to possess the rhodopsin-vitamin A1 cycle common to marine elasmobranchs, almost all marine teleosts, and all terrestrial vertebrates so far examined. Yet the anadromous sea lamprey, Petromyzon marinus, possesses primarily the porphyropsin system, like an anadromous teleost. This observation greatly extends the phylogenetic association of vitamin A2 with the capacity for freshwater existence.Keywords
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