NDLI: ι-Crystallin and vitamin A2 isomers in lenses of diurnal geckos

Content Provider	Springer Nature Link
Author	Röll, B. Schwemer, J.
Copyright Year	1999
Abstract	The ocular lenses of several genera of strictly diurnal dwarf geckos contain the monomeric ι-crystallin, which is closely related to the cellular retinol-binding protein type I (CRBP I). The contents of ι-crystallin vary between 2 and 12% of the total amount of crystallins depending on species. The endogenous ligand of ι-crystallin of all species investigated so far turns out to be 3,4-didehydroretinol (vitamin A2). No other lenticular retinoids were detected. In lenses of Old World species (Lygodactylus, Pristurus, Quedenfeldtia), this ligand occurs exclusively in the all-trans form. In lenses of species of the neotropical genus Gonatodes, however, it occurs in two isomeric forms: all-trans and 11-cis. ι-Crystallin of Gonatodes is the first CRBP-like protein which naturally binds an 11-cis isomer of vitamin A. All-trans 3,4-didehydroretinol and its ester are present in eye cups of Lygodactylus. In contrast, eye cups of nocturnal geckos without ι-crystallin lack these retinoids. The retinal pigment epithelium is suggested to be the site of conversion of retinol to 3,4-didehydroretinol, which finally serves as ligand of ι-crystallin.
Starting Page	51
Ending Page	58
Page Count	8
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	185
Issue Number	1
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-08-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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