Retinal tubulin binds macular carotenoids

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Publication Type Journal Article
School or College School of Medicine
Department Ophthalmology
Creator Bernstein, Paul S.
Other Author Balashov, N A; Tsong, E D; Rando, R R
Title Retinal tubulin binds macular carotenoids
Date 1997
Description PURPOSE: To investigate the biochemical mechanisms responsible for the specific uptake, concentration, and stabilization of the carotenoids lutein and zeaxanthin in the macula. METHODS: Soluble extracts of bovine retina mixed with radioactive carotenoids were purified by hydrophobic interaction, ion exchange, and gel filtration chromatography. Carotenoid-associated proteins in these purified preparations were identified through photoaffinity labeling and protein microsequencing. Similar purifications on human macular tissue without the addition of exogenous carotenoids also were performed. RESULTS: Experiments on bovine retinal tissue demonstrated that tubulin is the major soluble carotenoid-binding protein. When soluble extracts of human macular protein were examined, the endogenous carotenoids lutein and zeaxanthin were found to copurify with tubulin. CONCLUSIONS: Tubulin is found in abundance in the receptor axon layer of the fovea, where it can serve as a locus for the deposition of the high concentrations of macular carotenoids found there. The binding interaction of carotenoids and tubulin in the Henle's fiber layer could play an important role in the photoprotective effects of the macular carotenoids against the progression of age-related macular degeneration. The association of carotenoids with tubulin, a protein that can form highly ordered linear arrays, may provide an explanation for the dichroic phenomenon of Haidinger's brushes.
Type Text
Publisher Association for Research in Vision and Ophthalmology
Volume 38
Issue 1
First Page 167
Last Page 175
Subject Chromatography, Gel; Electrophoresis; Xanthophylls
Subject MESH beta Carotene
Language eng
Bibliographic Citation Bernstein PS, Balashov NA, Tsong ED, Rando RR. (1997). Retinal tubulin binds macular carotenoids. Invest Ophthalmol Vis Sci, 38(1), 167-75
Rights Management (c) Association for Research in Vision and Ophthalmology
Format Medium application/pdf
Identifier ir-main,1752
ARK ark:/87278/s6r21jts
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 705602
Reference URL
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