Abstract
Retinol (vitamin A) is an example of a small molecule that is essential for higher
organisms; its utilisation has been involved in the evolution of a number of proteins.
In mammalian species, retinol is obtained from the diet and controls the release of
its binding protein from hepatocytes into the blood stream. Subsequent influx into
cells under normal situations usually involves a specific membrane-bound receptor
for retinol-binding protein, which facilitates the uptake of retinol alone or bound
to its carrier. This specific receptor has not yet been identified, but a receptor
for a related lipocalin has been cloned. It represents a relatively new family, and
there are a number of related genes in various eukaryotic genomes, suggesting that
the system is very widespread in multicellular organisms. Its significance has been
highlighted recently by the suggestion that retinol-binding protein, through its receptor,
may play a major role in type 2 diabetes, perhaps the greatest scourge of modern society.
This system may provide a new paradigm in mammalian biology, another example of which
may exist in the processes responsible for steroid handling. This review outlines
the characteristics of retinol utilisation in mammalian species, focusing primarily
on the uptake system.
Key words
Lipocalin - receptor - transport - vitamin A - conformations
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J. B. C. Findlay
Department of Biochemistry and Microbiology
University of Leeds · Mount Preston Road · LS2 9JT Leeds · United Kingdom
Fax: +44 (113) 343-3167
eMail: j.b.c.findlay@leeds.ac.uk