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Horm Metab Res 2006; 38(4): 269-278
DOI: 10.1055/s-2006-925349
Review
© Georg Thieme Verlag KG Stuttgart · New York

The Retinol-binding Protein System: A Potential Paradigm for Steroid-binding Globulins?

C.  Redondo1 , B.  J.  Burke1 , J.  B. C.  Findlay1
  • 1 Department of Biochemistry and Microbiology, University of Leeds, United Kingdom
Further Information

Publication History

Received 23 September 2005

Accepted after revision 10 November 2005

Publication Date:
15 May 2006 (online)

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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

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