Glycobiology, 2000, Vol. 10, No. 10 951-958
© 2000 Oxford University Press
MINI REVIEW Keratan sulfate: structure, biosynthesis, and function
Department of Ophthalmology, University of Pittsburgh, 203 Lothrop Street, Pittsburgh, PA 15213, USA
The last 5 years have seen a marked increase in research on keratan sulfate (KS) and a concomitant increase in our understanding of the range of molecules that carry this adaptable polysaccharide. More than 15 KS-linked proteins have been identified and many of the genes encoding these have been cloned. KS-containing molecules have been identified in numerous epithelial and neural tissues in which KS expression responds to embryonic development, physiological variations, and to wound healing. A corneal cell culture system has been developed in which long-term KS biosynthesis is maintained. Progress has been made toward identification of the glycosyl- and sulfotransferases responsible for KS biosynthesis. A mouse knockout of a corneal KS-proteoglycan has provided the first experimental support for the role of KS in corneal transparency. Evidence has also been presented supporting functional roles of KS in cellular recognition of protein ligands, axonal guidance, cell motility, and in embryo implantation. These findings have served to expand the concept of what keratan sulfate is and the potential roles it may play in the cellular biology of diverse tissues.
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