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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Tissue distribution of L-fucokinase in rodents.

L-fucose (fucose) is a monosaccharide normally present in mammals and is unique in being the only levorotatory sugar that can be synthesized and utilized by mammals. The metabolism of fucose is incompletely understood, but fucose can be synthesized de novo or salvaged. The utilization of fucose in the salvage pathway begins with phosphorylation by fucokinase. As part of an investigation of fucose metabolism in normal and disease states, we began an investigation of this enzyme. In this report, we present the tissue distribution of the enzyme in rat and mouse. The highest amount of activity was present in brain of both species. Some activity was found in all tissues examined (liver, kidney, heart, lung, spleen, brain, muscle, thymus, white adipose, testes, eye, aorta, small intestine, and submaxillary gland). Very low levels were found in small intestine. Varying levels in the tissues seems most likely to be the result of varying amounts of fucokinase protein as no difference in the Km values of crude enzyme could be shown. Protein-bound fucose levels were determined using the L-cysteine-phenol-sulfuric acid (CPS) assay. There is not a good correlation between fucokinase activity and protein-bound fucose, suggesting some tissues are more active in synthesis of fucose than others.[1]


  1. Tissue distribution of L-fucokinase in rodents. Miller, E.N., Rupp, A.L., Lindberg, M.K., Wiese, T.J. Comp. Biochem. Physiol. B, Biochem. Mol. Biol. (2005) [Pubmed]
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