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J Biol Chem, Vol. 273, Issue 14, 8193-8202, April 3, 1998
From Small Molecule Drug Discovery, We have cloned the cDNA encoding human
GDP-mannose 4,6-dehydratase, the first enzyme in the pathway converting
GDP-mannose to GDP-fucose. The message is expressed in all tissues and
cell lines examined, and the cDNA complements Lec13, a Chinese
Hamster Ovary cell line deficient in GDP-mannose 4,6-dehydratase
activity. The human GDP-mannose 4,6-dehydratase polypeptide shares 61%
identity with the enzyme from Escherichia coli, suggesting
broad evolutionary conservation. Purified recombinant enzyme utilizes
NADP+ as a cofactor and, like its E. coli
counterpart, is inhibited by GDP-fucose, suggesting that this aspect of
regulation is also conserved. We have isolated the product of the
dehydratase reaction, GDP-4-keto-6-deoxymannose, and confirmed its
structure by electrospray ionization-mass spectrometry and high field
NMR. Using purified recombinant human GDP-mannose 4,6-dehydratase and
FX protein (GDP-keto-6-deoxymannose 3,5-epimerase, 4-reductase), we
show that the two proteins alone are sufficient to convert GDP-mannose
to GDP-fucose in vitro. This unequivocally demonstrates
that the epimerase and reductase activities are on a single
polypeptide. Finally, we show that the two homologous enzymes from
E. coli are sufficient to carry out the same enzymatic
pathway in bacteria.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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