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- W2087866237 abstract "GDP-L-fucose is the activated nucleotide sugar form of L-fucose, which is a constituent of many structural polysaccharides and glycoproteins in various organisms. The de novo synthesis of GDP-L-fucose from GDP-D-mannose encompasses three catalytic steps, a 4,6-dehydration, a 3,5-epimerization, and a 4-reduction. The mur1 mutant of Arabidopsis is deficient in L-fucose in the shoot and is rescued by growth in the presence of exogenously supplied L-fucose. Biochemical assays of the de novo pathway for the synthesis of GDP-L-fucose indicated that mur1 was blocked in the first nucleotide sugar interconversion step, a GDP-D-mannose-4,6-dehydratase. An expressed sequence tag was identified that showed significant sequence similarity to proposed bacterial GDP-D-mannose-4,6-dehydratases and was tightly linked to the mur1 locus. A full-length clone was isolated from a cDNA library, and its coding region was expressed in Escherichia coli. The recombinant protein exhibited GDP-D-mannose-4,6-dehydratase activity in vitro and was able to complement mur1 extracts in vitro to complete the pathway for the synthesis of GDP-L-fucose. All seven mur1 alleles investigated showed single point mutations in the coding region for the 4,6-dehydratase, confirming that it represents the MUR1 gene." @default.
- W2087866237 created "2016-06-24" @default.
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- W2087866237 date "1997-03-04" @default.
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- W2087866237 title "The <i>MUR1</i> gene of <i>Arabidopsis thaliana</i> encodes an isoform of GDP- <scp>d</scp> -mannose-4,6-dehydratase, catalyzing the first step in the <i>de novo</i> synthesis of GDP- <scp>l</scp> -fucose" @default.
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- W2087866237 doi "https://doi.org/10.1073/pnas.94.5.2085" @default.
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