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  • Title: Identification and characterization of a UDP-D-glucuronate 4-epimerase in Arabidopsis.
    Author: Usadel B, Schlüter U, Mølhøj M, Gipmans M, Verma R, Kossmann J, Reiter WD, Pauly M.
    Journal: FEBS Lett; 2004 Jul 02; 569(1-3):327-31. PubMed ID: 15225656.
    Abstract:
    One of the major sugars present in the plant cell wall is d-galacturonate, the dominant monosaccharide in pectic polysaccharides. Previous work indicated that one of the activated precursors necessary for the synthesis of pectins is UDP-d-galacturonate, which is synthesized from UDP-d-glucuronate by a UDP-d-glucuronate 4-epimerase (GAE). Here, we report the identification, cloning and characterization of a GAE6 from Arabidopsis thaliana. Functional analysis revealed that this enzyme converts UDP-d-glucuronate to UDP-d-galacturonate in vitro. An expression analysis of this epimerase and its five homologs in the Arabidopsis genome by quantitative RT-PCR and promoter::GUS fusions indicated differential expression of the family members in plant tissues and expression of all isoforms in the developing pollen of A. thaliana.
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