title: Arabidopsis 3-deoxy-D-manno-oct-2-ulosonate-8-phosphate synthase: cDNA cloning and expression analyses.
abstract: The molecular characterization of two isoforms of 3-deoxy-d-manno-oct-2-ulosonate (KDO) -8-phosphate synthase (AtkdsA1 and AtkdsA2) from Arabidopsis is reported here. First, by isolating a full-length cDNA for AtkdsA1, it was confirmed that the deduced primary structures of AtkdsA1 and AtkdsA2 proteins were 93% identical. Functional expression and purification studies demonstrated the efficient catalytic activity of the AtkdsA1 enzyme to produce KDO-8-phosphate from phosphoenolpyruvate and d-arabinose-5-phosphate. RT-PCR and RNA-gel blot analysis revealed different expression profiles for both genes; the AtkdsA1 gene was predominantly expressed in the shoots, while the AtkdsA2 transcript accumulated to a higher level in the roots, implicating differential roles of these isoforms in planta.
authors.affiliation: Laboratory of Plant Nutrition, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Matsuura
authors.forename: Isao
authors.initials: I
authors.lastname: Miyagawa
authors.forename: Masaru
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Daisaku
authors.initials: D
authors.lastname: Ohta
authors.forename: Toru
authors.initials: T
authors.lastname: Matoh
mesh_terms: D000446:Aldehyde-Lyases / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA
chemical_list: D029681:Arabidopsis Proteins; D018076:DNA, Complementary; D007527:Isoenzymes; C020011:2-dehydro-3-deoxyphosphooctonate aldolase; D000446:Aldehyde-Lyases