Cloning, functional expression, and characterization of the raffinose oligosaccharide chain elongation enzyme, galactan:galactan galactosyltransferase, from common bugle leaves.

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  • Author(s): Tapernoux-Lüthi EM;Tapernoux-Lüthi EM; Böhm A; Keller F
  • Source:
    Plant physiology [Plant Physiol] 2004 Apr; Vol. 134 (4), pp. 1377-87. Date of Electronic Publication: 2004 Mar 19.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: American Society of Plant Biologists Country of Publication: United States NLM ID: 0401224 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0032-0889 (Print) Linking ISSN: 00320889 NLM ISO Abbreviation: Plant Physiol Subsets: MEDLINE
    • Publication Information:
      Publication: : [Rockville, MD] : American Society of Plant Biologists
      Original Publication: Lancaster, Pa., American Society of Plant Physiologists.
    • Subject Terms:
      Ajuga/*enzymology ; Galactosyltransferases/*genetics ; Plant Leaves/*enzymology ; Raffinose/*metabolism; Ajuga/chemistry ; Ajuga/genetics ; Amino Acid Sequence ; Cloning, Molecular ; Cold Temperature ; DNA, Complementary/chemistry ; DNA, Complementary/genetics ; Galactosyltransferases/metabolism ; Gene Expression Regulation, Enzymologic ; Gene Expression Regulation, Plant ; Molecular Sequence Data ; Phylogeny ; Plant Leaves/chemistry ; Plant Leaves/genetics ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Sequence Analysis, DNA ; Sequence Homology, Amino Acid ; Nicotiana/enzymology ; Nicotiana/genetics
    • Abstract:
      Galactan:galactan galactosyltransferase (GGT) is a unique enzyme of the raffinose family oligosaccharide (RFO) biosynthetic pathway. It catalyzes the chain elongation of RFOs without using galactinol (alpha-galactosyl-myoinositol) by simply transferring a terminal alpha-galactosyl residue from one RFO molecule to another one. Here, we report the cloning and functional expression of a cDNA encoding GGT from leaves of the common bugle (Ajuga reptans), a winter-hardy long-chain RFO-storing Lamiaceae. The cDNA comprises an open reading frame of 1215 bp. Expression in tobacco (Nicotiana plumbaginifolia) protoplasts resulted in a functional recombinant protein, which showed GGT activity like the previously described purified, native GGT enzyme. At the amino acid level, GGT shows high homologies (>60%) to acid plant alpha-galactosidases of the family 27 of glycosylhydrolases. It is clearly distinct from the family 36 of glycosylhydrolases, which harbor galactinol-dependent raffinose and stachyose synthases as well as alkaline alpha-galactosidases. Physiological studies on the role of GGT confirmed that GGT plays a key role in RFO chain elongation and carbon storage. When excised leaves were exposed to chilling temperatures, levels of GGT transcripts, enzyme activities, and long-chain RFO concentrations increased concomitantly. On a whole-plant level, chilling temperatures induced GGT expression mainly in the roots and fully developed leaves, both known RFO storage organs of the common bugle, indicating an adaptation of the metabolism from active growth to transient storage in the cold.
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    • Molecular Sequence:
      GENBANK AY386246
    • Accession Number:
      0 (DNA, Complementary)
      0 (Plant Proteins)
      EC 2.4.1.- (Galactosyltransferases)
      EC 2.4.1.- (galactan-galactan galactosyltransferase, Ajuga reptans)
      N5O3QU595M (Raffinose)
    • Publication Date:
      Date Created: 20040323 Date Completed: 20040819 Latest Revision: 20240411
    • Publication Date:
      20240411
    • Accession Number:
      PMC419815
    • Accession Number:
      10.1104/pp.103.036210
    • Accession Number:
      15034167