トラマメ(Phaseolus vulgaris L.)発芽子葉α-アミラーゼcDNAのクローニング

  • 森 春英
    Department of Applied Bioscience, Faculty of Agriculture , Hokkaido University
  • 小林 哲也
    Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University
  • 殿川 隆志
    Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University
  • 立松 あゆみ
    Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University
  • 松井 博和
    Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University
  • 木村 淳夫
    Department of Applied Bioscience, Faculty of Agriculture , Hokkaido University
  • 千葉 誠哉
    Department of Applied Bioscience, Faculty of Agriculture , Hokkaido University

書誌事項

タイトル別名
  • Molecular Cloning of an a-Amylase cDNA from Germinating Cotyledons of Kidney Bean(Phaseolus vulgaris L. cv. Toramame)
  • トラマメ(Phaseolus vulgaris L.)発芽子探 a一アミラーゼcDNAのクローニング
  • Molecular Cloning of an アルファーAmylase cD

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説明

A cDNA coding a-amylase of Phaseolus vulgaris L. cv. Toramame was isolated and sequenced. PCR primers were synthesized based on the partial amino acid sequences of the purified a-amylase. The DNA fragment amplified by PCR with the primers was applied as a probe to screen the cDNA library representing mRNA in the cotyledons of germinating seeds. The cDNA sequence in the positive clone encoded a unique 1263-nucleotide open reading frame flanked by 5'- and 3'-untranslated regions of 6 and 194 nucleotides, respectively. The open reading frame encoded a protein of 420 amino acid residues including a 23 amino-acid-long signal peptide. The kidney bean a-amylase shows over 70% similarity in the amino acid sequence with other dicotyledonous plant a-amylases. Especially, 94% of the residues are identical to a-amylase from Vigna radiate. Kidney bean a-amylase also has all four sequence regions highly conserved in enzymes belonging to the amylase family.

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