Functional analyses of carnivorous plant-specific amino acid residues in S-like ribonucleases

Naoki Arai, Emi Nishimura, Yo Kikuchi, Takashi Ohyama

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    Unlike plants with no carnivory, carnivorous plants seem to use S-like ribonucleases (RNases) as an enzyme for carnivory. Carnivorous plant-specific conserved amino acid residues are present at four positions around the conserved active site (CAS). The roles of these conserved amino acid residues in the enzymatic function were explored in the current study by preparing five recombinant variants of DA-I, the S-like RNase of Drosera adelae. The k<inf>cat</inf> and k<inf>cat</inf>/K<inf>m</inf> values of the enzymes revealed that among the four variants with a single mutation, the serine to glycine mutation at position 111 most negatively influenced the enzymatic activity. The change in the bulkiness of the amino acid residue side-chain seemed to be the major cause of the above effect. Modeling of the three dimensional (3D) structures strongly suggested that the S to G mutation at 111 greatly altered the overall enzyme conformation. The conserved four amino acid residues are likely to function in keeping the two histidine residues, which are essential for the cleavage of RNA strands, and the CAS in the most functional enzymatic conformation.

    元の言語English
    記事番号34351
    ページ(範囲)108-112
    ページ数5
    ジャーナルBiochemical and Biophysical Research Communications
    465
    発行部数1
    DOI
    出版物ステータスPublished - 2015 7 30

    ASJC Scopus subject areas

    • Biochemistry
    • Biophysics
    • Cell Biology
    • Molecular Biology

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