β-Cyanoalanine synthase and cysteine synthase from potato: Molecular cloning, biochemical characterization, and spatial and hormonal regulation

Akiko Maruyama, Kazuki Saito, Kimiharu Ishizawa

研究成果: Contribution to journalArticle査読

57 被引用数 (Scopus)

抄録

β-Cyanoalanine synthase (CAS, L-3-cyanoalanine synthase; EC 4.4.1.9) is the most important enzyme in cyanide metabolism. In addition to CAS, cysteine synthase (CS, EC 4.2.99.8) possesses CAS activity. To explore the physiological significance of cyanide metabolism, we isolated the cDNA clones corresponding to purified CAS (designated PCAS-1 and PCAS-2) and CS (designated PCS-1 and PCS-2) from potato using the information of these amino acid sequences. The recombinant proteins of PCS-1, PCS-2 and PCAS-1 catalyzed both CAS and CS reactions, although the ratios between CAS and CS activity were remarkably different. PCAS-1 preferred the substrates for the CAS reaction to the substrates for the CS reaction. From the kinetic characters and homology of amino acid sequences with known CS-like proteins, PCS-1, PCS-2 and PCAS-1 were identified as cytosolic CS, plastidic CS and mitochondrial CAS, respectively. The highest level of CAS activity, CAS protein and its mRNA were detected in potato buds. Stimulation of CAS activity and protein accumulation by ethylene without the concomitant increase of its mRNA suggested that ethylene induces CAS protein accumulation at the post-transcriptional level.

本文言語英語
ページ(範囲)749-760
ページ数12
ジャーナルPlant Molecular Biology
46
6
DOI
出版ステータス出版済み - 2001
外部発表はい

All Science Journal Classification (ASJC) codes

  • 農業および作物学
  • 遺伝学
  • 植物科学

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