Scavenging Systems for Reactive Carbonyls in the Cyanobacterium Synechocystis sp. PCC 6803

  • SHIMAKAWA Ginga
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • SUZUKI Mayumi
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • YAMAMOTO Eriko
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • NISHI Akiko
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • SAITO Ryota
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • SAKAMOTO Katsuhiko
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University
  • YAMAMOTO Hiroshi
    Department of Botany, Graduate School of Science, Kyoto University
  • MAKINO Amane
    Department of Agriculture, Graduate School of Agricultural Science, Tohoku University Core Research for Evolutional Science and Technology, Japan Science and Technology Agency
  • MIYAKE Chikahiro
    Department of Biological and Environmental Sciences, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University Core Research for Evolutional Science and Technology, Japan Science and Technology Agency

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タイトル別名
  • Scavenging Systems for Reactive Carbonyls in the Cyanobacterium <i>Synechocystis</i> sp. PCC 6803

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To elucidate the scavenging systems of sugar- and lipid-derived reactive carbonyls (RCs) in the cyanobacterium Synechocystis sp. PCC 6803 (S. 6803), we selected proteins from S. 6803 based on amino-acid (AA) sequence similarities with proteins from Arabidopsis thaliana, and characterized the properties of the GST-fusion proteins expressed. Slr0942 catalyzed the aldo-keto reductase (AKR) reaction scavenging mainly sugar-derived RCs, methylglyoxal (MG). Slr1192 is the medium-chain dehydrogenase/redutase (MDR). It catalyzed the AKR reaction scavenging several lipid-derived RCs, acrolein, propionaldehyde, and crotonaldehyde. Slr0315 is a short-chain dehydrogenase/redutase (SDR), and it catalyzed only the reduction of MG in the AKR reaction. Slr0381 catalyzed the conversion of hemithioacetal to S-lactoylglutahione (SLG) in the glyoxalase (GLX) 1 reaction. Sll1019 catalyzed the conversion of SLG to glutathione and lactate in the GLX2 reaction. GLX1 and GLX2 compose the glyoxalase system, which scavenges MG. These enzymes contribute to scavenging sugar- and lipid-derived RCs as scavenging systems.

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