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  • Title: Interaction of ONION2 ketoacyl CoA synthase with ketoacyl CoA reductase of rice.
    Author: Kogure K, Watanabe A, Ito Y.
    Journal: Mol Biol Rep; 2022 Feb; 49(2):1643-1647. PubMed ID: 35028856.
    Abstract:
    BACKGROUND: Fatty acid elongases (FAEs), which catalyse elongation reactions of a carbon chain of very-long-chain fatty acids, play an important role in shoot development in rice. The elongation reactions consist of four sequential reactions catalysed by distinct enzymes, which are assumed to form an elongation complex. However, no interacting proteins of ONION1 (ONI1) and ONI2, which are ketoacyl CoA synthase catalyzing the first step and are required for shoot development in rice, are reported. METHODS AND RESULTS: In this study ketoacyl CoA reductase (KCR) that interacts with ONI1 and ONI2 was searched. A database search identified 10 KCR genes in the rice genome. Among the genes, the expression pattern of KCR1 was similar to that of ONI2. Yeast two-hybrid analysis showed interaction of ONI2 with KCR1, which was confirmed by GST pull-down assay. No interacting partner of ONI1 was identified. CONCLUSIONS: Our results suggest that ONI2 and KCR1 form an FAE complex that may play a role in biosynthesizing VLCFAs during shoot development.
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