A common F-box gene regulates the leucine homeostasis of Medicago truncatula and Arabidopsis thaliana.

Anelia Iantcheva, Miroslava Zhiponova, Miglena Revalska, Jefri Heyman, Ivayla Dincheva, Ilian Badjakov, Nathan De Geyter, Irina Boycheva, Sofie Goormachtig, Lieven De Veylder

Protoplasma 2022 Mar

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The F-box domain is a conserved structural protein motif that most frequently interacts with the SKP1 protein, the core of the SCFs (SKP1-CULLIN-F-box protein ligase) E3 ubiquitin protein ligases. As part of the SCF complexes, the various F-box proteins recruit substrates for degradation through ubiquitination. In this study, we functionally characterized an F-box gene (MtF-box) identified earlier in a population of Tnt1 retrotransposon-tagged mutants of Medicago truncatula and its Arabidopsis thaliana homolog (AtF-box) using gain- and loss-of-function plants. We highlighted the importance of MtF-box in leaf development of M. truncatula. Protein-protein interaction analyses revealed the 2-isopropylmalate synthase (IPMS) protein as a common interactor partner of MtF-box and AtF-box, being a key enzyme in the biosynthesis pathway of the branched-chain amino acid leucine. For further detailed analysis, we focused on AtF-box and its role during the cell division cycle. Based on this work, we suggest a mechanism for the role of the studied F-box gene in regulation of leucine homeostasis, which is important for growth. © 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.

Citation

Anelia Iantcheva, Miroslava Zhiponova, Miglena Revalska, Jefri Heyman, Ivayla Dincheva, Ilian Badjakov, Nathan De Geyter, Irina Boycheva, Sofie Goormachtig, Lieven De Veylder. A common F-box gene regulates the leucine homeostasis of Medicago truncatula and Arabidopsis thaliana. Protoplasma. 2022 Mar;259(2):277-290