乙酰辅酶A羧化酶
脂肪酸合成
丙酮酸羧化酶
细胞生物学
脂肪酸合酶
调节器
生物
生物化学
脂肪酸
基因
化学
酶
作者
Yajin Ye,Krisztina Nikovics,Alexandra To,Loïc Lepiniec,Eric T. Fedosejevs,Steven R. Van Doren,Sébastien Baud,Jay J. Thelen
标识
DOI:10.1038/s41467-020-20014-5
摘要
Abstract In plants, light-dependent activation of de novo fatty acid synthesis (FAS) is partially mediated by acetyl-CoA carboxylase (ACCase), the first committed step for this pathway. However, it is not fully understood how plants control light-dependent FAS regulation to meet the cellular demand for acyl chains. We report here the identification of a gene family encoding for three small plastidial proteins of the envelope membrane that interact with the α-carboxyltransferase (α-CT) subunit of ACCase and participate in an original mechanism restraining FAS in the light. Light enhances the interaction between carboxyltransferase interactors (CTIs) and α-CT, which in turn attenuates carbon flux into FAS. Knockouts for CTI exhibit higher rates of FAS and marked increase in absolute triacylglycerol levels in leaves, more than 4-fold higher than in wild-type plants. Furthermore, WRINKLED1, a master transcriptional regulator of FAS, positively regulates CTI1 expression by direct binding to its promoter. This study reveals that in addition to light-dependent activation, “envelope docking” of ACCase permits fine-tuning of fatty acid supply during the plant life cycle.
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