生物
突变体
脂肪酸合成
拟南芥
调节器
清脆的
脂肪酸
生物化学
细胞生物学
脂肪酸合酶
乙酰辅酶A羧化酶
基因
脂肪酸去饱和酶
丙酮酸羧化酶
多不饱和脂肪酸
酶
作者
Lijuan Zhou,Ying Du,M.N. Zhang,Jincheng Li,Yue Zhao,Xuechun Hu,Kunrong He,Fuliang Cao,Yajin Ye
标识
DOI:10.1093/plcell/koae295
摘要
Abstract In plants, heteromeric acetyl-CoA carboxylase (hetACCase) initiates de novo fatty acid synthesis (FAS) by generating malonyl-CoA in the first committed step of this process. hetACCase activity is precisely regulated to meet the cellular demand for acyl chains during the plant life cycle. In this study, we performed a systematic co-expression analysis of hetACCase and its regulators in Arabidopsis (Arabidopsis thaliana) to better understand the regulatory mechanism of hetACCase. Our analysis uncovered REGULATOR OF FATTY ACID SYNTHESIS 1 (RFS1), whose expression is positively correlated with that of other regulators of hetACCase. The RFS gene family encodes two plastid inner envelope membrane proteins with undiscovered roles. Further analysis revealed that RFS1 co-localizes and directly interacts with CARBOXYLTRANSFERASE INTERACTOR 1 (CTI1). CRISPR/Cas9-mediated knockouts of RFSs exhibit enhanced hetACCase activity, higher FAS rates, and increased fatty acid contents, with particularly marked accumulation of absolute triacylglycerol levels in leaves, similar to cti mutants. The mutations of rfs and cti alter the plastid membrane distribution pattern of α-carboxyltransferase, leading to reduced hetACCase activity on the membrane, which could potentially be the original mechanism through which RFSs restrain hetACCase activity. Thus, we reveal a unique regulatory module that regulates de novo FAS and a genetic locus that may contribute to breeding of improved oil crops.
科研通智能强力驱动
Strongly Powered by AbleSci AI