Significance of NatB-mediated N-terminal acetylation of auxin biosynthetic enzymes in maintaining auxin homeostasis in Arabidopsis thaliana.

Significance of NatB-mediated N-terminal acetylation of auxin biosynthetic enzymes in maintaining auxin homeostasis in Arabidopsis thaliana.
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NatB介导的生长素生物合成酶N端乙酰化在维持拟南芥生长素稳态中的意义。

DOI:
10.1038/s42003-022-04313-9
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发表时间:
2022-12-22
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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生长素IAA(Indole-3-acetic acid)在植物生长发育中起着重要的调节作用,其生物合成、代谢和运输之间的平衡决定了植物生长发育过程中复杂的动态平衡。YUC黄素单加氧酶通过IPyA(indolidopyranvicacid)催化生长素生物合成的限速步骤,并且是调节生长素稳态的关键靶标。尽管关于YUC基因的转录调控已有大量的报道,但在翻译后蛋白水平上的调控却知之甚少。在这里,我们表明,功能的CKRC 3/TCU 2,辅助亚基(Naa 25)的拟南芥NatB,和/或其催化亚基(Naa 20),NBC的损失,导致植物生长素缺乏症。实验表明,CKRC 3/TCU 2可以与NBC相互作用形成NatB复合物,催化YUC蛋白N端乙酰化(NTA),维持植物生长素的正常稳态。因此,我们的研究结果提供了显着的新的见解蛋白质NTA和植物生长素生物合成之间的联系。CKRC 3/TCU 2与NatB催化亚基相互作用形成NatB复合物,催化YUC蛋白的N-末端乙酰化以保持其细胞内稳定性,从而维持植物中生长素的稳态。
The auxin IAA (Indole-3-acetic acid) plays key roles in regulating plant growth and development, which depends on an intricate homeostasis that is determined by the balance between its biosynthesis, metabolism and transport. YUC flavin monooxygenases catalyze the rate-limiting step of auxin biosynthesis via IPyA (indole pyruvic acid) and are critical targets in regulating auxin homeostasis. Despite of numerous reports on the transcriptional regulation of YUC genes, little is known about those at the post-translational protein level. Here, we show that loss of function of CKRC3/TCU2, the auxiliary subunit (Naa25) of Arabidopsis NatB, and/or of its catalytic subunit (Naa20), NBC, led to auxin-deficiency in plants. Experimental evidences show that CKRC3/TCU2 can interact with NBC to form a NatB complex, catalyzing the N-terminal acetylation (NTA) of YUC proteins for their intracellular stability to maintain normal auxin homeostasis in plants. Hence, our findings provide significantly new insight into the link between protein NTA and auxin biosynthesis in plants. CKRC3/TCU2 interacts with the NatB catalytic subunit to form a NatB complex, catalyzing the N-terminal acetylation of YUC proteins for their intracellular stability to maintain auxin homeostasis in plants.
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