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Abstract
背景回顾:Reactive oxygen species (ROS) play an essential role in plant growth and responses to environmental stresses. Plant cells sense and transduce ROS signaling directly via hydrogen peroxide (H2O2)–mediated posttranslational modifications (PTMs) on protein cysteine residues.
结果1-盐胁迫-H2O2-NTL1-核易位:Here, we show that the H2O2-mediated cysteine oxidation of NAC WITH TRANS-MEMBRANE MOTIF1-LIKE 1 (GmNTL1) in soybean (Glycine max) during salt stress promotes its release from the endoplasmic reticulum (ER) membrane and translocation to the nucleus.
结果2-NTL1-氧化-RbohB:We further show that an oxidative posttranslational modification on GmNTL1 residue Cys-247 steers downstream amplification of ROS production by binding to and activating the promoters of RESPIRATORY BURST OXIDASE HOMOLOG B (GmRbohB) genes, thereby creating a feed-forward loop to fine-tune GmNTL1 activity.
结果3-NTL1促进耐盐性:In addition, oxidation of GmNTL1 Cys-247 directly promotes the expression of CATION H+ EXCHANGER 1 (GmCHX1)/SALT TOLERANCE-ASSOCIATED GENE ON CHROMOSOME 3 (GmSALT3) and Na+/H+Antiporter 1 (GmNHX1). Accordingly, transgenic overexpression of GmNTL1 in soybean increases the H2O2 levels and K+/Na+ ratio in the cell, promotes salt tolerance, and increases yield under salt stress, while an RNA interference–mediated knockdown of GmNTL1 elicits the opposite effects.
结论:Our results reveal that the salt-induced oxidation of GmNTL1 promotes its relocation and transcriptional activity through an H2O2-mediated posttranslational modification on cysteine that improves resilience of soybean against salt stress.
摘 要
活性氧(ROS)在植物生长和环境胁迫响应中扮演着非常重要的作用。植物细胞会通过过氧化氢介导的半胱氨酸残基翻译后修饰,来感知并传递ROS信号。本文中,作者发现在盐胁迫过程中过氧化氢介导的大豆GmNTL1蛋白半胱氨酸氧化,能够促进其自身从内质网膜上释放并转位进入细胞核。作者进一步发现GmNTL1蛋白上247号位的半胱氨酸被氧化修饰后会通过直接结合并激活GmRbohB基因的表达来增加ROS的形成,从而形成了一个前馈回路来精细调控GmNTL1的活性。另外,GmNTL1蛋白Cys-247氧化会促进GmCHX1基因和GmNHX1基因的表达。在大豆中过表达GmNTL1基因会导致过氧化氢的水平增加,同时增加细胞中的钾/纳离子比例,提升盐耐受性,增加盐胁迫下的产量;而通过RNAi干扰敲低GmNTL1的表达会导致相反的表型。综上,本文的研究结果揭示了盐诱导的GmNTL1氧化会通过一个过氧化氢介导的翻译后修饰,促进其自身在细胞中的重定位以及转录因子活性,从而提升大豆对于盐胁迫的适应性。
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个人简介:
1982-1986年,青海师范大学,学士;
1986-1989年,山东大学,硕士;
2000-2003年,山东大学,博士;
1997-1998年,山东大学,讲师;
1998-2003年,山东大学,副教授;
2003年-至今,山东大学,教授。
研究方向:长期从事大豆产量及耐逆性状形成的分子机理及种质创新研究。
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