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南京农大沈其荣团队Cell:植物促生新机制!真菌效应蛋白"劫持"宿主生长素转运体 | 热心肠日报

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南京农大沈其荣团队Cell:植物促生新机制!真菌效应蛋白"劫持"宿主生长素转运体 | 热心肠日报
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本文要点

IF: 45.1
Trichoderma swollenin activates AtABCB5-dependent auxin efflux to promote plant development
Jiaxin Lu
Jing LiuSiqi JiangYan XuZhangxin YanLun LiFeng ZhangWei ChenDabing XuYing LiBingyu LiuWaseem Raza
宣伟刘东阳沈其荣
Article|2026-07-23
10.1016/j.cell.2026.07.001

研究背景与设计

针对有益真菌调控植物生长素运输的机制尚不明确,利用拟南芥遗传学、生物化学和结构生物学方法,解析木霉属效应蛋白ThSWO的宿主作用靶点。

核心发现与意义

ThSWO穿透植物细胞壁并结合质膜转运蛋白AtABCB5,促进其磷酸化和吲哚-3-乙酸(IAA)外排,揭示微生物可直接重塑宿主激素运输。

定位与互作验证

ThSWO定位于质膜,并与AtABCB5直接结合,abcb5突变体失去ThSWO诱导的DR5生长素信号和侧根促进效应。

结构构象调控

分子动力学模拟和突变分析表明,ThSWO结合AtABCB5的NBD2/R结构域界面,并通过长程构象耦合调控跨膜区和核苷酸结合区。

磷酸化激活转运

ThSWO促进AtABCB5的Ser640和Ser644磷酸化,缺失磷酸化位点的突变体不再响应ThSWO,磷模拟体则呈持续增强的IAA外排活性,最大反应速度达182.8 nmol/min。

快速细胞响应

ThSWO依赖AtABCB5引发细胞壁酸化、质膜延迟性超极化和胞质环流加速等生长素快速响应事件。

跨物种应用潜力

田间试验中,ThSWO处理提升水稻、玉米、小麦及十字花科作物的生长和产量,增幅为6.7%至41.3%。

核心关键词

木霉属ThSWOAtABCB5植物-微生物互作磷酸化吲哚-3-乙酸外排作物增产

科普解读

在根系与土壤微生物的隐秘对话中,木霉菌(Trichoderma)长期被视为植物的“益友”。这类真菌能促进根系生长、增强养分吸收,甚至帮助植物抵御病原菌侵袭。然而,木霉菌如何精准操控植物发育的核心程序,始终是悬而未决的科学谜题。

Cell近期发表的一项研究,由南京农业大学的沈其荣、刘东阳和宣伟领导的团队,首次揭示了一个令人惊叹的分子机制:木霉菌分泌的膨胀素蛋白ThSWO,竟能穿越植物细胞壁,直接激活宿主细胞膜上的生长素转运体,从而重编程根系发育。

定殖信号的分子追踪

研究团队在拟南芥与哈茨木霉(Trichoderma harzianum)的共培养体系中观察到,真菌菌丝与根系发生物理接触后,侧根数量显著增加,而主根生长受到抑制。这一现象仅出现在真菌成功定殖的根系中。当研究团队敲除真菌的ThSWO基因后,即使在同等孢子接种量下,ΔThswo突变株在根内的定殖量也大幅下降,且完全丧失了促进侧根发育的能力。更为关键的是,直接外源施加纯化的ThSWO蛋白,就足以模拟真菌定殖的效果——在0.4 µM浓度下,ThSWO显著促进拟南芥侧根形成和主根伸长,同时激活核内生长素信号报告基因DR5的表达。

耐人寻味的是,ThSWO处理并未改变根内游离生长素(IAA)的总量。研究团队推测,这一效应并非通过促进生长素合成实现,而是可能改变了生长素在组织水平的局部分布或信号响应模式。

穿越细胞壁的“蛋白信使”

接下来的问题是:ThSWO蛋白如何抵达其作用位点?免疫电镜和荧光共定位分析给出了直接证据。在ThSWO处理的拟南芥和洋葱根尖中,扫描电镜和原子力显微镜观察到细胞壁表面纤维素微纤丝断裂、粗糙度显著增加——表面高度差从对照的40纳米跃升至120纳米。胶体金标记实验更是捕捉到ThSWO在细胞壁外围、基质内部以及穿越细胞壁后靠近质膜的全过程轨迹。在质壁分离实验中,ThSWO-GFP信号随质膜一同收缩,与细胞壁清晰分离,确认其最终定位在质膜而非细胞壁。这意味着,ThSWO通过破坏纤维素非共价键、松动细胞壁结构,为自己开辟了通往质膜的通道。

锁定生长素外排转运体AtABCB5

免疫沉淀-质谱联合酵母双杂交筛选,让研究团队锁定了ThSWO在质膜上的靶标——AtABCB5,一个此前功能未明的ABC转运体家族成员。在异源表达系统中,AtABCB5展现出典型的生长素外排活性,能特异性转运IAA和IBA,而对苯甲酸和色氨酸无效。动力分析显示,其转运遵循米氏动力学,Vmax达182.8 nmol/min/百万细胞,Km为71.10 μM。

当ThSWO与AtABCB5共表达时,IAA外排效率进一步提升。这一增强效应依赖于一个精妙的分子开关:ThSWO结合AtABCB5的NBD2/R结构域界面后,引发R结构域Ser640和Ser644位点的磷酸化。研究团队构建的磷酸化失活突变体(S640A/S644A)在ThSWO处理后无法增强IAA外排,而磷酸化模拟突变体(S640D/S644D)即使在无ThSWO条件下也表现出增强的外排活性,达到野生型蛋白加ThSWO处理后的水平。

分子动力学模拟进一步揭示了别构偶联的精细图景。ThSWO与AtABCB5的NBD2/R结构域界面结合后,通过最短路径网络分析发现,信号从界面起始,经关键枢纽E272分两路传递:一路经R结构域延伸至跨膜螺旋TM8-TM9连接区,另一路经NBD2抵达TMD1和NBD1。这一长程别构耦联网络将效应蛋白结合事件与跨膜转运和核苷酸结合域的功能协调起来。

从细胞响应到田间增产

ThSWO激活AtABCB5后,触发了一系列经典的生长素相关细胞响应。在野生型拟南芥根中,ThSWO处理引起细胞壁酸化、缓慢但持续的膜电位去极化,以及细胞质流动加速——线粒体移动速度和轨迹速度均显著增加。而在abcb5突变体中,这些效应几乎完全消失,确证了AtABCB5是ThSWO促生作用的必要中介。

该机制的农业应用潜力同样令人振奋。田间试验显示,过表达ThSWO的水稻籽粒产量增加41.3%。外源蛋白施用实验中,玉米增产7.9%,小麦增产6.7%,青菜增产13.5%,萝卜增产35.2%。尽管研究团队坦诚指出,作物中AtABCB5同源蛋白的Ser640/Ser644位点并非严格保守,且ThSWO是否直接作用于这些同源物尚未验证,但这一现象仍为微生物辅助作物增产提供了全新策略。

该项研究的意义超越了对单一分子机制的阐明。在病原菌惯于通过效应蛋白操纵宿主免疫的背景下,ThSWO-AtABCB5模块揭示了有益真菌如何通过“劫持”宿主激素转运系统来促进植物发育。这暗示,效应蛋白-转运体耦合可能是植物-微生物互作中一个更为普遍的调控范式。当然,研究团队也指出,ThSWO处理伴随的根际细菌群落变化,以及DR5激活的细胞自主性等问题,仍有待进一步探索。

图片摘要

图片由AI生成,可能有错,请谨慎辨别。
本期10文目录
01
IF: 45.1
Cell
南京农大沈其荣团队Cell:植物促生新机制!真菌效应蛋白"劫持"宿主生长素转运体
02
IF: 15.6
Science Translational Medicine
Science子刊:工程菌"策反"生发中心,为冷肿瘤膀胱癌点燃免疫烽火
03
IF: 13.9
Science Advances
Science子刊:靶向递送改良IL-2,工程双歧杆菌重塑肿瘤微环境
04
IF: 18.1
Nature Communications
NC:结合FIT与微生物组,辅助识别结直肠癌前病变
05
IF: 65.4
JAMA
JAMA综述:胃轻瘫诊疗全景,AGA最新指南的核心路径
06
IF: 15.3
Gut Microbes
山西中医药大学周然/马艳苗等:干酪乳酪杆菌缓解类风湿关节炎的代谢机制
07
IF: 13.2
Carbohydrate Polymers
中国海洋大学尚庆森团队:破解肠道共生菌荚膜多糖的结构密码(综述)
08
Nature Sensors
东南大学王进/姚思聿等Nature子刊:从实验室到餐桌,AI传感预测食品风险还有多远(观点)
09
IF: 14.9
Microbiome
移植剖宫产婴儿菌群,小鼠为何易发胖?
10
IF: 11.3
Allergy: European Journal of Allergy and Clinical Immunology
农场生活防过敏,母体肠道菌群或是关键
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  1. CONNECT:[ UseTime:0.000501s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000595s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006418s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000860s ]
  6. SELECT * FROM `set` [ RunTime:0.012488s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000690s ]
  8. SELECT * FROM `article` WHERE `id` = 601978 LIMIT 1 [ RunTime:0.009791s ]
  9. UPDATE `article` SET `lasttime` = 1785850857 WHERE `id` = 601978 [ RunTime:0.006706s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 601978 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001189s ]
  12. SELECT * FROM `article` WHERE `id` > 601978 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000451s ]
  13. SELECT * FROM `article` WHERE `id` < 601978 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000834s ]
  14. SELECT * FROM `article` WHERE `id` < 601978 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000759s ]
  15. SELECT * FROM `article` WHERE `id` < 601978 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000669s ]
0.124076s