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在Pseudomonas putida中对极组织蛋白FimV的功能性表征

Lisa Marie Schmidt¹, Marta Pulido-Sánchez^2,3, Anke Treuner-Lange⁴

¹Institute of Microbiology and Molecular Biology, Justus-Liebig-Universität Gießen, Gießen, Germany.

Journal of bacteriology

|January 12, 2026

概括

Pseudomonas putida FimV (PpFimV) 结合糖素,对鞭毛细胞的运动性和化学反应的位置至关重要. 尽管有结构上的相似之处,但PpFimV与Shewanella putrefaciens HubP等同类具有有限的功能重叠,表明了特定物种的进化.

科学领域:

细菌细胞生物学细菌细胞生物学
蛋白质结构与功能之间的关系.
微生物生理学微生物生理学

背景情况:

像HubP和FimV这样的极地标蛋白对于组织细菌细胞和定位细胞过程至关重要.
这些蛋白质共享保存域 (LysM,跨膜,细胞质,FimV),但在各个基因中表现出较低的同质性.
不同细菌物种中FimV和HubP同类的特定功能在很大程度上仍未被描述.

研究的目的:

为了描述Pseudomonas putida FimV (PpFimV) 的细胞作用.
研究PpFimV及其同类,如Shewanella putrefaciens HubP (SpHubP) 之间的功能性保存和分歧.
阐明鞭毛介导游泳中功能差异的结构基础.

主要方法:

对PpFimV与丁糖结合的生物化学特征.
分析PpFimV在鞭毛运动,化疗,染色体分离和IV型柱体依赖运动中的作用.
在PpFimV和SpHubP之间进行域交换实验,以确定负责不同功能的区域.

主要成果:

PpFimV通过其LysM域非特异地结合丁糖,这对于极地定位至关重要.
对于正常的鞭毛介导游泳和化学反应系统的放置,需要PpFimV,但对于鞭毛数量,染色体分离或IV型柱骨运动性,不需要.
PpFimV和SpHubP的功能重叠有限;PpFimV无法拯救SpHubP的游泳缺陷,反之亦然. 细胞质区域的差异可能解释了不同的游泳功能.

结论:

FimV和HubP是结构同类物,它们已经演化出了独特的,特定于物种的功能.
PpFimV在细菌细胞组织中起着至关重要的作用,特别是在鞭毛细胞运动和化学反应中.
在FimV和HubP同类体中的功能多样性突出显示了细菌里程碑蛋白的适应性进化.

关键词:

HubP HubP 是一个中心.细胞不对称的细胞不对称.标志性的地标标志性的地标极性的极性极性的极性

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