Atomic Structure of Type VI Contractile Sheath from Pseudomonas aeruginosa.

Atomic Structure of Type VI Contractile Sheath from Pseudomonas aeruginosa.
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DOI:
10.1016/j.str.2017.12.005
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发表时间:
2018-02-06
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Freemont PS
Freemont PS
中科院分区:
其他
文献类型:
--
作者:
Salih O;He S;Planamente S;Stach L;MacDonald JT;Manoli E;Scheres SHW;Filloux A;Freemont PS

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铜绿假单胞菌具有三种 VI 型分泌系统 (T6SS):H1-、H2- 和 H3-T6SS,每种都属于不同的组。两个 T6SS 组件 TssB/VipA 和 TssC/VipB 组装形成小管,与收缩噬菌体和化脓菌素的尾鞘保持结构/功能同源性。在这里,我们使用冷冻电子显微镜以 3.3 Å 的分辨率解析了 H1-T6SS 铜绿假单胞菌 TssB1C1 鞘的结构。我们的结构使我们能够解决 T6SS 鞘的一些特征,而这些特征在霍乱弧菌 VipAB 和土拉弗朗西斯菌 IglAB 结构中尚未解决。与其他收缩机器(包括 T4 噬菌体和 R 型脓毒素)的鞘结构进行比较,可以更好地理解这些系统如何在进化过程中保留相似的功能/机制。我们使用铜绿假单胞菌 R2 脓毒素作为结构模板,建立了处于延伸构象的 TssB1C1 鞘的原子模型,使我们能够提出一种用于 T6SS 鞘收缩的卷簧状机制。我们解析了铜绿假单胞菌(第 3 组 T6SSi)的 T6SS 鞘结构。T6SS 组之间的比较表明存在保守的鞘收缩机制。扩展状态模型提出了弹簧状鞘收缩机制的建议。展示了 VI 型分泌系统收缩鞘的原子结构,揭示了独特的特征。与其他系统的比较表明,T6SS 组之间存在保守的鞘收缩机制。通过对伸展状态进行建模,作者提出了一种用于 T6SS 鞘收缩的类似螺旋弹簧的机制。
Pseudomonas aeruginosa has three type VI secretion systems (T6SSs), H1-, H2-, and H3-T6SS, each belonging to a distinct group. The two T6SS components, TssB/VipA and TssC/VipB, assemble to form tubules that conserve structural/functional homology with tail sheaths of contractile bacteriophages and pyocins. Here, we used cryoelectron microscopy to solve the structure of the H1-T6SS P. aeruginosa TssB1C1 sheath at 3.3 Å resolution. Our structure allowed us to resolve some features of the T6SS sheath that were not resolved in the Vibrio cholerae VipAB and Francisella tularensis IglAB structures. Comparison with sheath structures from other contractile machines, including T4 phage and R-type pyocins, provides a better understanding of how these systems have conserved similar functions/mechanisms despite evolution. We used the P. aeruginosa R2 pyocin as a structural template to build an atomic model of the TssB1C1 sheath in its extended conformation, allowing us to propose a coiled-spring-like mechanism for T6SS sheath contraction. We solved a T6SS sheath structure from Pseudomonas aeruginosa (group 3 T6SSi) Comparisons between T6SS groups suggest a conserved sheath contraction mechanism Extended-state model led to proposal of a spring-like sheath contraction mechanism Salih et al. present the atomic structure of a contracted sheath of a type VI secretion system, revealing unique features. Comparison with other systems suggests a conserved sheath contraction mechanism among T6SS groups. Modeling the extended state, the authors suggest a coiled-spring-like mechanism for T6SS sheath contraction.
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