Structural insights into the function of type VI secretion system TssA subunits.

Structural insights into the function of type VI secretion system TssA subunits.
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DOI:
10.1038/s41467-018-07247-1
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发表时间:
2018-11-12
影响因子:
16.6
通讯作者:
Thomas MS
Thomas MS
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Dix SR;Owen HJ;Sun R;Ahmad A;Shastri S;Spiewak HL;Mosby DJ;Harris MJ;Batters SL;Brooker TA;Tzokov SB;Sedelnikova SE;Baker PJ;Bullough PA;Rice DW;Thomas MS

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VI型分泌系统(T6 SS)是将细菌效应蛋白注入靶细胞的多蛋白复合物。它由锚定在可收缩噬菌体尾状装置上的细胞膜复合物组成,该尾状装置由通过鞘对基板收缩而弹出的尖锐管组成。我们目前的结构和生物化学研究TssA亚基从两个不同的T6 SS揭示了根本不同的四级结构相比,十二聚体E。coli TssA的C-末端序列的差异。尽管如此,不同的TssA保留了与复合物的其他组分的等效相互作用,并且由于其不同的结构域架构,其高度保守的N-末端ImpA_N结构域位于距离鞘中心相同的半径处,所述结构域架构包括额外的间隔区结构域和高度移动的结构域间接头。总之,这些变化允许这些不同的TssA在复合物中执行类似的功能。TssA是细菌VI型分泌系统(T6 SS)的重要组成部分。在这里,Dix等人整合了TssA亚基的结构,系统发育和功能分析,为它们在T6 SS组装和功能中的作用提供了新的见解。
The type VI secretion system (T6SS) is a multi-protein complex that injects bacterial effector proteins into target cells. It is composed of a cell membrane complex anchored to a contractile bacteriophage tail-like apparatus consisting of a sharpened tube that is ejected by the contraction of a sheath against a baseplate. We present structural and biochemical studies on TssA subunits from two different T6SSs that reveal radically different quaternary structures in comparison to the dodecameric E. coli TssA that arise from differences in their C-terminal sequences. Despite this, the different TssAs retain equivalent interactions with other components of the complex and position their highly conserved N-terminal ImpA_N domain at the same radius from the centre of the sheath as a result of their distinct domain architectures, which includes additional spacer domains and highly mobile interdomain linkers. Together, these variations allow these distinct TssAs to perform a similar function in the complex. TssA is an important component of the bacterial type VI secretion system (T6SS). Here, Dix et al. integrate structural, phylogenetic and functional analysis of the TssA subunits, providing new insights into their role in T6SS assembly and function.
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