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Structural insights into the inhibition of type VI effector Tae3 by its immunity protein Tai3
董程;Dong, C; 高增强;Zhang, H; Gao, ZQ; Wang, WJ; She, Z; Liu, GF; Shen, YQ; Su, XD; Dong, YH; Wang WJ(王文佳);  She Z(佘准);  Liu GF(刘广峰);  Dong YH(董宇辉)
2013
发表期刊BIOCHEMICAL JOURNAL
卷号454期号:1页码:59-68
摘要The recently described T6SS (type VI secretion system) acts as a needle that punctures the membrane of the target cells to deliver effector proteins. Type VI amidase effectors can be classified into four divergent families (Tae1-Tae4). These effectors are secreted into the periplasmic space of neighbouring cells via the T6SS and subsequently rupture peptidoglycan. However, the donor cells are protected from damage because of the presence of their cognate immunity proteins [Tai1 (type VI amidase immunity 1)-Tai4]. In the present paper, we describe the structure of Tae3 in complex with Tai3. The Tae3-Tai3 complex exists as a stable heterohexamer, which is composed of two Tae3 molecules and two Tai3 homodimers (Tae3-Tai3(4)-Tae3). Tae3 shares a common NlpC/P60 fold, which consists of N-terminal and C-terminal subdomains. Structural analysis indicates that two unique loops around the catalytic cleft adopt a closed conformation, resulting in a narrow and extended groove involved in the binding of the substrate. The inhibition of Tae3 is attributed to the insertion of the Omega-loop (loop of alpha 3-alpha 4) of Tai3 into the catalytic groove. Furthermore, a cell viability assay confirmed that a conserved motif (Gln-Asp-Xaa) in Tai3 members may play a key role in the inhibition process. Taken together, the present study has revealed a novel inhibition mechanism and provides insights into the role played by T6SS in interspecific competition.
关键词NlpC/P60 type VI secretion system (T6SS) type VI amidase effector 3 type VI amidase immunity 3
学科领域Biochemistry & Molecular Biology
DOI10.1042/BJ20130193
收录类别SCI
WOS记录号WOS:000322934000006
引用统计
被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/223811
专题多学科研究中心
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GB/T 7714
董程;Dong, C,高增强;Zhang, H,Gao, ZQ,et al. Structural insights into the inhibition of type VI effector Tae3 by its immunity protein Tai3[J]. BIOCHEMICAL JOURNAL,2013,454(1):59-68.
APA 董程;Dong, C.,高增强;Zhang, H.,Gao, ZQ.,Wang, WJ.,She, Z.,...&王文佳;佘准;刘广峰;董宇辉.(2013).Structural insights into the inhibition of type VI effector Tae3 by its immunity protein Tai3.BIOCHEMICAL JOURNAL,454(1),59-68.
MLA 董程;Dong, C,et al."Structural insights into the inhibition of type VI effector Tae3 by its immunity protein Tai3".BIOCHEMICAL JOURNAL 454.1(2013):59-68.
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