Directional Porin Binding of Intrinsically Disordered Protein Sequences Promotes Colicin Epitope Display in the Bacterial Periplasm.

Directional Porin Binding of Intrinsically Disordered Protein Sequences Promotes Colicin Epitope Display in the Bacterial Periplasm.
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固有无序蛋白序列的定向孔蛋白结合可促进细菌周期中的结肠表位。

DOI:
10.1021/acs.biochem.8b00621
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发表时间:
2018-07-24
期刊:
影响因子:
2.9
通讯作者:
Kleanthous C
Kleanthous C
中科院分区:
生物学3区
文献类型:
--
作者:
Housden NG;Rassam P;Lee S;Samsudin F;Kaminska R;Sharp C;Goult JD;Francis ML;Khalid S;Bayley H;Kleanthous C

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蛋白质细菌素是一种有效的窄谱抗生素,它利用外膜孔蛋白通过知之甚少的机制杀死细菌。在这里,我们确定如何大肠杆菌素,细菌素特异性大肠杆菌,从事三聚体孔蛋白OmpF启动毒素进入。核酸酶大肠杆菌素ColE 9的N-末端180个残基本质上是非结构化的,并且容纳两个OmpF结合位点(OBS 1和OBS 2),其位于OmpF的孔内并且位于结合周质TolB的表位的侧翼。使用分子动力学模拟,化学三聚,等温滴定量热法,荧光显微镜,和单通道记录平面脂双层测量的组合,我们表明,这种安排是通过OBS 2从OmpF的细胞外表面结合,而OBS 1的相互作用发生从周质面OmpF。我们的研究表明,寡聚孔蛋白的窄孔是如何利用大肠杆菌素无序区域的方向特异性结合,这确保了细菌周质内的激活信号的约束介绍。
Protein bacteriocins are potent narrow spectrum antibiotics that exploit outer membrane porins to kill bacteria by poorly understood mechanisms. Here, we determine how colicins, bacteriocins specific for Escherichia coli, engage the trimeric porin OmpF to initiate toxin entry. The N-terminal ∼80 residues of the nuclease colicin ColE9 are intrinsically unstructured and house two OmpF binding sites (OBS1 and OBS2) that reside within the pores of OmpF and which flank an epitope that binds periplasmic TolB. Using a combination of molecular dynamics simulations, chemical trimerization, isothermal titration calorimetry, fluorescence microscopy, and single channel recording planar lipid bilayer measurements, we show that this arrangement is achieved by OBS2 binding from the extracellular face of OmpF, while the interaction of OBS1 occurs from the periplasmic face of OmpF. Our study shows how the narrow pores of oligomeric porins are exploited by colicin disordered regions for direction-specific binding, which ensures the constrained presentation of an activating signal within the bacterial periplasm.
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