Structure-Based Prototype Peptides Targeting the Pseudomonas aeruginosa Type VI Secretion System Effector as a Novel Antibacterial Strategy.

Structure-Based Prototype Peptides Targeting the Pseudomonas aeruginosa Type VI Secretion System Effector as a Novel Antibacterial Strategy.
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靶向铜绿假单胞菌 VI 型分泌系统效应子的基于结构的原型肽作为一种新型抗菌策略

DOI:
10.3389/fcimb.2017.00411
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发表时间:
2017
影响因子:
5.7
通讯作者:
Cui S
Cui S
中科院分区:
医学2区
文献类型:
--
作者:
Gao X;Mu Z;Qin B;Sun Y;Cui S

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VI型分泌系统(T6SS)分泌大量的细菌-细菌竞争毒素。TPLE是一种新发现的跨王国毒素,由T6SS在铜绿假单胞菌中分泌,而TplEi则中和TPLE的毒性作用,以保护细菌自身中毒。阻断Tple-TplEi的相互作用可能会释放毒素,导致细菌细胞死亡。在这项研究中,我们应用结晶学方法设计了一种针对Tple和TplEi相互作用的基于结构的抗菌肽。我们发现,TPLE衍生的多肽(根据形状设计为“L”肽)经过枯草杆菌酶处理后,可以与TplEi形成晶体络合物,并在2.2a时解析出其晶体结构。“L”多肽在体外与TplEi具有较强的结合活性,在体内可释放Tple毒素诱导细菌死亡。我们的研究结果提示,L多肽作为一种毒素激活剂,可能成为治疗铜绿假单胞菌感染的药物先导。我们的发现为T6SS效应器和免疫蛋白可能成为抗细菌感染的潜在药物靶点提供了一个例子。
The type VI secretion system (T6SS) secretes numerous toxins for bacteria-bacteria competition. TplE is a newly identified trans-kingdom toxin secreted by the T6SS in Pseudomonas aeruginosa, while TplEi neutralizes the toxic effect of TplE to protect bacteria autointoxication. Blocking the interaction of TplE-TplEi could unleash the toxin, causing bacterial cell death. In this study, we applied a crystallographic approach to design a structural-based antimicrobial peptides targeting the interaction of TplE and TplEi. We found that a peptide (designed as “L” peptide based on its shape) derived from TplE can form a crystal complex with TplEi after subtilisin treatment and the crystal structure was solved at 2.2Å. The “L” peptide displays strong binding affinity to TplEi in vitro and can release the TplE toxin to induce bacteria death in vivo. Our findings suggest that as a toxin activator, the “L” peptide could be a possible drug lead for treating P. aeruginosa infection. Our findings provide an example that the T6SS effector and immunity protein could be a potential drug target against bacteria infection.
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