Thanatin targets the intermembrane protein complex required for lipopolysaccharide transport in Escherichia coli.

Thanatin targets the intermembrane protein complex required for lipopolysaccharide transport in Escherichia coli.
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DOI:
10.1126/sciadv.aau2634
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发表时间:
2018-11
期刊:
影响因子:
13.6
通讯作者:
Robinson JA
Robinson JA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Vetterli SU;Zerbe K;Müller M;Urfer M;Mondal M;Wang SY;Moehle K;Zerbe O;Vitale A;Pessi G;Eberl L;Wollscheid B;Robinson JA

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Thanatin靶向LPS转运所需的周质桥中LptA和LptD之间的蛋白-蛋白相互作用。随着许多革兰氏阴性菌对现有类别抗生素的耐药性不断增加,确定抗菌剂发现的新范式是一个重要的研究重点。特别感兴趣的是不对称革兰氏阴性细菌外膜(OM)的生物发生所需的蛋白质。在大多数革兰氏阴性细菌中,7种Lpt蛋白(LptA至LptG)结合形成跨越整个包膜的大分子复合物,其将脂多糖(LPS)分子从其在内膜的组装位点转运到细胞表面,由细胞质中的腺苷5′-三磷酸水解提供动力。周质蛋白LptA包含跨周质的蛋白质桥,其将内膜处的LptB 2FGC连接到锚定在OM中的LptD/E。我们在这里表明,天然存在的,昆虫衍生的抗菌肽thanatin的目标LptA和LptD的周质蛋白质-蛋白质相互作用所需的组装LPT复合物的网络,导致抑制大肠杆菌中的LPS运输和OM生物合成。
Thanatin targets protein-protein interactions between LptA and LptD in the periplasmic bridge required for LPS transport. With the increasing resistance of many Gram-negative bacteria to existing classes of antibiotics, identifying new paradigms in antimicrobial discovery is an important research priority. Of special interest are the proteins required for the biogenesis of the asymmetric Gram-negative bacterial outer membrane (OM). Seven Lpt proteins (LptA to LptG) associate in most Gram-negative bacteria to form a macromolecular complex spanning the entire envelope, which transports lipopolysaccharide (LPS) molecules from their site of assembly at the inner membrane to the cell surface, powered by adenosine 5′-triphosphate hydrolysis in the cytoplasm. The periplasmic protein LptA comprises the protein bridge across the periplasm, which connects LptB2FGC at the inner membrane to LptD/E anchored in the OM. We show here that the naturally occurring, insect-derived antimicrobial peptide thanatin targets LptA and LptD in the network of periplasmic protein-protein interactions required to assemble the Lpt complex, leading to the inhibition of LPS transport and OM biogenesis in Escherichia coli.
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