Molecular mechanism of SbmA, a promiscuous transporter exploited by antimicrobial peptides.

Molecular mechanism of SbmA, a promiscuous transporter exploited by antimicrobial peptides.
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DOI:
10.1126/sciadv.abj5363
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发表时间:
2021-09-10
期刊:
影响因子:
13.6
通讯作者:
Beis K
Beis K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ghilarov D;Inaba-Inoue S;Stepien P;Qu F;Michalczyk E;Pakosz Z;Nomura N;Ogasawara S;Walker GC;Rebuffat S;Iwata S;Heddle JG;Beis K

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抗菌肽转运蛋白SbmA是ABC和质子驱动转运蛋白之间的进化联系。抗生素代谢产物和抗菌肽介导细菌物种之间的竞争。它们中的许多劫持内外膜蛋白进入细胞。肠道细菌对多种肽类抗生素的敏感性由单个内膜蛋白SbmA控制。为了建立SbmA和相关巴卡A的肽转运的分子机制,我们分别在3.2和6 μ m的局部分辨率下测定了它们的冷冻电子显微镜结构。结构显示出一个以前未知的折叠,定义了一类新的二级转运蛋白命名为SbmA样肽转运蛋白。核心结构域包括保守的谷氨酸,其提供质子易位的途径,为运输提供动力。该结构显示出一个向外开放的构象与一个大的空腔,可以容纳不同的基板。我们提出了抗菌肽摄取的分子机制,为创造窄靶向治疗方法铺平了道路。
Antimicrobial peptide transporter SbmA is an evolutionary link between ABC and proton-driven transporters. Antibiotic metabolites and antimicrobial peptides mediate competition between bacterial species. Many of them hijack inner and outer membrane proteins to enter cells. Sensitivity of enteric bacteria to multiple peptide antibiotics is controlled by the single inner membrane protein SbmA. To establish the molecular mechanism of peptide transport by SbmA and related BacA, we determined their cryo–electron microscopy structures at 3.2 and 6 Å local resolution, respectively. The structures show a previously unknown fold, defining a new class of secondary transporters named SbmA-like peptide transporters. The core domain includes conserved glutamates, which provide a pathway for proton translocation, powering transport. The structures show an outward-open conformation with a large cavity that can accommodate diverse substrates. We propose a molecular mechanism for antibacterial peptide uptake paving the way for creation of narrow-targeted therapeutics.
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