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-Structure paper
タイトル | Structural insights into outer membrane asymmetry maintenance in Gram-negative bacteria by MlaFEDB. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 28, Issue 1, Page 81-91, Year 2021 |
掲載日 | 2020年11月16日 |
著者 | Xiaodi Tang / Shenghai Chang / Wen Qiao / Qinghua Luo / Yuejia Chen / Zhiying Jia / James Coleman / Ke Zhang / Ting Wang / Zhibo Zhang / Changbin Zhang / Xiaofeng Zhu / Xiawei Wei / Changjiang Dong / Xing Zhang / Haohao Dong / |
PubMed 要旨 | The highly asymmetric outer membrane of Gram-negative bacteria functions in the defense against cytotoxic substances, such as antibiotics. The Mla pathway maintains outer membrane lipid asymmetry by ...The highly asymmetric outer membrane of Gram-negative bacteria functions in the defense against cytotoxic substances, such as antibiotics. The Mla pathway maintains outer membrane lipid asymmetry by transporting phospholipids between the inner and outer membranes. It comprises six Mla proteins, MlaFEDBCA, including the ABC transporter MlaFEDB, which functions via an unknown mechanism. Here we determine cryo-EM structures of Escherichia coli MlaFEDB in an apo state and bound to phospholipid, ADP or AMP-PNP to a resolution of 3.3-4.1 Å and establish a proteoliposome-based transport system that includes MlaFEDB, MlaC and MlaA-OmpF to monitor the transport direction of phospholipids. In vitro transport assays and in vivo membrane permeability assays combined with mutagenesis identify functional residues that not only recognize and transport phospholipids but also regulate the activity and structural stability of the MlaFEDB complex. Our results provide mechanistic insights into the Mla pathway, which could aid antimicrobial drug development. |
リンク | Nat Struct Mol Biol / PubMed:33199922 |
手法 | EM (単粒子) |
解像度 | 3.3 - 4.1 Å |
構造データ | EMDB-11547, PDB-6zy2: EMDB-11548, PDB-6zy3: EMDB-11549, PDB-6zy4: EMDB-11555, PDB-6zy9: |
化合物 | ChemComp-PEE: ChemComp-ADP: ChemComp-MG: ChemComp-ANP: |
由来 |
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キーワード | LIPID TRANSPORT / phospholipid / phospholipid transport / ABC transporter / MlaFEDB / MlaFE / MlaD / MlaE / MlaF / MlaB / outer membrane / Mla transport pathway |