複合体: ABC transporter maintaining OM lipid asymmetry, cytoplasmic STAS component
タンパク質・ペプチド: ABC transporter maintaining OM lipid asymmetry, cytoplasmic STAS component
複合体: Toluene tolerance protein Ttg2A
タンパク質・ペプチド: Toluene tolerance protein Ttg2A
複合体: Uncharacterized protein
タンパク質・ペプチド: Uncharacterized protein
キーワード
phospholipid / phospholipid transport / ABC transporter / MlaFEDB / MlaFE / MlaD / MlaE / MlaF / MlaB / outer membrane / Mla transport pathway / LIPID TRANSPORT
機能・相同性
機能・相同性情報
phospholipid transfer activity / intermembrane phospholipid transfer / phospholipid-translocating ATPase complex / phospholipid transport / ATP-binding cassette (ABC) transporter complex / response to antibiotic / DNA damage response / ATP hydrolysis activity / ATP binding / membrane / cytosol 類似検索 - 分子機能
: / : / Probable phospholipid ABC transporter-binding protein MlaD / ABC transport permease subunit MlaE, Proteobacteria / ABC transporter permease MalE / Permease MlaE / STAS domain / Mce/MlaD / MlaD protein / STAS domain profile. ...: / : / Probable phospholipid ABC transporter-binding protein MlaD / ABC transport permease subunit MlaE, Proteobacteria / ABC transporter permease MalE / Permease MlaE / STAS domain / Mce/MlaD / MlaD protein / STAS domain profile. / STAS domain / STAS domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
YrbD protein / Intermembrane phospholipid transport system permease protein MlaE / Intermembrane phospholipid transport system binding protein MlaB / Toluene tolerance protein Ttg2A / Anti-sigma factor antagonist 類似検索 - 構成要素
ジャーナル: Nat Struct Mol Biol / 年: 2021 タイトル: Structural insights into outer membrane asymmetry maintenance in Gram-negative bacteria by MlaFEDB. 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 / ...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 / 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.