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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-30355 | |||||||||
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Title | Cryo_EM map of nucleotide free MlaFEDB complex | |||||||||
![]() | cryo_EM map of nucleotide free MlaFEDB complex | |||||||||
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![]() | MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() phospholipid transfer activity / intermembrane phospholipid transfer / phospholipid transporter activity / phospholipid-translocating ATPase complex / phospholipid transport / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / ATPase-coupled transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex / phospholipid binding / response to antibiotic ...phospholipid transfer activity / intermembrane phospholipid transfer / phospholipid transporter activity / phospholipid-translocating ATPase complex / phospholipid transport / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / ATPase-coupled transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex / phospholipid binding / response to antibiotic / DNA damage response / ATP hydrolysis activity / ATP binding / membrane / plasma membrane / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.9 Å | |||||||||
![]() | Chi XM / Fan QX | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural mechanism of phospholipids translocation by MlaFEDB complex. Authors: Ximin Chi / Qiongxuan Fan / Yuanyuan Zhang / Ke Liang / Li Wan / Qiang Zhou / Yanyan Li / ![]() Abstract: In Gram-negative bacteria, phospholipids are major components of the inner membrane and the inner leaflet of the outer membrane, playing an essential role in forming the unique dual-membrane barrier ...In Gram-negative bacteria, phospholipids are major components of the inner membrane and the inner leaflet of the outer membrane, playing an essential role in forming the unique dual-membrane barrier to exclude the entry of most antibiotics. Understanding the mechanisms of phospholipid translocation between the inner and outer membrane represents one of the major challenges surrounding bacterial phospholipid homeostasis. The conserved MlaFEDB complex in the inner membrane functions as an ABC transporter to drive the translocation of phospholipids between the inner membrane and the periplasmic protein MlaC. However, the mechanism of phospholipid translocation remains elusive. Here we determined three cryo-EM structures of MlaFEDB from Escherichia coli in its nucleotide-free and ATP-bound conformations, and performed extensive functional studies to verify and extend our findings from structural analyses. Our work reveals unique structural features of the entire MlaFEDB complex, six well-resolved phospholipids in three distinct cavities, and large-scale conformational changes upon ATP binding. Together, these findings define the cycle of structural rearrangement of MlaFEDB in action, and suggest that MlaFEDB uses an extrusion mechanism to extract and release phospholipids through the central translocation cavity. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 117.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 13.8 KB 13.8 KB | Display Display | ![]() |
Images | ![]() | 18.2 KB | ||
Filedesc metadata | ![]() | 5.7 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7cgeMC ![]() 7cgnC ![]() 7ch0C M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | cryo_EM map of nucleotide free MlaFEDB complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.087 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : cryo_EM map of nucleotide free MlaFEDB complex
Entire | Name: cryo_EM map of nucleotide free MlaFEDB complex |
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Components |
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-Supramolecule #1: cryo_EM map of nucleotide free MlaFEDB complex
Supramolecule | Name: cryo_EM map of nucleotide free MlaFEDB complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Lipid asymmetry maintenance ABC transporter permease subunit MlaE
Macromolecule | Name: Lipid asymmetry maintenance ABC transporter permease subunit MlaE type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 27.885162 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MLLNALASLG HKGIKTLRTF GRAGLMLFNA LVGKPEFRKH APLLVRQLYN VGVLSMLIIV VSGVFIGMVL GLQGYLVLTT YSAETSLGM LVALSLLREL GPVVAALLFA GRAGSALTAE IGLMRATEQL SSMEMMAVDP LRRVISPRFW AGVISLPLLT V IFVAVGIW ...String: MLLNALASLG HKGIKTLRTF GRAGLMLFNA LVGKPEFRKH APLLVRQLYN VGVLSMLIIV VSGVFIGMVL GLQGYLVLTT YSAETSLGM LVALSLLREL GPVVAALLFA GRAGSALTAE IGLMRATEQL SSMEMMAVDP LRRVISPRFW AGVISLPLLT V IFVAVGIW GGSLVGVSWK GIDSGFFWSA MQNAVDWRMD LVNCLIKSVV FAITVTWISL FNGYDAIPTS AGISRATTRT VV HSSLAVL GLDFVLTALM FGN UniProtKB: Intermembrane phospholipid transport system permease protein MlaE |
-Macromolecule #2: Phospholipid ABC transporter ATP-binding protein MlaF
Macromolecule | Name: Phospholipid ABC transporter ATP-binding protein MlaF / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 29.128801 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MEQSVANLVD MRDVSFTRGN RCIFDNISLT VPRGKITAIM GPSGIGKTTL LRLIGGQIAP DHGEILFDGE NIPAMSRSRL YTVRKRMSM LFQSGALFTD MNVFDNVAYP LREHTQLPAP LLHSTVMMKL EAVGLRGAAK LMPSELSGGM ARRAALARAI A LEPDLIMF ...String: MEQSVANLVD MRDVSFTRGN RCIFDNISLT VPRGKITAIM GPSGIGKTTL LRLIGGQIAP DHGEILFDGE NIPAMSRSRL YTVRKRMSM LFQSGALFTD MNVFDNVAYP LREHTQLPAP LLHSTVMMKL EAVGLRGAAK LMPSELSGGM ARRAALARAI A LEPDLIMF DEPFVGQDPI TMGVLVKLIS ELNSALGVTC VVVSHDVPEV LSIADHAWIL ADKKIVAHGS AQALQANPDP RV RQFLDGI ADGPVPFRYP AGDYHADLLP GS UniProtKB: Phospholipid ABC transporter ATP-binding protein MlaF |
-Macromolecule #3: Lipid asymmetry maintenance protein MlaB
Macromolecule | Name: Lipid asymmetry maintenance protein MlaB / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 10.690313 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSESLSWMQT GDTLALSGEL DQDVLLPLWE MREEAVKGIT CIDLSRVSRV DTGGLALLLH LIDLAKKQGN NVTLQGVNDK VYTLAKLYN LPADVLPR UniProtKB: Lipid asymmetry maintenance protein MlaB |
-Macromolecule #4: Outer membrane lipid asymmetry maintenance protein MlaD
Macromolecule | Name: Outer membrane lipid asymmetry maintenance protein MlaD type: protein_or_peptide / ID: 4 / Number of copies: 6 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 19.593133 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MQTKKNEIWV GIFLLAALLA ALFVCLKAAN VTSIRTEPTY TLYATFDNIG GLKARSPVSI GGVVVGRVAD ITLDPKTYLP RVTLEIEQR YNHIPDTSSL SIRTSGLLGE QYLALNVGFE DPELGTAILK DGDTIQDTKS AMVLEDLIGQ FLYGSKGDDN K NSGDAPAA APGNNETTEP VGTTK UniProtKB: Outer membrane lipid asymmetry maintenance protein MlaD |
-Macromolecule #5: (1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]o...
Macromolecule | Name: (1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-1-[(hexadecanoyloxy)methyl]ethyl (9Z)-octadec-9-enoate type: ligand / ID: 5 / Number of copies: 12 / Formula: PGW |
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Molecular weight | Theoretical: 749.007 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 8 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0.6) / Number images used: 271252 |
Initial angle assignment | Type: OTHER |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |