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- EMDB-37447: Cryo-EM structure of nanodisc (PE:PS:PC) reconstituted GLIC at pH... -
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Open data
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Basic information
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Title | Cryo-EM structure of nanodisc (PE:PS:PC) reconstituted GLIC at pH 4 in open state | |||||||||
![]() | Posprocess masked map of GLIC at pH 4 open state (PE:PS:PC) | |||||||||
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![]() | pentameric ligand-gated ion channels / cis-loop / cryo-EM / nanodisc / MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() sodium channel activity / potassium channel activity / transmembrane transporter complex / extracellular ligand-gated monoatomic ion channel activity / transmembrane signaling receptor activity / identical protein binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.74 Å | |||||||||
![]() | Bharambe N / Li Z / Basak S | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structures of prokaryotic ligand-gated ion channel GLIC provide insights into gating in a lipid environment. Authors: Nikhil Bharambe / Zhuowen Li / David Seiferth / Asha Manikkoth Balakrishna / Philip C Biggin / Sandip Basak / ![]() ![]() Abstract: GLIC, a proton-activated prokaryotic ligand-gated ion channel, served as a model system for understanding the eukaryotic counterparts due to their structural and functional similarities. Despite ...GLIC, a proton-activated prokaryotic ligand-gated ion channel, served as a model system for understanding the eukaryotic counterparts due to their structural and functional similarities. Despite extensive studies conducted on GLIC, the molecular mechanism of channel gating in the lipid environment requires further investigation. Here, we present the cryo-EM structures of nanodisc-reconstituted GLIC at neutral and acidic pH in the resolution range of 2.6 - 3.4 Å. In our apo state at pH 7.5, the extracellular domain (ECD) displays conformational variations compared to the existing apo structures. At pH 4.0, three distinct conformational states (C1, C2 and O states) are identified. The protonated structures exhibit a compacted and counter-clockwise rotated ECD compared with our apo state. A gradual widening of the pore in the TMD is observed upon reducing the pH, with the widest pore in O state, accompanied by several layers of water pentagons. The pore radius and molecular dynamics (MD) simulations suggest that the O state represents an open conductive state. We also observe state-dependent interactions between several lipids and proteins that may be involved in the regulation of channel gating. Our results provide comprehensive insights into the importance of lipids impact on gating. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 11.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 22.3 KB 22.3 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 10.7 KB | Display | ![]() |
Images | ![]() | 118.9 KB | ||
Masks | ![]() | 103 MB | ![]() | |
Filedesc metadata | ![]() | 6.3 KB | ||
Others | ![]() ![]() ![]() ![]() | 80.1 MB 94.6 MB 80.7 MB 80.7 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8wcrMC ![]() 8i41C ![]() 8i42C ![]() 8i47C ![]() 8i48C ![]() 8jj3C ![]() 8wcqC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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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 | Posprocess masked map of GLIC at pH 4 open state (PE:PS:PC) | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.76 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Density Histograms |
-Additional map: Refinement of GLIC at pH 4 open state (PE:PS:PC)
File | emd_37447_additional_1.map | ||||||||||||
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Annotation | Refinement of GLIC at pH 4 open state (PE:PS:PC) | ||||||||||||
Projections & Slices |
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Density Histograms |
-Additional map: Posprocess unmasked map of GLIC at pH 4 open state (PE:PS:PC)
File | emd_37447_additional_2.map | ||||||||||||
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Annotation | Posprocess unmasked map of GLIC at pH 4 open state (PE:PS:PC) | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: half map A of GLIC at pH 4 open state (PE:PS:PC)
File | emd_37447_half_map_1.map | ||||||||||||
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Annotation | half map A of GLIC at pH 4 open state (PE:PS:PC) | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: half map B of GLIC at pH 4 open state (PE:PS:PC)
File | emd_37447_half_map_2.map | ||||||||||||
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Annotation | half map B of GLIC at pH 4 open state (PE:PS:PC) | ||||||||||||
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Density Histograms |
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Sample components
-Entire : pentameric ligand-gated ion channel
Entire | Name: pentameric ligand-gated ion channel |
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Components |
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-Supramolecule #1: pentameric ligand-gated ion channel
Supramolecule | Name: pentameric ligand-gated ion channel / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Proton-gated ion channel
Macromolecule | Name: Proton-gated ion channel / type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 35.699094 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: VSPPPPIADE PLTVNTGIYL IECYSLDDKA ETFKVNAFLS LSWKDRRLAF DPVRSGVRVK TYEPEAIWIP EIRFVNVENA RDADVVDIS VSPDGTVQYL ERFSARVLSP LDFRRYPFDS QTLHIYLIVR SVDTRNIVLA VDLEKVGKND DVFLTGWDIE S FTAVVKPA ...String: VSPPPPIADE PLTVNTGIYL IECYSLDDKA ETFKVNAFLS LSWKDRRLAF DPVRSGVRVK TYEPEAIWIP EIRFVNVENA RDADVVDIS VSPDGTVQYL ERFSARVLSP LDFRRYPFDS QTLHIYLIVR SVDTRNIVLA VDLEKVGKND DVFLTGWDIE S FTAVVKPA NFALEDRLES KLDYQLRISR QYFSYIPNII LPMLFILFIS WTAFWSTSYE ANVTLVVSTL IAHIAFNILV ET NLPKTPY MTYTGAIIFM IYLFYFVAVI EVTVQHYLKV ESQPARAASI TRASRIAFPV VFLLANIILA FLFFG UniProtKB: Proton-gated ion channel |
-Macromolecule #2: CHLORIDE ION
Macromolecule | Name: CHLORIDE ION / type: ligand / ID: 2 / Number of copies: 5 / Formula: CL |
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Molecular weight | Theoretical: 35.453 Da |
-Macromolecule #3: 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
Macromolecule | Name: 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine / type: ligand / ID: 3 / Number of copies: 45 / Formula: PEE |
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Molecular weight | Theoretical: 744.034 Da |
Chemical component information | ![]() ChemComp-PEE: |
-Macromolecule #4: water
Macromolecule | Name: water / type: ligand / ID: 4 / Number of copies: 270 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.5 mg/mL | ||||||||||||
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Buffer | pH: 4 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Support film - Material: GRAPHENE / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec. | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Slit width: 10 eV |
Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Detector mode: COUNTING / Number real images: 14076 / Average exposure time: 6.35 sec. / Average electron dose: 71.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.4000000000000001 µm / Nominal defocus min: 0.6 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |