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Open data
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Basic information
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Title | Structure of Arabidopsis thaliana CLCa | |||||||||
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Function / homology | ![]() nitrate transmembrane transport / nitrate transmembrane transporter activity / response to nitrate / voltage-gated chloride channel activity / chloride transport / chloride channel complex Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.84 Å | |||||||||
![]() | Ji S / Jin H / Kaiming Z / Mingxing W / Shanshan L / Long C | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of the plant nitrate transporter AtCLCa reveals characteristics of the anion-binding site and the ATP-binding pocket. Authors: Jin He / Mingxing Wang / Shanshan Li / Long Chen / Kaiming Zhang / Ji She / ![]() Abstract: Nitrate is one of the major nitrogen sources for most plants. Chloride channel (CLC) proteins mediate the transport and vacuole storage of nitrate in plants, but the structural basis of nitrate ...Nitrate is one of the major nitrogen sources for most plants. Chloride channel (CLC) proteins mediate the transport and vacuole storage of nitrate in plants, but the structural basis of nitrate transport by plant CLC proteins remains unknown. Here, we solved the cryo-EM structure of ATP-bound Arabidopsis thaliana CLCa (AtCLCa) at 2.8 Å resolution. Structural comparison between nitrate-selective AtCLCa and chloride-selective CLC-7 reveals key differences in the central anion-binding site. We observed that the central nitrate is shifted by ∼1.4 Å from chloride, which is likely caused by a weaker interaction between the anion and Pro160; the side chains of aromatic residues around the central binding site are rearranged to accommodate the larger nitrate. Additionally, we identified the ATP-binding pocket of AtCLCa to be located between the cytosolic cystathionine β-synthase domains and the N-terminus. The N-terminus may mediate the ATP inhibition of AtCLCa by interacting with both ATP and the pore-forming transmembrane helix. Together, our studies provide insights into the nitrate selectivity and ATP regulation of plant CLCs. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 483.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14.8 KB 14.8 KB | Display Display | ![]() |
Images | ![]() | 64.4 KB | ||
Others | ![]() ![]() | 474.9 MB 474.9 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7xa9MC 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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Voxel size | X=Y=Z: 0.82 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_33088_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_33088_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : AtCLCa
Entire | Name: AtCLCa |
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Components |
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-Supramolecule #1: AtCLCa
Supramolecule | Name: AtCLCa / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Chloride channel protein CLC-a
Macromolecule | Name: Chloride channel protein CLC-a / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 88.17682 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MDEDGNLQIS NSNYNGEEEG EDPENNTLNQ PLLKRHRTLS STPLALVGAK VSHIESLDYE INENDLFKHD WRSRSKAQVF QYIFLKWTL ACLVGLFTGL IATLINLAVE NIAGYKLLAV GYYIAQDRFW TGLMVFTGAN LGLTLVATVL VVYFAPTAAG P GIPEIKAY ...String: MDEDGNLQIS NSNYNGEEEG EDPENNTLNQ PLLKRHRTLS STPLALVGAK VSHIESLDYE INENDLFKHD WRSRSKAQVF QYIFLKWTL ACLVGLFTGL IATLINLAVE NIAGYKLLAV GYYIAQDRFW TGLMVFTGAN LGLTLVATVL VVYFAPTAAG P GIPEIKAY LNGIDTPNMF GFTTMMVKIV GSIGAVAAGL DLGKEGPLVH IGSCIASLLG QGGPDNHRIK WRWLRYFNND RD RRDLITC GSASGVCAAF RSPVGGVLFA LEEVATWWRS ALLWRTFFST AVVVVVLRAF IEICNSGKCG LFGSGGLIMF DVS HVEVRY HAADIIPVTL IGVFGGILGS LYNHLLHKVL RLYNLINQKG KIHKVLLSLG VSLFTSVCLF GLPFLAECKP CDPS IDEIC PTNGRSGNFK QFNCPNGYYN DLSTLLLTTN DDAVRNIFSS NTPNEFGMVS LWIFFGLYCI LGLITFGIAT PSGLF LPII LMGSAYGRML GTAMGSYTNI DQGLYAVLGA ASLMAGSMRM TVSLCVIFLE LTNNLLLLPI TMFVLLIAKT VGDSFN LSI YEIILHLKGL PFLEANPEPW MRNLTVGELN DAKPPVVTLN GVEKVANIVD VLRNTTHNAF PVLDGADQNT GTELHGL IL RAHLVKVLKK RWFLNEKRRT EEWEVREKFT PVELAEREDN FDDVAITSSE MQLYVDLHPL TNTTPYTVVQ SMSVAKAL V LFRSVGLRHL LVVPKIQASG MSPVIGILTR QDLRAYNILQ AFPHLDKHKS GKARASGGSL EVLFQGPGGS GGSWSHPQF EK |
-Macromolecule #2: NITRATE ION
Macromolecule | Name: NITRATE ION / type: ligand / ID: 2 / Number of copies: 6 / Formula: NO3 |
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Molecular weight | Theoretical: 62.005 Da |
Chemical component information | ![]() ChemComp-NO3: |
-Macromolecule #3: ADENOSINE-5'-TRIPHOSPHATE
Macromolecule | Name: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 3 / Number of copies: 2 / Formula: ATP |
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Molecular weight | Theoretical: 507.181 Da |
Chemical component information | ![]() ChemComp-ATP: |
-Macromolecule #4: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: MG |
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Molecular weight | Theoretical: 24.305 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 |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.5 µm |
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Image processing
Startup model | Type of model: PDB ENTRY PDB model - PDB ID: |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.84 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 2913673 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |