+Open data
-Basic information
Entry | Database: PDB / ID: 7xzj | |||||||||||||||
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Title | Cryo-EM structure of TOC complex from Chlamydomonas reinhardtii. | |||||||||||||||
Components |
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Keywords | TRANSLOCASE / Complex membrane protein outer membrane | |||||||||||||||
Function / homology | Function and homology information chloroplast outer membrane / chloroplast membrane / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / protein transport / hydrolase activity / GTP binding / membrane / metal ion binding Similarity search - Function | |||||||||||||||
Biological species | Chlamydomonas reinhardtii (plant) | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.97 Å | |||||||||||||||
Authors | Liu, H. / Li, A.J. / Liu, Z.F. | |||||||||||||||
Funding support | China, 4items
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Citation | Journal: Nature / Year: 2023 Title: Architecture of chloroplast TOC-TIC translocon supercomplex. Authors: Hao Liu / Anjie Li / Jean-David Rochaix / Zhenfeng Liu / Abstract: Chloroplasts rely on the translocon complexes in the outer and inner envelope membranes (the TOC and TIC complexes, respectively) to import thousands of different nuclear-encoded proteins from the ...Chloroplasts rely on the translocon complexes in the outer and inner envelope membranes (the TOC and TIC complexes, respectively) to import thousands of different nuclear-encoded proteins from the cytosol. Although previous studies indicated that the TOC and TIC complexes may assemble into larger supercomplexes, the overall architectures of the TOC-TIC supercomplexes and the mechanism of preprotein translocation are unclear. Here we report the cryo-electron microscopy structure of the TOC-TIC supercomplex from Chlamydomonas reinhardtii. The major subunits of the TOC complex (Toc75, Toc90 and Toc34) and TIC complex (Tic214, Tic20, Tic100 and Tic56), three chloroplast translocon-associated proteins (Ctap3, Ctap4 and Ctap5) and three newly identified small inner-membrane proteins (Simp1-3) have been located in the supercomplex. As the largest protein, Tic214 traverses the inner membrane, the intermembrane space and the outer membrane, connecting the TOC complex with the TIC proteins. An inositol hexaphosphate molecule is located at the Tic214-Toc90 interface and stabilizes their assembly. Four lipid molecules are located within or above an inner-membrane funnel formed by Tic214, Tic20, Simp1 and Ctap5. Multiple potential pathways found in the TOC-TIC supercomplex may support translocation of different substrate preproteins into chloroplasts. | |||||||||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7xzj.cif.gz | 448.8 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7xzj.ent.gz | 304.1 KB | Display | PDB format |
PDBx/mmJSON format | 7xzj.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7xzj_validation.pdf.gz | 1.3 MB | Display | wwPDB validaton report |
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Full document | 7xzj_full_validation.pdf.gz | 1.4 MB | Display | |
Data in XML | 7xzj_validation.xml.gz | 73.5 KB | Display | |
Data in CIF | 7xzj_validation.cif.gz | 110.6 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/xz/7xzj ftp://data.pdbj.org/pub/pdb/validation_reports/xz/7xzj | HTTPS FTP |
-Related structure data
Related structure data | 33529MC 7xziC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
-Protein , 7 types, 7 molecules 3479AEG
#1: Protein | Mass: 51982.613 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A0A2K3D4W3 |
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#2: Protein | Mass: 39025.082 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8J6H7 |
#3: Protein | Mass: 87333.289 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8IE32 |
#4: Protein | Mass: 102415.258 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A0A2K3CR90 |
#5: Protein | Mass: 232535.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P36495 |
#6: Protein | Mass: 105817.695 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A0A2K3DQY7 |
#7: Protein | Mass: 44598.613 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) References: UniProt: A8HYJ1, Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement |
-Protein/peptide / Non-polymers , 2 types, 2 molecules X
#8: Protein/peptide | Mass: 2166.432 Da / Num. of mol.: 1 / Source method: isolated from a natural source Details: Chain X belongs to an unidentified protein, which contains an alpha helix. The input sequence is a tentative one based on the model. The identity of this chain remains to be revealed in the future. Source: (natural) Chlamydomonas reinhardtii (plant) |
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#9: Chemical | ChemComp-IHP / |
-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Structure of a outer membrane protein complex / Type: COMPLEX / Entity ID: #1-#8 / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: Chlamydomonas reinhardtii (plant) |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1500 nm |
Image recording | Electron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k) |
Image scans | Movie frames/image: 33 |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||
3D reconstruction | Resolution: 2.97 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 796731 / Symmetry type: POINT | ||||||||||||
Atomic model building | Protocol: AB INITIO MODEL / Space: REAL |