+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-31904 | |||||||||
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Title | Human TOM complex without cross-linking | |||||||||
Map data | ||||||||||
Sample |
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Keywords | TOM core complex / Cryo-EM / TRANSLOCASE | |||||||||
Function / homology | Function and homology information TOM complex / mitochondrion targeting sequence binding / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / positive regulation of mitophagy in response to mitochondrial depolarization / protein import into mitochondrial matrix / Mitochondrial protein import / protein targeting to mitochondrion / positive regulation of protein targeting to mitochondrion / protein insertion into mitochondrial outer membrane ...TOM complex / mitochondrion targeting sequence binding / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / positive regulation of mitophagy in response to mitochondrial depolarization / protein import into mitochondrial matrix / Mitochondrial protein import / protein targeting to mitochondrion / positive regulation of protein targeting to mitochondrion / protein insertion into mitochondrial outer membrane / porin activity / pore complex / protein transmembrane transporter activity / monoatomic ion transport / PINK1-PRKN Mediated Mitophagy / regulation of protein stability / mitochondrial outer membrane / mitochondrial inner membrane / mitochondrion / membrane / cytosol Similarity search - Function | |||||||||
Biological species | Homo sapiens (human) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.53 Å | |||||||||
Authors | Liu DS / Sui SF | |||||||||
Funding support | China, 1 items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2022 Title: Structural basis of Tom20 and Tom22 cytosolic domains as the human TOM complex receptors. Authors: Jiayue Su / Desheng Liu / Fan Yang / Mei-Qing Zuo / Chang Li / Meng-Qiu Dong / Shan Sun / Sen-Fang Sui / Abstract: Mitochondrial preproteins synthesized in cytosol are imported into mitochondria by a multisubunit translocase of the outer membrane (TOM) complex. Functioned as the receptor, the TOM complex ...Mitochondrial preproteins synthesized in cytosol are imported into mitochondria by a multisubunit translocase of the outer membrane (TOM) complex. Functioned as the receptor, the TOM complex components, Tom 20, Tom22, and Tom70, recognize the presequence and further guide the protein translocation. Their deficiency has been linked with neurodegenerative diseases and cardiac pathology. Although several structures of the TOM complex have been reported by cryoelectron microscopy (cryo-EM), how Tom22 and Tom20 function as TOM receptors remains elusive. Here we determined the structure of TOM core complex at 2.53 Å and captured the structure of the TOM complex containing Tom22 and Tom20 cytosolic domains at 3.74 Å. Structural analysis indicates that Tom20 and Tom22 share a similar three-helix bundle structural feature in the cytosolic domain. Further structure-guided biochemical analysis reveals that the Tom22 cytosolic domain is responsible for binding to the presequence, and the helix H1 is critical for this binding. Altogether, our results provide insights into the functional mechanism of the TOM complex recognizing and transferring preproteins across the mitochondrial membrane. | |||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_31904.map.gz | 62.6 MB | EMDB map data format | |
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Header (meta data) | emd-31904-v30.xml emd-31904.xml | 14.6 KB 14.6 KB | Display Display | EMDB header |
Images | emd_31904.png | 73.5 KB | ||
Filedesc metadata | emd-31904.cif.gz | 5.7 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-31904 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-31904 | HTTPS FTP |
-Validation report
Summary document | emd_31904_validation.pdf.gz | 446.8 KB | Display | EMDB validaton report |
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Full document | emd_31904_full_validation.pdf.gz | 446.4 KB | Display | |
Data in XML | emd_31904_validation.xml.gz | 6.8 KB | Display | |
Data in CIF | emd_31904_validation.cif.gz | 7.8 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-31904 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-31904 | HTTPS FTP |
-Related structure data
Related structure data | 7vd2MC 7vddC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_31904.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Voxel size | X=Y=Z: 0.8433 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Sample components
-Entire : Human TOM complex without cross-linking
Entire | Name: Human TOM complex without cross-linking |
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Components |
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-Supramolecule #1: Human TOM complex without cross-linking
Supramolecule | Name: Human TOM complex without cross-linking / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5 |
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Source (natural) | Organism: Homo sapiens (human) |
-Macromolecule #1: Mitochondrial import receptor subunit TOM6 homolog
Macromolecule | Name: Mitochondrial import receptor subunit TOM6 homolog / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 8.007988 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MASSTVPVSA AGSANETPEI PDNVGDWLRG VYRFATDRND FRRNLILNLG LFAAGVWLAR NLSDIDLMAP QPGV UniProtKB: Mitochondrial import receptor subunit TOM6 homolog |
-Macromolecule #2: Mitochondrial import receptor subunit TOM5 homolog
Macromolecule | Name: Mitochondrial import receptor subunit TOM5 homolog / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 6.045318 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MFRIEGLAPK LDPEEMKRKM REDVISSIRN FLIYVALLRV TPFILKKLDS I UniProtKB: Mitochondrial import receptor subunit TOM5 homolog |
-Macromolecule #3: Mitochondrial import receptor subunit TOM7 homolog
Macromolecule | Name: Mitochondrial import receptor subunit TOM7 homolog / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 6.256473 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MVKLSKEAKQ RLQQLFKGSQ FAIRWGFIPL VIYLGFKRGA DPGMPEPTVL SLLWG UniProtKB: Mitochondrial import receptor subunit TOM7 homolog |
-Macromolecule #4: Mitochondrial import receptor subunit TOM22 homolog
Macromolecule | Name: Mitochondrial import receptor subunit TOM22 homolog / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 15.532528 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MAAAVAAAGA GEPQSPDELL PKGDAEKPEE ELEEDDDEEL DETLSERLWG LTEMFPERVR SAAGATFDLS LFVAQKMYRF SRAALWIGT TSFMILVLPV VFETEKLQME QQQQLQQRQI LLGPNTGLSG GMPGALPSLP GKI UniProtKB: Mitochondrial import receptor subunit TOM22 homolog |
-Macromolecule #5: Mitochondrial import receptor subunit TOM40 homolog
Macromolecule | Name: Mitochondrial import receptor subunit TOM40 homolog / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 37.926926 KDa |
Recombinant expression | Organism: Homo sapiens (human) |
Sequence | String: MGNVLAASSP PAGPPPPPAP ALVGLPPPPP SPPGFTLPPL GGSLGAGTST SRSSERTPGA ATASASGAAE DGACGCLPNP GTFEECHRK CKELFPIQME GVKLTVNKGL SNHFQVNHTV ALSTIGESNY HFGVTYVGTK QLSPTEAFPV LVGDMDNSGS L NAQVIHQL ...String: MGNVLAASSP PAGPPPPPAP ALVGLPPPPP SPPGFTLPPL GGSLGAGTST SRSSERTPGA ATASASGAAE DGACGCLPNP GTFEECHRK CKELFPIQME GVKLTVNKGL SNHFQVNHTV ALSTIGESNY HFGVTYVGTK QLSPTEAFPV LVGDMDNSGS L NAQVIHQL GPGLRSKMAI QTQQSKFVNW QVDGEYRGSD FTAAVTLGNP DVLVGSGILV AHYLQSITPC LALGGELVYH RR PGEEGTV MSLAGKYTLN NWLATVTLGQ AGMHATYYHK ASDQLQVGVE FEASTRMQDT SVSFGYQLDL PKANLLFKGS VDS NWIVGA TLEKKLPPLP LTLALGAFLN HRKNKFQCGF GLTIG UniProtKB: Mitochondrial import receptor subunit TOM40 homolog |
-Macromolecule #6: UNDECANE
Macromolecule | Name: UNDECANE / type: ligand / ID: 6 / Number of copies: 16 / Formula: UND |
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Molecular weight | Theoretical: 156.308 Da |
Chemical component information | ChemComp-UND: |
-Macromolecule #7: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
Macromolecule | Name: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 7 / Number of copies: 27 / Formula: PC1 |
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Molecular weight | Theoretical: 790.145 Da |
Chemical component information | ChemComp-PC1: |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.4 |
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Sugar embedding | Material: Digitonin |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.3 µm |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.53 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 347651 |
Initial angle assignment | Type: COMMON LINE |
Final angle assignment | Type: COMMON LINE |