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- EMDB-41322: Myxococcus xanthus EncA protein shell with compartmentalized SNAP... -
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Open data
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Basic information
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Title | Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein | |||||||||
![]() | Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein | |||||||||
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![]() | Encapsulin / nanocompartment / VIRUS LIKE PARTICLE | |||||||||
Function / homology | ![]() methylated-DNA-[protein]-cysteine S-methyltransferase / methylated-DNA-[protein]-cysteine S-methyltransferase activity / encapsulin nanocompartment / DNA modification / iron ion transport / methylation / intracellular iron ion homeostasis / DNA repair / DNA binding / nucleus / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.53 Å | |||||||||
![]() | Andreas MP / Kwon S / Giessen TW | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure and heterogeneity of a highly cargo-loaded encapsulin shell. Authors: Seokmu Kwon / Michael P Andreas / Tobias W Giessen / ![]() Abstract: Encapsulins are self-assembling protein nanocompartments able to selectively encapsulate dedicated cargo enzymes. Encapsulins are widespread across bacterial and archaeal phyla and are involved in ...Encapsulins are self-assembling protein nanocompartments able to selectively encapsulate dedicated cargo enzymes. Encapsulins are widespread across bacterial and archaeal phyla and are involved in oxidative stress resistance, iron storage, and sulfur metabolism. Encapsulin shells exhibit icosahedral geometry and consist of 60, 180, or 240 identical protein subunits. Cargo encapsulation is mediated by the specific interaction of targeting peptides or domains, found in all cargo proteins, with the interior surface of the encapsulin shell during shell self-assembly. Here, we report the 2.53 Å cryo-EM structure of a heterologously produced and highly cargo-loaded T3 encapsulin shell from Myxococcus xanthus and explore the systems' structural heterogeneity. We find that exceedingly high cargo loading results in the formation of substantial amounts of distorted and aberrant shells, likely caused by a combination of unfavorable steric clashes of cargo proteins and shell conformational changes. Based on our cryo-EM structure, we determine and analyze the targeting peptide-shell binding mode. We find that both ionic and hydrophobic interactions mediate targeting peptide binding. Our results will guide future attempts at rationally engineering encapsulins for biomedical and biotechnological applications. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 307.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.7 KB 20.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.4 KB | Display | ![]() |
Images | ![]() | 184.9 KB | ||
Others | ![]() ![]() | 301.2 MB 301.2 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 23.5 KB | Display | |
Data in CIF | ![]() | 30.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8tk7MC 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 | Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.10345 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: Half Map 1
File | emd_41322_half_map_1.map | ||||||||||||
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Annotation | Half Map 1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half Map 2
File | emd_41322_half_map_2.map | ||||||||||||
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Annotation | Half Map 2 | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Myxococcus xanthus EncA protein shell with compartmentalized SNAP...
Entire | Name: Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein |
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Components |
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-Supramolecule #1: Myxococcus xanthus EncA protein shell with compartmentalized SNAP...
Supramolecule | Name: Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
-Supramolecule #2: Myxococcus xanthus EncA encapsulin shell protein
Supramolecule | Name: Myxococcus xanthus EncA encapsulin shell protein / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1 Details: Recombinantly expressed Myxococcus xanthus EncA encapsulin shell with T=3 icosahedral symmetry |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: SNAP-Tag/EncC targeting peptide
Supramolecule | Name: SNAP-Tag/EncC targeting peptide / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 Details: Internalized SNAP-tag/EncC targeting peptide cargo protein |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Type 1 encapsulin shell protein EncA
Macromolecule | Name: Type 1 encapsulin shell protein EncA / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 31.691977 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MPDFLGHAEN PLREEEWARL NETVIQVARR SLVGRRILDI YGPLGAGVQT VPYDEFQGVS PGAVDIVGEQ ETAMVFTDAR KFKTIPIIY KDFLLHWRDI EAARTHNMPL DVSAAAGAAA LCAQQEDELI FYGDARLGYE GLMTANGRLT VPLGDWTSPG G GFQAIVEA ...String: MPDFLGHAEN PLREEEWARL NETVIQVARR SLVGRRILDI YGPLGAGVQT VPYDEFQGVS PGAVDIVGEQ ETAMVFTDAR KFKTIPIIY KDFLLHWRDI EAARTHNMPL DVSAAAGAAA LCAQQEDELI FYGDARLGYE GLMTANGRLT VPLGDWTSPG G GFQAIVEA TRKLNEQGHF GPYAVVLSPR LYSQLHRIYE KTGVLEIETI RQLASDGVYQ SNRLRGESGV VVSTGRENMD LA VSMDMVA AYLGASRMNH PFRVLEALLL RIKHPDAICT LEGAGATERR UniProtKB: Type 1 encapsulin shell protein EncA |
-Macromolecule #2: Methylated-DNA--protein-cysteine methyltransferase
Macromolecule | Name: Methylated-DNA--protein-cysteine methyltransferase / type: protein_or_peptide / ID: 2 Details: Amino acids 1-183 are unresolved SNAP-TAG. Amino acids 184-191 are unresolved linker. Amino acids 192-203 are EncC targeting peptide. Number of copies: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 21.4826 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MGPGSDKDCE MKRTTLDSPL GKLELSGCEQ GLHEIIFLGK GTSAADAVEV PAPAAVLGGP EPLMQATAWL NAYFHQPEAI EEFPVPALH HPVFQQESFT RQVLWKLLKV VKFGEVISYS HLAALAGNPA ATAAVKTALS GNPVPILIPC HRVVQGDLDV G GYEGGLAV ...String: MGPGSDKDCE MKRTTLDSPL GKLELSGCEQ GLHEIIFLGK GTSAADAVEV PAPAAVLGGP EPLMQATAWL NAYFHQPEAI EEFPVPALH HPVFQQESFT RQVLWKLLKV VKFGEVISYS HLAALAGNPA ATAAVKTALS GNPVPILIPC HRVVQGDLDV G GYEGGLAV KEWLLAHEGH RLGKRGGGSG GGSPEKRLTV GSLRR UniProtKB: Methylated-DNA--protein-cysteine methyltransferase |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 3.4 mg/mL | |||||||||
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Buffer | pH: 7.5 Component:
Details: 150 mM NaCl, 20 mM Tris pH 7.5 | |||||||||
Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV |
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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) / Digitization - Dimensions - Width: 4092 pixel / Digitization - Dimensions - Height: 5760 pixel / Number grids imaged: 1 / Number real images: 2610 / Average exposure time: 3.2 sec. / Average electron dose: 49.26 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000 |
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
-Atomic model buiding 1
Initial model | PDB ID: Chain - Source name: PDB / Chain - Initial model type: experimental model |
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Details | The model was initially fit into the map using UCSF ChimeraX. It was then manually refined using Coot, followed by real-space refinement against the map using Phenix. |
Refinement | Space: REAL / Protocol: FLEXIBLE FIT / Overall B value: 89.9 / Target criteria: Cross-correlation coefficient |
Output model | ![]() PDB-8tk7: |