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- EMDB-9373: Single particle reconstruction of the symmetric core an engineere... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-9373 | |||||||||||||||||||||
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Title | Single particle reconstruction of the symmetric core an engineered protein scaffold | |||||||||||||||||||||
![]() | Single particle reconstruction of the symmetric core of an engineered protein scaffold (DARP14) | |||||||||||||||||||||
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![]() | protein engineering / symmetric scaffold / small protein cryo-EM / display platform / BIOSYNTHETIC PROTEIN | |||||||||||||||||||||
Function / homology | 5-carboxymethyl-2-hydroxymuconate isomerase / 5-carboxymethyl-2-hydroxymuconate isomerase / 5-carboxymethyl-2-hydroxymuconate delta-isomerase activity / Tautomerase/MIF superfamily / : / 5-carboxymethyl-2-hydroxymuconate isomerase![]() | |||||||||||||||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | |||||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.9 Å | |||||||||||||||||||||
![]() | Liu Y / Huynh D | |||||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: A 3.8 Å resolution cryo-EM structure of a small protein bound to an imaging scaffold. Authors: Yuxi Liu / Duc T Huynh / Todd O Yeates / ![]() Abstract: Proteins smaller than about 50 kDa are currently too small to be imaged at high resolution by cryo-electron microscopy (cryo-EM), leaving most protein molecules in the cell beyond the reach of this ...Proteins smaller than about 50 kDa are currently too small to be imaged at high resolution by cryo-electron microscopy (cryo-EM), leaving most protein molecules in the cell beyond the reach of this powerful structural technique. Here we use a designed protein scaffold to bind and symmetrically display 12 copies of a small 26 kDa protein, green fluorescent protein (GFP). We show that the bound cargo protein is held rigidly enough to visualize it at a resolution of 3.8 Å by cryo-EM, where specific structural features of the protein are visible. The designed scaffold is modular and can be modified through modest changes in its amino acid sequence to bind and display diverse proteins for imaging, thus providing a general method to break through the lower size limitation in cryo-EM. | |||||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 85.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21.5 KB 21.5 KB | Display Display | ![]() |
Images | ![]() | 142.6 KB | ||
Masks | ![]() | 91.1 MB | ![]() | |
Filedesc metadata | ![]() | 6.7 KB | ||
Others | ![]() ![]() | 84.7 MB 84.7 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 945 KB | Display | ![]() |
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Full document | ![]() | 944.6 KB | Display | |
Data in XML | ![]() | 13.4 KB | Display | |
Data in CIF | ![]() | 15.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6nhtMC ![]() 9374C ![]() 6nhvC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Single particle reconstruction of the symmetric core of an engineered protein scaffold (DARP14) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Half map: Half map A
File | emd_9373_half_map_1.map | ||||||||||||
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Annotation | Half map A | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half map B
File | emd_9373_half_map_2.map | ||||||||||||
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Annotation | Half map B | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Subunit A with DARPin Subunit B
Entire | Name: Subunit A with DARPin Subunit B |
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Components |
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-Supramolecule #1: Subunit A with DARPin Subunit B
Supramolecule | Name: Subunit A with DARPin Subunit B / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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-Supramolecule #2: Subunit B
Supramolecule | Name: Subunit B / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #2 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: Subunit A with DARPin
Supramolecule | Name: Subunit A with DARPin / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: DARP14 - Subunit A with DARPin
Macromolecule | Name: DARP14 - Subunit A with DARPin / type: protein_or_peptide / ID: 1 / Number of copies: 12 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() Strain: ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3 |
Molecular weight | Theoretical: 34.71782 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MRITTKVGDK GSTRLFGGEE VWKDSPIIEA NGTLDELTSF IGEAKHYVDE EMKGILEEIQ NDIYKIMGEI GSKGKIEGIS EERIAWLLK LILRYMEMVN LKSFVLPGGT LESAKLDVCR TIARRALRKV LTVTREFGIG AEAAAYLLAL SDLLFLLARV I EIEQGKKL ...String: MRITTKVGDK GSTRLFGGEE VWKDSPIIEA NGTLDELTSF IGEAKHYVDE EMKGILEEIQ NDIYKIMGEI GSKGKIEGIS EERIAWLLK LILRYMEMVN LKSFVLPGGT LESAKLDVCR TIARRALRKV LTVTREFGIG AEAAAYLLAL SDLLFLLARV I EIEQGKKL LEAARAGQDD EVRILMANGA DVNAADDVGV TPLHLAAQRG HLEIVEVLLK CGADVNAADL WGQTPLHLAA TA GHLEIVE VLLKNGADVN ARDNIGHTPL HLAAWAGHLE IVEVLLKYGA DVNAQDKFGK TPFDLAIDNG NEDIAEVLQK AA |
-Macromolecule #2: DARP14 - Subunit B
Macromolecule | Name: DARP14 - Subunit B / type: protein_or_peptide / ID: 2 / Number of copies: 12 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() Strain: ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1 |
Molecular weight | Theoretical: 14.346274 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MPHLVIEATA NLRLETSPGE LLEQANKALF ASGQFGEADI KSRFVTLEAY RQGTAAVERA YLHACLSILD GRDIATRTLL GASLCAVLA EAVAGGGEEG VQVSVEVREM ERLSYAKRVV ARQRLEHHHH HH UniProtKB: 5-carboxymethyl-2-hydroxymuconate isomerase |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 1 mg/mL | |||||||||||||||
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Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 | |||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: 2.5 microliter of sample, 0 sec wait, 0 sec drain, 3 sec blot, -15 blot force, grids pre-treated with 0.1% poly-lysine for 6 hours. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 3-20 / Number grids imaged: 1 / Number real images: 1929 / Average exposure time: 8.0 sec. / Average electron dose: 56.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal magnification: 130000 |
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 | Initial local fitting by Chimera and individual residues refined using phenix.real_space_refine |
Refinement | Space: REAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-6nht: |