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- PDB-6x8t: CryoEM structure of the apo-SrpI encapasulin complex from Synecho... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6x8t | |||||||||
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Title | CryoEM structure of the apo-SrpI encapasulin complex from Synechococcus elongatus PCC 7942 | |||||||||
![]() | Protein SrpI | |||||||||
![]() | VIRUS LIKE PARTICLE / encapsulin / nanocompartment / cysteine desulfurase / HK97-fold | |||||||||
Function / homology | Type 2A encapsulin shell protein SrpI-like / : / Type 2A encapsulin shell protein SrpI-like / encapsulin nanocompartment / Type 2A encapsulin shell protein SrpI![]() | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å | |||||||||
![]() | LaFrance, B.J. / Nichols, R.J. / Phillips, N.R. / Oltrogge, L.M. / Valentin-Alvarado, L.E. / Bischoff, A.J. / Savage, D.F. / Nogales, E. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Discovery and characterization of a novel family of prokaryotic nanocompartments involved in sulfur metabolism. Authors: Robert J Nichols / Benjamin LaFrance / Naiya R Phillips / Devon R Radford / Luke M Oltrogge / Luis E Valentin-Alvarado / Amanda J Bischoff / Eva Nogales / David F Savage / ![]() ![]() Abstract: Prokaryotic nanocompartments, also known as encapsulins, are a recently discovered proteinaceous organelle-like compartment in prokaryotes that compartmentalize cargo enzymes. While initial studies ...Prokaryotic nanocompartments, also known as encapsulins, are a recently discovered proteinaceous organelle-like compartment in prokaryotes that compartmentalize cargo enzymes. While initial studies have begun to elucidate the structure and physiological roles of encapsulins, bioinformatic evidence suggests that a great diversity of encapsulin nanocompartments remains unexplored. Here, we describe a novel encapsulin in the freshwater cyanobacterium PCC 7942. This nanocompartment is upregulated upon sulfate starvation and encapsulates a cysteine desulfurase enzyme via an N-terminal targeting sequence. Using cryo-electron microscopy, we have determined the structure of the nanocompartment complex to 2.2 Å resolution. Lastly, biochemical characterization of the complex demonstrated that the activity of the cysteine desulfurase is enhanced upon encapsulation. Taken together, our discovery, structural analysis, and enzymatic characterization of this prokaryotic nanocompartment provide a foundation for future studies seeking to understand the physiological role of this encapsulin in various bacteria. #1: ![]() Title: Discovery and characterization of a novel family of prokaryotic nanocompartments involved in sulfur metabolism Authors: Nichols, R.J. / LaFrance, B.J. / Phillips, N.R. / Oltrogge, L.M. / Valentin-Alvarado, L.E. / Bischoff, A.J. / Nogales, E. / Savage, D.F. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 63.4 KB | Display | ![]() |
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PDB format | ![]() | 44.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1020.9 KB | Display | ![]() |
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Full document | ![]() | 1022.4 KB | Display | |
Data in XML | ![]() | 28.6 KB | Display | |
Data in CIF | ![]() | 39.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22095MC ![]() 6x8mC C: citing same article ( M: map data used to model this data |
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Similar structure data | |
EM raw data | ![]() Data size: 1.6 TB Data #1: Raw Movies for Apo-SrpI Encapsulin collected on 200kV Arctica [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Symmetry | Point symmetry: (Schoenflies symbol: I (icosahedral)) |
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Components
#1: Protein | Mass: 35371.121 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: PCC 7942 / FACHB-805 / Gene: srpI, Synpcc7942_B2662, pANL38 / Plasmid: pET14 / Production host: ![]() ![]() |
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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 |
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Sample preparation
Component | Name: SrpI encapsulin apo complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 2.1 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 10 |
Specimen | Conc.: 2.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil, UltrAuFoil, R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 K Details: blot force 5, 3 sec blot, 100 humidity, 4C, 1 sec drain time |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Microscopy | Model: FEI TECNAI ARCTICA Details: Residual beam tilt corrected in RELION/3.1. CTF refinement performed in RELION/3.1. |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 36000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.6 mm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 40 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2966 |
Image scans | Movie frames/image: 33 |
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Processing
Software | Name: PHENIX / Version: 1.18_3845: / Classification: refinement | ||||||||||||||||||||||||||||||||||||
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EM software |
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Image processing | Details: Images collected in super-resolution mode | ||||||||||||||||||||||||||||||||||||
CTF correction | Details: CTF refinement was performed in Relion/3.1 / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 57431 / Details: Relion LoG autopicker to select particles | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: I (icosahedral) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 34425 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Atomic model building | B value: 20 / Protocol: RIGID BODY FIT / Space: REAL / Target criteria: Correlation coefficient Details: One subunit was built completely de novo based on sequence/density, and iteratively real space refined with neighboring subunits using PHENIX. | ||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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