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Open data
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Basic information
Entry | Database: PDB / ID: 8e2j | |||||||||
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Title | Cryo-EM structure of BIRC6/Smac (from local refinement 1) | |||||||||
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![]() | LIGASE / Ubiquitin / E3 ligase / Apoptosis / Autophagy / IAP | |||||||||
Function / homology | ![]() activation of cysteine-type endopeptidase activity involved in apoptotic process by cytochrome c / Release of apoptotic factors from the mitochondria / CD40 receptor complex / SMAC, XIAP-regulated apoptotic response / Regulation of the apoptosome activity / SMAC (DIABLO) binds to IAPs / SMAC(DIABLO)-mediated dissociation of IAP:caspase complexes / intrinsic apoptotic signaling pathway in response to oxidative stress / extrinsic apoptotic signaling pathway via death domain receptors / intrinsic apoptotic signaling pathway ...activation of cysteine-type endopeptidase activity involved in apoptotic process by cytochrome c / Release of apoptotic factors from the mitochondria / CD40 receptor complex / SMAC, XIAP-regulated apoptotic response / Regulation of the apoptosome activity / SMAC (DIABLO) binds to IAPs / SMAC(DIABLO)-mediated dissociation of IAP:caspase complexes / intrinsic apoptotic signaling pathway in response to oxidative stress / extrinsic apoptotic signaling pathway via death domain receptors / intrinsic apoptotic signaling pathway / mitochondrial intermembrane space / cytoplasmic side of plasma membrane / activation of cysteine-type endopeptidase activity involved in apoptotic process / neuron apoptotic process / positive regulation of apoptotic process / apoptotic process / mitochondrion / cytosol Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.44 Å | |||||||||
![]() | Hunkeler, M. / Fischer, E.S. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structures of BIRC6-client complexes provide a mechanism of SMAC-mediated release of caspases. Authors: Moritz Hunkeler / Cyrus Y Jin / Eric S Fischer / ![]() Abstract: Tight regulation of apoptosis is essential for metazoan development and prevents diseases such as cancer and neurodegeneration. Caspase activation is central to apoptosis, and inhibitor of apoptosis ...Tight regulation of apoptosis is essential for metazoan development and prevents diseases such as cancer and neurodegeneration. Caspase activation is central to apoptosis, and inhibitor of apoptosis proteins (IAPs) are the principal actors that restrain caspase activity and are therefore attractive therapeutic targets. IAPs, in turn, are regulated by mitochondria-derived proapoptotic factors such as SMAC and HTRA2. Through a series of cryo-electron microscopy structures of full-length human baculoviral IAP repeat-containing protein 6 (BIRC6) bound to SMAC, caspases, and HTRA2, we provide a molecular understanding for BIRC6-mediated caspase inhibition and its release by SMAC. The architecture of BIRC6, together with near-irreversible binding of SMAC, elucidates how the IAP inhibitor SMAC can effectively control a processive ubiquitin ligase to respond to apoptotic stimuli. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 159.8 KB | Display | ![]() |
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PDB format | ![]() | 129.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 31.6 KB | Display | |
Data in CIF | ![]() | 43.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 27838MC ![]() 8e2dC ![]() 8e2eC ![]() 8e2fC ![]() 8e2gC ![]() 8e2hC ![]() 8e2iC ![]() 8e2kC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 22161.615 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Protein | Mass: 4868.993 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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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: Baculoviral IAP repeat-containing protein 6 / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES | ||||||||||||||||||||
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Molecular weight | Value: 1.111 MDa / Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: ![]() | ||||||||||||||||||||
Buffer solution | pH: 7.4 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 1.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: added CHAPSO to 0.5 mM | ||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||
Vitrification | Instrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 283.15 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS Details: Data collection in counting mode, using multi-shot scheme (9 holes per stage position, 3 movies per hole) |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 1.365 sec. / Electron dose: 56.379 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 14574 |
EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
Image scans | Width: 5760 / Height: 4092 / Movie frames/image: 50 / Used frames/image: 1-50 |
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Processing
Software | Name: PHENIX / Version: 1.20.1_4487: / Classification: refinement | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 3192460 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.44 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 192025 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: OTHER / Space: REAL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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