+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-39386 | |||||||||
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Title | The loacl refined map of DSR2 and NAD structure | |||||||||
Map data | ||||||||||
Sample |
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Keywords | Complex / IMMUNE SYSTEM | |||||||||
Biological species | Bacillus subtilis (bacteria) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 9.74 Å | |||||||||
Authors | Zheng J / Yang X | |||||||||
Funding support | China, 1 items
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Citation | Journal: Int J Biol Macromol / Year: 2024 Title: Structural insights into autoinhibition and activation of defense-associated sirtuin protein. Authors: Xu Yang / Yiqun Wang / Jianting Zheng / Abstract: Bacterial defense-associated sirtuin 2 (DSR2) proteins harbor an N-terminal sirtuin (SIR2) domain degrading NAD. DSR2 from Bacillus subtilis 29R is autoinhibited and unable to hydrolyze NAD in the ...Bacterial defense-associated sirtuin 2 (DSR2) proteins harbor an N-terminal sirtuin (SIR2) domain degrading NAD. DSR2 from Bacillus subtilis 29R is autoinhibited and unable to hydrolyze NAD in the absence of phage infection. A tail tube protein (TTP) of phage SPR activates the DSR2 while a DSR2-inhibiting protein of phage SPbeta, known as DSAD1 (DSR anti-defense 1), inactivates the DSR2. Although DSR2 structures in complexed with TTP and DSAD1, respectively, have been reported recently, the autoinhibition and activation mechanisms remain incompletely understood. Here, we present cryo-electron microscopy structures of the DSR2-NAD complex in autoinhibited state and the in vitro assembled DSR2-TFD (TTP tube-forming domain) complex in activated state. The DSR2-NAD complex reveals that the autoinhibited DSR2 assembles into an inactive tetramer, binding NAD through a distinct pocket situated outside active site. Binding of TFD into cavities within the sensor domains of DSR2 triggers a conformational change in SIR2 regions, activating its NADase activity, whereas the TTP β-sandwich domain (BSD) is flexible and does not contribute to the activation process. The activated form of DSR2 exists as tetramers and dimers, with the tetramers exhibiting more NADase activity. Overall, our results extend the current understanding of autoinhibition and activation of DSR2 immune proteins. | |||||||||
History |
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-Structure visualization
-Downloads & links
-EMDB archive
Map data | EMDB map data format | |||
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Header (meta data) | EMDB header | |||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-39386 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-39386 | HTTPS FTP |
-Related structure data
Related structure data | 39369 39380 39381 39382 39385 39387 39390 39718 60470 8ykfC 8yl5C 8ylnC 8yltC 8z18C 8ztrC C: citing same article (ref.) |
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-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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-Map
File | Download / File: emd_39386.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Voxel size | X=Y=Z: 0.932 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Sample components
-Entire : the complex of DSR2 and NAD
Entire | Name: the complex of DSR2 and NAD |
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Components |
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-Supramolecule #1: the complex of DSR2 and NAD
Supramolecule | Name: the complex of DSR2 and NAD / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: Bacillus subtilis (bacteria) |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 2.5 mg/mL | |||||||||||||||
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Buffer | pH: 8 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY | |||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 289 K / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN |
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Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | C2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
-Image processing
Startup model | Type of model: NONE |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 9.74 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 259276 |
Initial angle assignment | Type: RANDOM ASSIGNMENT |
Final angle assignment | Type: ANGULAR RECONSTITUTION |