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- EMDB-38907: The Cryo-EM structure of anti-phage defense associated DSR2 tetra... -

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Basic information

Entry
Database: EMDB / ID: EMD-38907
TitleThe Cryo-EM structure of anti-phage defense associated DSR2 tetramer bound with two DSAD1 inhibitors (opposite side)
Map data
Sample
  • Complex: Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)
    • Protein or peptide: SIR2-like domain-containing protein
    • Protein or peptide: DSR anti-defence 1
KeywordsNADase / anti-phage defense / complex / immune evasion / IMMUNOSUPPRESSANT
Function / homologySIR2-like domain / SIR2-like domain / DHS-like NAD/FAD-binding domain superfamily / : / SIR2-like domain-containing protein
Function and homology information
Biological speciesBacillus subtilis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.33 Å
AuthorsWang RW / Xu Q / Wu ZX / Li JL / Shi ZB / Li FX
Funding support China, 3 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32370742 China
National Natural Science Foundation of China (NSFC)32271264 China
National Natural Science Foundation of China (NSFC)32200129 China
CitationJournal: Nat Commun / Year: 2024
Title: The structural basis of the activation and inhibition of DSR2 NADase by phage proteins.
Authors: Ruiwen Wang / Qi Xu / Zhuoxi Wu / Jialu Li / Hao Guo / Tianzhui Liao / Yuan Shi / Ling Yuan / Haishan Gao / Rong Yang / Zhubing Shi / Faxiang Li /
Abstract: DSR2, a Sir2 domain-containing protein, protects bacteria from phage infection by hydrolyzing NAD. The enzymatic activity of DSR2 is triggered by the SPR phage tail tube protein (TTP), while ...DSR2, a Sir2 domain-containing protein, protects bacteria from phage infection by hydrolyzing NAD. The enzymatic activity of DSR2 is triggered by the SPR phage tail tube protein (TTP), while suppressed by the SPbeta phage-encoded DSAD1 protein, enabling phages to evade the host defense. However, the molecular mechanisms of activation and inhibition of DSR2 remain elusive. Here, we report the cryo-EM structures of apo DSR2, DSR2-TTP-NAD and DSR2-DSAD1 complexes. DSR2 assembles into a head-to-head tetramer mediated by its Sir2 domain. The C-terminal helical regions of DSR2 constitute four partner-binding cavities with opened and closed conformation. Two TTP molecules bind to two of the four C-terminal cavities, inducing conformational change of Sir2 domain to activate DSR2. Furthermore, DSAD1 competes with the activator for binding to the C-terminal cavity of DSR2, effectively suppressing its enzymatic activity. Our results provide the mechanistic insights into the DSR2-mediated anti-phage defense system and DSAD1-dependent phage immune evasion.
History
DepositionJan 29, 2024-
Header (metadata) releaseSep 11, 2024-
Map releaseSep 11, 2024-
UpdateSep 11, 2024-
Current statusSep 11, 2024Processing site: PDBc / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_38907.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 400 pix.
= 430.92 Å		1.08 Å/pix.
x 400 pix.
= 430.92 Å		1.08 Å/pix.
x 400 pix.
= 430.92 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0773 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.6
Minimum - Maximum-0.36849567 - 3.6598105
Average (Standard dev.)0.031480324 (±0.08421995)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 430.91998 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)

EntireName: Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)
Components
  • Complex: Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)
    • Protein or peptide: SIR2-like domain-containing protein
    • Protein or peptide: DSR anti-defence 1

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Supramolecule #1: Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)

SupramoleculeName: Complex of DSR2 tetramer and two DSAD1 inhibitors (opposite side)
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Bacillus subtilis (bacteria)

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Macromolecule #1: SIR2-like domain-containing protein

MacromoleculeName: SIR2-like domain-containing protein / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Bacillus subtilis (bacteria)
Molecular weightTheoretical: 118.635789 KDa
Recombinant expressionOrganism: Escherichia coli B (bacteria)
SequenceString: MVKVDLESKR YGEKLKEVFL MLDNNVVECI KEITESSRNG KLVFFVGAGV STLSDYPQWW RLVDKYHEEL YGSPKKGNYS SDEYLRIPQ IFYNVKGEMA FDGILKDFFQ VDKPTNPIHD KILAMNPAHV ITTNYDNLID TACWKRGKYF SVISAEEDVA N ATSSRYLL ...String:
MVKVDLESKR YGEKLKEVFL MLDNNVVECI KEITESSRNG KLVFFVGAGV STLSDYPQWW RLVDKYHEEL YGSPKKGNYS SDEYLRIPQ IFYNVKGEMA FDGILKDFFQ VDKPTNPIHD KILAMNPAHV ITTNYDNLID TACWKRGKYF SVISAEEDVA N ATSSRYLL KVHGDFRKGF KGENVVLKED DYLNYDQNYP LISNLMKTII ATHTIVFIGY GLGDYNINML LNWVRKLQKD SF HKPFFIR TDPSPIENET LIYYENKGLR IIDAASLIDS NEYDYLERYS AVMDLLIESQ ENKFITKDDE VIDYIYGKIS PLF ALQYIR KIDLKHVFEY DYHFEVNGTV VRHKNKGFGY MERFFELKES CDERSKLSKK QYERFNALFN FFEKNGVICM AKDA GTLNT SIEINSLAYH GKYDVMKKFI EEQSVSIEDD YKKAFFLACL GRWEESYDLY SNIILNSIDE SNGCVYYLSQ INRYR IYQS ITQAVTQFNG LGLLTFGRHY KPFTDEFLAR IEREMTNFNI DDLFNGMPFE FQKKYKILEF LSDNQFLYDD TVKLFE LTN KVRSEMSEGS YSFGMSSDIV VLLRLYDNLR FLYENCLWSV SFHEFHQYIR NSMSLLIEKA EYERTRDIDE LGFSFFG KK SGFFMEYYDF VNISRHFKID DIKNLERSCS IDKIRFGEQE KIEEYLVGIA EEITKQFSAN GMNVVFYTQF ISEAKAAL Y FAKYVKLSEE GLGKIVKALL FYFPERDLDI GKRYVWLERL TKCNELPKSI ISIIDDFLVL QAEKHIDQNY SEVSSNGLY SRDYGALIKH FEKNFISKRL SEITLCLTQD KQKQIDFLFK LLPLLSTNAK SHLLSFKSVE NINDLMNGIR IGLIDEFTPE HEELIIEYL ETRKVNYIVE KEKGIQTFSS NDYMSTFGIW YFLEEINNSK MEEFIGMDDQ YDFFVDPENF DYKKFIPSWL K NYNDKLLG KIAGNKHMKH HVIEVLKERV KNSNDKRYLE ILMNYFI

UniProtKB: SIR2-like domain-containing protein

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Macromolecule #2: DSR anti-defence 1

MacromoleculeName: DSR anti-defence 1 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Bacillus subtilis (bacteria)
Molecular weightTheoretical: 13.87293 KDa
Recombinant expressionOrganism: Escherichia coli B (bacteria)
SequenceString:
MIEIFKDTGA THDLVYHSKI NTFVWDVEFD IVLSDSKELN KCYFVKCFNP YRINGKCDFA VSSIDIFSEG KRLLIENEFN FKITKAVHV ATSKDVTEIV LHLSERISSP FPIVKEVVYL D

UniProtKB: UNIPROTKB: A0A9P1J8U5

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.5 mg/mL
BufferpH: 7.5 / Details: 20 mM HEPES pH 7.5, 100 mM NaCl, 0.5 mM TCEP
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 13000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.33 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 91205
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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Atomic model buiding 1

RefinementProtocol: RIGID BODY FIT
Output model

PDB-8y3y:
The Cryo-EM structure of anti-phage defense associated DSR2 tetramer bound with two DSAD1 inhibitors (opposite side)

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