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- EMDB-37708: MapSPARTA tetramer bound with guide-target -

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Basic information

Entry
Database: EMDB / ID: EMD-37708
TitleMapSPARTA tetramer bound with guide-target
Map data
Sample
  • Complex: Maribacter polysiphoniae short Ago complexed with TIR-APAZ
    • Protein or peptide: Piwi domain-containing protein
    • Protein or peptide: TIR domain-containing protein
    • RNA: RNA (5'-R(P*UP*GP*AP*CP*GP*GP*CP*UP*CP*UP*AP*AP*UP*CP*UP*AP*UP*UP*AP*GP*U)-3')
    • DNA: DNA (25-MER)
KeywordsSPARTA / Ago / Tir / RNA BINDING PROTEIN-DNA-RNA complex
Biological speciesMaribacter polysiphoniae (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsHuang PP / Li ZX / Guo LJ / Xiao YB / Chen MR
Funding support China, 5 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)Nos.2018YFA0902000 China
Ministry of Science and Technology (MoST, China)ZX-2021ZD0203404 China
National Natural Science Foundation of China (NSFC)Nos. 32271330 China
National Natural Science Foundation of China (NSFC)Nos. 32000889 China
National Natural Science Foundation of China (NSFC)Nos. 31970547 China
CitationJournal: To Be Published
Title: Cryo-EM Structure of MapSPARTA
Authors: Huang PP / Guo LJ / Li ZX / Yan PR
History
DepositionOct 8, 2023-
Header (metadata) releaseDec 11, 2024-
Map releaseDec 11, 2024-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_37708.png

Downloads & links

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Map

FileDownload / File: emd_37708.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 384 pix.
= 403.2 Å		1.05 Å/pix.
x 384 pix.
= 403.2 Å		1.05 Å/pix.
x 384 pix.
= 403.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.05 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.13
Minimum - Maximum-0.13922143 - 2.1310132
Average (Standard dev.)0.015681947 (±0.0315431)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 403.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Maribacter polysiphoniae short Ago complexed with TIR-APAZ

EntireName: Maribacter polysiphoniae short Ago complexed with TIR-APAZ
Components
  • Complex: Maribacter polysiphoniae short Ago complexed with TIR-APAZ
    • Protein or peptide: Piwi domain-containing protein
    • Protein or peptide: TIR domain-containing protein
    • RNA: RNA (5'-R(P*UP*GP*AP*CP*GP*GP*CP*UP*CP*UP*AP*AP*UP*CP*UP*AP*UP*UP*AP*GP*U)-3')
    • DNA: DNA (25-MER)

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Supramolecule #1: Maribacter polysiphoniae short Ago complexed with TIR-APAZ

SupramoleculeName: Maribacter polysiphoniae short Ago complexed with TIR-APAZ
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Maribacter polysiphoniae (bacteria)

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Macromolecule #1: Piwi domain-containing protein

MacromoleculeName: Piwi domain-containing protein / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Maribacter polysiphoniae (bacteria)
Molecular weightTheoretical: 58.09141 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: MKELIYIEEP KILFAHGQKC TDARDGLALF GPLNNLYGIK SGVIGTKQGL KIFRDYLDHI QKPIYNSNSI TRPMFPGFEA VFDCKWEST GITFKEVTNE DIGKFLYNSS THKRTYDLVS LFIDKIISAN KNEDENVDVW FVIVPDEIYK YCRPNSVLPK E MVQTKALM ...String:
MKELIYIEEP KILFAHGQKC TDARDGLALF GPLNNLYGIK SGVIGTKQGL KIFRDYLDHI QKPIYNSNSI TRPMFPGFEA VFDCKWEST GITFKEVTNE DIGKFLYNSS THKRTYDLVS LFIDKIISAN KNEDENVDVW FVIVPDEIYK YCRPNSVLPK E MVQTKALM SKSKAKSFRY EPSLFPDINI ELKEQEKEAE TYNYDAQFHD QFKARLLKHT IPTQIFREST LAWRDFKNAF GL PIRDFSK IEGHLAWTIS TAAFYKAGGK PWKLSDVRNG VCYLGLVYKK VEKSKNPRNA CCAAQMFLDN GDGTVFKGEV GPW YNPKNG QYHLEPKEAK ALLSQSLQSY KEQIGEYPKE VFIHAKTRFN HQEWDAFLEV TPKETNLVGV TISKTKPLKL YKTE GDYTI LRGNAYVVNE RSAFLWTVGY VPKIQTALSM EVPNPLFIEI NKGEADIKQV LKDILSLTKL NYNACIFADG EPVTL RFAD KIGEILTAST DIKTPPLAFK YYI

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Macromolecule #2: TIR domain-containing protein

MacromoleculeName: TIR domain-containing protein / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Maribacter polysiphoniae (bacteria)
Molecular weightTheoretical: 53.270594 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: MRNKIFISHA TPDDNDFTRW LALKLIGLGY EVWCDILFLD KGVDFWSNIE KVIREDTCKF LLVSSSYSNQ REGVLKELAV AAKVKKQLK DDKFIIPLAI DEQLSYDDIN IDIVRLNAID FKMSWARGLK DILEAFEKQK VPKEVADASK SNLLYQQIFL H DKSVIEKE ...String:
MRNKIFISHA TPDDNDFTRW LALKLIGLGY EVWCDILFLD KGVDFWSNIE KVIREDTCKF LLVSSSYSNQ REGVLKELAV AAKVKKQLK DDKFIIPLAI DEQLSYDDIN IDIVRLNAID FKMSWARGLK DILEAFEKQK VPKEVADASK SNLLYQQIFL H DKSVIEKE EIYDSNWLSI LSFPEELRFH EYNWMLPKRF DVRELTFPAV RYKNYLCTFA WAYDFTYHLP KTETYHKSKT IR IPTEEIL SGSYDSNFIR NAECKRLIVQ LLNKAFELRM KDKEVQEYEM SNKTAYWLEK GKLEKDKFEK TMLVGKQKDK NWH FAISGA SKLYPFPVLM ISSHIFFTAD GKKLIDSSSV QHSSRRRQGK NWWNNTWRTK LLAFIKYLSD DDTSFYLEMG SEEK VFVSN EPVKFKGNVS YNIPEKNTLE EEAELSGFNQ GEDIEELEEL IENLEAE

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Macromolecule #3: RNA (5'-R(P*UP*GP*AP*CP*GP*GP*CP*UP*CP*UP*AP*AP*UP*CP*UP*AP*UP*UP...

MacromoleculeName: RNA (5'-R(P*UP*GP*AP*CP*GP*GP*CP*UP*CP*UP*AP*AP*UP*CP*UP*AP*UP*UP*AP*GP*U)-3')
type: rna / ID: 3 / Number of copies: 4
Source (natural)Organism: Maribacter polysiphoniae (bacteria)
Molecular weightTheoretical: 6.651949 KDa
SequenceString:
UGACGGCUCU AAUCUAUUAG U

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Macromolecule #4: DNA (25-MER)

MacromoleculeName: DNA (25-MER) / type: dna / ID: 4 / Number of copies: 4 / Classification: DNA
Source (natural)Organism: Maribacter polysiphoniae (bacteria)
Molecular weightTheoretical: 7.675 KDa
SequenceString:
(DC)(DA)(DA)(DC)(DT)(DA)(DA)(DT)(DA)(DG) (DA)(DT)(DT)(DA)(DG)(DA)(DG)(DC)(DC)(DG) (DT)(DC)(DA)(DA)(DT)

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 µm
Sample stageSpecimen 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

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.5 CUT-OFF / Number images used: 183347
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: RANDOM ASSIGNMENT

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