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- PDB-9iua: Cryo-EM structure of the large serine recombinase Bxb1 in complex... -

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Basic information

Entry
Database: PDB / ID: 9iua
TitleCryo-EM structure of the large serine recombinase Bxb1 in complex with attP and attB (GT/TT CDN) in the pre-strand exchange state (attB-L)
Components
  • (attB-L) x 2
  • Integrase
KeywordsDNA BINDING PROTEIN / large serine recombinase
Function / homology
Function and homology information


DNA strand exchange activity / DNA binding
Similarity search - Function
Recombinase / DNA-binding recombinase domain / DNA-binding recombinase domain superfamily / DNA-binding recombinase domain profile. / Resolvase/invertase-type recombinase catalytic domain profile. / : / Resolvase, N-terminal catalytic domain / Resolvase-like, N-terminal catalytic domain superfamily / Resolvase, N terminal domain / Resolvase, N terminal domain
Similarity search - Domain/homology
: / DNA / DNA (> 10) / Integrase
Similarity search - Component
Biological speciesMycobacterium phage Bxb1 (virus)
Mycolicibacterium smegmatis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.78 Å
AuthorsSoma, T. / Hiraizumi, M. / Yamashita, K. / Nishimasu, H.
Funding support Japan, 2items
OrganizationGrant numberCountry
Japan Science and TechnologyJPMJAX232F Japan
Japan Science and TechnologyJPMJCR23B6 Japan
CitationJournal: To Be Published
Title: Cryo-EM structure of the large serine recombinase Bxb1 in complex with attP and attB (GT/TT CDN) in the pre-strand exchange state (attB-L)
Authors: Soma, T.
History
DepositionJul 20, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 4, 2026Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Mar 4, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
G1: attB-L
H1: attB-L
C: Integrase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)70,6484
Polymers70,5833
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: DNA chain attB-L


Mass: 7443.764 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Mycolicibacterium smegmatis (bacteria) / References: GenBank: LN831039.1
#2: DNA chain attB-L


Mass: 6699.307 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Mycolicibacterium smegmatis (bacteria) / References: GenBank: LN831039.1
#3: Protein Integrase


Mass: 56439.949 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycobacterium phage Bxb1 (virus) / Gene: 35, PBI_BXB1_35 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9B086
#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1The large serine recombinase Bxb1 in complex with attP and attB (GT/TT CDN) in the pre-strand exchange state (attB-L)COMPLEX#1-#30MULTIPLE SOURCES
2attB-LCOMPLEX#1-#21SYNTHETIC
3large serine recombinaseCOMPLEX#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
23Mycobacterium phage Bxb1 (virus)2902907
32Mycolicibacterium smegmatis (bacteria)1771
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 51 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
4cryoSPARCCTF correction
7Cootmodel fitting
9Servalcatmodel refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.78 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 266035 / Symmetry type: POINT

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