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- PDB-7xfi: Structure of nucleosome-DI complex (-50I, Apo state) -

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Basic information

Entry
Database: PDB / ID: 7xfi
TitleStructure of nucleosome-DI complex (-50I, Apo state)
Components
  • (DNA (152-MER)) x 2
  • Histone H2A type 1
  • Histone H2B 1.1
  • Histone H3.2
  • Histone H4
KeywordsDNA BINDING PROTEIN/DNA / Nucleosome / AAG / DNA repair / Base excision repair / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


structural constituent of chromatin / nucleosome / protein heterodimerization activity / DNA binding / nucleoplasm / nucleus
Similarity search - Function
Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A conserved site / Histone H2A signature. / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / Histone H4, conserved site ...Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A conserved site / Histone H2A signature. / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Histone H2B 1.1 / Histone H2A type 1 / Histone H4 / Histone H3.2
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog)
MethodELECTRON MICROSCOPY / single particle reconstruction / negative staining / cryo EM / Resolution: 2.9 Å
AuthorsZheng, L. / Tsai, B. / Gao, N.
Funding support China, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, China) China
CitationJournal: Cell Discov / Year: 2023
Title: Structural and mechanistic insights into the DNA glycosylase AAG-mediated base excision in nucleosome.
Authors: Lvqin Zheng / Bin Tsai / Ning Gao /
Abstract: The engagement of a DNA glycosylase with a damaged DNA base marks the initiation of base excision repair. Nucleosome-based packaging of eukaryotic genome obstructs DNA accessibility, and how DNA ...The engagement of a DNA glycosylase with a damaged DNA base marks the initiation of base excision repair. Nucleosome-based packaging of eukaryotic genome obstructs DNA accessibility, and how DNA glycosylases locate the substrate site on nucleosomes is currently unclear. Here, we report cryo-electron microscopy structures of nucleosomes bearing a deoxyinosine (DI) in various geometric positions and structures of them in complex with the DNA glycosylase AAG. The apo nucleosome structures show that the presence of a DI alone perturbs nucleosomal DNA globally, leading to a general weakening of the interface between DNA and the histone core and greater flexibility for the exit/entry of the nucleosomal DNA. AAG makes use of this nucleosomal plasticity and imposes further local deformation of the DNA through formation of the stable enzyme-substrate complex. Mechanistically, local distortion augmentation, translation/rotational register shift and partial opening of the nucleosome are employed by AAG to cope with substrate sites in fully exposed, occluded and completely buried positions, respectively. Our findings reveal the molecular basis for the DI-induced modification on the structural dynamics of the nucleosome and elucidate how the DNA glycosylase AAG accesses damaged sites on the nucleosome with different solution accessibility.
History
DepositionApr 1, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 19, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 8, 2023Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Histone H3.2
B: Histone H4
C: Histone H2A type 1
D: Histone H2B 1.1
E: Histone H3.2
F: Histone H4
G: Histone H2A type 1
H: Histone H2B 1.1
I: DNA (152-MER)
J: DNA (152-MER)


Theoretical massNumber of molelcules
Total (without water)203,57410
Polymers203,57410
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 4 types, 8 molecules AEBFCGDH

#1: Protein Histone H3.2


Mass: 15421.101 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P84233
#2: Protein Histone H4 /


Mass: 11394.426 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P62799
#3: Protein Histone H2A type 1


Mass: 14093.436 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P06897
#4: Protein Histone H2B 1.1 / H2B1.1


Mass: 13965.265 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P02281

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DNA chain , 2 types, 2 molecules IJ

#5: DNA chain DNA (152-MER)


Mass: 47179.039 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli)
#6: DNA chain DNA (152-MER)


Mass: 46646.695 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli)

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Xenopus laevis (African clawed frog)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: YES / Vitrification applied: YES
EM stainingType: NEGATIVE / Material: Uranyl Acetate
VitrificationCryogen name: NITROGEN

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: DARK FIELD / Nominal defocus max: 1700 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 64 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 55973 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00512282
ELECTRON MICROSCOPYf_angle_d0.79217752
ELECTRON MICROSCOPYf_dihedral_angle_d31.0693570
ELECTRON MICROSCOPYf_chiral_restr0.0652023
ELECTRON MICROSCOPYf_plane_restr0.0061307

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