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- PDB-8eik: Cryo-EM structure of human DNMT3B homo-hexamer -

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Basic information

Entry
Database: PDB / ID: 8eik
TitleCryo-EM structure of human DNMT3B homo-hexamer
ComponentsDNA (cytosine-5)-methyltransferase 3B
KeywordsTRANSFERASE / DNA methyltransferase
Function / homology
Function and homology information


DNA (cytosine-5-)-methyltransferase activity, acting on CpG substrates / : / DNA-methyltransferase activity / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / SUMOylation of DNA methylation proteins / : / catalytic complex / DNA methylation / PRC2 methylates histones and DNA ...DNA (cytosine-5-)-methyltransferase activity, acting on CpG substrates / : / DNA-methyltransferase activity / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / SUMOylation of DNA methylation proteins / : / catalytic complex / DNA methylation / PRC2 methylates histones and DNA / Defective pyroptosis / NoRC negatively regulates rRNA expression / transcription corepressor activity / positive regulation of gene expression / negative regulation of transcription by RNA polymerase II / DNA binding / nucleoplasm / metal ion binding / nucleus
Similarity search - Function
DNA (cytosine-5)-methyltransferase 3B, ADD domain / : / DNMT3, ADD PHD zinc finger / DNMT3, cysteine rich ADD domain / Cysteine rich ADD domain in DNMT3 / ADD domain / ADD domain profile. / DNA methylase, C-5 cytosine-specific, active site / C-5 cytosine-specific DNA methylases active site. / C-5 cytosine-specific DNA methylase (Dnmt) domain profile. ...DNA (cytosine-5)-methyltransferase 3B, ADD domain / : / DNMT3, ADD PHD zinc finger / DNMT3, cysteine rich ADD domain / Cysteine rich ADD domain in DNMT3 / ADD domain / ADD domain profile. / DNA methylase, C-5 cytosine-specific, active site / C-5 cytosine-specific DNA methylases active site. / C-5 cytosine-specific DNA methylase (Dnmt) domain profile. / C-5 cytosine methyltransferase / C-5 cytosine-specific DNA methylase / domain with conserved PWWP motif / PWWP domain / PWWP domain profile. / PWWP domain / Zinc finger, FYVE/PHD-type / S-adenosyl-L-methionine-dependent methyltransferase superfamily
Similarity search - Domain/homology
S-ADENOSYL-L-HOMOCYSTEINE / DNA (cytosine-5)-methyltransferase 3B
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.19 Å
AuthorsLu, J.W. / Song, J.K.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI) United States
CitationJournal: Nucleic Acids Res / Year: 2023
Title: Structural basis for the allosteric regulation and dynamic assembly of DNMT3B.
Authors: Jiuwei Lu / Jian Fang / Hongtao Zhu / Kimberly Lu Liang / Nelli Khudaverdyan / Jikui Song /
Abstract: Oligomerization of DNMT3B, a mammalian de novo DNA methyltransferase, critically regulates its chromatin targeting and DNA methylation activities. However, how the N-terminal PWWP and ADD domains ...Oligomerization of DNMT3B, a mammalian de novo DNA methyltransferase, critically regulates its chromatin targeting and DNA methylation activities. However, how the N-terminal PWWP and ADD domains interplay with the C-terminal methyltransferase (MTase) domain in regulating the dynamic assembly of DNMT3B remains unclear. Here, we report the cryo-EM structure of DNMT3B under various oligomerization states. The ADD domain of DNMT3B interacts with the MTase domain to form an autoinhibitory conformation, resembling the previously observed DNMT3A autoinhibition. Our combined structural and biochemical study further identifies a role for the PWWP domain and its associated ICF mutation in the allosteric regulation of DNMT3B tetramer, and a differential functional impact on DNMT3B by potential ADD-H3K4me0 and PWWP-H3K36me3 bindings. In addition, our comparative structural analysis reveals a coupling between DNMT3B oligomerization and folding of its substrate-binding sites. Together, this study provides mechanistic insights into the allosteric regulation and dynamic assembly of DNMT3B.
History
DepositionSep 15, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 20, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 22, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Dec 20, 2023Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DNA (cytosine-5)-methyltransferase 3B
B: DNA (cytosine-5)-methyltransferase 3B
D: DNA (cytosine-5)-methyltransferase 3B
C: DNA (cytosine-5)-methyltransferase 3B
E: DNA (cytosine-5)-methyltransferase 3B
F: DNA (cytosine-5)-methyltransferase 3B
hetero molecules


Theoretical massNumber of molelcules
Total (without water)443,86221
Polymers441,9246
Non-polymers1,93815
Water0
1


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

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Components

#1: Protein
DNA (cytosine-5)-methyltransferase 3B / Dnmt3b / DNA methyltransferase HsaIIIB / DNA MTase HsaIIIB / M.HsaIIIB


Mass: 73654.023 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DNMT3B / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: Q9UBC3, DNA (cytosine-5-)-methyltransferase
#2: Chemical ChemComp-SAH / S-ADENOSYL-L-HOMOCYSTEINE / S-Adenosyl-L-homocysteine


Type: L-peptide linking / Mass: 384.411 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C14H20N6O5S
#3: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: Zn
Has ligand of interestN

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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

ComponentName: DNA (cytosine-5)-methyltransferase 3B / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.2
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: -2100 nm / Nominal defocus min: -1500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 169827 / Symmetry type: POINT

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