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- PDB-9m5x: Cryo-EM structure of Arabidopsis thaliana MET1 -

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Basic information

Entry
Database: PDB / ID: 9m5x
TitleCryo-EM structure of Arabidopsis thaliana MET1
ComponentsDNA (cytosine-5)-methyltransferase 1
KeywordsSTRUCTURAL PROTEIN / DNA methylation
Function / homology
Function and homology information


zygote asymmetric cytokinesis in embryo sac / negative regulation of flower development / DNA-mediated transformation / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / DNA methylation-dependent constitutive heterochromatin formation / methyltransferase activity / methylation / chromatin binding / DNA binding / nucleus
Similarity search - Function
DNA (cytosine-5)-methyltransferase 1-like / DNA (cytosine-5)-methyltransferase 1, replication foci domain / Cytosine specific DNA methyltransferase replication foci domain / : / DNA methylase, C-5 cytosine-specific, conserved site / C-5 cytosine-specific DNA methylases C-terminal signature. / 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 ...DNA (cytosine-5)-methyltransferase 1-like / DNA (cytosine-5)-methyltransferase 1, replication foci domain / Cytosine specific DNA methyltransferase replication foci domain / : / DNA methylase, C-5 cytosine-specific, conserved site / C-5 cytosine-specific DNA methylases C-terminal signature. / 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 / Bromo adjacent homology domain / BAH domain / Bromo adjacent homology (BAH) domain / Bromo adjacent homology (BAH) domain superfamily / BAH domain profile. / S-adenosyl-L-methionine-dependent methyltransferase superfamily
Similarity search - Domain/homology
DNA (cytosine-5)-methyltransferase 1
Similarity search - Component
Biological speciesArabidopsis thaliana (thale cress)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.21 Å
AuthorsKikuchi, A. / Arita, K.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)19H05741, 24K01967, 24K21950 Japan
CitationJournal: To Be Published
Title: Cryo-EM Reveals Evolutionarily Conserved and Distinct Structural Features of Plant CG Maintenance Methyltransferase MET1
Authors: Kikuchi, A. / Nishiyama, A. / Chiba, Y. / Nakanishi, M. / To, K.T. / Arita, K.
History
DepositionMar 6, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 20, 2025Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: DNA (cytosine-5)-methyltransferase 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)173,1802
Polymers173,1141
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: Protein DNA (cytosine-5)-methyltransferase 1 / DNA methyltransferase 01 / DNA methyltransferase 2 / DNA methyltransferase AthI / DNA Metase AthI / ...DNA methyltransferase 01 / DNA methyltransferase 2 / DNA methyltransferase AthI / DNA Metase AthI / M.AthI / DNA methyltransferase DDM2 / Protein DECREASED DNA METHYLATION 2


Mass: 173114.438 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Arabidopsis thaliana (thale cress)
Gene: DMT1, ATHIM, DDM2, DMT01, MET1, MET2, At5g49160, K21P3.3
Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P34881, DNA (cytosine-5-)-methyltransferase
#2: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
Has ligand of interestN
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

ComponentName: MET1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Arabidopsis thaliana (thale cress)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
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: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 54.1 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.21 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 307752 / Symmetry type: POINT
RefinementHighest resolution: 3.21 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0028450
ELECTRON MICROSCOPYf_angle_d0.51711416
ELECTRON MICROSCOPYf_dihedral_angle_d3.6721118
ELECTRON MICROSCOPYf_chiral_restr0.041233
ELECTRON MICROSCOPYf_plane_restr0.0051467

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