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- PDB-7nyy: Cryo-EM structure of the MukBEF monomer -

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Basic information

Entry
Database: PDB / ID: 7nyy
TitleCryo-EM structure of the MukBEF monomer
Components
  • Acyl carrier protein
  • Chromosome partition protein MukB
  • Chromosome partition protein MukE
  • Chromosome partition protein MukF
KeywordsDNA BINDING PROTEIN / SMC-kleisin complex / ATPase
Function / homology
Function and homology information


nucleoid / chromosome condensation / acyl carrier activity / chromosome segregation / DNA replication / cell division / calcium ion binding / DNA binding / ATP binding / cytoplasm
Similarity search - Function
Prokaryotic chromosome segregation/condensation protein MukE / MukE, C-terminal domain / MukE, N-terminal domain / MukE-like family / Chromosome partition protein MukF / Chromosome partition protein MukF, winged-helix domain / Chromosome partition protein MukF, middle domain / Chromosome partition protein MukF, C-terminal domain / MukF, middle domain superfamily / MukF, C-terminal domain superfamily ...Prokaryotic chromosome segregation/condensation protein MukE / MukE, C-terminal domain / MukE, N-terminal domain / MukE-like family / Chromosome partition protein MukF / Chromosome partition protein MukF, winged-helix domain / Chromosome partition protein MukF, middle domain / Chromosome partition protein MukF, C-terminal domain / MukF, middle domain superfamily / MukF, C-terminal domain superfamily / MukF winged-helix domain / MukF middle domain / MukF C-terminal domain / MukB, N-terminal domain / Chromosome partition protein MukB / MukB, hinge domain / MukB, hinge domain superfamily / : / MukB N-terminal / MukB hinge domain / SbcC/RAD50-like, Walker B motif / Acyl carrier protein (ACP) / Phosphopantetheine attachment site / Phosphopantetheine attachment site. / Phosphopantetheine attachment site / ACP-like superfamily / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
4'-PHOSPHOPANTETHEINE / Chromosome partition protein MukF / Chromosome partition protein MukE / Chromosome partition protein MukB / Acyl carrier protein
Similarity search - Component
Biological speciesPhotorhabdus thracensis (bacteria)
Escherichia coli BL21 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.8 Å
AuthorsBuermann, F. / Lowe, J.
Citation
Journal: Mol Cell / Year: 2021
Title: Cryo-EM structure of MukBEF reveals DNA loop entrapment at chromosomal unloading sites.
Authors: Frank Bürmann / Louise F H Funke / Jason W Chin / Jan Löwe /
Abstract: The ring-like structural maintenance of chromosomes (SMC) complex MukBEF folds the genome of Escherichia coli and related bacteria into large loops, presumably by active DNA loop extrusion. MukBEF ...The ring-like structural maintenance of chromosomes (SMC) complex MukBEF folds the genome of Escherichia coli and related bacteria into large loops, presumably by active DNA loop extrusion. MukBEF activity within the replication terminus macrodomain is suppressed by the sequence-specific unloader MatP. Here, we present the complete atomic structure of MukBEF in complex with MatP and DNA as determined by electron cryomicroscopy (cryo-EM). The complex binds two distinct DNA double helices corresponding to the arms of a plectonemic loop. MatP-bound DNA threads through the MukBEF ring, while the second DNA is clamped by the kleisin MukF, MukE, and the MukB ATPase heads. Combinatorial cysteine cross-linking confirms this topology of DNA loop entrapment in vivo. Our findings illuminate how a class of near-ubiquitous DNA organizers with important roles in genome maintenance interacts with the bacterial chromosome.
#1: Journal: Biorxiv / Year: 2021
Title: DNA entrapment revealed by the structure of bacterial condensin MukBEF
Authors: Buermann, F. / Funke, L.F.H. / Chin, J.W. / Lowe, J.
History
DepositionMar 23, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 7, 2021Provider: repository / Type: Initial release
Revision 1.1Mar 23, 2022Group: Database references / Source and taxonomy / Structure summary
Category: citation / citation_author ...citation / citation_author / database_2 / em_entity_assembly / em_entity_assembly_naturalsource / em_entity_assembly_recombinant
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Chromosome partition protein MukB
B: Chromosome partition protein MukB
C: Chromosome partition protein MukF
D: Chromosome partition protein MukF
E: Chromosome partition protein MukE
F: Chromosome partition protein MukE
G: Acyl carrier protein
H: Acyl carrier protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)513,72210
Polymers513,0068
Non-polymers7172
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Chromosome partition protein MukB / Structural maintenance of chromosome-related protein


Mass: 170240.188 Da / Num. of mol.: 2 / Mutation: E1407Q
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Photorhabdus thracensis (bacteria) / Gene: mukB, VY86_15870 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A0F7LRY2
#2: Protein Chromosome partition protein MukF


Mass: 50193.305 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Photorhabdus thracensis (bacteria) / Gene: mukF, VY86_15860 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A0F7LMQ4
#3: Protein Chromosome partition protein MukE


Mass: 27423.848 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Photorhabdus thracensis (bacteria) / Gene: mukE, VY86_15865 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A0F7LPV6
#4: Protein Acyl carrier protein / ACP


Mass: 8645.460 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A6D2XA84
#5: Chemical ChemComp-PNS / 4'-PHOSPHOPANTETHEINE


Mass: 358.348 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C11H23N2O7PS
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

Component
IDNameTypeEntity IDParent-IDSource
1Complex of MukBEF and AcpPCOMPLEX#1-#40MULTIPLE SOURCES
2Complex of MukBEFCOMPLEX#1-#31RECOMBINANT
3Acyl carrier proteinCOMPLEX#41NATURAL
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Photorhabdus thracensis (bacteria)230089
23Escherichia coli BL21(DE3) (bacteria)469008
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.3
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: OTHER
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: UCSF ChimeraX / Version: 1.1/v9 / Classification: model building / URL: https://www.rbvi.ucsf.edu/chimerax/ / Os: Windows / Type: package
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 6.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 96150 / Symmetry type: POINT

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