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- EMDB-20867: Cryo-EM structure of the Escherichia coli McrBC complex -

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Basic information

Entry
Database: EMDB / ID: EMD-20867
TitleCryo-EM structure of the Escherichia coli McrBC complex
Map dataFL-EcMcrBC
Sample
  • Organelle or cellular component: Complex of the full-length E. coli McrBC
    • Protein or peptide: 5-methylcytosine-specific restriction enzyme B
    • Protein or peptide: Protein McrC
  • Ligand: GUANOSINE-5'-DIPHOSPHATE
  • Ligand: 5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE
  • Ligand: MAGNESIUM ION
KeywordsEndonuclease / AAA protein / GTPase / Methylation-dependent restriction / DNA BINDING PROTEIN
Function / homology
Function and homology information


type IV site-specific deoxyribonuclease activity / restriction endodeoxyribonuclease activity / endonuclease complex / double-stranded methylated DNA binding / hemi-methylated DNA-binding / DNA catabolic process / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / DNA restriction-modification system / endonuclease activity / GTPase activity ...type IV site-specific deoxyribonuclease activity / restriction endodeoxyribonuclease activity / endonuclease complex / double-stranded methylated DNA binding / hemi-methylated DNA-binding / DNA catabolic process / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / DNA restriction-modification system / endonuclease activity / GTPase activity / GTP binding / ATP hydrolysis activity / DNA binding / ATP binding / identical protein binding
Similarity search - Function
5-methylcytosine restriction system component, bacterial / Type IV methyl-directed restriction enzyme EcoKMcrBC / McrBC 5-methylcytosine restriction system component / Type IV methyl-directed restriction enzyme EcoKMcrB subunit, DNA-binding domain / MrcB-like, N-terminal domain / : / ATPase, dynein-related, AAA domain / AAA domain (dynein-related subfamily) / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Type IV methyl-directed restriction enzyme EcoKMcrB subunit / Type IV methyl-directed restriction enzyme EcoKMcrBC
Similarity search - Component
Biological speciesEscherichia coli (strain K12) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.28 Å
AuthorsNiu Y / Suzuki H
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM120242 United States
CitationJournal: Nat Commun / Year: 2020
Title: Structural asymmetry governs the assembly and GTPase activity of McrBC restriction complexes.
Authors: Yiming Niu / Hiroshi Suzuki / Christopher J Hosford / Thomas Walz / Joshua S Chappie /
Abstract: McrBC complexes are motor-driven nucleases functioning in bacterial self-defense by cleaving foreign DNA. The GTP-specific AAA + protein McrB powers translocation along DNA and its hydrolysis ...McrBC complexes are motor-driven nucleases functioning in bacterial self-defense by cleaving foreign DNA. The GTP-specific AAA + protein McrB powers translocation along DNA and its hydrolysis activity is stimulated by its partner nuclease McrC. Here, we report cryo-EM structures of Thermococcus gammatolerans McrB and McrBC, and E. coli McrBC. The McrB hexamers, containing the necessary catalytic machinery for basal GTP hydrolysis, are intrinsically asymmetric. This asymmetry directs McrC binding so that it engages a single active site, where it then uses an arginine/lysine-mediated hydrogen-bonding network to reposition the asparagine in the McrB signature motif for optimal catalytic function. While the two McrBC complexes use different DNA-binding domains, these contribute to the same general GTP-recognition mechanism employed by all G proteins. Asymmetry also induces distinct inter-subunit interactions around the ring, suggesting a coordinated and directional GTP-hydrolysis cycle. Our data provide insights into the conserved molecular mechanisms governing McrB family AAA + motors.
History
DepositionOct 29, 2019-
Header (metadata) releaseJan 29, 2020-
Map releaseOct 21, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.025
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6ut6
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20867.png

Downloads & links

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Map

FileDownload / File: emd_20867.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFL-EcMcrBC
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 400 pix.
= 400. Å		1 Å/pix.
x 400 pix.
= 400. Å		1 Å/pix.
x 400 pix.
= 400. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.025 / Movie #1: 0.025
Minimum - Maximum-0.124876484 - 0.19244
Average (Standard dev.)-0.00013476788 (±0.0027838326)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 400.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z400400400
origin x/y/z0.0000.0000.000
length x/y/z400.000400.000400.000
α/β/γ90.00090.00090.000
start NX/NY/NZ9482110
NX/NY/NZ11313776
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS400400400
D min/max/mean-0.1250.192-0.000

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Supplemental data

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Mask #1

Fileemd_20867_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 2

Fileemd_20867_half_map_1.map
AnnotationHalf map 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 1

Fileemd_20867_half_map_2.map
AnnotationHalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Complex of the full-length E. coli McrBC

EntireName: Complex of the full-length E. coli McrBC
Components
  • Organelle or cellular component: Complex of the full-length E. coli McrBC
    • Protein or peptide: 5-methylcytosine-specific restriction enzyme B
    • Protein or peptide: Protein McrC
  • Ligand: GUANOSINE-5'-DIPHOSPHATE
  • Ligand: 5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Complex of the full-length E. coli McrBC

SupramoleculeName: Complex of the full-length E. coli McrBC / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Escherichia coli (strain K12) (bacteria)

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Macromolecule #1: 5-methylcytosine-specific restriction enzyme B

MacromoleculeName: 5-methylcytosine-specific restriction enzyme B / type: protein_or_peptide / ID: 1 / Number of copies: 6 / Enantiomer: LEVO
EC number: Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 53.212035 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MESIQPWIEK FIKQAQQQRS QSTKDYPTSY RNLRVKLSFG YGNFTSIPWF AFLGEGQEAS NGIYPVILYY KDFDELVLAY GISDTNEPH AQWQFSSDIP KTIAEYFQAT SGVYPKKYGQ SYYACSQKVS QGIDYTRFAS MLDNIINDYK LIFNSGKSVI P PMSKTESY ...String:
MESIQPWIEK FIKQAQQQRS QSTKDYPTSY RNLRVKLSFG YGNFTSIPWF AFLGEGQEAS NGIYPVILYY KDFDELVLAY GISDTNEPH AQWQFSSDIP KTIAEYFQAT SGVYPKKYGQ SYYACSQKVS QGIDYTRFAS MLDNIINDYK LIFNSGKSVI P PMSKTESY CLEDALNDLF IPETTIETIL KRLTIKKNII LQGPPGVGKT FVARRLAYLL TGEKAPQRVN MVQFHQSYSY ED FIQGYRP NGVGFRRKDG IFYNFCQQAK EQPEKKYIFI IDEINRANLS KVFGEVMMLM EHDKRGENWS VPLTYSENDE ERF YVPENV YIIGLMNTAD RSLAVVDYAL RRRFSFIDIE PGFDTPQFRN FLLNKKAEPS FVESLCQKMN ELNQEISKEA TILG KGFRI GHSYFCCGLE DGTSPDTQWL NEIVMTDIAP LLEEYFFDDP YKQQKWTNKL LGDS

UniProtKB: Type IV methyl-directed restriction enzyme EcoKMcrB subunit

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Macromolecule #2: Protein McrC

MacromoleculeName: Protein McrC / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 40.643625 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MEQPVIPVRN IYYMLTYAWG YLQEIKQANL EAIPGNNLLD ILGYVLNKGV LQLSRRGLEL DYNPNTEIIP GIKGRIEFAK TIRGFHLNH GKTVSTFDML NEDTLANRII KSTLAILIKH EKLNSTIRDE ARSLYRKLPG ISTLHLTPQH FSYLNGGKNT R YYKFVISV ...String:
MEQPVIPVRN IYYMLTYAWG YLQEIKQANL EAIPGNNLLD ILGYVLNKGV LQLSRRGLEL DYNPNTEIIP GIKGRIEFAK TIRGFHLNH GKTVSTFDML NEDTLANRII KSTLAILIKH EKLNSTIRDE ARSLYRKLPG ISTLHLTPQH FSYLNGGKNT R YYKFVISV CKFIVNNSIP GQNKGHYRFY DFERNEKEMS LLYQKFLYEF CRRELTSANT TRSYLKWDAS SISDQSLNLL PR METDITI RSSEKILIVD AKYYKSIFSR RMGTEKFHSQ NLYQLMNYLW SLKPENGENI GGLLIYPHVD TAVKHRYKIN GFD IGLCTV NLGQEWPCIH QELLDIFDEY LK

UniProtKB: Type IV methyl-directed restriction enzyme EcoKMcrBC

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Macromolecule #3: GUANOSINE-5'-DIPHOSPHATE

MacromoleculeName: GUANOSINE-5'-DIPHOSPHATE / type: ligand / ID: 3 / Number of copies: 1 / Formula: GDP
Molecular weightTheoretical: 443.201 Da
Chemical component information

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM

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Macromolecule #4: 5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE

MacromoleculeName: 5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE / type: ligand / ID: 4 / Number of copies: 5 / Formula: GSP
Molecular weightTheoretical: 539.246 Da
Chemical component information

ChemComp-GSP:
5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE

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Macromolecule #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 4 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration16.0 mg/mL
BufferpH: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-40 / Number grids imaged: 1 / Number real images: 1161 / Average exposure time: 20.0 sec. / Average electron dose: 4.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.28 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0.6) / Number images used: 106684
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final 3D classificationNumber classes: 3 / Software - Name: cryoSPARC (ver. 2.4.0)
FSC plot (resolution estimation)

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