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- EMDB-43096: Structure of the E. coli clamp loader bound to the beta clamp in ... -

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Basic information

Entry
Database: EMDB / ID: EMD-43096
TitleStructure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation
Map data
Sample
  • Complex: Structure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation
    • Protein or peptide: DNA polymerase III subunit deltaDNA polymerase III holoenzyme
    • Protein or peptide: DNA polymerase III subunit tauDNA polymerase III holoenzyme
    • Protein or peptide: DNA polymerase III subunit delta'DNA polymerase III holoenzyme
    • Protein or peptide: Beta sliding clamp
KeywordsBacterial Clamp Loader Complex / REPLICATION / TRANSFERASE
Function / homology
Function and homology information


DNA polymerase III, clamp loader complex / DNA polymerase III complex / replisome / DNA polymerase processivity factor activity / 3'-5' exonuclease activity / ribonucleoside triphosphate phosphatase activity / DNA-templated DNA replication / DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity ...DNA polymerase III, clamp loader complex / DNA polymerase III complex / replisome / DNA polymerase processivity factor activity / 3'-5' exonuclease activity / ribonucleoside triphosphate phosphatase activity / DNA-templated DNA replication / DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / ATP hydrolysis activity / DNA binding / ATP binding / identical protein binding / cytoplasm
Similarity search - Function
DNA polymerase III, delta prime subunit / DNA polymerase III, delta subunit, C-terminal / : / DNA polymerase III, delta subunit, C terminal / DNA polymerase III subunit delta', AAA+ ATPase lid domain / DNA polymerase III subunit delta, C-terminal / Processivity clamp loader gamma complex DNA pol III C-term / DNA polymerase III, delta subunit / DNA polymerase III delta, N-terminal / DNA polymerase III, delta subunit ...DNA polymerase III, delta prime subunit / DNA polymerase III, delta subunit, C-terminal / : / DNA polymerase III, delta subunit, C terminal / DNA polymerase III subunit delta', AAA+ ATPase lid domain / DNA polymerase III subunit delta, C-terminal / Processivity clamp loader gamma complex DNA pol III C-term / DNA polymerase III, delta subunit / DNA polymerase III delta, N-terminal / DNA polymerase III, delta subunit / DNA polymerase III, tau subunit, domain V / DNA polymerase III subunit tau, DnaB-binding domain IV / DNA polymerase III, tau subunit, domain V superfamily / DNA polymerase III, subunit gamma/tau, helical lid domain / DNA polymerase III subunits tau domain IV DnaB-binding / DNA polymerase III tau subunit V interacting with alpha / DNA polymerase III, subunit gamma/ tau, N-terminal / DNA polymerase III, gamma subunit, domain III / DNA polymerase III subunits gamma and tau domain III / DNA polymerase III, delta subunit / DNA polymerase III, beta sliding clamp / DNA polymerase III, beta sliding clamp, N-terminal / DNA polymerase III, beta sliding clamp, C-terminal / DNA polymerase III, beta sliding clamp, central / DNA polymerase III beta subunit, N-terminal domain / DNA polymerase III beta subunit, central domain / DNA polymerase III beta subunit, C-terminal domain / DNA polymerase III beta subunit / DNA polymerase III, clamp loader complex, gamma/delta/delta subunit, C-terminal / ClpA/B family / : / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Beta sliding clamp / DNA polymerase III subunit tau / DNA polymerase III subunit delta / DNA polymerase III subunit delta'
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.7 Å
AuthorsLandeck JT / Pajak J / Kelch BA
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM127776 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM145943 United States
American Cancer SocietyPF-22-114-01-DMC United States
CitationJournal: J Biol Chem / Year: 2024
Title: Differences between bacteria and eukaryotes in clamp loader mechanism, a conserved process underlying DNA replication.
Authors: Jacob T Landeck / Joshua Pajak / Emily K Norman / Emma L Sedivy / Brian A Kelch /
Abstract: Clamp loaders are pentameric ATPases that place circular sliding clamps onto DNA, where they function in DNA replication and genome integrity. The central activity of a clamp loader is the opening of ...Clamp loaders are pentameric ATPases that place circular sliding clamps onto DNA, where they function in DNA replication and genome integrity. The central activity of a clamp loader is the opening of the ring-shaped sliding clamp and the subsequent binding to primer-template (p/t)-junctions. The general architecture of clamp loaders is conserved across all life, suggesting that their mechanism is retained. Recent structural studies of the eukaryotic clamp loader replication factor C (RFC) revealed that it functions using a crab-claw mechanism, where clamp opening is coupled to a massive conformational change in the loader. Here we investigate the clamp loading mechanism of the Escherichia coli clamp loader at high resolution using cryo-electron microscopy. We find that the E. coli clamp loader opens the clamp using a crab-claw motion at a single pivot point, whereas the eukaryotic RFC loader uses motions distributed across the complex. Furthermore, we find clamp opening occurs in multiple steps, starting with a partly open state with a spiral conformation, and proceeding to a wide open clamp in a surprising planar geometry. Finally, our structures in the presence of p/t-junctions illustrate how the clamp closes around p/t-junctions and how the clamp loader initiates release from the loaded clamp. Our results reveal mechanistic distinctions in a macromolecular machine that is conserved across all domains of life.
History
DepositionDec 11, 2023-
Header (metadata) releaseMar 27, 2024-
Map releaseMar 27, 2024-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43096.png

Downloads & links

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Map

FileDownload / File: emd_43096.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.87 Å
Density
Contour LevelBy AUTHOR: 0.33
Minimum - Maximum-0.23819323 - 1.0496606
Average (Standard dev.)0.00765043 (±0.08401068)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 261.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_43096_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_43096_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Structure of the E. coli clamp loader bound to the beta clamp in ...

EntireName: Structure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation
Components
  • Complex: Structure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation
    • Protein or peptide: DNA polymerase III subunit deltaDNA polymerase III holoenzyme
    • Protein or peptide: DNA polymerase III subunit tauDNA polymerase III holoenzyme
    • Protein or peptide: DNA polymerase III subunit delta'DNA polymerase III holoenzyme
    • Protein or peptide: Beta sliding clamp

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Supramolecule #1: Structure of the E. coli clamp loader bound to the beta clamp in ...

SupramoleculeName: Structure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: DNA polymerase III subunit delta

MacromoleculeName: DNA polymerase III subunit delta / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 38.745574 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: MIRLYPEQLR AQLNEGLRAA YLLLGNDPLL LQESQDAVRQ VAAAQGFEEH HTFSIDPNTD WNAIFSLCQA MSLFASRQTL LLLLPENGP NAAINEQLLT LTGLLHDDLL LIVRGNKLSK AQENAAWFTA LANRSVQVTC QTPEQAQLPR WVAARAKQLN L ELDDAANQ ...String:
MIRLYPEQLR AQLNEGLRAA YLLLGNDPLL LQESQDAVRQ VAAAQGFEEH HTFSIDPNTD WNAIFSLCQA MSLFASRQTL LLLLPENGP NAAINEQLLT LTGLLHDDLL LIVRGNKLSK AQENAAWFTA LANRSVQVTC QTPEQAQLPR WVAARAKQLN L ELDDAANQ VLCYCYEGNL LALAQALERL SLLWPDGKLT LPRVEQAVND AAHFTPFHWV DALLMGKSKR ALHILQQLRL EG SEPVILL RTLQRELLLL VNLKRQSAHT PLRALFDKHR VWQNRRGMMG EALNRLSQTQ LRQAVQLLTR TELTLKQDYG QSV WAELEG LSLLLCHKPL ADVFIDG

UniProtKB: DNA polymerase III subunit delta

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Macromolecule #2: DNA polymerase III subunit tau

MacromoleculeName: DNA polymerase III subunit tau / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO / EC number: DNA-directed DNA polymerase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 41.803168 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: GPHMSYQVLA RKWRPQTFAD VVGQEHVLTA LANGLSLGRI HHAYLFSGTR GVGKTSIARL LAKGLNCETG ITATPCGVCD NCREIEQGR FVDLIEIDAA SRTKVEDTRD LLDNVQYAPA RGRFKVYLID EVHMLSRHSF NALLKTLEEP PEHVKFLLAT T DPQKLPVT ...String:
GPHMSYQVLA RKWRPQTFAD VVGQEHVLTA LANGLSLGRI HHAYLFSGTR GVGKTSIARL LAKGLNCETG ITATPCGVCD NCREIEQGR FVDLIEIDAA SRTKVEDTRD LLDNVQYAPA RGRFKVYLID EVHMLSRHSF NALLKTLEEP PEHVKFLLAT T DPQKLPVT ILSRCLQFHL KALDVEQIRH QLEHILNEEH IAHEPRALQL LARAAEGSLR DALSLTDQAI ASGDGQVSTQ AV SAMLGTL DDDQALSLVE AMVEANGERV MALINEAAAR GIEWEALLVE MLGLLHRIAM VQLSPAALGN DMAAIELRMR ELA RTIPPT DIQLYYQTLL IGRKELPYAP DRRMGVEMTL LRALAFHPRM PLPEPEVPRQ

UniProtKB: DNA polymerase III subunit tau

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Macromolecule #3: DNA polymerase III subunit delta'

MacromoleculeName: DNA polymerase III subunit delta' / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 37.272801 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: GPHMRWYPWL RPDFEKLVAS YQAGRGHHAL LIQALPGMGD DALIYALSRY LLCQQPQGHK SCGHCRGCQL MQAGTHPDYY TLAPEKGKN TLGVDAVREV TEKLNEHARL GGAKVVWVTD AALLTDAAAN ALLKTLEEPP AETWFFLATR EPERLLATLR S RCRLHYLA ...String:
GPHMRWYPWL RPDFEKLVAS YQAGRGHHAL LIQALPGMGD DALIYALSRY LLCQQPQGHK SCGHCRGCQL MQAGTHPDYY TLAPEKGKN TLGVDAVREV TEKLNEHARL GGAKVVWVTD AALLTDAAAN ALLKTLEEPP AETWFFLATR EPERLLATLR S RCRLHYLA PPPEQYAVTW LSREVTMSQD ALLAALRLSA GSPGAALALF QGDNWQARET LCQALAYSVP SGDWYSLLAA LN HEQAPAR LHWLATLLMD ALKRHHGAAQ VTNVDVPGLV AELANHLSPS RLQAILGDVC HIREQLMSVT GINRELLITD LLL RIEHYL QPGVVLPVPH L

UniProtKB: DNA polymerase III subunit delta'

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Macromolecule #4: Beta sliding clamp

MacromoleculeName: Beta sliding clamp / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 40.922816 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: GPHMKFTVER EHLLKPLQQV SGPLGGRPTL PILGNLLLQV ADGTLSLTGT DLEMEMVARV ALVQPHEPGA TTVPARKFFD ICRGLPEGA EIAVQLEGER MLVRSGRSRF SLSTLPAADF PNLDDWQSEV EFTLPQATMK RLIEATQFSM AHQDVRYYLN G MLFETEGE ...String:
GPHMKFTVER EHLLKPLQQV SGPLGGRPTL PILGNLLLQV ADGTLSLTGT DLEMEMVARV ALVQPHEPGA TTVPARKFFD ICRGLPEGA EIAVQLEGER MLVRSGRSRF SLSTLPAADF PNLDDWQSEV EFTLPQATMK RLIEATQFSM AHQDVRYYLN G MLFETEGE ELRTVATDGH RLAVCSMPIG QSLPSHSVIV PRKGVIELMR MLDGGDNPLR VQIGSNNIRA HVGDFIFTSK LV DGRFPDY RRVLPKNPDK HLEAGCDLLK QAFARAAILS NEKFRGVRLY VSENQLKITA NNPEQEEAEE ILDVTYSGAE MEI GFNVSY VLDVLNALKC ENVRMMLTDS VSSVQIEDAA SQSAAYVVMP MRL

UniProtKB: Beta sliding clamp

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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

BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 283.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 1.1 µm
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 3664 / Average electron dose: 42.8 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 424836
Startup modelType of model: INSILICO MODEL / In silico model: Generate an ab-initio model in cryoSPARC
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 7.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 44484
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

3glf

source_name: PDB, initial_model_type: experimental model

2pol

source_name: PDB, initial_model_type: experimental model
RefinementOverall B value: 622.7
Output model

PDB-8van:
Structure of the E. coli clamp loader bound to the beta clamp in an Initial-Binding conformation

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