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- EMDB-60326: Cryo-EM structure of origin recognition complex (Orc1 to 5) with ... -

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Basic information

Entry
Database: EMDB / ID: EMD-60326
TitleCryo-EM structure of origin recognition complex (Orc1 to 5) with ARS1 DNA bound
Map data
Sample
  • Complex: ARS1 bound origin recognition complex without Orc6
    • Protein or peptide: Origin recognition complex subunit 1
    • Protein or peptide: Origin recognition complex subunit 2
    • Protein or peptide: Origin recognition complex subunit 3
    • Protein or peptide: Origin recognition complex subunit 4
    • DNA: DNA (31-MER)
    • DNA: DNA (31-MER)
    • Protein or peptide: Origin recognition complex subunit 5
  • Ligand: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
  • Ligand: MAGNESIUM ION
Keywordsorigin recognition complex / REPLICATION
Function / homology
Function and homology information


CDC6 association with the ORC:origin complex / Cul8-RING ubiquitin ligase complex / maintenance of rDNA / Assembly of the ORC complex at the origin of replication / nuclear origin of replication recognition complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / nucleosome organization / nuclear pre-replicative complex / Activation of ATR in response to replication stress ...CDC6 association with the ORC:origin complex / Cul8-RING ubiquitin ligase complex / maintenance of rDNA / Assembly of the ORC complex at the origin of replication / nuclear origin of replication recognition complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / Activation of the pre-replicative complex / nucleosome organization / nuclear pre-replicative complex / Activation of ATR in response to replication stress / DNA replication preinitiation complex / mitotic DNA replication checkpoint signaling / silent mating-type cassette heterochromatin formation / Orc1 removal from chromatin / regulation of DNA replication / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / nucleosome binding / chromosome, telomeric region / chromatin binding / ATP hydrolysis activity / nucleoplasm / ATP binding / nucleus / metal ion binding
Similarity search - Function
: / Origin recognition complex subunit 1 C-terminal winged HTH domain / Origin recognition complex subunit 4 / Origin recognition complex, subunit 3 / Origin recognition complex, subunit 5 / Origin recognition complex subunit 4, C-terminal / Origin recognition complex subunit 3, winged helix C-terminal / Origin recognition complex subunit 3, N-terminal / : / : ...: / Origin recognition complex subunit 1 C-terminal winged HTH domain / Origin recognition complex subunit 4 / Origin recognition complex, subunit 3 / Origin recognition complex, subunit 5 / Origin recognition complex subunit 4, C-terminal / Origin recognition complex subunit 3, winged helix C-terminal / Origin recognition complex subunit 3, N-terminal / : / : / Origin recognition complex (ORC) subunit 3 N-terminus / Origin recognition complex (ORC) subunit 4 C-terminus / Origin recognition complex (ORC) subunit 5 C-terminus / Origin recognition complex winged helix C-terminal / ORC5, lid domain / Orc1-like, AAA ATPase domain / Origin recognition complex subunit 2 RecA-like domain / AAA ATPase domain / Origin recognition complex, subunit 2 / AAA lid domain / AAA lid domain / : / Bromo adjacent homology domain / BAH domain / Bromo adjacent homology (BAH) domain / Bromo adjacent homology (BAH) domain superfamily / BAH domain profile. / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / EF-Hand 1, calcium-binding site / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Origin recognition complex subunit 2 / Origin recognition complex subunit 5 / Origin recognition complex subunit 1 / Origin recognition complex subunit 3 / Origin recognition complex subunit 4
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast) / Saccharomyces cerevisiae S288C (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.33 Å
AuthorsLam WH / Yu D / Dang S / Zhai Y
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: DNA bending mediated by ORC is essential for replication licensing in budding yeast.
Authors: Wai Hei Lam / Daqi Yu / Qiongdan Zhang / Yuhan Lin / Ningning Li / Jian Li / Yue Wu / Yingyi Zhang / Ning Gao / Bik Kwoon Tye / Yuanliang Zhai / Shangyu Dang /
Abstract: In eukaryotes, the origin recognition complex (ORC) promotes the assembly of minichromosome maintenance 2 to 7 complexes into a head-to-head double hexamer at origin DNA in a process known as ...In eukaryotes, the origin recognition complex (ORC) promotes the assembly of minichromosome maintenance 2 to 7 complexes into a head-to-head double hexamer at origin DNA in a process known as replication licensing. In this study, we present a series of cryoelectron microscopy structures of yeast ORC mutants in complex with origin DNA. We show that Orc6, the smallest subunit of ORC, utilizes its transcription factor II B-B domain to orchestrate the sequential binding of ORC to origin DNA. In addition, Orc6 plays the role of a scaffold by stabilizing the basic patch (BP) of Orc5 for ORC to capture and bend origin DNA. Importantly, disrupting DNA bending through mutating three key residues in Orc5-BP impairs ORC's ability to promote replication initiation at two points during the pre-RC assembly process. This study dissects the multifaceted role of Orc6 in orchestrating ORC's activities on DNA and underscores the vital role of DNA bending by ORC in replication licensing.
History
DepositionMay 29, 2024-
Header (metadata) releaseApr 16, 2025-
Map releaseApr 16, 2025-
UpdateApr 16, 2025-
Current statusApr 16, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_60326.png

Downloads & links

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Map

FileDownload / File: emd_60326.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 320 pix.
= 339.2 Å		1.06 Å/pix.
x 320 pix.
= 339.2 Å		1.06 Å/pix.
x 320 pix.
= 339.2 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-0.4735642 - 1.2480518
Average (Standard dev.)0.0022774846 (±0.035673376)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 339.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_60326_msk_1.map
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Additional map: #1

Fileemd_60326_additional_1.map
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Half map: #1

Fileemd_60326_half_map_1.map
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Half map: #2

Fileemd_60326_half_map_2.map
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Sample components

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Entire : ARS1 bound origin recognition complex without Orc6

EntireName: ARS1 bound origin recognition complex without Orc6
Components
  • Complex: ARS1 bound origin recognition complex without Orc6
    • Protein or peptide: Origin recognition complex subunit 1
    • Protein or peptide: Origin recognition complex subunit 2
    • Protein or peptide: Origin recognition complex subunit 3
    • Protein or peptide: Origin recognition complex subunit 4
    • DNA: DNA (31-MER)
    • DNA: DNA (31-MER)
    • Protein or peptide: Origin recognition complex subunit 5
  • Ligand: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
  • Ligand: MAGNESIUM ION

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Supramolecule #1: ARS1 bound origin recognition complex without Orc6

SupramoleculeName: ARS1 bound origin recognition complex without Orc6 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast) / Strain: S288c
Molecular weightTheoretical: 370 KDa

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Macromolecule #1: Origin recognition complex subunit 1

MacromoleculeName: Origin recognition complex subunit 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast) / Strain: S288C
Molecular weightTheoretical: 104.546164 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MAKTLKDLQG WEIITTDEQG NIIDGGQKRL RRRGAKTEHY LKRSSDGIKL GRGDSVVMHN EAAGTYSVYM IQELRLNTLN NVVELWALT YLRWFEVNPL AHYRQFNPDA NILNRPLNYY NKLFSETANK NELYLTAELA ELQLFNFIRV ANVMDGSKWE V LKGNVDPE ...String:
MAKTLKDLQG WEIITTDEQG NIIDGGQKRL RRRGAKTEHY LKRSSDGIKL GRGDSVVMHN EAAGTYSVYM IQELRLNTLN NVVELWALT YLRWFEVNPL AHYRQFNPDA NILNRPLNYY NKLFSETANK NELYLTAELA ELQLFNFIRV ANVMDGSKWE V LKGNVDPE RDFTVRYICE PTGEKFVDIN IEDVKAYIKK VEPREAQEYL KDLTLPSKKK EIKRGPQKKD KATQTAQISD AE TRATDIT DNEDGNEDES SDYESPSDID VSEDMDSGEI SADELEEEED EEEDEDEEEK EARHTNSPRK RGRKIKLGKD DID ASVQPP PKKRGRKPKD PSKPRQMLLI SSCRANNTPV IRKFTKKNVA RAKKKYTPFS KRFKSIAAIP DLTSLPEFYG NSSE LMASR FENKLKTTQK HQIVETIFSK VKKQLNSSYV KEEILKSANF QDYLPARENE FASIYLSAYS AIESDSATTI YVAGT PGVG KTLTVREVVK ELLSSSAQRE IPDFLYVEIN GLKMVKPTDC YETLWNKVSG ERLTWAASME SLEFYFKRVP KNKKKT IVV LLDELDAMVT KSQDIMYNFF NWTTYENAKL IVIAVANTMD LPERQLGNKI TSRIGFTRIM FTGYTHEELK NIIDLRL KG LNDSFFYVDT KTGNAILIDA AGNDTTVKQT LPEDVRKVRL RMSADAIEIA SRKVASVSGD ARRALKVCKR AAEIAEKH Y MAKHGYGYDG KTVIEDENEE QIYDDEDKDL IESNKAKDDN DDDDDNDGVQ TVHITHVMKA LNETLNSHVI TFMTRLSFT AKLFIYALLN LMKKNGSQEQ ELGDIVDEIK LLIEVNGSNK FVMEIAKTLF QQGSDNISEQ LRIISWDFVL NQLLDAGILF KQTMKNDRI CCVKLNISVE EAKRAMNEDE TLRNL

UniProtKB: Origin recognition complex subunit 1

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Macromolecule #2: Origin recognition complex subunit 2

MacromoleculeName: Origin recognition complex subunit 2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast) / Strain: S288C
Molecular weightTheoretical: 71.34218 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MLNGEDFVEH NDILSSPAKS RNVTPKRVDP HGERQLRRIH SSKKNLLERI SLVGNERKNT SPDPALKPKT PSKAPRKRGR PRKIQEELT DRIKKDEKDT ISSKKKRKLD KDTSGNVNEE SKTSNNKQVM EKTGIKEKRE REKIQVATTT YEDNVTPQTD D NFVSNSPE ...String:
MLNGEDFVEH NDILSSPAKS RNVTPKRVDP HGERQLRRIH SSKKNLLERI SLVGNERKNT SPDPALKPKT PSKAPRKRGR PRKIQEELT DRIKKDEKDT ISSKKKRKLD KDTSGNVNEE SKTSNNKQVM EKTGIKEKRE REKIQVATTT YEDNVTPQTD D NFVSNSPE PPEPATPSKK SLTTNHDFTS PLKQIIMNNL KEYKDSTSPG KLTLSRNFTP TPVPKNKKLY QTSETKSASS FL DTFEGYF DQRKIVRTNA KSRHTMSMAP DVTREEFSLV SNFFNENFQK RPRQKLFEIQ KKMFPQYWFE LTQGFSLLFY GVG SKRNFL EEFAIDYLSP KIAYSQLAYE NELQQNKPVN SIPCLILNGY NPSCNYRDVF KEITDLLVPA ELTRSETKYW GNHV ILQIQ KMIDFYKNQP LDIKLILVVH NLDGPSIRKN TFQTMLSFLS VIRQIAIVAS TDHIYAPLLW DNMKAQNYNF VFHDI SNFE PSTVESTFQD VMKMGKSDTS SGAEGAKYVL QSLTVNSKKM YKLLIETQMQ NMGNLSANTG PKRGTQRTGV ELKLFN HLC AADFIASNEI ALRSMLREFI EHKMANITKN NSGMEIIWVP YTYAELEKLL KTVLNTL

UniProtKB: Origin recognition complex subunit 2

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Macromolecule #3: Origin recognition complex subunit 3

MacromoleculeName: Origin recognition complex subunit 3 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast) / Strain: S288C
Molecular weightTheoretical: 72.161766 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MSDLNQSKKM NVSEFADAQR SHYTVYPSLP QSNKNDKHIP FVKLLSGKES EVNVEKRWEL YHQLHSHFHD QVDHIIDNIE ADLKAEISD LLYSETTQKR RCFNTIFLLG SDSTTKIELK DESSRYNVLI ELTPKESPNV RMMLRRSMYK LYSAADAEEH P TIKYEDIN ...String:
MSDLNQSKKM NVSEFADAQR SHYTVYPSLP QSNKNDKHIP FVKLLSGKES EVNVEKRWEL YHQLHSHFHD QVDHIIDNIE ADLKAEISD LLYSETTQKR RCFNTIFLLG SDSTTKIELK DESSRYNVLI ELTPKESPNV RMMLRRSMYK LYSAADAEEH P TIKYEDIN DEDGDFTEQN NDVSYDLSLV ENFKRLFGKD LAMVFNFKDV DSINFNTLDN FIILLKSAFK YDHVKISLIF NI NTNLSNI EKNLRQSTIR LLKRNYHKLD VSSNKGFKYG NQIFQSFLDT VDGKLNLSDR FVEFILSKMA NNTNHNLQLL TKM LDYSLM SYFFQNAFSV FIDPVNVDFL NDDYLKILSR CPTFMFFVEG LIKQHAPADE ILSLLTNKNR GLEEFFVEFL VREN PINGH AKFVARFLEE ELNITNFNLI ELYHNLLIGK LDSYLDRWSA CKEYKDRLHF EPIDTIFQEL FTLDNRSGLL TQSIF PSYK SNIEDNLLSW EQVLPSLDKE NYDTLSGDLD KIMAPVLGQL FKLYREANMT INIYDFYIAF RETLPKEEIL NFIRKD PSN TKLLELAETP DAFDKVALIL FMQAIFAFEN MGLIKFQSTK SYDLVEKCVW RGI

UniProtKB: Origin recognition complex subunit 3

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Macromolecule #4: Origin recognition complex subunit 4

MacromoleculeName: Origin recognition complex subunit 4 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast) / Strain: S288C
Molecular weightTheoretical: 60.772152 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MTISEARLSP QVNLLPIKRH SNEEVEETAA ILKKRTIDNE KCKDSDPGFG SLQRRLLQQL YGTLPTDEKI IFTYLQDCQQ EIDRIIKQS IIQKESHSVI LVGPRQSYKT YLLDYELSLL QQSYKEQFIT IRLNGFIHSE QTAINGIATQ LEQQLQKIHG S EEKIDDTS ...String:
MTISEARLSP QVNLLPIKRH SNEEVEETAA ILKKRTIDNE KCKDSDPGFG SLQRRLLQQL YGTLPTDEKI IFTYLQDCQQ EIDRIIKQS IIQKESHSVI LVGPRQSYKT YLLDYELSLL QQSYKEQFIT IRLNGFIHSE QTAINGIATQ LEQQLQKIHG S EEKIDDTS LETISSGSLT EVFEKILLLL DSTTKTRNED SGEVDRESIT KITVVFIFDE IDTFAGPVRQ TLLYNLFDMV EH SRVPVCI FGCTTKLNIL EYLEKRVKSR FSQRVIYMPQ IQNLDDMVDA VRNLLTVRSE ISPWVSQWNE TLEKELSDPR SNL NRHIRM NFETFRSLPT LKNSIIPLVA TSKNFGSLCT AIKSCSFLDI YNKNQLSNNL TGRLQSLSDL ELAILISAAR VALR AKDGS FNFNLAYAEY EKMIKAINSR IPTVAPTTNV GTGQSTFSID NTIKLWLKKD VKNVWENLVQ LDFFTEKSAV GLRDN ATAA FYASNYQFQG TMIPFDLRSY QMQIILQELR RIIPKSNMYY SWTQL

UniProtKB: Origin recognition complex subunit 4

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Macromolecule #7: Origin recognition complex subunit 5

MacromoleculeName: Origin recognition complex subunit 5 / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast) / Strain: S288C
Molecular weightTheoretical: 55.347168 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MNVTTPEVAF REYQTNCLAS YISADPDITP SNLILQGYSG TGKTYTLKKY FNANPNLHAV WLEPVELVSW KPLLQAIART VQYKLKTLY PNIPTTDYDP LQVEEPFLLV KTLHNIFVQY ESLQEKTCLF LILDGFDSLQ DLDAALFNKY IKLNELLPKD S KINIKFIY ...String:
MNVTTPEVAF REYQTNCLAS YISADPDITP SNLILQGYSG TGKTYTLKKY FNANPNLHAV WLEPVELVSW KPLLQAIART VQYKLKTLY PNIPTTDYDP LQVEEPFLLV KTLHNIFVQY ESLQEKTCLF LILDGFDSLQ DLDAALFNKY IKLNELLPKD S KINIKFIY TMLETSFLQR YSTHCIPTVM FPRYNVDEVS TILVMSRCGE LMEDSCLRKR IIEEQITDCT DDQFQNVAAN FI HLIVQAF HSYTGNDIFA LNDLIDFKWP KYVSRITKEN IFEPLALYKS AIKLFLSTDD NLSENGQGES AITTNRDDLE NSQ TYDLSI ISKYLLIASY ICSYLEPRYD ASIFSRKTRI IQGRAAYGRR KKKEVNPRYL QPSLFAIERL LAIFQAIFPI QGKA ESGSL SALREESLMK ANIEVFQNLS ELHTLKLIAT TMNKNIDYLS PKVRWKVNVP WEIIKEISES VHFNISDYFS DIHE

UniProtKB: Origin recognition complex subunit 5

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Macromolecule #5: DNA (31-MER)

MacromoleculeName: DNA (31-MER) / type: dna / ID: 5 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 23.708256 KDa
SequenceString: (DT)(DA)(DC)(DA)(DG)(DA)(DT)(DT)(DT)(DT) (DA)(DT)(DG)(DT)(DT)(DT)(DA)(DG)(DA)(DT) (DC)(DT)(DT)(DT)(DT)(DA)(DT)(DG)(DC) (DT)(DT)(DG)(DC)(DT)(DT)(DT)(DT)(DC)(DA) (DA) (DA)(DA)(DG)(DG)(DC)(DC) ...String:
(DT)(DA)(DC)(DA)(DG)(DA)(DT)(DT)(DT)(DT) (DA)(DT)(DG)(DT)(DT)(DT)(DA)(DG)(DA)(DT) (DC)(DT)(DT)(DT)(DT)(DA)(DT)(DG)(DC) (DT)(DT)(DG)(DC)(DT)(DT)(DT)(DT)(DC)(DA) (DA) (DA)(DA)(DG)(DG)(DC)(DC)(DT)(DG) (DC)(DA)(DG)(DG)(DC)(DA)(DA)(DG)(DT)(DG) (DC)(DA) (DC)(DA)(DA)(DA)(DC)(DA)(DA) (DT)(DA)(DC)(DT)(DT)(DA)(DA)(DA)(DT)(DA)

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Macromolecule #6: DNA (31-MER)

MacromoleculeName: DNA (31-MER) / type: dna / ID: 6 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 23.766305 KDa
SequenceString: (DT)(DA)(DT)(DT)(DT)(DA)(DA)(DG)(DT)(DA) (DT)(DT)(DG)(DT)(DT)(DT)(DG)(DT)(DG)(DC) (DA)(DC)(DT)(DT)(DG)(DC)(DC)(DT)(DG) (DC)(DA)(DG)(DG)(DC)(DC)(DT)(DT)(DT)(DT) (DG) (DA)(DA)(DA)(DA)(DG)(DC) ...String:
(DT)(DA)(DT)(DT)(DT)(DA)(DA)(DG)(DT)(DA) (DT)(DT)(DG)(DT)(DT)(DT)(DG)(DT)(DG)(DC) (DA)(DC)(DT)(DT)(DG)(DC)(DC)(DT)(DG) (DC)(DA)(DG)(DG)(DC)(DC)(DT)(DT)(DT)(DT) (DG) (DA)(DA)(DA)(DA)(DG)(DC)(DA)(DA) (DG)(DC)(DA)(DT)(DA)(DA)(DA)(DA)(DG)(DA) (DT)(DC) (DT)(DA)(DA)(DA)(DC)(DA)(DT) (DA)(DA)(DA)(DA)(DT)(DC)(DT)(DG)(DT)(DA)

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Macromolecule #8: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER

MacromoleculeName: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / type: ligand / ID: 8 / Number of copies: 3 / Formula: AGS
Molecular weightTheoretical: 523.247 Da
Chemical component information

ChemComp-AGS:
PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-gamma-S, energy-carrying molecule analogue*YM

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Macromolecule #9: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 9 / Number of copies: 3 / 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

BufferpH: 7.5
Component:
ConcentrationFormulaName
100.0 mMKOAcpotassium acetate
25.0 mMHEPES-KOHHEPES-KOH
5.0 mMMgOAc2magnesium acetate
1.0 mMbeta-mercaptoethanolbeta-mercaptoethanol
GridModel: C-flat-1.2/1.3 / Material: GOLD / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
SoftwareName: EPU (ver. 2.12)
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 48.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Calibrated defocus max: 2.5 µm / Calibrated defocus min: 1.0 µm / Calibrated magnification: 47170 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 81000
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

Particle selectionNumber selected: 223993
Startup modelType of model: INSILICO MODEL
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.33 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.3.2) / Number images used: 80078
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)
Final 3D classificationNumber classes: 3 / Avg.num./class: 44574 / Software - Name: cryoSPARC (ver. 3.3.2)
FSC plot (resolution estimation)

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Atomic model buiding 1

SoftwareName: UCSF Chimera (ver. 1.13.1)
RefinementProtocol: RIGID BODY FIT
Output model

PDB-8zp4:
Cryo-EM structure of origin recognition complex (Orc1 to 5) with ARS1 DNA bound

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