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- EMDB-19187: Cryo-EM structure of an MCM helicase single hexamer loaded onto dsDNA. -

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Basic information

Entry
Database: EMDB / ID: EMD-19187
TitleCryo-EM structure of an MCM helicase single hexamer loaded onto dsDNA.
Map dataPrimary map from final 3D refinement in Relion.
Sample
  • Complex: Hexameric MCM helicase complex loaded onto duplex DNA
    • Protein or peptide: x 6 types
    • DNA: x 2 types
  • Ligand: x 4 types
KeywordsMCM helicase / DNA replication / REPLICATION
Function / homology
Function and homology information


MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / replication fork protection complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative complex ...MCM core complex / Assembly of the pre-replicative complex / Switching of origins to a post-replicative state / MCM complex binding / nuclear DNA replication / premeiotic DNA replication / replication fork protection complex / pre-replicative complex assembly involved in nuclear cell cycle DNA replication / mitotic DNA replication / Activation of the pre-replicative complex / CMG complex / nuclear pre-replicative complex / Activation of ATR in response to replication stress / DNA replication preinitiation complex / MCM complex / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / regulation of DNA-templated DNA replication initiation / silent mating-type cassette heterochromatin formation / DNA strand elongation involved in DNA replication / nuclear replication fork / DNA replication origin binding / DNA replication initiation / subtelomeric heterochromatin formation / DNA helicase activity / transcription elongation by RNA polymerase II / helicase activity / heterochromatin formation / single-stranded DNA binding / DNA helicase / chromosome, telomeric region / DNA replication / DNA damage response / chromatin binding / ATP hydrolysis activity / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytoplasm
Similarity search - Function
: / MCM3 winged helix domain / : / MCM5, C-terminal domain / DNA replication licensing factor MCM7, winged helix / DNA replication licensing factor Mcm5 / MCM4, winged helix domain / DNA replication licensing factor Mcm3 / Mini-chromosome maintenance complex protein 4 / : ...: / MCM3 winged helix domain / : / MCM5, C-terminal domain / DNA replication licensing factor MCM7, winged helix / DNA replication licensing factor Mcm5 / MCM4, winged helix domain / DNA replication licensing factor Mcm3 / Mini-chromosome maintenance complex protein 4 / : / MCM3-like, winged helix domain / DNA replication licensing factor Mcm6 / DNA replication licensing factor Mcm7 / Mcm6, C-terminal winged-helix domain / MCM6 C-terminal winged-helix domain / DNA replication licensing factor Mcm2 / Mini-chromosome maintenance protein 2 / Mini-chromosome maintenance, conserved site / MCM family signature. / MCM N-terminal domain / MCM N-terminal domain / MCM OB domain / MCM OB domain / Mini-chromosome maintenance protein / MCM, AAA-lid domain / MCM P-loop domain / MCM AAA-lid domain / MCM family domain profile. / minichromosome maintenance proteins / MCM domain / Winged helix-like DNA-binding domain superfamily / Nucleic acid-binding, OB-fold / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA replication licensing factor MCM3 / DNA replication licensing factor MCM2 / Minichromosome maintenance protein 5 / DNA replication licensing factor MCM4 / DNA replication licensing factor MCM7 / DNA replication licensing factor MCM6
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast) / Saccharomyces cerevisiae S288C (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.41 Å
AuthorsMiller TCR / Lim CT / Diffley JFX / Costa A
Funding support United Kingdom, European Union, Denmark, 6 items
OrganizationGrant numberCountry
Wellcome TrustFC001065 United Kingdom
Medical Research Council (MRC, United Kingdom)FC001065 United Kingdom
Cancer Research UKFC001065 United Kingdom
European Research Council (ERC)820102European Union
Novo Nordisk FoundationNNF22OC0073571 Denmark
Danish National Research FoundationDNRF115 Denmark
CitationJournal: Nat Struct Mol Biol / Year: 2025
Title: Cell cycle regulation has shaped replication origins in budding yeast.
Authors: Chew Theng Lim / Thomas C R Miller / Kang Wei Tan / Saurabh Talele / Anne Early / Philip East / Humberto Sánchez / Nynke H Dekker / Alessandro Costa / John F X Diffley /
Abstract: Eukaryotic DNA replication initiates from genomic loci known as origins. At budding yeast origins like ARS1, a double hexamer (DH) of the MCM replicative helicase is assembled by origin recognition ...Eukaryotic DNA replication initiates from genomic loci known as origins. At budding yeast origins like ARS1, a double hexamer (DH) of the MCM replicative helicase is assembled by origin recognition complex (ORC), Cdc6 and Cdt1 by sequential hexamer loading from two opposed ORC binding sites. Cyclin-dependent kinase (CDK) inhibits DH assembly, which prevents re-replication by restricting helicase loading to the G1 phase. Here, we show that an intrinsically disordered region (IDR) in the Orc2 subunit promotes interaction between ORC and the first loaded, closed-ring MCM hexamer (the MCM-ORC (MO) intermediate). CDK-dependent phosphorylation of this IDR blocks MO formation and DH assembly. We show that MO stabilizes ORC at lower-affinity binding sites required for second hexamer loading. Origins comprising two high-affinity ORC sites can assemble DH efficiently without MO by independently loading single hexamers. Strikingly, these origins escape CDK inhibition in vitro and in vivo. Our work reveals mechanistic plasticity in MCM loading with implications for understanding how CDK regulation has shaped yeast origin evolution and how natural, strong origins might escape cell cycle regulation. We also identify key steps common to loading pathways, with implications for understanding how MCM is loaded in other eukaryotes.
History
DepositionDec 18, 2023-
Header (metadata) releaseJan 1, 2025-
Map releaseJan 1, 2025-
UpdateJul 16, 2025-
Current statusJul 16, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_19187.png

Downloads & links

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Map

FileDownload / File: emd_19187.map.gz / Format: CCP4 / Size: 282.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPrimary map from final 3D refinement in Relion.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 420 pix.
= 453.6 Å		1.08 Å/pix.
x 420 pix.
= 453.6 Å		1.08 Å/pix.
x 420 pix.
= 453.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.011
Minimum - Maximum-0.008047034 - 0.033238158
Average (Standard dev.)0.000077157616 (±0.0009991468)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions420420420
Spacing420420420
CellA=B=C: 453.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_19187_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half-map 1 from final 3D refinement in Relion.

Fileemd_19187_half_map_1.map
AnnotationHalf-map 1 from final 3D refinement in Relion.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half-map 2 from final 3D refinement in Relion.

Fileemd_19187_half_map_2.map
AnnotationHalf-map 2 from final 3D refinement in Relion.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Hexameric MCM helicase complex loaded onto duplex DNA

EntireName: Hexameric MCM helicase complex loaded onto duplex DNA
Components
  • Complex: Hexameric MCM helicase complex loaded onto duplex DNA
    • Protein or peptide: DNA replication licensing factor MCM2
    • Protein or peptide: DNA replication licensing factor MCM3
    • Protein or peptide: DNA replication licensing factor MCM4
    • Protein or peptide: Minichromosome maintenance protein 5
    • Protein or peptide: DNA replication licensing factor MCM6
    • Protein or peptide: DNA replication licensing factor MCM7
    • DNA: DNA (5'-D(P*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*T)-3')
    • DNA: DNA (5'-D(P*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*T)-3')
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: ZINC ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE

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Supramolecule #1: Hexameric MCM helicase complex loaded onto duplex DNA

SupramoleculeName: Hexameric MCM helicase complex loaded onto duplex DNA / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#8
Details: Structural intermediate on path to MCM-double hexamer formation during the process of origin licensing.
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 610 KDa

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Macromolecule #1: DNA replication licensing factor MCM2

MacromoleculeName: DNA replication licensing factor MCM2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 98.911539 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MSDNRRRRRE EDDSDSENEL PPSSPQQHFR GGMNPVSSPI GSPDMINPEG DDNEVDDVPD IDEVEEQMNE VDLMDDNMYE DYAADHNRD RYDPDQVDDR EQQELSLSER RRIDAQLNER DRLLRNVAYI DDEDEEQEGA AQLDEMGLPV QRRRRRRQYE D LENSDDDL ...String:
MSDNRRRRRE EDDSDSENEL PPSSPQQHFR GGMNPVSSPI GSPDMINPEG DDNEVDDVPD IDEVEEQMNE VDLMDDNMYE DYAADHNRD RYDPDQVDDR EQQELSLSER RRIDAQLNER DRLLRNVAYI DDEDEEQEGA AQLDEMGLPV QRRRRRRQYE D LENSDDDL LSDMDIDPLR EELTLESLSN VKANSYSEWI TQPNVSRTIA RELKSFLLEY TDETGRSVYG ARIRTLGEMN SE SLEVNYR HLAESKAILA LFLAKCPEEM LKIFDLVAME ATELHYPDYA RIHSEIHVRI SDFPTIYSLR ELRESNLSSL VRV TGVVTR RTGVFPQLKY VKFNCLKCGS ILGPFFQDSN EEIRISFCTN CKSKGPFRVN GEKTVYRNYQ RVTLQEAPGT VPPG RLPRH REVILLADLV DVSKPGEEVE VTGIYKNNYD GNLNAKNGFP VFATIIEANS IKRREGNTAN EGEEGLDVFS WTEEE EREF RKISRDRGII DKIISSMAPS IYGHRDIKTA VACSLFGGVP KNVNGKHSIR GDINVLLLGD PGTAKSQILK YVEKTA HRA VFATGQGASA VGLTASVRKD PITKEWTLEG GALVLADKGV CLIDEFDKMN DQDRTSIHEA MEQQSISISK AGIVTTL QA RCSIIAAANP NGGRYNSTLP LAQNVSLTEP ILSRFDILCV VRDLVDEEAD ERLATFVVDS HVRSHPENDE DREGEELK N NGESAIEQGE DEINEQLNAR QRRLQRQRKK EEEISPIPQE LLMKYIHYAR TKIYPKLHQM DMDKVSRVYA DLRRESIST GSFPITVRHL ESILRIAESF AKMRLSEFVS SYDLDRAIKV VVDSFVDAQK VSVRRQLRRS FAIYTLGH

UniProtKB: DNA replication licensing factor MCM2

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Macromolecule #2: DNA replication licensing factor MCM3

MacromoleculeName: DNA replication licensing factor MCM3 / type: protein_or_peptide / ID: 2
Details: MCM3 contains a CBP-TEV tag at the N-terminus: KRRWKKNFIAVSAANRFKKISSSGALENLYFQG
Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 111.720242 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MKRRWKKNFI AVSAANRFKK ISSSGALENL YFQGEMEGST GFDGDATTFF APDAVFGDRV RRFQEFLDTF TSYRDSVRSI QVYNSNNAA NYNDDQDDAD ERDLLGDDDG DDLEKEKKAA SSTSLNILPH RIIISLDDLR EFDRSFWSGI LVEPAYFIPP A EKALTDLA ...String:
MKRRWKKNFI AVSAANRFKK ISSSGALENL YFQGEMEGST GFDGDATTFF APDAVFGDRV RRFQEFLDTF TSYRDSVRSI QVYNSNNAA NYNDDQDDAD ERDLLGDDDG DDLEKEKKAA SSTSLNILPH RIIISLDDLR EFDRSFWSGI LVEPAYFIPP A EKALTDLA DSMDDVPHPN ASAVSSRHPW KLSFKGSFGA HALSPRTLTA QHLNKLVSVE GIVTKTSLVR PKLIRSVHYA AK TGRFHYR DYTDATTTLT TRIPTPAIYP TEDTEGNKLT TEYGYSTFID HQRITVQEMP EMAPAGQLPR SIDVILDDDL VDK TKPGDR VNVVGVFKSL GAGGMNQSNS NTLIGFKTLI LGNTVYPLHA RSTGVAARQM LTDFDIRNIN KLSKKKDIFD ILSQ SLAPS IYGHDHIKKA ILLMLMGGVE KNLENGSHLR GDINILMVGD PSTAKSQLLR FVLNTASLAI ATTGRGSSGV GLTAA VTTD RETGERRLEA GAMVLADRGV VCIDEFDKMT DVDRVAIHEV MEQQTVTIAK AGIHTTLNAR CSVIAAANPV FGQYDV NRD PHQNIALPDS LLSRFDLLFV VTDDINEIRD RSISEHVLRT HRYLPPGYLE GEPVRERLNL SLAVGEDADI NPEEHSN SG AGVENEGEDD EDHVFEKFNP LLQAGAKLAK NKGNYNGTEI PKLVTIPFLR KYVQYAKERV IPQLTQEAIN VIVKNYTD L RNDDNTKKSP ITARTLETLI RLATAHAKVR LSKTVNKVDA KVAANLLRFA LLGEDIGNDI DEEESEYEEA LSKRSPQKS PKKRQRVRQP ASNSGSPIKS TPRRSTASSV NATPSSARRI LRFQDDEQNA GEDDNDIMSP LPADEEAELQ RRLQLGLRVS PRRREHLHA PEEGSSGPLT EVGTPRLPNV SSAGQDDEQQ QSVISFDNVE PGTISTGRLS LISGIIARLM QTEIFEEESY P VASLFERI NEELPEEEKF SAQEYLAGLK IMSDRNNLMV ADDKVWRV

UniProtKB: DNA replication licensing factor MCM3

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Macromolecule #3: DNA replication licensing factor MCM4

MacromoleculeName: DNA replication licensing factor MCM4 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 105.138375 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MSQQSSSPTK EDNNSSSPVV PNPDSVPPQL SSPALFYSSS SSQGDIYGRN NSQNLSQGEG NIRAAIGSSP LNFPSSSQRQ NSDVFQSQG RQGRIRSSAS ASGRSRYHSD LRSDRALPTS SSSLGRNGQN RVHMRRNDIH TSDLSSPRRI VDFDTRSGVN T LDTSSSSA ...String:
MSQQSSSPTK EDNNSSSPVV PNPDSVPPQL SSPALFYSSS SSQGDIYGRN NSQNLSQGEG NIRAAIGSSP LNFPSSSQRQ NSDVFQSQG RQGRIRSSAS ASGRSRYHSD LRSDRALPTS SSSLGRNGQN RVHMRRNDIH TSDLSSPRRI VDFDTRSGVN T LDTSSSSA PPSEASEPLR IIWGTNVSIQ ECTTNFRNFL MSFKYKFRKI LDEREEFINN TTDEELYYIK QLNEMRELGT SN LNLDARN LLAYKQTEDL YHQLLNYPQE VISIMDQTIK DCMVSLIVDN NLDYDLDEIE TKFYKVRPYN VGSCKGMREL NPN DIDKLI NLKGLVLRST PVIPDMKVAF FKCNVCDHTM AVEIDRGVIQ EPARCERIDC NEPNSMSLIH NRCSFADKQV IKLQ ETPDF VPDGQTPHSI SLCVYDELVD SCRAGDRIEV TGTFRSIPIR ANSRQRVLKS LYKTYVDVVH VKKVSDKRLD VDTST IEQE LMQNKVDHNE VEEVRQITDQ DLAKIREVAA REDLYSLLAR SIAPSIYELE DVKKGILLQL FGGTNKTFTK GGRYRG DIN ILLCGDPSTS KSQILQYVHK ITPRGVYTSG KGSSAVGLTA YITRDVDTKQ LVLESGALVL SDGGVCCIDE FDKMSDS TR SVLHEVMEQQ TISIAKAGII TTLNARSSIL ASANPIGSRY NPNLPVTENI DLPPPLLSRF DLVYLVLDKV DEKNDREL A KHLTNLYLED KPEHISQDDV LPVEFLTMYI SYAKEHIHPI ITEAAKTELV RAYVGMRKMG DDSRSDEKRI TATTRQLES MIRLAEAHAK MKLKNVVELE DVQEAVRLIR SAIKDYATDP KTGKIDMNLV QTGKSVIQRK LQEDLSREIM NVLKDQASDS MSFNELIKQ INEHSQDRVE SSDIQEALSR LQQEDKVIVL GEGVRRSVRL NNRV

UniProtKB: DNA replication licensing factor MCM4

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Macromolecule #4: Minichromosome maintenance protein 5

MacromoleculeName: Minichromosome maintenance protein 5 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 86.505734 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MSFDRPEIYS APVLQGESPN DDDNTEIIKS FKNFILEFRL DSQFIYRDQL RNNILVKNYS LTVNMEHLIG YNEDIYKKLS DEPSDIIPL FETAITQVAK RISILSRAQS ANNNDKDPEN TSMDTDSLLL NSLPTFQLIL NSNANQIPLR DLDSEHVSKI V RLSGIIIS ...String:
MSFDRPEIYS APVLQGESPN DDDNTEIIKS FKNFILEFRL DSQFIYRDQL RNNILVKNYS LTVNMEHLIG YNEDIYKKLS DEPSDIIPL FETAITQVAK RISILSRAQS ANNNDKDPEN TSMDTDSLLL NSLPTFQLIL NSNANQIPLR DLDSEHVSKI V RLSGIIIS TSVLSSRATY LSIMCRNCRH TTSITINNFN SITGNTVSLP RSCLSTIESE SSMANESNIG DESTKKNCGP DP YIIIHES SKFIDQQFLK LQEIPELVPV GEMPRNLTMT CDRYLTNKVI PGTRVTIVGI YSIYNSKNGA GSGRSGGGNG GSG VAIRTP YIKILGIQSD VETSSIWNSV TMFTEEEEEE FLQLSRNPKL YEILTNSIAP SIFGNEDIKK AIVCLLMGGS KKIL PDGMR LRGDINVLLL GDPGTAKSQL LKFVEKVSPI AVYTSGKGSS AAGLTASVQR DPMTREFYLE GGAMVLADGG VVCID EFDK MRDEDRVAIH EAMEQQTISI AKAGITTVLN SRTSVLAAAN PIYGRYDDLK SPGDNIDFQT TILSRFDMIF IVKDDH NEE RDISIANHVI NIHTGNANAM QNQQEENGSE ISIEKMKRYI TYCRLKCAPR LSPQAAEKLS SNFVTIRKQL LINELES TE RSSIPITIRQ LEAIIRITES LAKLELSPIA QERHVDEAIR LFQASTMDAA SQDPIGGLNQ ASGTSLSEIR RFEQELKR R LPIGWSTSYQ TLRREFVDTH RFSQLALDKA LYALEKHETI QLRHQGQNIY RSGV

UniProtKB: Minichromosome maintenance protein 5

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Macromolecule #5: DNA replication licensing factor MCM6

MacromoleculeName: DNA replication licensing factor MCM6 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 113.110211 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MSSPFPADTP SSNRPSNSSP PPSSIGAGFG SSSGLDSQIG SRLHFPSSSQ PHVSNSQTGP FVNDSTQFSS QRLQTDGSAT NDMEGNEPA RSFKSRALNH VKKVDDVTGE KVREAFEQFL EDFSVQSTDT GEVEKVYRAQ IEFMKIYDLN TIYIDYQHLS M RENGALAM ...String:
MSSPFPADTP SSNRPSNSSP PPSSIGAGFG SSSGLDSQIG SRLHFPSSSQ PHVSNSQTGP FVNDSTQFSS QRLQTDGSAT NDMEGNEPA RSFKSRALNH VKKVDDVTGE KVREAFEQFL EDFSVQSTDT GEVEKVYRAQ IEFMKIYDLN TIYIDYQHLS M RENGALAM AISEQYYRFL PFLQKGLRRV VRKYAPELLN TSDSLKRSEG DEGQADEDEQ QDDDMNGSSL PRDSGSSAAP GN GTSAMAT RSITTSTSPE QTERVFQISF FNLPTVHRIR DIRSEKIGSL LSISGTVTRT SEVRPELYKA SFTCDMCRAI VDN VEQSFK YTEPTFCPNP SCENRAFWTL NVTRSRFLDW QKVRIQENAN EIPTGSMPRT LDVILRGDSV ERAKPGDRCK FTGV EIVVP DVTQLGLPGV KPSSTLDTRG ISKTTEGLNS GVTGLRSLGV RDLTYKISFL ACHVISIGSN IGASSPDANS NNRET ELQM AANLQANNVY QDNERDQEVF LNSLSSDEIN ELKEMVKDEH IYDKLVRSIA PAVFGHEAVK KGILLQMLGG VHKSTV EGI KLRGDINICV VGDPSTSKSQ FLKYVVGFAP RSVYTSGKAS SAAGLTAAVV RDEEGGDYTI EAGALMLADN GICCIDE FD KMDISDQVAI HEAMEQQTIS IAKAGIHATL NARTSILAAA NPVGGRYNRK LSLRGNLNMT APIMSRFDLF FVILDDCN E KIDTELASHI VDLHMKRDEA IEPPFSAEQL RRYIKYARTF KPILTKEARS YLVEKYKELR KDDAQGFSRS SYRITVRQL ESMIRLSEAI ARANCVDEIT PSFIAEAYDL LRQSIIRVDV DDVEMDEEFD NIESQSHAAS GNNDDNDDGT GSGVITSEPP ADIEEGQSE ATARPGTSEK KKTTVTYDKY VSMMNMIVRK IAEVDREGAE ELTAVDIVDW YLLQKENDLG SLAEYWEERR L AFKVIKRL VKDRILMEIH GTRHNLRDLE NEENENNKTV YVIHPNCEVL DQLEPQDSS

UniProtKB: DNA replication licensing factor MCM6

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Macromolecule #6: DNA replication licensing factor MCM7

MacromoleculeName: DNA replication licensing factor MCM7 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 95.049875 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MSAALPSIQL PVDYNNLFNE ITDFLVTFKQ DTLSSDATRN ENEDENLDAE NIEQHLLEKG PKYMAMLQKV ANRELNSVII DLDDILQYQ NEKFLQGTQA DDLVSAIQQN ANHFTELFCR AIDNNMPLPT KEIDYKDDVL DVILNQRRLR NERMLSDRTN E IRSENLMD ...String:
MSAALPSIQL PVDYNNLFNE ITDFLVTFKQ DTLSSDATRN ENEDENLDAE NIEQHLLEKG PKYMAMLQKV ANRELNSVII DLDDILQYQ NEKFLQGTQA DDLVSAIQQN ANHFTELFCR AIDNNMPLPT KEIDYKDDVL DVILNQRRLR NERMLSDRTN E IRSENLMD TTMDPPSSMN DALREVVEDE TELFPPNLTR RYFLYFKPLS QNCARRYRKK AISSKPLSVR QIKGDFLGQL IT VRGIITR VSDVKPAVEV IAYTCDQCGY EVFQEVNSRT FTPLSECTSE ECSQNQTKGQ LFMSTRASKF SAFQECKIQE LSQ QVPVGH IPRSLNIHVN GTLVRSLSPG DIVDVTGIFL PAPYTGFKAL KAGLLTETYL EAQFVRQHKK KFASFSLTSD VEER VMELI TSGDVYNRLA KSIAPEIYGN LDVKKALLLL LVGGVDKRVG DGMKIRGDIN VCLMGDPGVA KSQLLKAICK ISPRG VYTT GKGSSGVGLT AAVMKDPVTD EMILEGGALV LADNGICCID EFDKMDESDR TAIHEVMEQQ TISISKAGIN TTLNAR TSI LAAANPLYGR YNPRLSPLDN INLPAALLSR FDILFLMLDI PSRDDDEKLA EHVTYVHMHN KQPDLDFTPV EPSKMRE YI AYAKTKRPVM SEAVNDYVVQ AYIRLRQDSK REMDSKFSFG QATPRTLLGI IRLSQALAKL RLADMVDIDD VEEALRLV R VSKESLYQET NKSKEDESPT TKIFTIIKKM LQETGKNTLS YENIVKTVRL RGFTMLQLSN CIQEYSYLNV WHLINEGNT LKFVDDGTMD TDQEDSLVST PKLAPQTTAS ANVSAQDSDI DLQDA

UniProtKB: DNA replication licensing factor MCM7

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Macromolecule #7: DNA (5'-D(P*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP...

MacromoleculeName: DNA (5'-D(P*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*T)-3')
type: dna / ID: 7 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 5.804773 KDa
SequenceString:
(DC)(DA)(DT)(DG)(DC)(DA)(DT)(DG)(DC)(DA) (DT)(DG)(DC)(DA)(DT)(DG)(DC)(DA)(DT)

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Macromolecule #8: DNA (5'-D(P*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*T)-3')

MacromoleculeName: DNA (5'-D(P*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*TP*GP*CP*AP*T)-3')
type: dna / ID: 8 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 5.211398 KDa
SequenceString:
(DA)(DT)(DG)(DC)(DA)(DT)(DG)(DC)(DA)(DT) (DG)(DC)(DA)(DT)(DG)(DC)(DA)

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Macromolecule #9: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 9 / Number of copies: 2 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

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Macromolecule #10: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 10 / Number of copies: 6 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #11: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 11 / Number of copies: 5 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #12: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 12 / Number of copies: 4 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

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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

Concentration0.05 mg/mL
BufferpH: 7.6
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE OXIDE / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 300 sec. / Pretreatment - Atmosphere: AIR
Details: Glow discharge at 40 mA for 5 minutes prior to applying graphene oxide.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV
DetailsComplete biochemical reaction containing the MCM helicase in complex with Cdt1, the helicase loader (the origin recognition complex), the co-factor Cdc6, an origin or replication (DNA) flanked by nucleosomes, the regulatory kinase CDK and an inhibitor of CDK (Sic1). The sample was incubated with ATP yielding a range of structural intermediates in the MCM loading pathway.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 1-40 / Number real images: 24506 / Average electron dose: 51.2 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 4.5 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 130000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 621909
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.41 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1)
Details: Reported resolution obtained from maps after Relion 3D Refinement
Number images used: 396366
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final 3D classificationNumber classes: 3 / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

7p30


Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-8rig:
Cryo-EM structure of an MCM helicase single hexamer loaded onto dsDNA.

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